TM 11-1223
D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L
C O M P U T E R T E S T S E T
T S - 9 0 9 / P P M
/
This copy is a repr int which includes current
p a g e s f r o m C h a n g e s 1 , 3 , 4 , 5 a n d 6 .
4
H E A D Q U A R T E R S Ž D E P A R T M E N T O F T H E A R M Y
JUNE 1957
WARNING
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT
Be careful when working on the220-volt power supply circuits, oron the 115-volt ac line connections
DON’T TAKE CHANCES!
Changes in force: C1, C3, C4, C5, and C6
TM 11-1223C6
HEADQUARTERSDEPARTMENT OF THE ARMYWASHINGTON, DC, 10 October 1975
COMPUTER TEST SET TS-909/PPMINCLUDING REPAIR PARTS AND SPECIAL TOOL LISTS
TM 11-1223, 24 June 1957, is changed as followsPage 3, paragraph 2. Delete paragraph 2 andSubstitute:
2. Forms and Recordsa. Reports of Maintenance and Unsatisfactory
Equipment. Maintenance forms, records, andreports which are to be used by maintenancepersonnel at all maintenance levels are listd inand prescribed by TM 38-750.
b. Reports of Packaging and Handling Deficien-cies. Fill out and forward DD Form 6 (PackagingImprovement Report) as prescribed in AR 700-58/NAVSUPINST 4030.29/AFR 71-13/MC0P4030.29A, and DSAR 4145.8
c. Discrepancy in Shipment Report (DISREP)(SF 361). Fill out and forward Discrepancy inShipment Report (DISREP) (SF 361) as pre-
scribed in AR 55-38/NAVSUPINST 4610.33A/AFR 75-18/MCO P4610.19B, and DSAR 4500.15.
Paragraph 2. Subparagraph c is supersededas follows
2.2. Reporting Of Equipment PublicationImprovementsThe reporting of errors, omissions, and recom-mendations for improving this publication by theindividual user is encouraged. Reports should besubmitted on DA Form 2028 (RecommendedChanges to Publications and Blank Forms) andforwarded direct to Commander, US Army Elec-tronics Command, ATTN: AMSEL-MA-Q, FortMonmouth, NJ 07703.Page 4. paragraph 5a. Delete paragraph 5a andsubstitute:
5. Items Comprising an Operable EquipmentFig
nsn Qty Nomanclature No.
6625-00-510-1839 Test Set, Computer TS-909/PPMConsisting of:
1 Cable Assembly, Power Eleetrical CX-3382/U 26625-00-668-7193 1 Cable Assembly, Radio frequency CG-784B/U 26625-00-965-1478 1 Lead Test CX-10144/U 26625-00-395-9313 1 Test Lead Set CX-1331/U 2
Subparagraph b. Redesignate subparagraph III” from the References column.b as “5.1 Running Spares.” Page 30, appendix II. Delete appendix II in itsPage 12, paragraph 18.1. sequence No. 1. Delete entirety."App. III" from the Procedure and References Appendix IV (page 11, C 4). Insert “Section II”columns, over chart.
Paragraph 18.4, Sequence No. 3. Delete “App.
1
By Order of the Secretary of the Army:
Official:
PAUL T. SMITHMajor General, United States ArmyThe Adjutant General
Distribution:
FRED C. WEYANDGeneral, United States ArmyChief of Staff
Active Army:USASA (2)Dir of Trans (1)COE (1)TSG (1)USAARENBD (1)AMC (1)MICOM (2)TECOM (2)TRADOC (2)ARADCOM (2)ARADCOM Rgn (2)OS Maj Comd (4)LOGCOMD (3)USACC (4)MDW (1)Armies (2)Corps (2)HISA (Ft Monmouth) (43)Ft Gillem (10)Ft Gordon ( 10)Ft Huachuca (10)Ft Carson (5)Ft Richardson (ECOM Ofc) (2)WSMR (1)Svc Colleges (1)USASESS (5)USAFAS (5)USAINTCS (3)USAADS (2)USAARMS (2)USAIS (2)USAES (2)AD (1) except
SAAD (30)LBAD (14)TOAD (14)SHAD (3)
USA Dep (2)Sig Sec USA Dep (2)Sig Dep (2)ATS (1)MAAG (1)
ARNG & USAR: None.For explanation of abbreviations used, see AR 310-50.
WRAMC (1)USARMIS (1)USAERDAA (1)USAERDAW (1)Sig FLDMS (1)Units org under fol TOE: 1 ea.
6-1006-1156-1166-1556-1566-1856-2156-2166-3006-3656-36677-10011-11711-500(AA-AC)1729-129-11291529-1629-2129-2529-2629-3529-3629-4129-8529-8629-8729-13428-13629-427375757-100
2
1
TECHNICAL MANUALNo. 11-1223
COMPUTER TEST SET
CHAPTER 1.Section I.
I I
CHAPTER 2.
Section I.
II.
CHAPTER 3.Section I.
II.
CHAPTER 4.
CHAPTER 5.Section I.
II.
III.
INTRODUCTIONGeneralScope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TM 11-1223
HEADQUARTERS,DEPARTMENT OF THE ARMY
WASHINGTON 25, D. C., 24 June 1957
TS-909/PPM
Paragraph
. . . . . . . . . . . . . . . . . . . . 1Forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Description and dataPurpose and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Components of Computer Test Set TS-909/PPM . . . . . .Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSTALLATION AND OPERATING
INSTRUCTIONSService upon receipt of equipmentUnpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking unpacked equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .Connections and operationControls and instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BRIDGE ADJ dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Starting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Balance adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Operating procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Stopping procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ORGANIZATIONAL MAINTENANCEPreventive maintenance servicesTools and materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .General preventive maintenance techniques . . . . . . . . . . . . . . . . .Use of preventive maintenance forms . . . . . . . . . . . . . . . . . . . . .Troubleshooting at organizational maintenance levelGeneral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Visual inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting by using equipment performance
check list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Equipment performance check list . . . . . . . . . . . . . . . . . . . . . . . . . .THEORYTheory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Circuit analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FIELD MAINTENANCE Troubleshooting at field maintenance levelTroubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Test equipment required for troubleshooting . . . . . . . . . . . . . . . . .Troubleshooting chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dc resistances of transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RepairsReplacement of parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassembly and reassembly of dekapot . . . . . . . . . . . . . . . . . . . . . .Final testingPurpose of final testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Test equipment required for final testing . . . . . . . . . . . . . . . .
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1920
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Page
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3344
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888889
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121212
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1515
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20202021
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ParagraphSection III Final testing-continued
Resistance check of dekapot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Phase sensitivity check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Sensitivity check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SHIPMENT AND LIMITED STORAGE ANDDEMOLITION TO PREVENT ENEMY USE
Shipment and limited storageDisassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Material requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Field repackaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
II. Demolition of material to prevent enemy useAuthority for demolition . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 39Methods of destruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Page
272828
292929
2930
Figure 1. Computer Test Set TS-909/PPM.
2
CHAPTER 1
INTRODUCTION
Section I.
1. Scopea. This manual covers the installation, opera-
tion, maintenance, and repair of ComputerTest Set TS-909/PPM (fig. 1).
b. Forward comments on this publicationdirectly to Commanding Officer, U. S. ArmySignal Publications Agency, Fort Monmouth,N. J.
2. Forms and Recordsa. Unsatisfactory Equipment Reports.
(1)
(2)
Fill out and forward DA Form 468(Unsatisfactory Equipment Report)to Commanding General, U. S. ArmySignal Equipment Support Agency,Fort Monmouth, N.J., as prescribedin AR 700-38.Fill out and forward AFTO Form 29(Unsatisfactory Report ) to Comman-der, Air Materiel Command, Wright-Patterson Air Force Base, Dayton,
GENERAL
Ohio, as prescribed35D-54.
b. Damaged or Improperout and forward DD Form 6,aged or Improper Shipment)
in AF TO 00-
Shipment. Fill(Report of Dam-as prescribed in
AR 700-58 (Army), and AFR 71-4 (AirForce).
c. Preventive Maintenance Forms.(1)
(2)
Prepare DA Form 11-238 (OperatorFirst Echelon Maintenance Check Listfor Signal Corps Equipment-RadioCommunication, Direction Finding,Carrier, Radar) (fig. 7) in accordancewith instructions on the back of theform.Prepare DA Form 11-239 (Secondand Third Echelon MaintenanceCheck List for Signal Corps Equip-ment-Radio Communication, Direc-tion Finding, Carrier, Radar) (fig. 8)in accordance with instructions on theback of the form.
Section II. DESCRIPTION AND DATA
3. Purpose and UseComputer Test Set TS-909/PPM is a null-
indicating device used for alining and adjust-ing 400-cycle analog computers of radar sets.The computer is alined and adjusted by com-paring the computer analog voltages to stand-ard reference voltages applied through the testset. For specific alinement procedures for aparticular computer, consult the applicabletechnical manual for that computer.
4. Technical CharacteristicsReference-voltage
range . . . . . . . . . . . . .200 volts maximum.
Input impedance:Across reference
terminals . . . . .At signal input
terminals . . . . .Sensitivity . . . . . . .
Power requirements:Dc . . . . . . . . . . .
AC . . . . . . . . . . . . .
Number of tubes . . . . .Weight . . . . . . . . . . . . .
0-10,000 ohms.
More than 1 megohm.Better than 5 mv at
input.
10 ma at 200 volts(±10 percent).
110-125 volts, 400 cps,single phase.
1.27.5 pounds.
3
4
5. ComponentsTS-909/PPM
a. Components.
of Computer Test Set
The components of the testset are listed in the following table:
b. Running Spares. The following is a listof running spares for the test set. These itemsare stored in a separate package.
Quantity Item15 Crystal unit, rectifying 1N63
1 Electron tube type 57515 Fuse, cartridge, .5 ampere6 Fuse, cartridge, .01 ampere8 Lamp, glow (NE-51 )3 Lamp, panel (Mazda No. 47)
6. Descriptiona. Panel-Chassis Assembly. This test set
consists of a panel-chassis assembly containedin a steel case. The case is equipped with acarrying handle and four protective feet. The
cover contains all the cords and cables suppliedwith the equipment. All controls and testjacks of the test set are mounted on the frontpanel.
b. Cables (fig. 2). Five cables are suppliedwith the test set. Two of the cables (W4603and W4604) are single rubber-covered testleads commonly used with multimeters. Athird lead (W4605) is identical but has an alli-gator clip on one end. Cable W4602 is made ofAN type RG-59A/U coaxial cable and is ter-minated at the test set end with connectorUG-260/U. At the other end is a conventionaltest prod. Cable Assembly Power ElectricalCX-3382/U (W4601) has six conductors and isterminated with AN-3106A-20-7 male andfemale connectors. All cables are 5 feet long.
5
Figure 2. Cables W4601 through W4605.
C H A P T E R 2
I N S T A L L A T I O N A N D O P E R A T I N G I N S T R U C T I O N S
Section I. SERVICE UPON
7. Unpacking
a. Packaging Data. When packaged for ex-
port shipment, the test set is placed in a mois-ture-vaporproof container and is packed in awooden case. For domestic shipment, thewooden case may be omitted. The test setpacked for export shipment is shown in figure3. The case is 16½ inches by 19½ inches by23¾ inches. The volume of the case is 4.4cubic feet and the total weight is approximately55 pounds.
b. Removing Contents (fig. 3). To unpackthe equipment follow procedure in (1) through(4) below.
(1) Cut and fold back the metal straps.
(2) Remove the nails from the top andone side of the case with a nail puller.Do not attempt to pry off the sidesand top.
RECEIPT OF EQUIPMENT
(3)
(4)
Open the moistureproof barrier andremove the outer corrugated carton.Open the outer and inner corrugatedcartons and remove the contents.
8. Checking Unpacked Equipmenta. Inspect the test set for damage incurred
during shipment. lf the equipment is incom-plete or has been damaged during shipment,refer to paragraph 2b.
b. If the equipment has been used or recon-ditioned, check to see whether it has beenchanged by a modification work order (MWO).If modified, the MWO number will appear onthe front panel near the nomenclature plate.Indicate the MWO number on the main sche-matic diagram (fig. 10).
c. Loosen the fuse holder caps and check tosee that the fuses have the proper amperagerating as listed on the front panel,
Caution: To avoid damage to the test set, donot use any fuse other than that specified.
6
7
TM 1223-3
Figure 3. Packaging diagram.
Section II. CONNECTIONS AND OPERATION
9. Controls and InstrumentsThe following chart lists the controls and
instruments of the test set (fig. 4) and theirfunctions:
MAIN POWERswitch
BRIDGE ADJ dial
POWER ON lamp
Blown fuse indicatorlamps
NULL METER
In ON position, turns computertest set on.
Adjusts test set potentiometerto obtain zero reading onNULL METER.
When lit, indicates that poweris applied to the test set.
With power applied to test set,lamp lights when correspond-ing fuse is open.
Indicates voltage across bridge circut.
10. Connections(fig. 4)
Place the test set on a firm support within18 inches of the analog computer under test.The test set may be placed on top of the com-puter dust cover during alinement and adjust-ment. Position the test set so that its controlsand the controls of the equipment being testedare both within easy reach.
Warning: Do not allow the test leads orcables to drape across high voltage or radiofrequency (rf) circuits. Severe burns or shockand damage to equipment may result.
a. Connect the six-wire cable (W4601) toJ4601 on the test set, and to the proper jack onthe computer under test. (See technical man-ual for the individual radar set and analogcomputer. )
b. Connect the coaxial cable to the TESTPROBE jack on the test set panel.
c. Connect the black (W4603) cable to the-REF VOLT jack on the test set panel.
d. Connect the red (W4604) cable to the+REF VOLT jack on the test set panel.
e. Connect the black (W4605) cable (withclip) to the GROUND jack on the test set panel.
11. BRIDGE ADJ DialThe inner scale of the BRIDGE ADJ dial is
controlled by the center knob and is continu-ously adjustable from 0 to 100. The dial scaleis marked in units of 10. A setting of 3 repre-
8
sents 30 ohms. The middle dial, operated bya handle fixed to it (fig. 4). controls a 10-posi-tion step switch. Each marking represents100 ohms. With the outer dial set at zero, themiddle dial set at 4, and the inner dial half-waybetween 5 and 6, the reading is 455 ohms. Theouter dial is turned by grasping it at its outeredge and also controls a 10-position step switch.Each marking represents 1,000 ohms.
12. Starting Procedurea. Apply power to the radar set.b. After a 30-second warm-up period, throw
the MAIN POWER switch on the test set tothe ON position. The POWER ON pilot lampof the test set should glow.
c. Connect the coaxial lead test probe (onW4602) and the two reference-voltage probesof the test set to the computer chassis.
d. Check to see that the NULL METER ofthe test set reads zero. If it does not, set thebalance adjustment as described in paragraph13.
13. Balance AdjustmentChanges in the resistances of the crystal
diodes or other circuit components can causethe NULL METER to fail to read zero oninitial check (par. 12c and d). Balance ad-justment R4608 is used to reset the NULLMETER to zero. This adjustment is made asfollows :
a. Remove the panel-chassis assembly fromthe case by loosening the six captive screws inthe front panel and pulling the panel-chassisforward.
b. Connect the cables to the front panel jacksas described in paragraph 10.
c. Set the MAIN POWER switch to the ONposition.
d. Short the TEST PROBE and the + REFVOLT and-REF VOLT leads to the GROUNDlead .
e. Observe the null indicator as balance ad-justment R4608 (fig. 5) is rotated fully clock-wise and then fully counterclockwise. Theneedle should deflect to right and left of zeroat least 25 percent of full scale in each direc-tion.
TM 1223-2
Figure 4. Computer Test Setpanel.
f. Adjust R4608 so that the NULL METERreads zero.
14. Operating Proceduresa. Operation as Null Meter.(1)
(2)
Set all dials of the BRIDGE ADJ tozero.Connect the GROUND lead to a goodground point on the chassis of thecomputer under test; connect theTEST PROBE to the test point forthe analog voltage to be checked; thered test lead to the plus referencevoltage test point in the computerchassis: and the black test lead tothe return for the plus referencevoltage.
TS-909/PPM, front
(3) Set BRIDGE ADJ to obtain a nullreading on the meter and check theBRIDGE ADJ dial setting to see thatit is within the prescribed limits listedin the computer manual.
b. Operation as Computer Alinement Tester.Note. In using the test set to aline a computer sys-
tem, refer to figure 6, which shows the diagram of atypical 400-cycle analog computer for which the testset was designed. For the specific alinement procedurefor a particular computer, consult the applicable tech-nical manual for that computer.
The alinement procedure consists of adjust-ing potentiometers R1, R2, R3, and settingpotentiometer drive linkage between R1 andD, so that the voltage picked off R1 for anygiven differential input is of the proper pre-determined analog value.
9
TM 1223-4
Figure 5. Rear view of test set chassis.
(1) Alinement of driven-shaft potentiom-eter R1 (fig. 6).
(a)
(b)
(c)
(d)
(e)
10
Connect the red test lead from the+REF VOLT jack of the test setto the plus reference voltage testpoint (TP3) of the computer.Connect the black test lead fromthe -REF VOLT jack of the testset to test point TP2 (return forthe reference voltage).Connect the coaxial test probe totest point TP1 (the analog voltagebeing checked).Set the functions (F1 a n d F2)which control the shaft position ofR1 to settings which should resultin zero voltage at the center tap ofR1. (The arm of R1 is mechani-cally linked to F1 and F2 and can-not be rotated except by changingthe settings of these functions.)If the NULL METER does not readzero, rotate the body of potentiom-eter R1 until a null is obtained.
(2) Alinement of balancing potentiometerR2 (fig. 6).
(a)
(b)
Consult the computer alinementchart (in computer technical man-ual) for differential settings of F,and F2 which correspond to a givensetting of the test set BRIDGEADJ dial. Set F1 and F2 accord-ing to the chart, and set theBRIDGE ADJ dial at the corre-sponding setting.
With the test leads still connectedas in (1) above, check to see thatthe NULL METER reads zero. Ifit does not, adjust R2 of the com-puter system to obtain a zero read-ing.
(3) Alinement of opposite balancing po-tentiometer R3 (fig. 6).
(a) Move the red test lead of the testset from plus reference-voltage testpoint TP3 of the computer systemto minus reference-voltage testpoint TP4.
Figure 6. Test diagram for typical computer
(b) Consult the computer alinementchart (in computer technical man-ual for arbitrary settings of F2 andF1 which correspond to a given set-ting of the test set BRIDGE ADJdial. Set F2 and F1 according tothe chart, and set the BRIDGEADJ dial at the corresponding set-ting.
(c)
TM 1223-6system alinement.
If the NULL METER does not readzero, adjust R3 of the computersystem to obtain a zero reading.
15. Stopping Procedurea. Throw the MAIN POWER switch to OFF.b. Disconnect the test probe and test leads
and disconnect power cable W4601 from J4601.c. Replace the cables in the test set cover as
shown in figure 1.
11
CHAPTER 3
ORGANIZATIONAL MAINTENANCE
Section I. PREVENTIVE MAINTENANCE SERVICES
16. Tools and MaterialsAn Allen wrench (fig. 5) to fit the dekapot
(BRIDGE ADJ) dial set screws are furnishedwith the test set. Tools and materials used,but not supplied with the test set are listed ina and b below.
a.
b.
c.
Tools.1 Tool Equipment TE-411 Tube Puller TL-201
Materials.Orange stickCloth, lint-free*Cleaning compound (Federal stock No.
7930-395-9542)Sandpaper, flint No. 000*
Test Equipment.Multimeter TS-352A/U
17. General Preventive MaintenanceForms
a. Use No. 000 sandpaper to remove cor-rosion.
b. Use a clean, dry, lint-free cloth or a drybrush for cleaning. If necessary, wipe anyparts, including electrical contacts, with a clothmoistened with Cleaning Compound; wipe theparts dry with a cloth.
Caution: Cleaning Compound is flammable;do not use near a flame. Prolonged breathingof the fumes is dangerous. Make sure thatadequate ventilation is provided.
18. Use of Preventive MaintenanceForms
(figs. 7 and 8)DA Forms 11-238 (fig. 7) and 11-239 (fig.
8) are used for preventive maintenance. In-structions for use of the form appear on thereverse side of the form. Items not applicableto the test set are lined out in the figure.
12
TM 1223-7
Figure 7. DA Form 11-238.
13
TM 1223-8
Figure 8. DA Form 11-239.
14
15
Section II. TROUBLESHOOTING AT ORGANIZATIONALMAINTENANCE LEVEL
19 Generala. The troubleshooting and repair work that
can be performed at the organizational main-tenance level (operators and repairmen) arelimited by the tools, test equipment, and re-placeable parts issued. Accordingly, trouble-shooting is based upon the performance of theequipment and the use of the senses in deter-mining such troubles as burned-out fuses,broken cords, defective tube, cracked insula-tors, etc.
b. Paragraphs 20 through 22 help to deter-mine which component is at fault and in local-izing the fault in the circuit to the defectivestage or item, such as a tube or fuse.
20. Visual Inspectiona. Failure of the test set to operate properly
may be caused by one or more of the following:(1) Worn, broken, or disconnected cords
or plugs.(2) Burned-out fuses (indicated on front
panel when power is on).(3) Broken or disconnected wires.(4) Defectove tube (tube not lit or brok-
en).
b. When failure is encountered and the causeis not immediately apparent, check as many ofthese items as possible before starting a sys-tematic troubleshooting procedure. If possible,obtain information from the operator of the
equipment regarding performance at the timetrouble occurred.
21. Troubleshooting by Using EquipmentPerformance Checklist
The equipment performance checklist willassist the unit repairman in locating the trou-ble in the test set systematically. All correc-tive measures which he can perform are givenin the corrective measures column. Start atthe beginning of the check list and follow eachstep in order. In some cases, the abnormalindication permits immediate localization oftrouble to a particular part and the correctivemeasure indicates the specific part to be re-paired or replaced. In other cases, however,the abnormal indications only sectionalize thetrouble to a particular group of parts. Inthese latter cases, the corrective measures callfor additional testing procedures to localize thetrouble. When the procedure referred to isbeyond the scope of organizational maintenancepersonnel, troubleshooting at a higher echelonis required. Note on the repair tag how theequipment performed and what correctivemeasures were taken.
22. Equipment Performance ChecklistBefore starting the equipment performance
checklist, apply power to the radar set andallow the test set to warm up for at least 30seconds.
Item Action or condition Normal indication
BRIDGE ADJ Turn to obtain null read- NULL METER readscontrol ing on meter. zero.
Test computer Follow operating pro- Null obtained on NULLcedures in paragraph METER when com-14b puter is properly
adjusted.MAIN POWER Turn to OFF. POWER ON pilot light
switch will go out.
Corrective measure
Check resistance ofdekapot, Higherechelon repair isrequired.
Dekapot linearity maybe impaired. Higherechelon repair isrequired.
16
C H A P T E R 4
T H E O R Y
23. Theory of OperationFigure 9 is a functional block diagram of
the test set. Analog voltage EA and referencevoltage ER are obtained from the computerunder test. In the computer system shown infigure 6, the pick-off arm of highly linear po-tentiometer R1 is linked to the output of me-chanical differential D1. As shown, the voltagepicked off R1 should electrically represent thedifference in the two mechanical inputs to thedifferential (F 1 - F2). The amplitude of thepickoff voltage corresponds to the angular dif-ference in shaft positions F1 and F2, and thephase of the voltage determines whether thedifference is positive or negative.
a. Input Transformer T4601. This trans-former receives analog voltage EA at one endof its primary, and reference voltage E R
through BRIDGE ADJ R4611 at the other end.When these voltages are equal, a null occurs.Any difference between EA and ER, however,causes a voltage to be induced into the sec-ondary of T4601. This difference voltage, ED,is then amplified and applied through thebridge circuit to the NULL METER, causingthe meter needle to deflect.
b. BRIDGE ADJ Potentiometer R4611. Ac-cording to a prescribed setting of its dial, thisdecade potentiometer picks off an accurate per-centage of the reference voltage from the sys-tem under test and compares it to analogvoltage EA as described in a above.
c. Difference Voltage Amplifier V4601. Thistwo-stage amplifier receives difference voltageED from the secondary of T4601, amplifies it,and applies it through transformer T4602 tothe bridge circuit.
d. Bridge. The bridge is made up of aphase-sensitive network consisting of the fourcrystals, CR4601, CR4602, CR4603, and CR-4604. The primary of bridge voltage trans-
former T4603 is supplied 115 volts alternatingcurrent (ac), 400 cycles, from the computerunder test. Bridge voltage ER is applied tothe bridge to set a standard for phase deter-mination.
24. Circuit Analysis(fig. 10)
a. Amplifier V4601. The difference voltage,ED, from the secondary of transformer T4601is applied to control grid (pin 2) of the firststage. The amplified output of the first stageis coupled through capacitor C4601 to the inputgrid of the second stage. Resistor R4604 isthe plate load resistor for the first stage. Re-sistors R4603 and R4606 are the cathode biasresistors for the first and second stages, re-spectively. Resistor R4605 is the grid-leak re-sister for the second stage, and capacitor C4603is a noise bypass capacitor. The amplified out-put of the second stage appears across theprimary of T4602. Plate voltage for the twostages is obtained through J4601 from the com-puter and is applied through .01-ampere fuseF4601. If the fuse should burn out, the platecircuit is completed through R4601 and I 4601and the neon blown fuse indicator lamp lights.
b. Bridge. The bridge standard voltage,E R, is applied to the bridge through the re-sistive network consisting of R4607, balanceadjustment R4608, and R4609. Resistor R4608is adjustable to compensate for resistance vari-ation in the crystal diodes or in other circuitcomponents.
(1) With no error signal into the bridge(EA = ER), alternating current dueto bridge standard voltage ES flowsthrough NULL METER M4601. Themeter, however, has a direct current(dc) movement and reads the ac aver-
17
TM 1223-9
(2)
Figure 9. Computer T’est Set TS-909/PPM, functional block diagram.
age, or zero. This zero reading is with bridge voltage EB to increase thechecked during the starting procedure meter current during one-half the(par. 12). cycle and to decrease it during theAny difference voltage, ED, appearing other half cycle. The phase of theat the plate of V4601 is inductively difference voltage, ED, determines thecoupled into the bridge circuit direction in which the zero centerthrough T4602, where it combines NULL METER deflects.
18
TM 1223-21Figure 10. Computer Test Set TS-909/PPM, schematic diagram.
19
C H A P T E R 5
F I E L D M A I N T E N A N C E
Note. This chapter contains field maintenance in- is limited only by the tools and test equipment availablestructions. The amount of repair that can be per- and by the skill of the repairman.formed by units having field maintenance responsibility
Section I. TROUBLESHOOTING AT FIELD MAINTENANCE LEVEL
Warning: Certain points located throughoutthe chassis of the test set operate at voltagesof 200 volts. Do not touch these points whilepower is applied to the test set. Be very care-ful when handling or testing any part of thetest set while it is connected to the powersource.
25. Troubleshooting Procedures
Troubleshooting at field maintenance levelincludes all the techniques outlined for organi-zational maintenance and any special or addi-tional techniques required to isolate a defectivepart. Because of the simplicity of the circuitand the few parts in the test set, servicing adefective set consists only of tracing the faultto the defective component. The tests listedbelow will aid in isolating the trouble.
a. Troubleshooting Chart (par. 27). Thetrouble symptoms listed in the chart will aid inlocalizing trouble to a specific component orgroup of components.
b. Voltage and Resistance Checks. Thesemeasurements help locate the individual com-ponent at fault. Use resistor and capacitorcolor codes (fig. 11 and 12) to find the valueof the components. Use voltage and resistancediagrams (fig, 13 and 14 and par. 28) to find
Symptom
Main power cable connected to source
of power. MAIN POWER switch
turned ON. POWER ON lamp
does not light.
Fuse lamp I 4601 or I 4602 lights.
normal readings and compare them with read-ings obtained in trouble shooting.
c. Operational Test. The equipment per-formance check list (par. 22) indicates thegeneral location of trouble and in some in-stances the exact nature of the fault.
d. Intermittent Troubles. The possibility ofintermittent troubles should not be overlooked.If present, this type of trouble often may bemade to appear by tapping or jarring theequipment.
26. Test Equipment Required forTroubleshooting
The test equipment required for trouble-shooting the test set is listed below. Technicalmanuals associated with the equipment also arelisted.
Test equipment Technical manual
Electronic multimeter TS-505/U TM 11-5511
Electron Tube Test Set TV-7/ U TM 11-5083
27. Troubleshooting Chart
The following chart is supplied as an aid inlocating trouble in the test set. It lists the
Probable trouble
Defective lamp, power cable, or
T4604.
Blown fuse F4601 or F4602 . . . . . . . .
Correction
Replace defective component.
Replace blown fuse with spare fuse.
If new fuse F4602 blows, check
20
Coaxial TEST PROBE, -REF VOLT Defective potentiometer R4608.and +REF VOLT leads shorted to Defective crystal CR4601,ground. Failure to obtain a zero CR4602, CR4603, or CR4604.reading on NULL METER. Open R4609 or R4607.
Meter fails to deflect when proper Tube V4601 defective . . . . . . . . . .reference voltages are applied dur- Defective dekapot, T4601, com-ing operation as a null meter ponents of V4601 stage.(par. 14a(2)). Defective meter . . . . . . . . . . . . . .
Meter deflects during operation as Dekapot defective . . . . . . . . . . . . . . . . . . .null meter but BRIDGE ADJcontrol cannot cause NULLMETER to zero.
windings of transformers T4603and T4604 for short circuits. Ifnew fuse R4601 blows, checkT4602, R4604, and C4603.
Replace defective component.
Replace tube.Replace defective component.
Replace meter.Replace dekapot (par. 30).
symptoms which the repairman observes, eithervisually or aurally, while making a few simple tests. The procedures described in the equip-ment performance checklist (par. 22) shouldbe followed.
28. Dc Resistances of TransformersThe dc resistances of the transformers in the
test set are listed below:
21
22
Figure 11
RESISTOR COLOR CODE MARKING
( M I L - S T D R E S I S T O R S )
AXIAL-LEAD RESISTORS(INSULATED)
RADIAL-LEAD RESISTORS(UNINSULATED)
23
CAPACITOR COLOR CODE MARKING(MIL-STD CAPACITORS)
Figure 12. MIL-STD capacitor color codes.
TM 1223-14
Figure 13.
DIFFERENCE VOLTAGE
AMPLIFIERV4601
5751/12AX7
Figure 14. Terminal board voltage and resistancediagram.
24
25
TM 1223-14
Section II.
29. Replacement of Partsa. Most of the components of the test set are
readily accessible and can be replaced easily iffound faulty. Refer to figures 5, 15, and 16to locate the components. The sockets, capaci-tors, and transformers are mounted securelyto the chassis with hexagonal nuts and Phillips-head screws. The nuts can be removed easilywith socket wrenches, long-nosed pliers, and/ora Phillips screwdriver.
b. If a transformer requires replacement,carefully mark the wires connected to the ter-minals to avoid disconnection when the newtransformer is installed.
c. To replace components on the rear of thefront panel or on the front of the chassis, sepa-rate the two assemblies by removing the screwsthat secure the panel to the chassis.
30. Disassembly and Reassembly ofDekapot
(fig. 17)
REPAIRS
the resistor gangs. Do not attempt to replaceany resistors within the can, because theproximity of a hot soldering iron might seri-ously affect the values of the resistances.
a. Disassembly. To disassemble the dekapot,follow the procedure below.
(1)
(2)
(3)
Turn all dekapot dials to zero andleave the shafts in that position untilthe dials are replaced after mounting.The zero position is located on an un-mounted dekapot by turning the outerdial counterclockwise to the stop, Theintermediate and inner dials to nothave stops, and can be rotated con-tinuously through zero,Use the small Allen wrench (fig. 15)supplied with the test set to loosenthe two hollow-head setscrews of theinner dial and remove the dial.With the outer dial set at zero, turnthe intermediate dial to 9, locate theaccess hole between position 7 and 8on the edge of the outer dial, andthrough this hole, loosen the setscrewof the intermediate dial.
Figure 15. Rear view of front panel.
TM 1223-14
(4)
(5)
(6)
(7)
(8)
Figure 16. Front view
Return the intermediate dial to zerosetting, loosen the second setscrew ofthe intermediate dial through the ac-cess hole, and remove the intermedi-ate dial.Loosen the two setscrews in the bossunderneath the outer dial and removethe outer dial.Unscrew the hexagonal nut on thedekapot shaft and remove the nut andlockwasher.Identify and unsolder the three wiresattached to the terminals of the deka-pot.Remove the dekapot bracket by loos-ening the two Phillips-head screwsand withdraw the dekapot from thepanel.
b. Reassembly. To reassemble and reset thedial calibration of the dekapot, follow the pro-cedure outlined in (1) through (10) below,
(1) Mount the dekapot in the panel hole,orienting the can so that the three
26
of chassis assembly.
(2)
(3)
(4)
(5)
(6)
(7)
terminals are facing upward for easyaccess, and secure it to the panel withthe lockwasher and hexagonal nut.Replace the dekapot bracket and se-cure it to the mounting with the twohexagonal nuts and washers.Identify the three wires and resolderto the terminals.Replace the outer dial, positioning thezero on a horizontal index marker lineto the left of the shaft, and tightenthe two setscrews.Replace the intermediate dial, posi-tioning its zero in line with the zero ofthe outer dial, and tighten one set-screw through the access hole in theperiphery of the outer dial.Rotate the intermediate dial to posi-tion 9 and tighten the other setscrew.Return the intermediate dial to zero.Replace the inner dial and tighten itssetscrews very lightly.
(8)
(9)
Set the inner potentiometer dial ac-curately by connecting an ohmmeterbetween terminals 1 and 2 of thedekapot. Rotate the inner dial coun-terclockwise until the resistance read-ing falls to a minimum (less than .1ohm ). Slowly rotate the dial clock-wise until the resistance reading justbegins to increase. Loosen the set-screws and set the dial to zero ifnecessary.Check for calibration at the upper
ohmmeter between terminals 2 and 3of the dekapot and rotate the innerdial until the resistance reading justbegins to increase. Loosen the set-screws and reset the dial slightly ifnecessary to obtain an accurate set-ting at full scale.
(10) Check to see that the dials have beencorrectly set by checking for mini-mum resistance between terminals 1and 2 of the dekapot with all dials set
end of the dekapot range by rotating at zero, and for minimum resistanceouter and middle dials to 9 and the between terminals 2 and 3 of theinner dial to full scale. Connect the dekapot with all dials set at full scale.
Figure 17. Exploded view of dekapot.
Section III. FINAL TESTING
31. Purpose of Final TestingThe tests in this section are designed to
measure the performance capability of a re-paired test set. Equipment that meets the re-quirements of these tests will furnish satis-factory operation, equivalent to that of newequipment.
32. Test Equipment Required for FinalTesting
The following items of test equipment arerequired for final testing of the test set:
Electronic Multimeter TS-505/U.
6.3-volt filament transformer.Double-pole, double-throw switch.
33. Resistance Check of DekapotWith the test set panel and chassis removed
from the cabinet, make the following resistancechecks:
a. Set the BRIDGE ADJ dial to zero.b. Use Electronic Multimeter TS-505/U set
to the lowest resistance range to measure theresistance between terminals 1 and 2 of theBRIDGE ADJ potentiometer. The resistanceshould not exceed .2 ohm and should increase
27
TM 1223-19
quickly as the inner dial of the BRIDGE ADJis turned beyond zero.
34. Phase Sensitivity Check
With the test set connected as shown in thetest setup diagram (fig. 18), make the follow-ing phase sensitivity check:
a. Set the BRIDGE ADJ dial to zero.
b. Turn the MAIN POWER switch to ON.
c. Adcance the dial setting on the BRIDGEADJ control until the NULL METER deflectsabout one-half scale.
d. Throw the phase reversing switch shownin the test setup diagram to the opposite posi-tion. The NULL METER should deflect thesame amount in the opposite direction.
35. Sensitivity CheckUsing the same test setup as described in
paragraph 34, make the following check:a. Set the BRIDGE ADJ dial to zero.b. If necessary, zero the NULL METER as
described in the balance adjust procedures ofparagraph 13.
c. Advance the BRIDGE ADJ inner dial to1 (first engraved line on inner dial). This set-ting corresponds to an unbalance of approxi-mately .6 millivolts and should cause a notice-able deflection on the NULL METER.
d. Advance the inner dial of the BRIDGEADJ to 10 (numeral 1 on inner dial). Thissetting should cause at least one-half scale de-flection on the NULL METER.
e. Recheck the phase sensitivity as describedin paragraph 34.
Figure 18. Test setup for phase sensitivity check.
28
CHAPTER 6
SHIPMENT AND LIMITED STORAGETO PREVENT ENEMY
AND DEMOLITIONUSE
Section I. SHIPMENT AND LIMITED STORAGE
36. DisassemblyDisassembly procedures are outlined in a
through d below.
a. Remove all leads connected to the jacks onthe front panel of the test set.
b. Stow the leads in the front cover of thetest set as shown in figure 1.
c. Check the equipment against the table ofcomponents (par. 5).
d. Fasten the cover to the carrying case bymeans of the six snap latches.
37. Material Requirements
a. The following materials are required forpackaging the test set:
b. The wooden packing case is 16½ inchesby 19½ inches by 23¾ inches; 4.4 cubic feet involume; and 12 board feet are used. Theweight when packed is approximately 55pounds.
38. Field RepackagingWhenever possible, use the procedures given
in a through d below to repackage the equip-ment. The information concerning the origi-nal packaging (par. 7a and fig. 3) may also behelpful.
a. Test Set. Secure all covers and fasten-ings; cushion the control panel with flexiblesingle-face corrugated paper. Cushion the testset on all surfaces with pads fabricated offlexible single-face corrugated paper. Placethe cushioned unit within a wrap of flexiblesingle-face corrugated paper. Secure the wrapwith gummed Kraft tape.
b. Tube. Wrap the spare tube with cellulosewadding and flexible single-face corrugatedpaper. Secure the wrap with gummed Krafttape.
c. Spare Parts. Wrap electrical spare partitems individually as required, with cellulosewadding and flexible single-face corrugatedpaper. Secure the wrap with gummed Krafttape.
Note. Consolidate the tube, spare parts, and accesso-ries, packaged as described in b and c above, within awrap of flexible single-face corrugated paper. Securethe wrap with a gummed Kraft tape.
d. Packing and Strapping. Pack the testset package and the spare parts package intothe nailed wooden packing case. Fill voids inthe box with pads of flexible corrugated paper.Use metal strapping around the case whenintended for intertheater shipment.
Section II. DEMOLITION OF MATERIAL TO PREVENT ENEMY USE
39. Authority for Demolition The destruction procedures outlined in para-Demolition of the equipment will be accom- graph 40 will be used to prevent further use or
plished only upon order of the commander. salvaging of this equipment.
40. Methods of Destruction
a. Smash. Smash the case, controls, tube,switch, capacitors, transformers, dekapot, andmeter; use sledges, hammers, crowbars, orother heavy tools,
b. Cut. Cut the power and other cords; useaxes, handaxes, or machetes.
c. Burn. Burn cords and technical manuals;use gasoline, kerosene, oil, flame throwers, orincendiary grenades.
d. Bend. Bend panel and case.e. Explode. If explosives are necessary, use
firearms, grenades, or TNT.f. Dispose. Bury or scatter the destroyed
parts in slit trenches, foxholes, or throw theminto streams.
By Order of Wilber M.Brucker, Secretary of the Army:
MAXWELL D. TAYLOR,General, United States
Official: Chief of Staff.HERBERT M. JONES,
Major General, United States Army,The Adjutant General.
Distribution:
Active Army:
A S ACNGBTechnical Svc, DATechnical Svc BdUSCONARCUSA Arty BdUSA Armor BdUSA Inf BdUSA Air Def BdUSA Abn & Elct BdUSA Avn BdUSA Arctic Test BdUSA Armor Bd Test SecUSA Air Def Bd Test SecUSARADCOMOS Maj CoredOS Base CoredLog CoredSW CoredMDWArmiesCorpsDivUSATCFt & CampsSvc CollegesBr Svc SchGen DepotsSigC Sec, Gen Depots
NG: State AG; units-same as Active Army.
USAR: None.
SigC DepotsPOE (OS)Trans Terminal ComdArmy TerminalsOS Sup AgenciesSigC Fld Maint ShopsSigC LabMil DistArmy Sig Comm Engr AgencyArmy Sig Pub AgencyArmy Comm AgencyArmy Sig Pictorial CenEngr Maint CenWRAMCJBUSMCAMSA F I PYUMA Test StaUnits org under fol TOE:
Army,
11-16, Hq & Hq Co, Sig Bn, Corps or Abn Corps11-57, Armd Sig Co11-127, Sig Rep Co11-128, Sig Depot Co11-500, Sig Svc Org11-557, Abn Sig Co11-587, Sig Base Maint Co11-592, Hq & Hq Co, Sig Base Depot11-597, Sig Base Depot Co
For explanation of abbreviations used, see AR 320-50.
30
PIN: 028786-000
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