‘TfTVl (6) 
EPARTMENT TECHNICAL MANUAL 
X-RAY FIELD UNIT, 
FLUOROSCOPIC, FOREIGN 
BODY LOCALIZATION, 
COMPLETE Item 9621500 
WAR DEPARTMENT 
APRIL 1945 IV A R DEPARTMENT TECHNICAL MANUAL 
TM 8-633 
X-RAY FIELD UNIT, 
FLUOROSCOPIC, FOREIGN 
BODY LOCALIZATION, 
COMPLETE Item 9621500 
W AR DEPARTMENT 
APRIL 1945 
United States Government Printing Office 
Washington: 1945 WAR DEPARTMENT 
Washington 25, D. C., 17 April 1945 
TM 8-633, X-ray Field Unit, Fluoroscopic, Foreign Body Localiza- 
tion, Complete, Item 9621500, is published for the information and 
guidance of all concerned. 
* . [AG 300.7 (8 Mar 45)] 
order of the Secretary of War : 
Official: G. C. MARSHALL 
J. A. ULIO Chief of Staff 
Major General 
The Adjutant General 
Distribution ; 
AAF (5); AGF (5); ASF (2); T of Opns (10); Dept (10); 
Base Comds (5) ; S Div ASF (1); CG, SvC (5) ; CG, PE (2) ; 
ASF Dep (Med Sec) (10) ; Dep 8 (Cont) (25) except St Louis 
Med Dep (75) ; Named GH (4) ; Named SH (2) ; Cony Hosp 
(2); USMA (2); A (2); CHQ (2); AF (5); T/O & E 
8-187 (2); 8-510 (2) ; 8-550 (4); 8-560 (2); 8-572S (2); 
8-580 (3); 8-581 (3); 8-590 (2); 8-610 (1); 8-611 (1); 
8-667 (2). 
Refer to FM 21-6 for explanation of distribution formula. 
ii CONTENTS 
Paragraph Page 
PART ONE. INTRODUCTION. 
Section I. General. 
Scope 1 1 
Records 2 2 
II. Description and data. 
Description 3 2 
Data 4 11 
III. Tools and accessories. 
Tools 5 11 
Accessories 6 11 
PART TWO. OPERATING INSTRUCTIONS. 
Section IV. General. 
Scope 7 12 
V. Assembly. 
Unpacking and assembly 8 12 
VI. Controls and instruments. 
Controls 9 38 
Instruments 10 40 
Table controls 11 40 
VII. Operation. 
Fluoroscopy 12 42 
Foreign body localization 13 43 
Radiography 14 46 
VIII. Operation of auxiliary equipment. 
X-ray field unit generator 15 48 
PART THREE. MAINTENANCE INSTRUCTIONS. 
Section IX. General. 
Scope 16 49 
X. Special organizational tools and equipment. 
Tools and equipment 17 49 
XL Lubrication. 
Lubrication 18 49 
XII. Preventive maintenance services. 
Operator maintenance (first echelon) 19 49 
Organizational maintenance (second echelon) 20 50 
Kill. Trouble shooting. 
General 21 50 
Electrical 22 51 
Mechanical 23 53 
III Paragraph Page 
XIV. Maintenance operations. 
General 24 54 
To replace fuses 25 54 
Source of current 26 54 
To set line compensator switch 27 54 
To test contact in receptacles 28 55 
To repair a cable 29 55 
To clean contacts 30 55 
To recenter skin marker 31 55 
To adjust lock pressure 32 56 
To center screen longitudinally 33 56 
To remove play in vertical column 34 56 
To adjust eccentric bearings 35 56 
To adjust brace rods 36 56 
To adjust screen arm lock mechanism 37 56 
PART FOUR. AUXILIARY EQUIPMENT. 
Section XV. X-ray field unit generator 9606000. 
General 38 57 
Installation 39 57 
Exhaust 40 57 
Connecting X-ray unit 41 57 
XVI. Use o£ table with control and tube of field unit 9608500. 
Installation 42 57 
Accessories 43 58 
Capacities 44 58 
Precautions 45 58 
APPENDIX. STORAGE AND SHIPMENT; SPARE PARTS. 5 
INDEX 66 PART ONE 
INTRODUCTION 
Section I. GENERAL 
I. Scope 
a. This manual is published for the information and guidance of the 
personnel to whom this equipment is assigned. It contains information on 
the operation and first and second echelon maintenance of the equipment, 
as well as descriptions of the major units and their function in relation to 
Figure 1. Medical Department item No. 9621500 X-ray field unit, fluoroscopic, 
foreign body localisation, complete. the other components of the equipment. It applies to the following Medical 
Department item, No. 9621500 X-ray field unit, fluoroscopic, foreign body 
localization, complete. (See fig. 1.) These instructions are arranged in 
four parts: Part One—Introduction; Part Two—Operating Instructions; 
Part Three—Maintenance Instructions; Part Four—Auxiliary Equip- 
ment. 
h. For further information refer to the following publications : 
TM 8-240, Roentgenographic Technicians. 
TM 8-280, Military Roentgenology. 
TM 8-630, X-Ray Field Unit Generator, Item 9606000. 
TM 8-632, X-Ray Field Unit, Machine, Chassis and Table, Items 
9608508, 9608S10, 9609005, 9609010, 9614500. 
TB MED 117, Electrical Requirements for X-Ray Apparatus in 
the Field or in Temporary Installations. 
c. Those parts keyed on the illustrations with Medical Department 
numbers and formal nomenclature are regularly supplied as spare parts. 
All requisitions for spare parts should be submitted in accordance with 
latest ASF Supply Catalog MED 7 on this equipment. 
2. Records 
No special maintenance forms or records are required to be kept by the 
using personnel except as may be prescribed by the Medical Officer in 
charge. 
Section II. DESCRIPTION AND DATA 
3. Description 
a. General. The X-ray field unit, fluoroscopic, foreign body localiza- 
tion, which will be referred to in this manual as the Airflow Unit, is 
designed to do horizontal fluoroscopy, horizontal and vertical radiography, 
and foreign body localization with a patient on a litter. Because of the 
probability of transportation by air and its use in advance medical installa- 
tions, some flexibility of use has been sacrificed to make the unit compact 
and portable. Three chests make up the unit and when used in conjunction 
with the X-ray field unit generator, a completely independent installation 
is established. The table assembly can be used with the control, trans- 
former and tube assembly of item No. 9608500. (See figs. 2 and 3.) 3 
Figure 2. Airflow table in use with control, transformer, tube and cables of item 
No. 9608500. (Assembled for fluoroscopy and localisation.) 4 
Figure 3. Aitfloiv table in use with control, transformer, tube and cables of item 
No. 9608500. (Assembled for radiography.) 5 
Figure 4. Table Chest No. 1, Airflow unit. (l) Table Chest No. 1 (fig. 4) contains the following items: 
(a) Four table legs. 
(b) Four table leg cross rails. 
(c) Two sectional separable tie rail. 
(d) One sectional separable tie rail. 
(e) Six rail draw bolts. 
(/) One vertical column assembly. 
(g) One radiographic tubestand. 
(h) One control shelf. 
(i) One control 'shelf support tube. 
(/) One 30-inch focal distance scale. 
(k) One fluoroscopic screen arm. 
(/) One X-ray tube arm. 
(m) One X-ray protective shield. 
(n) Two brace rods. 
(o) One manufacturer’s instruction manual. 
The last three items are packed in the compartment provided. Space has 
also been provided within the compartment for a protective apron, gloves 
and fluoroscopic goggles, if an extra set of these items is furnished. 
(2) Table Chest No. 2 (fig. 5 ®, and (D) contains the following 
items: 
(a) One horizontal carriage assembly. 
(b) One mounted fluoroscopic screen assembly. 
(c) One diaphragm control assembly. 
(d) One daylight fluoroscopic hood. 
(c) One calibration gauge. 
(/) One X-ray protective apron. 
(g) One pair X-ray protective fluoroscopic gloves. 
(h) One pair of fluoroscopic goggles. 
(i) One localizer dial assembly. 
(;’) One 12 x 16-inch fluoroscopic grid. 
(k) One fluoroscopic radiation cone. 
(l) One depth indicator and skin marker. 
(m) One lifting crank. 
(n) One extension cord for use with item No. 9608500. 
(o) One localizer lamp cord. 
(p) Spare parts and tools. 
The last four items are packed in the tool and spare parts compartment on 
the carriage. To reach this compartment it is necessary to slide the cassette 
cray to the left as you face the open chest. 
Caution; Care must be exercised in handling the fluoroscopic grid as it 
is easily warped or broken. 7 
® Complete. 
Figure 5. Table Chest No. 2, Airflow unit. 8 
(D Carriage removed. 
Figure 5. Table Chest No. 2, Airflow unit. @ Shalving screen. 
Figure 5. Table Chest No. 2, Airflozv unit. 10 
Figure 6. Generator chest No. 3, Airflozv unit. II 
(3) Generator Chest No. 3 (fig. 6) contains the following items: 
(a) One shockproof head assembly. 
(b) One control assembly. 
(c) One main line cable. 
(d) One control to head cable. 
(e) One hand timer and cord. 
(/) One push button and cord. 
(g) Three aluminum filters. 
(h) Two lead aperture plates. 
(i) One spare X-ray tube and container. 
(j) Tools and spare parts. 
Caution: The shockproof head and spare tube must be handled with 
extreme care because of its comparatively fragile nature. 
b. Difference in Models. There are no differences in the models of 
the Airflow unit as a whole, but substitution of a footswitch for the fluoro- 
scopic push button and use of item No. 9608500 can be made to establish 
a more permanent installation. (See sec. XVII.) 
4. Data 
a. Capacities. This equipment is designed to operate on 50 to 60 
cycle, 115 or 230 volt current, automatically selecting the proper incom- 
ing line tap for the line voltage present. The maximum ratings are: 
Fluoroscopy: 5 M.A. @ 80 PKV, 10 seconds exposure, 2 seconds 
rest, for an indefinite period. 
Radiography: 15 M.A. @ 80 PKV, 10 seconds exposure, 40 
seconds rest, for an indefinite period. 
Note. For 50-cycle operation, reduce the maximum KV by 10 KV or double the 
rest period between exposures. 
h. Manufacturer. This equipment is manufactured by the Picker 
X-ray Corporation, Waite Manufacturing Division, Inc.,'Cleveland, Ohio. 
Section ill. TOOLS AND ACCESSORIES 
5. Tools 
No special tools are required for the assembly or maintenance of this unit. 
However, to facilitate organizational maintenance certain common tools 
have been included with the unit. 
6. Accessories 
The accessories supplied with this unit consist of a pair of fluoroscopic 
goggles, a pair of lead rubber gloves and a protective lead rubber apron. 
(See fig. 1.) Use of these items should follow best medical practices and 
be established by the medical officer in charge. PART TWO 
OPERATING INSTRUCTIONS 
Section IV. GENERAL 
7. Scope 
Part Two contains information for tbe guidance of the personnel re- 
sponsible for the operation of this equipment. It contains information on 
assembly and operation of the equipment with a description and location of 
the controls and instruments. 
Note. Failure or unsatisfactory performance of equipment will be reported on 
WD AGO Form 468 (Unsatisfactory Equipment Report). If this form is not 
available see TM 38-250. This form will be made out in duplicate by using or 
service organization and forwarded in duplicate through command channels to 
The Surgeon General. 
Section V. ASSEMBLY 
8. Unpacking and Assembly » 
a. Unpacking and assembly for fluoroscopy and localization is shown 
in the following photographs. As an additional aid to assembly, printed 
instructions and color codes on the various members will be found helpful. 
The changes necessary to do radiography are covered in paragraph 14. 
b. Adjustment .should not be necessary as all clearances and settings are 
established by the manufacturer. Should adjustment be necessary after 
considerable use, the necessary information will be found under section 
XIV. 
12 13 
ASSEMBLY PHOTOGRAPHS 
ITEM 96215 IS PACKED IN THREE CHESTS 
CHEST I CONTAINS THE TABLE FRAME 14 
FOR ASSEMBLY REMOVE THE FOUR LEGS 
FROM CHEST AND TUBULAR RAILS 
FROM EACH LEG 
DIRECTIONS STAMPED 
IN WHITE, YELLOW. 
RED OR BUJE 
RAILS ARE PACKED IN LEG 
STAMPED WITH SAME COLOR 15 
LEGS MARKED I AND I A. 2 AND 2A 
ARE JOINED TOGETHER WITH THE 
SMALLEST DIAMETER TUBULAR MEMBERS 
USE HEX HEAD SCREWS FROM TOOL- 
BOX OF CHEST 2 TO FASTEN RAILS NOTICE THE FOLDING ARRANGEMENT 
OF HINGED PLATES 
THE TWO END LEGS ARE NOW 
JOINED BY ASSEMBLY OF THE SIX 17 
COLORS ARE MATCHED 
FOR ASSEMBLY 
TUBULAR SECTIONS AND 
TABLE ENDS ASSEMBLED 
TIE RODS ARE OBTAINED FROM CHEST U| 
TIE RODS ARE OBTAINED FROM CHEST I... 18 
. i-... * .. 
...AND ONE ROD IS INSERTED 
IN END OF EACH TUBULAR MEMBER 
VERTICAL COLUMN IS NEXT 
REMOVED FROM CHEST I... 19 
... AND HORIZONTAL CARRIAGE FROM 
CHEST 2 
CAUTION! LOCK LEVER 
MUST BE UP 
CARRIAGE IS PLACED ON BACK 
RAIL AND VERTICAL COLUMN INSTALLED- 20 
...AND COLUMN IS RAISED WITH 
CRANK OBTAINED FROM TOOL BOX 
I ' I I ml 
LOCK LEVER CONTROLS THE 
CROSS TRAVEL OF THE CARRIAGE 21 
CONTROL SUPPORT TUBE', 
FROM CHEST-1 
CONTROL SHELF 
FROM CHEST-1 
SPARE TUBE BOX 
FROM CHEST-3 
, 
CONTROL SUPPORT... 
... is ASSEMBLED TO TABLE LEG 22 
CONTROL IS OBTAINED FROM CHEST 3... 
...AND HOOKED ON TO SUPPORT 23 
BY LOOSENING THUMB SCREW REMOVE 
LOCALIZER DIAL FROM CHEST 2... 
...AND HANG ON BRACKET 
OF HORIZONTAL CARRIAGE 24 
...SWING INTO POSITION AND LOCK 
BASIC TABLE IS NOW ASSEMBLED 25 
TUBE ARM 
SCREEN ARM 
REMOVE TUBE ARM AND 
SCREEN ARM FROM CHEST 1 
PLACE TUBE ARM ON LOWER 
END OF VERTICAL COLUMN ... 26 
... AND LOCK SCREEN ARM ON 
UPPER END OF VERTICAL COLUMN 
BRACE RODS FROM CHEST I ARE 
FASTENED TO UNDERSIDE OF CARRIAGE 27 
BUCKLE 
UNBUCKLE AND REMOVE 
SHOCKPROOF HEAD FROM CHEST 3... 
TIGHTEN 
CLAMP 
...AND INSTALL ON TUBE ARM 28 
CONTROLS 
DIAPHRAGM 
DIAPHRAGM ASSEMBLY SS 
REMOVED FROM CHEST 2 
ASSEMBLE DIAPHRAGM ON 
SHOCKPROOF HEAD-CONTROLS 
ON SCREEN ARM 29 
DAMPENER 
CONE 
CONE (FROM CHEST 2) AND DAMPENER 
INSTALLED ON SHOCKPROOF HEAD 
FLUOROSCOPIC SCREEN FROM 
CHEST 2 IS ASSEMBLED TO SCREEN ARM 30 
NOTE PIN 
DEPTH GAUGE AND SKIN MARKER IS 
INSERTED INTO SCREEN FRAME... 
...ROTATE TO ENGAGE PIN 
AND SCREW TIGHT 31 
WHEN NOT IK UCE, FOOAt: SCREEN GAUGE 
FROM CHEST 2 IS HUNG ON END RAIL 
RACK 
RADIOGRAPHIC TUBESTAND 
FROM CHEST 2 IS STORED 
IN RACKS PROVIDED 32 
SHOCKPROOF 
HEAD CONTROL 
CONNECTING 
CABLE 
TIMER 
CABLE 
MAIN UNE CABLE 
LOCALIZER 
CORD 
PUSH BUTTON 
CABLE 
NECESSARY ELECTRICAL CONNECTIONS 
ARE FOUND IN CHEST 3 
SOCKET OF PUSH BUTTON CABLE IS 
DROPPED THROUGH VERTICAL COLUMN... 33 
AND CONNECTED TO SHOCKPROOF HEAD 
ALSO DROP SINGLE END OF 
LOCALIZER CORD THROUGH 
VERTICAL COLUMN... I SKIN DEPTH 
I MARKER 
LOCALIZER 
INDICATOR 
SHOCKPROOF 
HEAD 
...AND CONNECT THE THREE ENDS 
SHOCKPROOF HEAD CABLE 
IS INSERTED INTO CONTROL.., 35 
AND OPPOSITE END INTO 
RECEPTACLE OF SHOCKPROOF HEAD 
MAIN LINE CABLE IS CONNECTED 
TO CONTROL 36 
TIMER PLUG IS CONNECTED 
TO RIGHT SIDE OF CONTROL 
X-RAY PROTECTIVE SHIELD FROM 
CHEST I IS ATTACHED-PROTECTIVE 
APRON AND GLOVES ARE 
FOUND IN CHEST 2 37 
FILTERS FROM CHEST 3 ARE 
STORED IN COMPARTMENT. 38 
Section VI. CONTROLS AND INSTRUMENTS 
9. Controls 
a. Main Switch “A” (fig-. 7 (11)). Located in the center of the 
1. Line compensator switch. 
2. Check filament switch. 
3. Kilovolt selector switch knob 
4. Kilovolt meter. 
5. Milliammeter. 
6. Breaker indicator lamp. 
7. Filament control switch knob 
8. Radiographic-fluoroscopic 
safety switch. 
9. Thumbscrew for retaining 
tubehead. 
10. Lock handle. 
I I. Main switch. 
12. Breaker reset switch. 
Figure 7. Control and head assemblies, Airflow unit. 
switch panel, the main switch serves the purpose of energizing the unit, 
selecting a high or low kilovolt range and when moved to the OFF posi- 
tion and returned to its previous position, will cause the circuit breaker 
to reset. Although the main switch is not normally used to reset the' cir- 
cuit breaker, it is well to note this possibility in case of damage to reset 
switch, or when attempting to locate trouble. 
(1) Both sides of the power supply are broken by the main switch and 
upon closing it the voltmeter should indicate, and all pilot lights light. 
(2) In the HIGH position, the maximum kilovoltage is slightly above 
80 kilovolts and in the LOW position, the lowest kilovoltage is approxi- 
mately 40 kilovolts. Thus, in combination with kilovolt selector switch 
(fig. 7 (3)), a range of from 40 to 80 kilovolts in approximately 2 kilo- 
volt steps is available. 39 
h. Radiographic-Fluoroscopic Safety Switch “B” (fig. 7 (8)). 
This double switch is located in the switch panel on the right-hand side 
and serves the following functions: 
(1) It changes the control of the main contactor from the push button 
to the timer when the switch is changed from fluoroscopy to radiography. 
(A footswitch may be substitued for the push button since an identical 
plug is used on both accessories.) 
(2) It changes the calibration of the circuit breaker to fluoroscopic 
or radiographic limits. 
(3) It controls the illumination of the meters from dim on fluoroscopy 
to bright on radiography. 
c. Kilovolt Selector Knob “C” (fig. 7 (3)). Location of this 
knob is in the lower left-hand corner, and provides for 11 steps of kilovolt- 
tage adjustment of about 2 kilovolts each. This selector in combination 
with the main switch provides a range of from 40 to 80 kilovolts in ap- 
proximately 2 kilovolt steps. 
d. Check Filament Switch “E” (fig. 7 (2)). This switch is the 
left hand one of the pair of switches located in the lower left-hand corner 
of the switch panel. With this switch in its normal position, the kilovolt- 
meter scale is read. When it is depressed and held to the preset filament 
position, the upper scale “F” of the kilovoltmeter is read. 
e. Filament Control Knob “G” (fig. 7 (7)). In the lower right- 
hand corner of the name plate is the filament control knob which permits 
adjustment of the milliamperage to any value up to 15 MA. It will be 
found that the adjustment is spread over approximately 250° of rotation 
of the control knob, thus providing a fine degree of regulation of milliam- 
perage. 
f. Breaker Reset Switch “H” (fig. 7 (12)). This switch is the right 
hand one of the pair of switches located in the lower left-hand corner of 
the switch panel. When the circuit breaker is opened by an overload, this 
switch is used to reset it, and permits resumption of operation after the 
cause of the overload has been eliminated. Also, see a above. 
g. Push Button (sec. V). The push button is located in the top of 
the vertical tubular member and is packed in Chest No. 3 for shipment. 
It is used during fluoroscopy and localization instead of a footswitch, 
facilitating operation because of its location, and eliminating the necessity 
of a footswitch which may be objectionable on soft or bumpy ground. 
h. Hand Timer (sec. V). The hand timer is suspended from the con- 
trol and is packed in Chest No. 3 during shipment. It is used for radiog- 
raphy and has a time range of 1/10 second to 12 seconds. Exposure is 
made by depressing the button after selecting the desired time period. 
i. Line Compensator Switch (fig. 7 (1)). The compensator is lo- 
cated in the lower left-hand side of the control. This switch permits the 40 
adjustment of the control to various line voltages, in order to maintain the 
accuracy of the filament control. (See par. 26.) 
10. Instruments 
a. Kilovolt Meter “D” (fig. 7 (4)). This meter located in the up- 
per left-hand corner of the control serves a dual purpose, lower scale “D" 
indicating the kilovoltage applied to the X-ray tube and upper scale “F” 
indicating, when the check filament switch is depressed, the filament set- 
ting. 
(1) Under operating conditions, that is, with filament check switch not 
depressed and an exposure being made, this meter shows the kilovoltage 
which is being applied across the tube during exposure. 
Note. If a presetting of this meter is desired, it will be necessary to determine 
what drop in meter reading is developed for each setting of milliamperage used. 
Each different service outlet or source of power will require individual calibration. 
(2) Upper scale “F” of this meter is read when the check filament 
switch is depressed. The use of this position is given in paragraph 9d. 
b. Milliammeter “J” (fig. 7 (5)). This meter is located in the upper 
right-hand corner of the control and indicates the current passing through 
the X-ray tube during exposure. It should be noted that part of the scale 
is printed in red, indicating the operation is in the danger zone and the 
milliamperage should be lowered by adjusting the filament control counter- 
clockwise. 
c. Circuit Breaker and Breaker Indicator. If the safe limits of 
either radiographic or fluoroscopic operations are exceeded, the circuit 
breaker opens, the breaker indicator lamp (fig. 7 (6)) goes out, and fur- 
ther operation is suspended until the source of trouble is corrected. To 
reset the circuit breaker, the breaker reset switch is depressed as explained 
in paragraph 9f. 
I I. Table Controls 
a. Shutter Control (fig. 8 (1)). Remote control of the shutters is 
accomplished by means of two levers mounted on the horizontal screen 
arm. These levers by means of a flexible cable operate the shutter as- 
sembly, which in turn governs the size of the fluoroscopic field on the 
screen. 
b. Depth Indicator and Skin Marker (fig. 8 (2)). By means of 
this assembly, located on the screen frame, the distance of the screen from 
the patient’s skin is measured. A pad is included which, when saturated 
with a colored fluid, marks the point on the patient’s skin at which the 
measurement was taken. 
c. \ ertical Column Crank (fig. 8 (8)). Located on the operator’s 41 
1. Shutter control levers. 
2. Depth indicator and skin marker. 
3. Thumbscrew for adjusting screen 
to tube distance. 
4. Localizer dial. 
5. Longitudinal travel lock lever 
6. Cross travel lock lever. 
7. Vertical travel limiting lever. 
8. Vertical column crank. 
Figure 8. Table controls, Airflow unit. 
side of the table on the carriage assembly, this crank is used to raise and 
lower the screen and tube head simultaneously. 
d. Localizer Dial (fig. 8 (4)). The dial assembly is located on the 
operator’s side of the carriage and is used in the process of calculating the 
depth of a foreign body. 
e. Locking Levers. There are three main locking levers used during 
operation. 
(1) Lever (fig. 8 (5)), used to lock the carriage against longitudinal 
travel. 42 
(2) Lever (fig. 8 (6)), used to lock the carriage against cross travel. 
(3) Lever (fig. 9 (9)), used to lock the fluoroscopic screen against 
horizontal rotation about the vertical column. 
1. Vertical column. 
2. Localizer lock. 
3. Vertical scale of skin marker. 
4. Daylight hood. 
5. Support pins for use in checking 
screen to tube distance. 
6. Support pins for use in checking 
skin to screen distance. 
7. Depth gauge and adjusting nut, 
8. Calibration gauge. 
9. Horizontal rotation lock lever. 
10. Drive knob. 
I I. Dial knob. 
12. Localizer dial. 
13. Movable pointer. 
Figure 9. Airflow unit, assembled for localisation and fluoroscopy. 
Section VII. OPERATION 
12. Fluoroscopy 
Upon completing the assembly and before operating the equipment, read 
section VI. For localization and fluoroscopy see figure 9. For fluoroscopy 
proceed as follows: Alphabetical sequence is followed as shown by the 
letters on the controls and instruments. 43 
b. Set radiographic-fluoroscopic safety switch “B” on FLUORO 
SCOPY. 
a. Set main switch “A” on MAIN HIGH. 
c. Adjust kilovolt selector knob “C” to desired kilovoltage which will 
be indicated on kilovolt meter scale “D.” 
d. Depress check filament switch “E” and hold while filament control 
knob “G” is adjusted to approximate reading as indicated on filament 
scale “F.” 
e. Depress push button and read milliamperage on milliampere scale 
“J,” readjusting knob “G” if correction is necessary. 
/. While push button is still depressed read kilovoltage on scale “D.” 
If desired kilovoltage is not registering, release push button and adjust 
by knob “C.” Again depress push button and recheck kilovoltage. 
g. If 7 milliamperes on fluoroscopy is exceeded, the circuit breaker will 
open the circuit, and breaker indicator lamp will go out. If this occurs, 
reduce milliamperage by turning knob “G” to the left and depress breaker 
reset switch “H” to reset breaker. 
13. Foreign Body Localization 
a. General. To prevent errors in calculation and reduce the tendency 
of developing play, looseness, or wear of the parts, observe the following 
precautions and methods of handling. 
(1) It is highly important that the depth gauge (fig. 9 (7)) is treated 
in a careful manner to prevent bending and errors in calculation. 
(2) It is recommended that when moving the screen, pressure be 
applied to the vertical column (fig. 9(1)) rather than to the screen itself. 
This will reduce the tendency of developing looseness or play in the screen 
mechanism. 
(3) Proper positioning of levers and controls will assure accuracy and 
prevent damage to the equipment. For example, during fluoroscopy, in 
order to prevent the shockproof head from being cranked down until it 
strikes the ground, the vertical travel limiting lever (fig. 8 (7)) must be 
in the position marked FLUOROSCOPY. 
(4) The cranking mechanism and carriage travel should operate 
smoothly and should not be forced. Check position of locks and lifting 
mechanism if undue force is needed to raise or lower the assembly. 
(5) Proper adjustment of all locking mechanisms to hold the assembly 
against accidental movement will prevent errors in calculation. 
b. Alignment of Tube. Before calibrating the localization device, the 
screen and tube must be centered with respect to each other. 
(1) Close the shutter aperture down to about a j/2-inch square. 
(2) Adjust the screen so that it is parallel to the table top. 
(3) Operate the unit fluoroscopically and observe the illumination on the screen. If the tube and screen are centered with respect to each other 
the center intersecting lines will be in the illuminated portion of the 
screen, and the point of the intersection of the lines an equal distance 
from all sides of the square. 
44 
(4) If the alignment is not correct, the head must be rotated slightly 
on its mounting hanger by releasing the lock handle (fig. 7 (10)), or 
about the tube arm by releasing thumbscrew (fig. 7 (9)), until the screen 
and tube are properly centered. Securely lock both the lever and thumb- 
screw. (See par. 33.) 
c. Calibration. Calibration of the localizing device when setting up 
the equipment, and from time to time during use, is necessary in order to 
insure accurate results. To accomplish this, the calibration gauge (fig. 9 
(8)) is supplied with the unit, and the checking is done with the daylight 
hood (fig. 9 (4)) installed. If the calibration is done in a darkroom with 
the daylight hood removed, allowance for the thickness of the hood frame 
must be made by inserting a coin, or equal thickness of paper, under each 
of the pins of the calibration gauge. 
(1) Suspend the gauge from the fluoroscopic screen frame, as shown, 
by the two pins (fig. 9 (5)), nearest the open end. Note that the closed 
end of the gauge has two holes in it, each carrying a cross hair, and that 
the fluoroscopic screen has three cross lines affixed to the glass. These 
lines on the screen can be seen when the hood is removed, or during 
operation when fluoroscopy is being done. 
(2) Operate the unit fluoroscopically with the diaphragm closed down 
slightly, in order to be certain not to ray over the edge of the screen, yet 
have the field sufficiently large to permit visualization of the two outside 
lines on the screen. 
(3) Move the gauge one way or the other until the shadow from one 
of the cross hairs casts its image directly on one of the lines on the screen. 
Note whether the image of the second cross hair is directly on the other 
extreme line of the screen. If it is not in direct register, it indicates that 
the screen is either too close or too far from the focal point of the tube. 
(4) To adjust for proper screen to tube distance the thumbscrews 
(fig. 8 (3)) and the one directly below it on the underside of the arm, 
are turned at the same time in opposing directions, until both cross hair 
shadows are in direct register with the two outside lines on the screen. 
After this has been accomplished, tighten the thumbscrews in order to 
prevent losing the adjustment. The proper tube to screen distance, 66 cm. 
exactly, has been established. After tightening recheck alignment. 
(5) Remove the calibration gauge and suspend it this time from the 
two pins (fig. 9 (6)), farthest from the open end. This is done to check 
the skin to screen distance. 
(6) Swing the depth gauge and skin marker under the screen so that 
it is positioned in the approximate center of the screen. Now lower it 45 
until its rests on the calibration gauge, allowing the full weight to rest on 
the cross member. 
(7) If properly adjusted, the vertical scale of the skin marker (fig. 9 
(3 ) ), as read against the cross wire in the center of the window, should 
lead 14.7 cm. If it does not read 14.7 cm. adjustment to the proper dis- 
tance is made by loosening the lock nut (fig. 9 (7)), and raising or lower- 
ing the marker until the reading is exactly 14.7 cm. Tighten the lock nut 
and recheck. 
d. Localization Procedure. In order to localize a foreign body, 
operate as for fluoroscopy and proceed as follows (fig. 9) : 
(1) Lock the fluoroscopic screen against horizontal rotation about the 
vertical column by means of the locking lever and against rotation about 
its own axis by localizer lock. (See fig. 9 (2).) 
(2) With the patient on the stretcher, adjust the vertical column by 
moving the crank up or down until there is approximately 3 inches be- 
tween the underside of the screen and the patient. With this clearance 
sufficient room will be had for the free use of the skin marker. 
(3) Align the; foreign body, when viewed on the fluoroscopic screen, 
to the center intersecting lines on the screen by moving the carriage cross 
the lengthwise to the table. Lock the movement of the carriage. 
(4) Rotate the skin marker so that it too lies directly under the center 
intersecting lines on the screen, then lower it gently until it just touches 
the patient’s skin. This will mark the skin directly above the object in the 
patient’s body. 
(5) Read the skin screen distance from the scale of the skin marker. 
Raise marker and rotate out of field. Adjust the movable pointer (fig. 9 
(13)) to this corresponding depth on the red side of the dial (fig. 9 
(12).) 
(6) Unlock the lengthwise motion of the screen keeping the crosswise 
motion locked, and by means of the knob (fig. 9 (10)) drive the carriage 
until the image of the foreign body coincides with the line at the red side 
of the screen. Care must be exercised not to shift the pointer once the 
depth is recorded as in (5) above. 
(7) Relock against lengthwise motion and by means of knob (fig. 9 
(11)) rotate the dial until the pointer, which will move at the same time, 
coincides with the stationary pointer on the housing. By this operation 
the skin-screen distance is automatically subtracted from the screen for- 
eign body distance. 
(8) Release the longitudinal travel lock and drive the carriage in the 
opposite direction until the image of the foreign body coincides with the 
line on the opposite side of the screen. 
(9) Relock the carriage and the depth of the foreign body below the 
mark on the patient’s skin can be read directly on the black side of the 
dial as indicated by the stationary pointer. 46 
14. Radiography 
a. If it is desired to do radiographic work, the following changes must 
be made: 
(1) Remove the daylight fluoroscopic hood and store by hooks on rail 
at end of table as shown in (fig. 10 (8)). 
1. Grid. 
2. Position of head for vertical 
radiography. 
3. Radiographic tubestand. 
4. Extended tube arm. 
5. Position of head for horizontal 
radiography. 
6. Vertical column. 
7. Cassette tray. 
8. Hood in storage position. 
9. Ratchet levers. 
10. Hangers for protective shield. 
Figure 10. Airflow unit—assembled for radiography. 47 
(3) Remove the cord used for the illumination of the screen-skin depth 
gauge and the push button from the top of the vertical column. Store 
them in a place where they will not be lost or damaged. 
(2) Swing fluoroscopic screen to side as shown in figure 10. 
(4) Take the radiographic tube stand (fig. 10 (3)) from its hanger 
and attach to the upper part of the vertical column (fig. 10 (6)). When 
so doing, it should be turned so that it indexes with the slots in the verti- 
cal column in such a way that the extended tube arm (fig. 10 (4)) points 
to the center of the table. 
(5) When removing the shockproof head, the diaphragm and X-ray 
protective shield must also be removed. In order to make it unnecessary 
to remove the shield completely, two fittings (fig. 10 (10)) are provided 
on the horizontal carriage frame, and it can be hung there as shown. The 
diaphragm shutter housing can be hung on the brace rods that stiffen the 
carriage. 
(6) By reversing the procedure followed during assembly, the shock- 
proof head can be removed from the undertable position. 
Note. The vertical travel stop must be turned to the radiographic position to 
permit lowering the assembly for removal. 
(7) Install the shockproof head on its arm at the top of tubestand. 
It will be noted that there are two positions (fig. 10 (2) and (5)) on 
the radiographic tubestand into which the head can be mounted, as indi- 
cated in the instruction label, one for horizontal radiography and one for 
vertical radiography. If the arm (fig. 10 (5)) is placed in the correct 
position, it will permit crosswise travel and equidistance from the center 
of the table. 
(8) By means of the crank the head can be raised or lowered for all 
normal radiographic distances. By turning the head and tubestand 180°, 
a distance of approximately 6 feet from a litter placed on the ground is 
obtained. When this is done, care must be exercised that the overhanging 
weight of the head does not accidently tip the table. 
(9) For horizontal radiography the cassette should be placed upon the 
tray (fig. 10 (7)) and centered with the target of the tube. 
Note. The target in the shockproof head is approximately 1% inches off center 
ot the arm. (See fig. 10(5).) By grasping the side of the frame and raising or 
lowering it, the cassette can be brought as close to the patient as desired, and 
will be held there by the ratchet levers. (See fig. 10(9).) To lower the tray both 
ratchet levers must be released. 
(10) In order to bring the tube into position for vertical chest radiog- 
raphy, it must be installed on arm (fig. 10 (2)) and rotated 90° to the 
right or left about its axis. Therefore, by having the patient stand at 
either end of the table, the focal distance can be altered by shifting the 
carriage mechanism lengthwise on the table. (11) When it is desired to use the grid (fig. 10 (1)) it is removed 
from the screen holder and placed upon the cassette. Always store the 
grid, when not in use, with the screen. 
(12) When the head is used over the table, the radiation cone can be 
installed if desired. When not in use, the cone is stored on the carriage. 
b. Presetting for any desired exposure factors are made as follows; 
Alphabetical sequence is followed as shown by the letters on the controls 
and instruments. (See sec. VI.) 
(1) Set main switch “A” on either HIGH or LOW, depending upon 
kilovoltage range desired. 
(2) Set radiographic-fluoroscopic safety switch “B” on RADIOG- 
RAPHY. 
(3) Adjust kilovolt selector knob “C” to approximate kilovoltage as 
indicated on kilovolt meter “D.” 
(4) Depress check filament switch “E” and hold while filament con- 
trol knob “G” is adjusted to give approximate readings on filament 
scale “F.” Release switch. 
(5) Depress timer button and read millamperage on milliampere scale 
“J,” readjusting knob “G” if correction is necessary. 
(6) With the timer button depressed read kilovoltage on scale “D.” 
If desired kilovoltage is not obtained, release timer button and adjust by 
knob “C.” Depress timer button and recheck kilovoltage. 
(7) If 15 milliamperes on radiography is exceeded, the circuit breaker 
will open circuit and breaker indicator lamp will go out. If this occurs, 
reduce milliamperage by turning knob “G” to the left and depress breaker 
reset switch “H” to reset. 
(8) In order to prolong tube life and to speed up operation, the settings 
obtained can be tabulated and kept for future reference. It should be 
noted, however, that these readings will hold true only for each service 
outlet or source of power. 
Section VIII. OPERATION OF AUXILIARY EQUIPMENT 
15. X-Ray Field Unit Generator 
For operation of the X-ray field unit generator see TM 8-630. PART THREE 
MAINTENANCE INSTRUCTIONS 
Section IX. GENERAL 
16. Scope 
Part Three contains information for the guidance of the personnel of the 
using organizations responsible for the maintenance (first and second 
echelon) of this equipment. It contains maintenance information as well 
as a tabulation of possible service problems and their correction. It is well 
to note that no two service problems are identical and individual re- 
sourcefulness and thinking will simplify many problems. 
Section X. SPECIAL ORGANIZATIONAL TOOLS 
AND EQUIPMENT 
17. Tools and Equipment 
There are no special tools or equipment required for the maintenance of 
this equipment. 
Section XI. LUBRICATION 
18. Lubrication 
Lubrication of this equipment is not required. Care should be exercised 
to prevent oil from getting on any rubber parts or the rubber covered 
cables. 
Section XII. PREVENTIVE MAINTENANCE SERVICES 
19. Operator Maintenance (First Echelon) 
a. Before Operation. (1) Clean and dust off all parts being particu- 
larly careful to remove particles from bearing surfaces and gear rack. 
(2) Check to see that all accessories are available for immediate use and 
that protective screen is properly affixed. 50 
(3) Operate the unit fluoroscopically to determine if it is functioning 
properly and that all cable connections are secure. 
b. During Operation. (1) Occasionally during fluoroscopy observe 
the visual signal button on the tube head to determine whether the safe 
heat limits of the tube are being exceeded. When the red band on the 
button becomes visible it indicates that the total heat capacity of the tube 
is being approached, and operation should be discontinued until the head 
has cooled down. 
(2) From time to time observe the meter settings to permit compensa- 
tion for minor fluctuations and to determine that maximum ratings are 
not exceeded. 
c. After Operation. (1) Remove any foreign matter which may 
have fallen on the equipment during use. 
(2) Return all accessories to their proper places so that the unit will 
be ready for immediate use. 
(3) Be sure main switch is returned to the OFF position 
20. Organizational Maintenance (Second Echelon) 
a. General. From time to time operational difficulties may be encoun- 
tered and can as a general rule be corrected by the using organization. 
By proper handling and occasional checking much trouble can be avoided. 
b. Monthly. The maintenance schedule depends primarily upon the 
location and frequency of use and should be determined by the officer in 
charge. The following services are set up on a monthly basis assuming 
that the equipment has been in daily use. 
(1) Thorough cleaning to remove accumulated dust and dirt from 
the less accessible parts. 
(2) Wipe off all unpainted parts with oil, lubricating, to prevent rust 
formation. 
(4) Calibrate the depth indicator and associated parts of the localizer 
mechanism. 
(3) Check the action of all locks for proper operation. 
(5) Examine the protective devices and daylight hood for holes, 
cracking or damage. 
(6) Check all moving parts and adjustments for proper freedom of 
motion and clearance. 
(7) Tighten all accessible parts to lessen the possibility of developing 
play. 
Section XIII. TROUBLE SHOOTING 
21. General 
The following listed possible troubles and remedies will assist in deter- 51 
mining the cause of unsatisfactory operation. If the remedy is not given, 
reference is made to a paragraph where complete information will be 
found. Only those causes which can be detected during operation or 
during first and second echelon maintenance service are listed. There- 
fore, if the trouble still exists after performing the listed remedies, the 
unit requires higher echelon service. 
22. Electrical 
A gross examination of the more obvious places where trouble may 
occur will in many instances rapidly locate the cause and eliminate 
further checking. For example, if the unit fails to produce X-rays, 
both the milliammeter and voltmeter indicate the passage of current, it 
is possible that the lead diaphragm is in the closed position. 
a. Fuses in supply line blow out. 
Possible cause 
(1) Improper fuse capacity. 
(2) Improper supply line 
values. 
(3) Line compensator 
switch not set cor- 
rectly. 
Possible remedy 
(1) Replace fuse with one of cor- 
rect capacity. (See par. 25.) 
(2) Use power line of correct 
voltage and frequency. (See 
par. 26.) 
(3) Reset compensator switch. 
(See par, 27.) 
b. Voltmeter does not indicate 
Possible cause 
(1) Line cable not plugged 
in. 
(2) Line cable plug not 
making contact in 
receptacle. 
(3) No voltage at source. 
(4) Blown fuse. 
(5) Break in continuity of 
line cable conduc- 
tors. 
(6) Voltage selector switch 
on a dead button. 
(7) Main switch not in 
ON position. 
(8) Voltmeter circuit open. 
Possible remedy 
(1) Plug in line cable. 
(2) Test contact. (See par. 28.) 
(3) Report to proper authority. 
(4) Replace fuse. (See par. 25.) 
(5) Repair or replace cable. (See 
par. 29.) 
(6) Turn selector knob to right 
or left. 
(7) Set switch in ON position.' 
r 
(8) Refer to higher echelon. c. Milliammeter does not indicate. 
Possible came 
(1) X-ray filament not 
energized. 
(2) Insufficient filament 
heat. 
(3) Break in continuity of 
head cable. 
(4) Timer or push button 
not connected. 
(5) Control to head cable 
loosely inserted. 
(6) Radiographic - fluoro- 
scopic safety switch 
set on RADIOG- 
RAPHY and push 
button being de- 
pressed. 
(7) Radiographic - fluoro- 
scopic safety switch 
set on FLUORO- 
SCOPY and timer 
button being de- 
pressed. 
(8) Tube head overheated. 
(9) Circuit breaker open. 
(10) Meter damaged. 
Possible remedy 
(1) Refer to higher echelon. 
(2) Increase filament current. 
(3) Repair or replace cable. 
(See par. 29.) 
(4) Connect timer or push but- 
ton. 
(5) Check cable insertion. 
(6) Set radiographic - fluoro- 
scopic switch on 
FLUOROSCOPY. 
(7) Set radiographic - fluoro- 
scopic safety switch on 
RADIOGRAPPTY. 
(8) Cease operation until tube 
head cools off. 
(9) Reset circuit breaker. 
(10) Refer to higher echelon. 
d. Milliammeter indicates but X-rays are not produced. 
Possible cause 
(1) Tube head off center. 
(2) Diaphragm shutters in 
closed position. 
(3) Full scale deflection 
and no filament con- 
trol. 
Possible remedy 
(1) Center tube head. (See par. 
136.) 
(2) Open diaphragm. 
(3) Refer to higher echelon. 
e. Milliammeter indicates but fluctuates. 
Possible came 
(1) Defective X-ray tube. 
(2) Loose connection in 
tube head. 
(3) Line voltage fluctuates. 
Possible remedy 
(1) Refer to higher echelon. 
(2) Refer to higher echelon. 
(3) Report to proper authority. 53 
f. Circuit breaker trips constantly. 
Possible cause 
Possible remedy 
(1) Defective X-ray tube. 
(2) Defective transformer. 
(3) Safe limits of tube be- 
ing exceeded. 
(4) Circuit breaker incor- 
rectly set. 
g. PIand timer not operating. 
Possible cause 
(1) Not plugged in. 
(2) Time mechanism dam- 
aged. 
(3) Corroded contacts. 
(4) Break in continuity of 
cord. 
//. Push button not operating 
Possible cause 
(1) Not plugged in. 
(2) Corroded contacts. 
(3) Break in continuity of 
cord. 
(1) Refer to higher echelon. 
(2) Refer to higher echelon. 
(3) Decrease exposure factors. 
(4) Refer to higher echelon. 
Possible remedy 
(1) Plug in. 
(2) Refer to higher echelon. 
(3) Clean contacts. (Seepar. 30.) 
(4) Repair or replace cord. 
(1) Plug in. 
(2) Clean contacts. (Seepar. 30.) 
(3) Repair or replace cord. 
Possible remedy 
23. Mechanical 
Mechanical troubles are generally caused by improper care in handling 
and can be lessened by strict adherence to all instructions. 
a. Inaccuracy in localization of a foreign body. 
Possible cause 
(1) Skin to screen distance 
inaccurate. 
(2) Focal spot to screen 
distance inaccurate. 
(3) Skin marker off center. 
(4) Lock not holding. 
(5) Skin marker arm bent. 
(6) Screen out of longi- 
tundinal alignment. 
(7) Screen to tube dis- 
tance inaccurate. 
Possible remedy 
(1) Recalibrate localizer. (See 
par. 13d.) 
(2) Recalibrate localizer. (See 
par. 13d. 
(3) Recenter skin marker. (See 
par. 31.) 
(4) Adjust lock pressure. (See 
par. 32.) 
(5) Straighten or replace and 
then recalibrate localizer. 
(See par. 13d.) 
(6) Realign screen. (See par. 
33.) 
(7) Recalibrate localizer. (See 
par. 13d.) 54 
h. Excessive vibration, looseness, or binding. 
Possible came 
(1) Table assembly loose. 
(2) Play in vertical col- 
umn. 
(3) Carriage assembly 
loose on rails. 
(4) Carriage assembly 
. binds. 
(5) Excessive vibration in 
head. 
(6) Faulty operation of 
screen arm lock 
mechanism. 
Possible remedy 
(1) Tighten all screws. 
(2) Adjust tension on friction 
screws. (See par. 34.) 
(3) Adjust eccentric bearings. 
(See par. 35.) 
(4) Adjust brace rods. (See par. 
36.) 
(5) Check vibration dampener. 
V 
(6) Adjust lock mechanism. (See 
par. 37.) 
Section XIV. MAINTENANCE OPERATIONS 
24. General 
Maintenance operations as outlined in this section are a basis for 
correcting operational difficulties and include the procedures for making 
adjustments. Unusual conditions under which the unit may be operated 
will create new problems calling for individual resourcefulness. 
25. To Replace Fuses 
The proper fuse is approximately determined by the capacity of the unit 
on a basis of 1-ampere capacity of the fuse for each milliampere out- 
put of the machine. On this basis the fuses should be at least 15-ampere 
capacity for 15-milliampere work. It should be remembered however, 
that some lines will not carry that much of a load and to continue opera- 
tion it may be necessary to reduce the exposure factors to conform with 
the existing line conditions. Reduce the milliamperage, if necessary, to 
conform to the existing line condition using the basis as mentioned above. 
26. Source of Current 
Check source of current to be sure that the supply in 50-60 cycles, and 
100-130 or 200—400 volts; be certain that supply is not D-C. Check 
with proper authority. 
27. To Set Line Compensator Switch 
If the line is not exactly 115 or exactly 230 volts, the range of the fila- 
ment control will be affected and the calibration of the device will not be 
accurate. To permit compensation for various line conditions the line 55 
compensator switch is provided. To operate this switch proceed as 
follows: 
a. Red dots are provided on the control and in compensating it is 
necessary to position the knobs or switches in respect to them. 
b. Turn the minor kilovoltage selector to the red dot to button No. 3. 
c. Set the radiographic-fluoroscopic safety switch to the red dot or 
RADIOGRAPHY position. 
d. Set the main switch to the red dot or HIGH side. 
e. Adjust the line compensator switch clockwise or counterclockwise, 
so that the pointer on the kilovoltmeter is made to coincide with the 
red line on the scale. The unit is then ready for operation. 
28. To Test Contact in Receptacles 
Receptacles that have become worn will not make proper contact with 
plugs and are frequently the cause of intermittent or complete cessation 
of operation. By twisting the plug in the receptacle and observing the 
action of the voltmeter, with the main switch on, such a condition is 
readily determined. Replacing the receptacle will eliminate the trouble. 
29. To Repair a Cable 
Damage is most likely to occur at or near the point of connection of the 
cable to the plug and necessitates cutting off the damaged portion and 
replacing the plug. Care must be exercised to follow coding on the 
wires and to connect them properly on polarized plugs and to replace 
insulating barriers. Damage along the length of a cable can be deter- 
mined by flexing the cable along its length and noting whether or not 
contact of the broken ends momentarily energizes the equipment. A 
temporary repair can be made by splicing, but the cable should be replaced. 
30. To Clean Contacts 
Contacts can be reconditioned by cleaning with a piece of fine sandpaper. 
Note. Do not use emery cloth. 
31. To Recenter Skin Marker 
Operate the unit fluoroscopically and proceed as follows 
a. If the pad rotates too far or not far enough before striking the stop, 
loosen the setscrew located near the lower end of the scale and slide rod, 
and adjust the marking arm either clockwise or counterclockwise until 
the pad lies beneath the center intersecting lines on the screen. Tighten 
the setscrew and recheck. 
b. If the length of the arm seems too little or too great, adjust by 
loosening the setscrew at the bottom of the marking arm support and 
sliding the arm in the direction necessary to correct the error. Before 
tightening the setscrew make sure the well and cup are at right angles 
to the axis of the marking arm. Tighten the setscrew and recheck. 56 
32. To Adjust Lock Pressure 
Wherever necessary, nuts or setscrews are provided whereby the hold- 
ing action of a lock can be adjusted. To adjust, loosen or remove any 
retaining screw, nut or pin and adjust until sufficient holding action is 
obtained without putting too much strain on any member. Care must 
be exercised so as to permit free action when the lock is released and 
to prevent binding. If this condition cannot be obtained, replace the 
worn lock parts. Tighten retaining screw, nut or pin and recheck action. 
(See par. 37.) 
33. To Center Screen Longitudinally 
On the shaft of the lock (fig. 9 (9)) is a cam having an adjustable screw 
bearing against the side of the rack on the vertical column. The bracket 
through which this lock shaft passes has a similar adjusting screw. 
Adjust these screws alternately until the screen locks parallel to the side 
of the horizontal carriage. Check the action of the lock to be sure that 
it operates properly. (See par. 37.) 
34. To Remove Play in Vertical Column 
In the two vertical column bearings mounted on the gear housing are 
adjusting screws locked with nuts. These screws are intended to bear 
against the side of the gear rack on the vertical column to reduce any 
play of the assembly. If necessary, adjust these screws until they just 
bear against the rack without binding. Tighten lock nuts and recheck. 
35. To Adjust Eccentric Bearings 
Wherever necessary, eccentric bearings are provided to permit taking up 
excessive play in the carriage. These consist of regular bearings mounted 
on either an eccentric shaft or bushing. To adjust, loosen the retaining 
nut or mounting screw and rotate the shaft or bushing so that there is 
.012 inch clearance between the opposing bearing and the rail. Approxi- 
mately four thickness of newspaper are equivalent to .012 inch. Tighten 
retaining nut or mounting screw and recheck. 
36. To Adjust Brace Rods 
Shorten or lengthen the brace rods as necessary by first loosening the 
lock nut and then rotating the rod in the eccentric. Adjust to a good 
snap action and retighten lock nuts to maintain adjustment. 
37. To Adjust Screen Arm Lock Mechanism 
The operation of this lock should be such so that the cam will always 
free itself. Adjust by removing the cotter pin which holds the slotted 
head friction nut and turn the nut until there is definite friction of the 
cam. Replace the cotter pin and check action. PART FOUR 
AUXILIARY EQUIPMENT 
Section XV. X-RAY FIELD UNIT GENERATOR 9606000 
38. General 
a. This item is designed for use as an auxiliary source of current for 
the unit. No generator having a different item number should be used. 
Two receptables are provided, either of which may be used to connect 
line cable plug of the Airflow unit to the generator. 
b. Detailed instructions pertaining to this auxiliary equipment are con- 
tained in TM 8-630. 
39. Installation 
The location of this plant is important- as this model is a portable type, 
and will frequently be operated on the ground. A place should be 
selected where it will be as free as possible from sand, mud, and dust. 
Although the unit is protected against normal exposure, it is desirable to 
provide as much shelter as possible. 
40. Exhaust 
When operated in a closed or even well ventilated room or tent, the 
exhaust pipe must be connected by a flexible metal hose, or some other 
means, to the outside. The exhaust fumes are poisonous and can cause 
illness and death. 
41. Connecting X-Ray Unit 
Before applying the X-ray load the power unit should be run for a slight 
warm-up period, long enough so its operation is stable and no further 
chocking is necessary. Never permit starting of the generator without 
having the main switch of the X-ray control in the OFF position. 
Section XVI. USE OF TABLE WITH CONTROL 
AND TUBE OF FIELD UNIT 9608500 
42. Installation 
If it is desired to operate this table with the tube, transformer, control 
and shockproof cables, of the Army Field Unit 9608500, it will be found 58 
to be extremely simple to handle. The tube is installed either above 
or below the table as in figures 2 or 3. The transformer and control 
should be placed at the end of the table that would be at your left if you 
stood at the side of the table facing the localizer dial and it should be 
placed about 1 foot beyond and 6 inches away from the leg of the table. 
The control should be mounted on the top of the transformer and the two 
should be so turned that the back of the control and back of the trans- 
former are facing the space at the left of the table. If the unit is placed 
in this manner, it will provide the best position for the cables, and will 
be convenient for the operator to adjust the controls. If it is in this 
position, the shockproof cables and the smaller gauge or motor cables 
to the tube should be supported by the canvas straps on the back of the 
control. This will remove the strain from the cables and support them 
in a graceful rather than in a sharp bend. It will be noticed that canvas 
straps are provided on the elevating mechanism housing adjacent to the 
vertical cranking mechanism on the table. When using the table fluoro- 
scopically the shockproof cables and the motor cables should be supported 
at this point, and if properly done the cables will assume large radius 
curves which will protect them from undue strain which would break 
down the insulation. In the event that the table is used in this manner, 
there will be available with the transformer and control a footswitch 
instead of the push button which is supplied with the Airflow shockproof 
head. 
43. Accessories 
Packed in the tool compartment of the horizontal carriage is an extension 
cord for the localizer circuit. This cord can only be used with item 
No. 9608500 as it will be found that the regular cord is too short to 
reach to the control if the transformer is placed in the proper relation- 
ship to the table. 
44. Capacities 
The instructions covering the operation of the tube, transformer, and 
control of item No. 9608500 should be followed so far as they apply, 
but these instructions will still cover the use of the tube with this table. 
45. Precautions 
Canvas straps are also provided for mounting the cables of the shock- 
proof tube of item No. 9608500 to the radiographic tubestand for hori- 
zontal or vertical radiography. These canvas straps will properly sup- 
port the cables at the upper extremity of the radiographic tubestand, 
and will prevent the cables from sagging or interfering with the opera- 
tion of the unit. APPENDIX 
STORAGE AND SHIPMENT; SPARE PARTS 
I. Storage and Shipment 
Prior to repacking, all parts should be cleaned and checked for complete- 
ness and shortages noted. Replace all members into their proper place 
in the chest following the printed instructions and photographs mounted 
in the lids. Other places where undue friction or strain will cause 
damage should be checked and if the unit has been properly packed no 
pressure will be required to close the chests. 
2. Spare Parts 
Figures 11 to 16, inclusive, show spare parts which can be requisitioned 
through regular channels. 60 
Med. Dept. 
No. Nomenclature 
1. 9R03654 HANDLE, LOCK, TUBE HEAD: 
2. 9R03658 CLEVIS PIN, TUBE HEAD LOCK HANDLE: 
3. 9R03888 GASKET. TUBE PORT: 
4. 9R04I38 RECEPTACLE, MALE, FIFTEEN POLE: 
5. 9R04I32 RECEPTACLE, FEMALE. FOUR POLE, COMPLETE: 
6. 9R04I30 RECEPTACLE, FEMALE, TWO POLE, COMPLETE: 
7. 9R04084 PLUG, FILLER. TUBE HEAD: 
Figure 11. Spare parts for tube head, Airflow unit. 61 
Med. Dept. 
No. Nomenclature 
1. 9R04I48 RHEOSTAT, VARIABLE, 50 WATT. 250 OHMS, WIRE 
WOUND. VITREOUS ENAMELED: 
2. SROI113 BULB. 6-8 V.. I C.P., T 3l/4, SINGLE CONTACT 
BAYONET. FROSTED: 
3. 9R04I30 RECEPTACLE, FEMALE, TWO POLE. COMPLETE: 
Figure 12. Spare parts for control subpanel, Airflow unit. 62 
Med. Dept. 
No. 
Nomenclature 
1. 9R036I0 SWITCH, TOGGLE, 3 P.D.T., CENTER STOP: 
2. 9R036I4 SWITCH, TOGGLE, D.P.D.T., SPRING RETURN: 
3. 9R03956 KNOB, SWITCH CONTROL, BAKELITE: (For retaining 
spring order 9R04256). 
4. 9R036I8 VOLTMETER: 
5. SR00365 BULB. 6-8 V., I C.P., SINGLE CONTACT BAYONET: 
6. 9R03620 MILLIAMMETER: 
7. SR0III5 RESISTOR, FIXED, 25 WATT, 6000 OHMS. WIRE 
WOUND, VITREOUS ENAMELED: 
8. SR0III6 RESISTOR, VARIABLE. 25 WATT. 6000 OHMS. WIRE 
WOUND. VITREOUS ENAMELED: 
9. 9R036I6 SWITCH, TOGGLE, D.P.D.T.: 
10. 9R04I28 RECEPTACLE, FEMALE, TWO POLE: 
Figure 12. Spare parts for control, Airflow mit. 63 
Med. Dept. 
No. Nomenclature 
1. 9R04292 SWITCH, MULTIPLE TAP. ELEVEN POLE: 
2. 9R04294 SWITCH, MULTIPLE TAP, SIX POLE: 
3. 9R04I44 RELAY, ASSEMBLY: 
4. 9R04I42 RELAY, CONTACTOR: 
5. 9R04I34 RECEPTACLE, FEMALE. FIFTEEN POLE: 
6. 9R04I32 RECEPTACLE, FEMALE. FOUR POLE, COMPLETE 
7. 9R04I36 RECEPTACLE. MALE, FOUR POLE: 
Figure 14. Spare parts for relay panel and autotransformer, Airflow unit 64 
Med. Dept. 
No. 
Nomenclature 
1. 9R03694 ARM, MARKING, DEPTH INDICATOR; 
2. 9R03780 CABLE, CONTROL. DIAPHRAGM, COMPLETE: 
3. SROI I 14 BULB. 12-16 V.. 3 C.P.. G 6, DOUBLE CONTACT 
BAYONET: 
4. 9R04I58 SCREEN, FLUOROSCOPIC: 
5. 9R039I0 GLASS. LEAD, PROTECTIVE. FLUOROSCOPIC: 
6. 9R05238 SHIELD. PROTECTIVE. AUXILIARY. LEADED RUBBER: 
7. 9R03804 CLOTH, DAYLIGHT FLUOROSCOPIC HOOD: 
Figure 15. Spate parts for screen, hood and depth indicator, Airflow unit. 65 
Med. Dept. 
No. 
1. 9R038I8 CONE. RADIATION; 
2. 9R03746 CABLE, THIRTEEN CONDUCTOR: 
3. 9R04082 PLUG, FEMALE, FIFTEEN POLE: 
4. 9R04096 PLUG, MALE, FIFTEEN POLE: 
5. 9R04090 PLUG AND SLEEVE, MALE, LOCALIZER CORD: 
6. 9R03660 TUBE AND CRADLE. X-RAY: 
7. 9R04076 PLUG, FEMALE, LOCALIZER CORD: 
8. SR00072 CORD, NEOPRENE. NO. 18, TWO CONDUCTOR: 
9. SR00073 CORD, NEOPRENE, NO. 16, TWO CONDUCTOR: 
10. 9R04094 PLUG, MALE, FOUR POLE: 
11. 9R04088 PLUG, MALE, TWO POLE: 
12. 9R03622 CABLE, LINE, COMPLETE: 
13. 9R04080 PLUG, FEMALE, FOUR POLE. COMPLETE 
14. 9R03626 PLUG, MALE, TWO POLE, COMPLETE; {For Insert only order 9R15016). 
15. 6R50408 NUT, RETAINING, DIAL KNOB, HAND TIMER: 
16. 6R50398 PUSH BUTTON, HAND TIMER: 
17. 6R50404 DIAL, HAND TIMER; 
18. 6R50406 KNOB, DIAL, HAND TIMER: 
19. 6R50388 CASE, HAND TIMER: 
Nomenclature 
Figure 16. Spare parts for timer and cables. Airflow unit. INDEX 
Paragraph Page 
Accessories 6 11 
Adjustment: 
Brace rods 36 56 
Eccentric bearings 35 56 
Lock pressure 32 56 
Screen 33 56 
Screen arm lock mechanism 37 56 
Skin marker 31 
Vertical column 34 56 
Alignment of tube 13ft 43 
Assembling 8a 12 
Bearing, eccentric 35 56 
Binding, carriage assembly 23ft 54 
Brace rods 36 56 
Breaker. (See Circuit breaker.) 
Breaker indicator light 10c 40 
Breaker reset switch 9/ 39 
Cable, repair 29 55 
Calibration 13c 44 
Capacity 4a 
Check filament switch 9d 39 
Circuit breaker: 
Description 10c 40 
Trips constantly 22f 53 
Contacts 30 55 
Contents of chest 3a 
Crank 11c 40 
Current, source of 26 54 
Depth indicator lift 40 
Description 3a 
Dial, localizer lid! 41 
Failure or unsatisfactory operation 7 12 
Field unit: 
Accessories 43 58 
Capacities 44 58 
Precautions 45 58 
Use of 42 57 
Fifty cycle operation 4a 10 
Filament control knob 9c 39 
Fluoroscopic rating 4a 10 
Fluoroscopy 12a 42 
Foreign body localization 13a 43 
Fuses: 
Blow out constantly 22a 51 
To replace 25 54 
Gauge, calibration 13c 44 
Hand timer: 
Description 9h 39 
Not operating 22g 53 67 
Paragraph Page 
Kilovolt meter 10a 40 
Kilovolt selector knob 9c 39 
Knob, switch control. (See Kilovolt selector knob or filament control 
knob.) 
Line compensator switch: 
Description 9i 39 
To set 27 54 
Localization 13a 43 
Localizer dial lid 41 
Localizer, inaccuracy in 23a 53 
Lock; 
Screen arm lock adjustment 37 56 
To adjust 32 56 
Locking levers 41 
Looseness in table 23b 54 
Lubrication 18 49 
Main switch 9o 38 
Maintenance, operator: 
After operation 19c 50 
Before operation 19a 49 
During operation 19b 50 
Organizational 20b 50 
Manufacturer 4b 11 
Maximum ratings 4a 11 
Milliammeter; 
Description lOh 40 
Failure 22c 52 
Indicates but fluctuates 22e 52 
Indicates but X-rays are not produced 22d 52 
Models 3b 9 
Procedure, localization 13d 45 
Protective devices 6 11 
Publications lb 2 
Push button: 
Not operating : 22h 53 
Use of 9g 39 
Radiographic-fluoroscopic switch % 39 
Radiographic rating 4a 10 
Radiography 14a 46 
Receptacle, contact test 28 55 
Records 2 2 
References lb 2 
Screen, to center 33 55 
Service. (See Maintenance.) 
Shipping App 59 
Shutter control 11a 40 
Skin marker: 
To recenter 31 1515 
Use of 11& 40 
Spare parts: 
Description 3a 2 
Illustrations App. 59 
Spare parts requisition ." la 2 
Storage App 59 
Switch, D. P. D. T. toggle. {See Radiographic-fluoroscopic safety 
switch.) 68 
Paragraph Page 
Switch, 3 P.D.T. toggle. (See main switch.) 
Switch, 6-pole multiple tap. (See Line compensator switch.) 
Switch, spring return D.P.D.T. toggle. (See Check filament switch 
or Breaker reset switch.) 
Timer, hand 9h 39 
Tools 5 11 
Tools and equipment 17 49 
Tube alignment 13 b 43 
Trouble shooting: 
Electrical 22 51 
Mechanical 23 53 
Vertical column: 
Crank 11c 40 
Play in 34 56 
Vibration in table 23b 54 
Voltmeter, failure 22b 51 
X-ray field unit generator; *■ 
Connection of 41 57 
Exhaust 40 57 
Installation 39 57 
Operation 15 48 
Use of 38a 57