TM 11-6625-1636-14
Warning
HIGH VOLTAGE is used in the operation of this equipment. DEATH ON
CONTACT may result if personnel fail to observe safety precautions.
Learn the areas containing high voltage in each piece of equipment. Be
careful not to contact high voltage connections when installing or opening this equipment. Before working inside the equipment, turn power off
and ground points of high potential before touching them.
Change
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TM 11-6625-1636-14
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Technical Manual
No. 11-6625-1636-14
*TM 11-6625-1636-14
Chapter 1.
Section I.
Section II.
Chapter 2.
Chapter 3.
Chapter 4.
Section I.
Section II.
Chapter 5.
Chapter 6.
Appendix A.
Appendix B.
Paragraph
1-1
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1-6
1-7
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5-2
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Appendix C.
Section I.
Section II.
C-1
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i
TM 11-6625-1636-14
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number
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LIST OF ILLUSTRATIONS
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LIST OF TABLES
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ii
TM 11-6625-1636-14
Change 1
Figure 1-1. Test Set. Antenna Coupler AN/ARM-109.
1-0
CHAPTER 1
INTRODUCTION
Section I. GENERAL DESCRIPTION
TM 11-6625-1636-14
1-1. Scope
anual provides instructions for the
installation, operation, testing and mechanical
overhaul of the 878L-15 Coupler Control Tester,
the 878L-16 Electronic Control Amplifier Tester,
and the 878L-17 Discriminator Tester. When the
testers are referenced collectively, they will be
referred to as the 878L-15/16/17 module tester, Test
-189.
Set Antenna Coupler AN/A
ntenna Coupler
The test set
CU-1658/A
presented in the
neral description,
es of operation,
maintenance, parts list, and illustrations.
b. The lowest level at which maintenance, other
eventive maintenance, is authorized, is
support; therefore, there are no direct
maintenance procedures.
1-2. Indexes of Publication
a. DA Pam 310-4. Refer to the latest DA Pam
310-4 to determine whether there are new editions,
s, or additional publications pertaining to
the equipment.
10-7. Refer to
her there are
1-3. Maintenance Forms, Records, and
Reports
aintenance and Unsatisfactory
Equipment. Department of the Army forms and
procedures used for equipment maintenance will
be those prescribed by T
38-750, The Army
aintenance Management System.
b. Report of Packaging and Handling Deficien-
cies Fill out and forward DD Form 6 (Packaging
Improvement Report) as prescribed in AR 735-11-
2/NAVSUPINST 4440.127E/AFR 400-54/MCO
4430.3E and DSAR 4140.55.
c. Discrepancy in Shipment Report (DISREP)
(SF 361). Fill out forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in
AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/
MC0 P4610.19C and DLAR 4500.15.
1-4. Reporting Errors and Recommending
Improvements
You can help improve this manual.
If you find any
mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter,
DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 2028-2 located
in back of this manual direct to Commander, US
Army Communications and Electronics Materiel
Readiness Command, ATTN: DRSEL-ME-MQ,
Fort Monmouth, NJ 07703. In either case, a reply
will be furnished direct to you.
1-5. Military Nomenclature and Commercial
Designations
Throughout this manual, equipment commercia1
designations are used. Some of the equipments
have been assigned Military nomenclature; these
are listed in table l-l.
1-1
TM 11-6625-1636-14
Table 1-1. Official Military Nomenclature and
Military nomenclature
Test Set, Antenna Coupler
CoIlins Radio Co. Type No.
Test Set 980H-1
AN/ARM-109
Test Set, Antenna Coupler
Control TS-2353/ARM-109
Test Set, Electronic Control
Amplifier TS-2354/ARM-
Antenna Coupler Control
Tester 878L-15
Electronic Control Amplifier
Tester 878L-16
109
Section II. DESCRIPTION AND DATA
1-6. Description
(fig. 1-1)
a. 878L-15 Coupler Control Tester.
The 878L-15 contains a power supply and
switching matrix necessary to energize control
circuits in the antenna coupler control module
(Collins part number 528-0465-00). The 878L-16
employs lamp comparison and voltage test
points for a go-no-go test of the coupler control
module. A 3-foot extension cable is included to
allow easier troubleshooting since the module
has limited accessibility when mounted on the
test set.
b. 878L-16 Electronic Control Amplifier Tes-
ter.
The 878L-16 provides the inputs necessary to
operate the electronic control amplifier module
(Collins part number 528-0467-00). The 878L-16
employs lamp comparison and torque meter indications for a go-no-go test of the electronic
control amplifier module. Because the module
has limited accessibility when mounted on the
test set, a 3-foot extension cable is included to
permit easier troubleshooting.
Commercial Designations
Military nomenclature
Test Set, Discriminator
TS-2352/AARM-109
Collins Radio Co. Type No.
Discriminator Tester
818L-17
Case, Test Set CY-6173/
ARM-109
c. 878L-17 Discriminator Tester.
The 878L-17 simulates the actual operati
condition under which the discriminator mod
(Collins part number 528-0468-00) o
the antenna coupler. A 50-ohm,
150-watt resistive load simulates a properly matched antenn
coupler and antenna. Reactance switched i
parallel with the resistive load simulates an
unmatched antenna coupler and antenna. The
discriminator error si
als are monitored by a
meter on the front panel of the 878L-17. A 6-foot
coaxial cable is included to connect the tester
RF input to the transmitter.
d. 980H-1 Test Set.
The 98OH-1 consists
plastic carrying case
Antenna Coupler Con
Electronics Control Amplifier Tester, the
878L-17 Discriminator Tester, power panel, and
associated cables.
Note
Any reference in this manual to the
878L-15, 878Lapplies to the
or 878L-17 ah
9
NSN
6625-00-627-8692
1-2
Table 1-2. Items Comprising AN/ARM-109
Nomenclature.
part
No., and mfr rode
Test Set, Antenna Coupler AN/ARM-109 consisting of
NOTE
The part number is followed by the applicable 5-digit Federal supply code for
Manufacturers (FSCM) identified in SB 708-12 and used to identify manufacturer, distributor, or Government agency, etc.
Cable Assembly W-l: 761-4600-001; 13499
Cable Assembly W-2: 761-4400-001; 13499
Cable Assembly W-3: 554-6957-001; 13499
Cable Assembly W-4: 554-6958-001: 13499
Extender printed wiring board Al: 637-1902-001; 13499
Extender printed wiring board A3: 637-1904-001; 13499
Fig. no.
I-1
1-1
1-1
l-l
l-l
l-l
Table 1-3. Equipment Required But Not Supplied
1-7. Tabulated Data
TM 11-6625-1636-14
1-3
TM 11-6625-1636-14
CHAPTER 2
SERVICE UPON RECEIPT OF EQUIPMENT AND INSTALLATION
2-1. Unpacking and Inspecting
This section contains the information required
to unpack, test, and install the testers. Refer to
figures 2-1,2-2,2-3, and 2-4 for installation control drawings. Carefully remove the units from
their wrappings. Save all packing until inspection of the equipment has been completed.
Check for visual defects. The packing material
should be discarded only after the equipment
has been found satisfactory. In case of damage,
a claim must be filed with the shipping company. Such claims ordinarily required the inclusion of packing materials.
2-2. Preinstallation Test
a. 878L-15 Coupler Control Tester.
(1) Apply power (115-vac, 400-Hz single-
phase) to the 878L-15.
Table 2-1. Lighting Sequence of Program Indicators for 878L-15
(2) Set the POWER Switch to ON.
(3) To test the lamps, set the FUNCTION
selector to position 17 and close the KEY switch.
All the indicator lamps should be lighted.
CAUTION
This test must not be made with a con-
trol module connected to the tester.
(4) Set the FUNCTION selector to OFF.
(5) Connect a control module to the 878L-15.
(6) Rotate the FUNCTION selector control
through the 12 test positions and observe the
lighting sequence of the program (amber) lamps.
(Refer to table 2-l for the proper lighting sequence.)
2-1
TM 11-6625-1636-14
Table 2-2.
Table 2-1. Lighting Sequence Program Indicators for 878L-15-Continued
NOTE
2-3.
2-2
TM 11-6625-163-14
Figure 2-1. TS-2353/ARM-109 Test Set Antenna Coupler Control outline and mounting dimension.
Figure 2-2. TS-2354/ARM-109 Test Set, Electronic Control Amplifier
2-3
TM 11-6625-1636-14
2-4
Figure 2-3. 878L-17 Discriminator Tester, outline and movnting
dimensions
TM 11-6625-1636-14
Figure 2-4. 980H-1, Test set, outline and mounting dimensions.
2-5
TM 11-6625-1636-14
Figure
2-5.
Test Set
980H-1
Power Panel, Schematic Diagram.
Figure
2-6. Power Panel Special Cable Assembly W1, Schematic Diagram.
2-6
TM 11-6625-1636-14
Figure 2-7.
2-7
TM 11-6625-1636-14
2-8
Figure 2-8. 878-16
Figure 2-9.
Special Cable Assembly W3, Schematic Diagram
878L-17
Special Cable Assembly W4, Schematic Diagram.
CHAPTER 3
OPERATING INSTRUCTIONS
TM 11-6625-1636-14
3-1. General
This section describes the function of the controls and indicators of the 878L-15/16/17 module
testers. Test set operating procedures are also
contained within this section.
3-2. Operating Controls
a. 878L-15 Antenna Coupler Control Tester
Operating Controls.
Table 3-l contains a description of the 878L-15
operating controls.
b. 878L-16 Electronic Control Amplifier Tester
Operating Controls.
Table 3-2 contains a description of the 878L-16
operating controls.
c. 878L-17 Discriminator Tester Operating
Controls.
Table 3-3 contains a description of the 878L-17
operating controls.
d. 980H-1 Power Panel Operating Controls.
Table 3-4 contains a description of the 980H-1
operating controls.
3-3. Operating
Procedures
Subparagraphs a, b, and c contain operating procedures for the testers.
a. 980H-1 Test Set Operating Procedures.
(1) Connect power cable to a 115-vac, 400-Hz,
single-phase power source.
(2) Set POWER
switch S1 to ON position.
(3) Proceed to paragraph 3-3b, c, or d for
applicable tester operation.
NOTE
Individual tester power cables are connected to the power source through the
980H-1 power panel; therefore, omit (1)
in 878L-15 operating procedures (para
3-3b) and (2) in 878L-16 operating procedures (para 3-3c).
b. 878L-15 Antenna Coupler Control Tester
Operating Procedures.
Figure 3-1. TS-2353/ARM-109, operating controls identification.
3-1
TM 11-6625-1636-14
Figure 3-2. TS-2352/ARM-109 Operating controls identification.
3-2
Figure 3-3. TS-2352/ARM-109 Operating control Identification.
TM 11-6625-1636-14
(1) Connect the 878L-15 to a 115-vac,
z single-phase power source.
(2) Connect a coupler control module to front
panel of the 878L-15. To facilitate testing or
troubleshooting, the module may be connected to the
887L-15 by the pendant cable. Extender cards may
be used to extend tune sequence cards Al and A3 for
easier accessibility.
NOTE
odule must be firmly fastened to the
878L-16 or pendant cable to insure
proper grounding of module.
(3) Set POWER switch to ON.
(4) Complete troubleshooting procedures
outlined in applicable antenna coupler manual.
c. 878L-16 Electronic Control Amplifier Tester
Operating Procedures.
(1) Set FUNCTION selector (S1) and
POWER switch (S2) to OFF.
(2) Connect 878L-16 to a 115-vac, 400-Hz
single-phase power source.
(3) Connect an electronic control amplifier
module to the 878L-16. The module may be connected to the 878L-16 with the S-foot pendant
cable to facilitate testing or troubleshooting.
NOTE
The module must be securely mounted
to the 878L-16 or pendant cable to insure proper grounding of the module.
(4) Set the POWER
switch (S2) to SELF
TEST. TORQUE METER should indicate approximately 0.4 inch-ounce and all lamps should
be lighted. If proper indications are not obtained
refer to maintenance section of this manual.
(5) Set POWER
switch (S2) to ON.
(6) Complete troubleshooting procedures
outlined in applicable antenna coupler manual.
d. 878L-17 Discriminator Tester Operating
Procedures.
CAUTION
Observe the duty cycle for the 878L-17
(5 minutes on, and 5 minutes off).
(1) Connect transmitter output of J1 of the
878L-17.
(2) Plug a loading-phasing discriminator
module (Collins part number 528-0468-60) into
J2, J3, and J4 of the 878L-17.
(3) Set tran
smitter for a 100-watt output.
(4) Complete troubleshooting procedures
outlined in applicable antenna coupler manual.
Table 3-1. Description of 878L-15 Operating Control8
Table 3-2.
Description
of
878L-16 Operating Controls
I
3-3
TM 11-6625-1636-14
Table 3-2.
Description of 878L-16 Operating Controls-Continued.
3-4
TM 11-6625-1636-14
Table 3-3. Description of 878L-16 Operating Controls-Continued
Table
Description of 887L-17 Operating Controls
3-3.
3-5
TM 11-6625-1636-14
Table 3-3. Description of 878L-17 Operating Controls-Continued
3-6
Figure
3-4. AN/ARM-109 Power Panel, Operating Controls Identification.
Table 3-4. Description of Power Panel Operating Controls
CHAPTER 4
ORGANIZATIONAL MAINTENANCE
Section I. GENERAL
TM 11-6625-1636-14
4-1. Scope of Maintenance
The maintenance duties assigned to the organizational electronic equipment repairman are
listed below together with a reference to the
paragraphs covering the specific maintenance
functions. The duties include instructions for
performing preventive and corrective maintenance and do not require tools or test equipment
other than those allocated.
a. Cleaning (para 4-5).
b. Organizational preventive maintenance
checks and services (para 4-4).
Section II. PREVENTATIVE MAINTENANCE PROCEDURES
4-3. Preventive Maintenance
Preventive maintenance is the systematic care,
servicing, and inspection of equipment to prevent the occurrence of trouble, to reduce out-ofservice time, and to maintain equipment serviceability.
a. Systematic Care. The procedures given in
paragraphs 4-4 and 4-5 cover routine systematic care and cleaning essential to proper upkeep
and operation of the equipment.
b. Preventive Maintenance Checks and Ser-
vices. The preventive maintenance checks and
services chart (para 4-4) outlines the functions
to be performed at specific intervals. These
checks and services are designed to maintain
Army equipment in a combat-serviceable condi-
c. Removal and replacement of control anit
panel lamps and knobs.
4-2. Tools, Test Equipment, and Materials
The tools, test equipment, and materials required are listed belo .
a. Tool Kit, Electronic Equipment TK-101/G.
b. Multimeter AN/URM-105.
c. Fine sandpaper, No. 0000.
d. A soft-bristled brush.
e. A clean lint-free cloth.
f. Trichloroethane.
tion; that is, in good general (physical) condition
and in good operating condition. To assist organizational maintenance repairmen in maintaining combat serviceability, the chart indicates what to check, how to check, the normal
conditions; the time required to perform the
checks and services isshown as man-hours in
the work time colum of the defect cannot be
remedied by the organizational maintenance
repairman, higher category of maintenance is
required. Records and reports of these checks
must be made in accordance with TM 38-750.
4-4. Organizational Preventive Maintenance
Checks and Services
Q-Quarterly
Total man-hours required: 0.9
ITEM TO BE INSPECTED
PROCEDURE
1
EXTERIOR SURFACES
a. Clean front panels.
b.
Inspect exposed metal surfaces for rust, corrosion, and bare spots.
CABLES AND CONNECTORS
2
Check interconnecting cables for cuts, kinks, and frayed insulation. Repair as necessary.
Refer to high echelon for replacement.
3
MOUNTING
a. Check equipment for proper installation.
b.
All nuts, bolts, and washers are present and properly tightened.
c.
4
Mounting shows no sign of weakness or deformity.
PRELIMINARY OPERATION
a. Check Antenna Coupler Control Tester 878L-15 for proper functioning (para 2-2a).
I
b. Check Electronic Control Amplifier Tester 878L-16 for proper functioning (para 2-2b).
I
c. Check Discriminator Tester 878L-17 for proper functioning (para 2-2c).
.- -.,\
Work-time
(M/H)
!
0.1
0.1
0.1
I
I
4-1
TM 11-6625-1636-14
4-5. Cleaning
All exterior surfaces of the equipment should be
free of dirt, grease, and fungus. Perform the
following procedures as specified in the preventive maintenance checks and services charts.
a. Remove moisture and loose dirt with a clean
soft cloth.
Warning
The fumes of trichloroethane are toxic.
Provide thorough ventilation whenever used. DO NOT use near an
open flame. Trichloroethane is not
flammable, but exposure of the fumes
to an open flame converts the fumes to
highly toxic dangerous gases.
b. Remove grease, fungus, and ground-in dirt
from the exterior surfaces with a clean
dampened (not wet) with trichloroethane.
cloth
Wipe
dry with a clean, dry, lint-free cloth.
c. Clean the front panel and controls; use a
clean soft cloth. If dirt is difficult to remove,
dampen the cloth with water; if necessary, use
mild soap.
d. Remove rust and corrosion from metal surfaces by lightly sanding them with
fine
sandpaper. Brush two thin coats of paint on the
bare metal to protect it from further corrosion.
Refer to the applicable cleaning and refinishing
practices specified in TB 43-0118.
4-2
TM 11-6625-1636-14
CHAPTER 5
FUNCTION OF EQUIPMENT
5-1. Electronic Functioning
This chapter contains the detailed electronic
functioning of the 878L-15/16/17 module test set
circuitry.
5-2. Antenna Coupler Control Tester
Circuit Analysis
a. Transformer T1 provides the necessary
operating voltages to the antenna coupler control module under test. The antenna coupler
control module provides the filtered 28 volts dc
necessary for the operation of indicator lamp
circuits and testing circuits of the 878L-15. The
diode switching matrix completes the circuit for
the proper program (amber) lamps and energizes the proper antenna coupler control module
circuits for each position of the FUNCTION
selector.
b. When the FUNCTION selector is in position
3, the discharge of antenna coupler control
capacitor C24 (series and shunt varicoil homing
volts) gates silicon controlled rectifiers (scr’s)
CR3 and CR4 into conduction. The operation of
an scr is similar to that of a thyratron. An scr
conducts with proper anode voltage and proper
gate current. The gate current may be removed
and the scr continues to conduct until the anode
voltage is decreased below the holding voltage
of the ser. Silicon controlled rectifiers CR3 and
CR4 are employed to insure the illumination of
DS1-31 and DS2-22 until the FUNCTION selector is conditioned to a different test position.
c. The circuit composed of resistor Rl, capacitor
Cl and FUNCTION selector S2E front and rear
provides the 400-Hz signal necessary to ener-
gize the series varicoil maximum sense and the
series varicoil minimum sense circuits in the
antenna coupler control. The 400-Kz input is
phase-shifted slightly by the differential circuit
Rl and Cl. This phase shift compensates for the
phase shift of the servoamplifier chopper during
normal antenna coupler operation. The magnitude of the 400-Hz signal may be monitored
by an ac vtvm connected to jacks P2-20 and
P2-30. Adjustment of the SERIES SERVO con-
trol (Rl) varies the 400-Hz output. The 400-Hz
output phase is reversed by switches S2E, front
and rear.
d. The circuit composed of resistor R2,
capacitor C2, and switches S2D front and rear
provides the 400-Hz signal necessary to energize the loading on the 50 circuit in the antenna coupler control. The 400-HZ input is
phase-shifted slightly by differential circuit R2
and C2. This phase shift compensates for the
phase shift of the servoamplifier chopper during
normal antenna coupler operation. The magnitude of the 400-Hz signal may be monitored by
an ac vtvm connected to jacks P1-13 and P2-36.
Adjustment of the SHUNT SERVO control (R2)
varies the 400-Hz output. The 400-HZ output
phase is reversed by switches S2D, front and
rear.
e. Relay K1 is energized when the FUNCTION selector is in position 17 and the KEY
button is depressed. Relay K1 forward biases
diodes in the matrix and on TB1 completing all
lamp circuits. Voltage across terminals 4 and 6
of transformer T1 is rectified by diodes CR1 and
CR2 to provide the +28 volts dc for the lamp
circuits.
5-3. Electronic Control Amplifier Tes-
ter Circuit Analysis
a. The negative portion of the 400-Hz output
from transformer Tl is rectified by CR3, filtered
by C9, R2, C2, and R3, and regulated by CR7.
This dc voltage simulates a negative error signal from the phasing and loading discriminator.
The positive portion of the 400-Hz output from
transformer Tl is rectified by CR4, filtered by
C7A, R4, C7B, and R5, and regulated by CR8.
This dc voltage simulates a positive error signal
from the phasing and loading discriminator.
b. Full-wave rectifiers CR1 and CR2 provide a
28-volt dc supply used for the lamp circuits and
to energize relays in the module under test.
c. The FUNCTION selector controls the oper-
ation of the amplifier and relay circuits in the
module under test. It also controls the power to
the 878L-16 (amber) lamps. The TORQUE
METER monitors the operation of the servoamplifiers, and the indicator lamps monitor
the operation of the rf relay switch, the gain
relay, and the tune B damping relay in the electronic control amplifier.
5-1
TM 11-6625-1636-14
elay K1 provides the ground necessary
for conduction of electronic control amplifier
band information scr’s Q14 and Q15.
e. The operating controls in table 3-2 describe
the inputs and electronic control amplifier circuits under test for each position of the 878L-16
FUNCTION selector.
5-4. 878L-17 Discriminator Tester Circuit
Analysis
Hz through 30MHz)
positions of the CIRCUIT SELECTOR place
reactive elements in parallel with the 50-ohm
resistive load to simulate an antenna of improper length with a 50-ohm resistive component.
The discriminator module under test developes
a dc error signal proportional to the RF line
voltage and RF line current phase shift created
the parallel reactive and resistive circuit.
TER Ml provides an indication proportional
to the magnitude of the dc error signal. Measurement of the phasing error signal provides
an accurate test of the operation of the phasing
discriminator.
b. The PHASE position of the CIRCUIT
SELECTOR places the 50-ohm resistive load
into the RF circuit. Resistor R9 in the discriminator under test may then be adjusted for
a zero error signal output.
c. When the CIRCUIT SELECTOR is in the
INPUT POWER position a power detector is
placed in parallel with the 50-ohm load. This
action permits monitoring of the RF power output of the transmitter.
d. When the CIRCUIT SELECTOR is in the
LOAD position, the 50-ohm resistive load is
switched into the rf circuit and the loading error
signal from the discriminator under test is
switched into the meter signal. The loading discriminator developes a dc error signal proportional to the difference between the line resistance and 50 ohms. Capacitor C4 in the discriminator under test should be adjusted for a
zero error signal output.
e. When the CIRCUIT SELECTOR is in the
FWD POWER position, the 50-ohm resistive
load is switched into the RF circuit and the for-
ward power error signal from the discriminator
under test is switched into the METER circuit.
The forward power discriminator developes a dc
error signal proportional to the forward power
of the transmitted signal. The magnitude of this
error signal is indicated on the 878L-17 METER.
f. When the CIRCUIT SELECTOR is in the
REFL POWER position, the 50-ohm resistive
load is switched into the RF circuit and the reflected power error signal from the dis-
criminator under test is switched into the meter
circuit. The magnitude of this error signal is
indicated on the 878L-17 METER.
g. When the CIRCUIT SELECTOR is in the
REFL SENS position, a 500-ohm resistance is
switched in parallel with the 50-ohm load and
the resistance combination switched into the
RF circuit. The reflected power error signal
from the discriminator under test is switched
into the meter circuit. Due to the parallel resistance configuration the transmitter load resistance is less than 50 ohms; therefore, the magnitude of the reflected power error signal is increased.
The algebraic difference between the
error signal developed when the load is 50 ohms
and the error signal developed with the load
deviates from 50 ohms in the power sensitivity.
Due to the analog readout of the 878L-17 the
reflected power sensitivity need not be calculated.
h. When the CIRCUIT SELECTOR is in the
LOAD SENS position, a 500-ohm resistance is
switched in parallel with the 50-ohm load and
the resistance combination switched into the
RF circuit. The loading error signal from the
discriminator under test is switched into the
meter circuit. Due to the parallel resistance configuration the transmitter load resistance is less
than 50 ohms; therefore, the magnitude of the
loading error signal is increased. The algebraic
difference between the error signal developed
when the load is 50 ohms and the error signal
developed with the load deviates from 50 ohms
in the load sensitivity. Due to the analog readout of the 878L-17, the load sensitivity need not
be calculated.
5-2
CHAPTER 6
GENERAL SUPPORT MAINTENANCE
TM 11-6625-1636-14
6-1. Troubleshooting Data
This chapter contains the information required
for the general support maintenance of the
878L-15/16/17 module tester. This chapter contains minimum performance procedures, trout
leshooting procedures, typical voltage charts
and preventive maintenance routines. Refer to
table 6-l for test equipment required to maintain 878L-15/16/17 module tester.
WARNING
Be extremely careful when troubleshooting the internal circuits of the
receiver-transmitter unit; dangerous
voltages exist in the unit. Always disconnect the equipment from the power
source when making internal repairs
or resistance measurements.
a. Organization of Troubleshooting Proce-
dures. The first step in troubleshooting a defec-
tive radio set is to sectionalize the fault. Sectionalization means tracing the fault to a major
component. The second step is to localize the
fault. Localization means tracing the fault to a
circuit or module. The third step is to isolate the
fault. Isolation means tracing the fault to a defective part responsible for the abnormal condition. Some faults such as burned-out resistors,
arcing or shorted transformers can often be lo-
cated by sight, smell, and hearing. The majority
of faults, however, must be isolated by checking
voltages and resistances.
b. Sectionalization. Listed below is a group of’
tests arranged to reduce unneccessary work and
to aid in tracing trouble in a defective test set.
Test Set, Antenna Coupler AN/ARM-109 consists of three units: the antenna coupler control,
electronic control amplifier, and discriminator
tester. The first step is to locate the unit or units
at fault by the following methods:
(1) Visual inspection. The purpose of visual
inspection is to locate faults without testing or
measuring circuits. The monitor meter on the
front of the receiver-transmitter and other visual signs should be observed and an attempt
made to sectionalize the fault to a particular
unit.
(2) Operational tests. Operational tests fre-
quently indicate the general location of trouble.
In many instances, the tests will help in determining the exact nature of the fault. The
periodic preventive maintenance checks and
services is a good operational test.
C. Localization. After the trouble has been sec-
tionalized (b above), the methods listed below
will aid in localizing the trouble to a circuit or
module in the suspected unit.
(1) Troubleshooting charts. The trouble sym-
toms in the troubleshooting charts (table 6-5)
provide additional information for localizing
troubles.
d. Isolation. After the trouble has been
localized (c above), the methods listed in (1)
through (5) below aid in isolating the trouble to
a defective circuit element.
(1) Waveform analysis. For some circuits in
this equipment, waveforms must be taken and
compared with the waveforms given. Resistance
measurements ((3) below) must then be taken to
isolate the trouble.
(2) Voltage measurements. Portions of this
equipment are transistorized. When measuring
voltages, use tape or sleeving (spaghetti) to insulate the entire test prod, except for the ex-
treme tip. A momentary short circuit can ruin a
transistor. Use the same or equivalent item of
test equipment specified in the procedures.
(3) Resistance measurements. Make resis-
tance measurements in this equipment only as
directed. Use the test equipment range specified
in the procedures, otherwise the indications obtained may be inaccurate.
CAUTION
Before using any item of test equipment to test transistors or transistor
circuits, check the open-circuit voltage
across the test equipment leads. Do not
use the test equipment if the open-
circuit voltage exceeds 1.5 volts. Also,
since the RX1 range normally connects
the test equipment internal battery di-
rectly across the test leads, the comparatively high current (50 MA or
more) may damage the transistor
6-1
TM 11-6625-1636-14
under test. As a general rule, it is not
recommended that the RX1 range of
test equipment be used when test-
low-power circuits.
(4) Test points. Some of the modules of this
equipment are equipped with test points to
facilitate connection of test equipment. These
test points should be used whenever specified to
avoid needless disassembly of the equipment.
(5) Intermittent troubles. In all of the tests,
the possibility of intermittent troubles should
not be overlooked. If present, this type of trou-
ble often may be made to appear by tapping or
jarring the equipment. Make a visual inspection
of the wiring and connections to the units of the
equipment. Minute cracks in printed circuit
boards can cause intermittent operation. A
magnifying glass is often helpful in locating defects in printed circuit boards. Continuity mea-
surements of printed conductors may be made
using the same technique ordinarily used on
hidden conventional wiring; observe test
equipment precautions discussed in (3) above.
6-2. 878L-15 Antenna Coupler Control Tester
a. Minimum Performance. The minimum per-
formance test for the 878L-15, described in table
6-2 consists of a series of tests performed on the
test bench. Successful completion of the tests
will insure that the unit is functioning within
acceptable limits of performance.
b. Troubleshooting Chart. A troubleshooting
chart for the 878L-15, is provided in table 6-5.
Fault indication is based on trouble encountered during minimum performance tests. The
test steps of the troubleshooting chart are arranged in the same sequence as the test steps in
the minimum performance test. If a fault occurs
during minimum performance test, refer to the
corresponding step in the troubleshooting chart
to determine probable cause and remedy.
Table 6-1. Test Equipment Required
Common name Nomenclature
AC vtvm (Hewlett-Packard
Voltmeter, Meter ME--26B/U
410B)
DC vtvm (Fluke 801B, 0.3
volt within 0.5%)
Vom (Triplett 630)
Impedance bridge (Boonton
250A)
Voltmeter, Electronic AN/
USM-98
Multimeter TS-352B/U
Test Set, Capacitance-
Inductance Resistance
AN/URM-90
Ohmmeter Hewlett-
Voltmeter. Meter ME-26B/U
Packard 410B)
Step No.
6-2
Description of test
1
Lamp test.
Program (amber)
test.
Table 6-2.
lamp
878L-15 Antenna Coupler Control Tester Minimum Performance Test
i
Test equipment Control Settings and instructions
None.
POWER switch in ON posi- All indicator lamps must be
tion and FUNCTION
Required Indication
lighted.
selector in position 17.
Press KEY button.
i
NOTE
This test must not
be performed with a
coupler
module connected
control
I
to the 878L-15.
NOTE
The KEY push-
button must be depressed in positions
3, 4, 7, 8, and 12
every
time
the
FUNCTION selec-
tor is in these
posi-
tions (even when
just
-None.
going
them) for the test to
work.
POWER switch in ON posi Refer to table 2-1.
tion and FUNCTION se-
lector rated through the
12 test positions.
I
past
NOTE
There will be no indication if the cou-
pler control module
Table 6-2.
TM 11-6625-1636-14
878L-15 Antenna Coupler Control Tester Minimum Performance Test-Continued
6-3
TM 11-6625-1636-14
Table 6-2.
Table 6-3.
878L-15 Antenna Coupler Control Tester, Diode
Matrix
Ground Test
NOTE
An X indicates continuity
between
GRD jack and listed terminal, and a blank indicates infinite resistance.
The numbers are resistances in ohms where continuity is not a short.
6-4
TM 11-6625-1636-14
Table 6-4.
878L-15 Antenna Coupler Control Teeter, Diode Matrix 28-VDC Test
An X indicates continuity between J2-29 and the listed terminal, and a
The numbers are resistances in ohms where continuity is not a short.
Table 6-5. 878L-15 Antenna Coupler Control Tester, Troublshooting Chart
NOTE
blank indicates infinite resistance.
6-5
TM 11-6625-1636-14
Table 6-5. 838L-15 Antenna Coupler Control Tester, Troubleshooting
Chart-Continued
6-6
Table 6-5.
878L-15 Antenna Coupler Control Teeter, Troubleshooting
Chart-Continued
TM 11-6625-1636-14
6-3. 878L-16 Electronic control Amplifier Tes-
ter
a Operational Test. The operational test for
the 878L-16 is performed to insure that the indicator lamps and lamp circuits are functioning
properly. The operational test procedures are
described below.
(1) Set FUNCTION selector (S1) to OFF.
(2) (Set power switch (S2) to SELF TEST.
(3) All indicator
lamps should be lighted
and the TORQUE METER should indicate ap-
proximately 0.4 inch-ounce.
b. Minimum Performance Test. The minimum
performance test for the 878L-16, described in
table 6-6, consists of a series of tests performed
on the test bench. Successful completion of the
test will insure that the unit is functioning
within acceptable limits of performance.
c. Troubleshooting Chart. A troubleshooting
chart for the 878L-16 is provided in table 6-7.
Fault indication is based on trouble encountered during the minimum performance and op
erational tests. The test steps of the troubleshooting chart are arranged in the same
sequence as the test steps in the minimum per-
formance test. If a fault occurs during minimum
performance test refer to the corresponding
step in the troubleshooting chart to determine
probable cause and remedy.
d. Calibration. Subparagraphs (l), (2), and
(3) below describ
e calibration procedures for the
878L-16. No adjustment or calibration procedures are required beyond those described.
NOTE
The 878L-16 must be connected to a
115vac, 400-Hz single-phase power
source for the following adjustments.
(1) Negative Error Adjustment. Establish
the proper operating setting of negative error
potentiometer R10, as follows:
(a) Set power switch (S2) to ON.
(b) Set FUNCTION selector to position 1.
(c) Adjust R10 for 0.212 ±0.01 volt dc at
pin 33 of Jl.
(2) Positive Error Adjustment. Establish
the proper operating setting of positive error
potentiometer R11, as follows:
(a) Set power switch to ON.
(b) Set FUNCTION selector to position 3.
(c) Adjust R11 for 0.100 ±0.01 volt dc at
pin 30 of J1.
(3) TORQUE METER Adjustment. Calib-
rate the TORQUE METER as follows:
(a) Set FUNCTION selector (S1) to Off.
(b) Set power switch (2) to SELF TEST.
(c) Adjust position of spring on the motor
plate for a total pointer deflection of 8 ±1 units
(0.4 ±0.05 inch-ounce).
(d) Set power switch (S2) to OFF.
(e) Lossen four screws that secure motor
plate to the mounting posts.
(f) Position motor plate for a zero pointer
indication.
(g) Loosen pointer and position for zero
indication if motor plate cannot be rotated to
zero.
(h) Repeat (b) through (f) above.
6-7
TM 11-6625-1636-14
Table 6-6.
878L-16 Electronic Control Amplifier Tester, Minimum Performance Test
6-8
Table 6-6.
TM 11-6625-1636-14
6-9
TM 11-6625-1636-14
Table 6-7.
Table 6-6. 878L-16 Electronic Control Amplifier Tester,
Minimum
Performance
Test-Continued.
6-10
TM 11-6625-1636-14
Table 6-7. 878616 Electronic Control Amplifier Teeter, Troublehooting
Chart-Continued
6-11
TM 11-6625-1636-14
Table 6-7. 878L-l6 Electronic Control Amplifier Tester, Troubleshoting Chat-Continued
6-12
TM 11-6625-1636-14
Table 6-7. 878L-16 Electronic Control Amplifier Test Troubleshooting Chart--Continued.
6-13
TM 11-6625-1636-14
Table 6-7. 878L-16 Electronic Control Amplifier Teeter,
Troubleshooting Chart-Continued
6-14
Table 6-7. 878L-16
Electronic
Control
Amplifier Tester, Troubleshooting
TM 11-6625-1636-14
Chart-Continued
6-15
TM 11-6625-1636-14
Table 6-7. 878L-16 Electronic Amplifier Tester, Troubleshooting Chart-Continued
6-16
TM 11-6625-1636-14
6-4. 878L-17 Discriminator Tester
a. Minimum Performance Test. The minimum
performance test for the 878L-17, described in
table 6-8, consists of a series of tests performed
on the test bench. Successful completion of the
tests will insure that the unit is functionin
within acceptable limits of performance.
b. Troubeshooting Chart. A troubleshootin
chart for the 878L-17 is provided in table 6-9.
Fault indication is based on trouble en-
countered during the minimum performance
tests. The test steps of the troubleshooting
chart are arranged in the same sequence as the
test steps in the minimum performance test. If
fault occurs during minimum performance test
refer to the corresponding step in the troubleshooting chart to determine probable cause
and remedy.
c. Calibration. Subparagraphs (1) and (2)
below provide calibration procedures for 878L-
17 Discriminator Tester. No adjustment or
calibration procedures are required beyond
those described.
(1) Input power adjustment. Establish the
proper operatin
level of input power poten-
tiometer R2 as follows:
(a) Set CIRCUIT SELECTOR to INPUT
POWER.
(b) Connect a coaxial jumper from J2 to J3.
(c) Connect transmitter output to Jl and
adjust transmitter frequency to 2
(d) Key the transmitter and adjust for 70-
volt RF output.
(e) Adjust R2 for a METER indication of 7
units.
(2) LOAD adjustments. Establish the proper
operating level of capacitor C7 as follows:
(a) Set CIRCUIT SELECTOR to P
(6) Connect impedance bridge of J3.
(c) Adjust C7 for zero capacitance indica-
tion when dust cover is in place.
6-16.1
TM 11-6625-1636-14
Table 6-8. 878L-17 Discriminator Tester, Minimum Performance
Test
6-17
TM 11-6625-1636-14
Table 6-9.
Table 6-8. 878L-17 Discriminator Tester, Minimum Performance Test-Continued
6-18
TM 11-6625-1636-14
Table 6-9. 878L-17 Discriminator Tester, Troubleshooting
Chart-Continued
6-19
TM 11-6625-1635-14
6-5. Troubleshooting and Repair of Transis-
torized Circuits
troubleshooting a
ts, observe the foll
s. Therefore,
any deviation in the
characteristics of a certain stage can
be reflected back to affect the operation of the
preceding stages.
b. Common-emitter transistor amplifiers have
a 180-degree phase shift between the input and
output voltages. However, there will be no
phase shift between the input and output signals if the base is shorted to the collector of the
transistor.
c. The dc base voltage should be slightly
higher than the emitter voltage during normal
operation of a common-emitter transistor
amplifier. However, an open circuit between the
base and the emitter of the transistor will result
in the emitter voltage approximating ground
potential and a base voltage considerably greater than normal.
d. An unusually high dc collector voltage can
be caused by an open emitter circuit, an open
collector circuit, or a short between the base and
the emitter of the transistor. However, an open
circuit between either the base and the emitter
or in the load impedance of the stage under con-
sideration will also cause an unusually high dc
collector voltage.
e. An unusually low dc collector voltage indicates a short circuit between the collector and
ground, the collector and the emitter, the collector and the base, or across the output impedance.
(1) An unusually low collector voltage re-
sults when a transistor switch is activated.
Therefore, when +28 volts dc is applied to the
base circuit of Q3, Q5,
or Q7 in the coupler
control module, the co1 or voltage should be
nearly zero.
en checking the base-to-emitter resis-
(2)
tance of the npn type of transistor, the ground of
the voltohmyst must be connected to the emitter lead. The resistance indicated on the RX1
scale then should be eater than 10 ohms but
less than 50 ohms. However, when the meter
leads are reversed, the indicated emitter-to-
e resistance will be several thousand times
ater.
en soldering transitor leads to termi-
(3)
nal points, use the same precautions normally
followed when working with crystal diodes.
6-20
CAUTION
When soldering transistor leads, use
pliers as I heat sink by holding them
between the transistor and the point of
heat application to divert the heat from
the transistor.
f. Use a 35-watt iron to solder or unsolder all
connections except ground connections made
directly to the chassis. For ground connections
to a chassis, use a l00-watt iron.
Table 6-10.
Typical Electronic Control Amplifier
Transistor Voltage
Transistor
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Base
5.1
1.2 0.5
22.0
22.0
23.0
23.0 23.0 23.0
5.1
1.2 0.5
22.0 23.0
22.0
23.0
23.0 23.0
Emitter
0
Collector
14.0
12.0
23.0 30.0
23.0 30.0
23.0 23.0
0
14.0
12.0
30.0
23.0
30.0
23.0 23.0
23.0
NOTE
These measurements made with the 878L-16 func-
tion selector in position 5.
6-6. Cleaning of Dismantled Module Tester
a. General. Wherever practical, instructions
are given for cleaning the dismantled 878L-51
16/17 module tester. Instructions are in tabular
form, arranged to facilitate reference by paragraph to the procedure for cleaning the various
parts. All parts requiring particular methods of
cleaning are considered separately, and part
which are similar enough to permit identical
cleaning procedures are grouped. The use of the
word solvent in the following procedures means
Turcosol or Stoddard solvent. Other materials
required: chamois skin, lint-free cloth, deter-
gent powder, lens tissue paper, bearing cleaning
machine.
WARNING
Perform operation involving cleaning
solvent under a ventilated hood. Avoid
breathing solvent vapor and fumes;
wear a suitable mask when necessary.
Avoid continuous contact with the solvent. Use goggles, gloves, and apron to
prevent irritation due to prolonged
contact. Change clothing that has become saturated with solvent.
TM 11-6625-1636-14
b. References to air jet in this section indi-
cates a hand-operated air nozzle supplied with
clean and dry compressed air at a pressure of 28
pounds per square inch maximum.
WARNING
Wear goggles when using the air jet to
blow dust and dirt from equipment
parts. Warn other persons away from
hazardous area of working enclosure.
6-7. Cleaning Procedures
Subparagraphs a through j below contain in-
structions and procedures for cleaning the various parts of the dismantled 878L-15/16/17 module tester.
a. Cables, Covered.
(1) Clean outer surfaces of vinylite conduit
by wiping dirt from surfaces with a solventmoistened lint-free cloth.
(2) Wipe dry using a clean, dry, lint-free
cloth.
(3) Treat any connector terminations directed in c. below. Wipe lug terminations clean
with
a solvent-moistened, line-free cloth. Dry
with a clean, dry, lint-free cloth.
b. Chassis, Wired. The following cleaning pro-
cedures should be used for chassis containing
terminal boards, resistor and capacitor assemblies, RF coils, switches, inductors, transformers,
and other wired parts.
(1) Remove d
t
us and dirt from all surfaces,
including parts and wiring, using soft-bristled
brushes
in conjunction with an air jet.
CAUTION
Avoid air-blasting small coils, leads,
and other delicate parts by holding air
jet nozzle too close. Be careful when
using brush on delicate parts.
NOTE
When necessary to disturb the dress
of wiring and cables, dressing should be
noted,
and wiring and cables restored
to positions and dress after cleaning is
completed.
(2) Clean jacks as instructed in e below.
(3) With minimum disturbance of wiring,
clean connectors as instructed in c below.
(4) Clean wafer switches as instructed in j
below.
(5) Complete chassis cleaning by wiping
down all finished surfaces with a solvent-
moistened, lint-free cloth.
(6) Dry and polish these surfaces, using a
dry, clean, lint-free cloth.
(7) Protect the chassis from dust, moisture,
and damage, while awaiting inspection.
c. Connectors.
(1) Wipe dust and dirt from bodies, shells,
and cable clamps, using a solvent-moistened,
lint-free cloth. Wipe dry with a clean, dry, lintfree cloth.
(2) Remove dust from inserts using a small,
soft-bristled brush and the air jet.
(3) Wash
dirt and any traces of lubricant
from inserts insulation, and contacts using a
solvent applied sparingly with a small, camel’shair brush.
CAUTION
Do not allow solvent to run into sleeves
or conduit covering any wires or cables
connected to contract terminals of the
inserts.
(4) Dry the insert with air jet.
d. Covers. Clean all dust covers as follows:
(1) Remove bulk or surface grease with rags.
(2) Blow dust from surfaces, holes, and re-
cesses using the air jet.
(3) Immerse cover in washing bath of solvent, and scrub until clean. Work over all surfaces and into all holes and recesses with a suitable nonmetallic brush. Flat, wood-backed
brushes with soft fiber bristles are recommended for flat surfaces; round brushes (similar
to those used for washing bottles and test tubes)
are recommended for holes and recesses.
(4) Raise the cover from the bath, and per-
mit solvent to drain into bath.
(5) Immerse in rinsing bath of cleaning sol-
vent, rinse, and raise from bath. Position the
cover to drain dry so that solvent is not trapped
in holes or recesses. When practical positioning
will not permit complete draining, use the air jet
to blow out any trapped solvent.
(6) When thoroughly dry, touch up any
minor damage to finish. Extensive damage to
finish may require complete refinishing.
(7) Protect the cover from dust and moisture
while awaiting inspection.
e. Jacks.
(1) Remove dust from exteriors with a
camels-hair brush and the air jet.
(2) Blow dust from interior of female contact
with the air jet.
6-21
TM 11-6625-1636-14
achined Metal Parts. Detached shafts,
keys, pins, spring and similar machined parts
should be cleaned in suitable cleaning machine,
if available, otherwise, proceed as follows:
(1) Remove bulk or surface grease with rags.
(2) Immerse part in washing bath of solvent,
and scrub until clean, working over all surfaces
and into all holes and recesses with a suitable
nonmetallic brush. Flat, wood-backed brushes
with soft fiber are recommended for surfaces; round brushes, similar to those used for
washing bottles and test tubes, are recom-
mended for holes and recesses.
(3) Raise th
e casting from the bath, and
permit solvent to drain into bath.
(4) Immerse in rinsing bath of cleaning solvent, rinse, and raise from bath. Position the
casting to drain dry so that solvent is not trapped in holes or recesses. When practical positioning will not permit complete draining, use
the air jet to blow out any trapped solvent.
Caution
To prevent corrosion, avoid touching
with bare hands any machined or nonfinished surfaces after cleaning.
(5) Dry in dust-free, dry area, or suitable
enclosure. Radiant heat used in a ventilated enclosure is recommended for drying, particularly
where atmospheric humidity is high.
(6) Apply a light coat of MIL-L-7870 lubricating oil to any bare steel surface immediately when dry.
g. Mechanical Metal Parts. The detached mis-
cellaneous
mechanical metal parts include
mounting plates, mounting clamps and brackets, nuts, bolts, screws, washers, handles, fasteners, and hardware. These should be cleaned
in suitable cleaning machine or according to
applicable steps of precedures for covers (d
above).
h. Molded Plastic Parts. Plastic parts include
insulating members, spacers, mounting blocks,
etc. Clean these as follows:
(1) Blow lo
ose dust and dirt from surfaces,
holes, and crevices with an air jet.
(2) Wipe clean using a solvent-moistened,
lint-free cloth.
(3) Dry and polish with a clean, dry, lint-free
cloth.
i. Printed Circuit Boards.
(1) Blow and
b
rush dust and dirt from surfaces, holes, and crevices using an air jet and a
small camel’s-hair brush.
(2) Wipe clean using a lint-free cloth slightly
moistened with solvent.
6-22
CAUTION
The epoxy moisture sealant on the
etched circuit boards is susceptible to
softening if solvent is applied for exces-
sive periods of time or if an excessive
amount of solvent is used. Be careful
when cleaning these printed circuits
with solvent. Dry with a clean, lint-free
cloth immediately after cleaning with
solvent-moistened cloth.
j. Switches, Wafer. Clean switches of the
(1) Remove all dust with the air jet, rotating
switch rotor back and forth several times while
blowing.
(2) Wash all contacts and insulation with
solvent lightly applied with a small, camel’s-hair
brush.
air jet; then repeat wash
(3) Dry with
the
using clean solvent and rotating switch rotor.
k. Gaskets, Rubber.
(1) Remove any grease from surfaces with a
dry, lint-free cloth.
(2) Make up a washing bath of 2 ounces of
detergent powder per gallon of water.
(3) Immerse gaskets and seals in bath, and
wash clean with lint-free cloth.
(4) Rinse well in clean, warm water, dry with
the air jet. Protect from dust, lubricants, and
high temperatures before inspection.
6-8. Inspection of
Mechanical Parts
a. Introduction. This paragraph contains instructions and procedures to assist in determining (by inspection) the condition of the dismantled, disassembled, and cleaned components, assemblies, and parts of the 878L-15/16/17 module
testers. Defects resulting from wear, physical
damage, deteriorations, or other causes are
brought to light by these inspection procedures.
To facilitate inspection, detailed inspection procedures are arranged alphabetically under
mechanical and electrical headings. Whever
possible, inspection procedures are listed in
tabular form.
b. Inspection Procedures. This paragraph con-
.
(1) Chassis. Inspect chassis for deformation,
dents, punctures, badly worn surfaces, damaged
connectors, damaged fastener devices, or damaged handles. Also inspect them for corrosion
and damage to finish that will require refinish-
ing.
(2) Covers. Inspect covers and shields for
punctures, deep dents, and badly worn surfaces.
Also check for damaged fastener devices, corro-
TM 11-6625-1636-14
sions, and damage to finish that will require
refinishing.
(3) Gaskets, rubber. Inspect gaskets and
seals for deformation and for damage such as
tears, creases, folds or elongation, rough surfaces, and embedded foreign matter. Check for
loss of resiliency by moderately stretching or
compressing and noting any failure to return to
shape.
(4) Machined metal parts.
(a) Make overall check for physical dam-
age to surfaces, corners, and edges.
(b) Inspect closely all machined plane surfaces, holes, bores, counterbores, slots, grooves,
shoulders, flanges, teeth, tapped holes, and all
threaded members, both male and female, for
physical damage of any sort, including roughness of surface, corrosion, or presence of foreign
matter.
(5) Mechanical metal parts. Inspect the
numachined mechanical parts (ventilating gril-
les, mounting plates, chassis, mounting clamps
and brackets, nuts, bolts, screws, washers,
handles, fasteners, and hardware) for physical
damage or deformation. Also check for corrosion
and any damage which would require replating
or refinishing beyond practical touchup.
(6) Molded plastic parts. Inspect plastic
parts (terminal boards, mounting blocks, and in-
sulating members) for signs of corrosion,
cracked or charred insulation, an? loose or mis-
sing mounting hardware. Also cheek for other
abnormal indications which might be a source of
future breakdown
6-9. Inspection of, Electrical, or Electronic
Compoments
a. Capacitors, Fixed. Inspect fixed capacitors
for defects listed in table 6-11.
Table 6-11. Inspection of Fired Capacitor8
Defect
Metal
case
Molded
I
type
Ceramic
type
I
Oil leakage (at case seams or
around terminal insulation).
Cracked, broken, or charred
terminal insulation.
Case damage (dents or holes).
Case damage (cracks or break-
age).
Body damage (cracks or break-
age).
Loose, broken, or corroded
terminal studs, lugs, or leads.
Loose, broken, or improperly
X
X
X
soldered terminal connec-
tions.
Loose mountings.
X
I i
x x
b. Capacitors, Variable. Inspect variable
capacitors for corrosion of shafts, cases, and
other visible parts, loose mountings, and physical damage. Rotate the shaft to determine
whether action is too rough, too loose, or too
tight.
C. Coils Inspect coils for broken leads, loose,
broken, or poorly soldered terminal connections,
and loose mounting. Also check for crushed,
scratched, cut or charred windings, leads, and
terminal connections. Check for physical damage to forms and tuning slug adjustments,
where applicable.
d. Connections. Inspect connector bodies for
broken parts, deformed shells or clamps, and
other irregularities. Inspect for cracked or broken insulation and for contacts that are broken,
deformed, or out of aligment. Also check for corroded or damaged plating on contacts and for
loose, poorly soldered, broken, or corroded terminal connections.
e. Jacks. Inspect all jacks for corrosion, rust,
loose or broken parts,
cracked insulation, bad
contacts, and other irregularities.
f. Printed Circuit Boards.
(1) Inspect for loose, broken, corroded, or
poorly soldered terminal connections.
(2) Inspect printed circuits for any evidence
of damage, such as burned, broken, cracked, or
corroded plating.
(3) Inspect printed circuit connectors for
peeling, shavings, scarred, or corroded conec
tor terminals.
(4) Inspect for complete moisture sealant
coating of printed circuit boards.
(5) Inspect for loose mounting of printed
circuit boards.
g. Resistors,
Fixed Composition. Inspect
these resistors for cracked, broken, blistered, or
charred bodies and loose, broken, poorly soldered, or corroded terminal connections.
h. Resistors, Fixed Wire-wound. Inspect these
resistors for signs of heating, cracked, broken,
or charred insulation, loose, poorly soldered,
broken, or corroded terminal connections, and
loose mounting.
i. Resistors, Variable. Inspect variable resis-
tors for corrosion of shafts, cases, and other visible parts, loose mountings, and physical dam-
age. Rotate the shaft, where possible, to determine whether the action is too rough, too loose,
or too tight.
j. Switches, Wafer.
(1) Inspect insulation for cracks or break-
age and for charring.
(2) Check m
ovable and stationary contacts
6-23
TM 11-6625-1636-14
for deformities, breakage, and wear and for
burning, pitting, or corrosion.
(3) Inspect terminals for loose, poorly sol-
dered, broken, or corroded connections.
(4) Examine mechanical parts for damage
or corrosion and for irregular or rough action.
k. Terminal Connections, Soldered.
(1) Inspect for cold-soldered or rosin joints.
These joints present a porous, dull, rough, ap-
pearance. Check for strength of bond using the
point of a tool.
(2) Examine for excess solder, protrusions
from the joint, pieces adhering to adjacent insulation, and particles lodged between joints, conductor, or other parts.
(3) Inspect for insufficient solder and unsoldered strands of wire protruding from con-
ductor at joint. Look for insulation that is stripped back too far from joint or badly frayed joint.
(4) Inspect for corrosion (verdigris) on cop-
per conductor at joint.
E. Transformers. Check all parts for signs of
excessive heating, physical damage to case,
cracked or broken ceramic insulators, and other
irregularities. Also check for corroded, poorly
soldered, or loose terminals and loose, broken or
missing mounting hardware.
m, Wiring. Inspect open and laced wiring of
chassis, terminal boards, and parts of equipment by checking insulation for physical damage and charring. Check wires for breakage and
for improper dress in relation to adjacent wiring
and chassis.
6-24
TM 11-6625-1636-14
APPENDIX A
REFERENCES
Following is a list of references available to the direct and general support and depot maintenance
repairman of the radio set:
DA Pam 310-4
DA Pam 310-7
TB 43-0118
TM 11-5821-248-35
TM 11-5985-326-20
TM 11-6625-209-15
TM 11-6625-261-12
TM 11-6625-366-15
TM 11-6625-438-15
Index of Technical Manuals, Technical Bulletins, Supply Manuals
(Types 7, 8, and 9), Supply Bulletins, and Lubrication Orders.
Military Publications: Index of Modification Work Orders,
Field Instructions for Painting and Preserving Electronics Command
Equipment.
DS, GS, and Depot Maintenance Manual: Radio Set AN/ARC-102.
Organizational Maintenance Manual: Coupler, Antenna CU-1658/A and
CU-1669/GRC.
Operator’s, Organizational, DS, GS, and Depot Maintenance Manual,
Multimeters ME-26A/U, ME-26B/U, ME-26C/U, and ME-26D/U.
Operator’s and Organizational Maintenance Manual: Audio Oscillators
TS-382A/U, TS-382B/U, TS-382D/U, TS-382E/U, and TS-382F/U.
Operator’s, Organizational, DS, GS, and Depot Maintenance Manual:
Multimeter TS-352B/U.
Organizational, Direct Support, General Support, and Depot Mainte-
nance Manual: Voltmeter, Electronic AN/USM-98.
A-1
APPENDIX C
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
C-1. General
This appendix provides a summary of the
maintenance operations for the AN/ARM-log.
It authorizes categories of maintenance for
specific maintenance functions on reparable
items and components and the tools and equip-
ment required to perform each function. This
appendix may be used as an aid in planning
maintenance operations.
C-2. Maintenance Function
Maintenance functions will be limited to and
defined as follows:
a. Inspect. To determine the serviceability of
an item by comparing its physical, mechanical,
and/or electrical characteristics with established standards through examination.
b. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical
or electrical characteristics of an item and comparing those characteristics with prescribed
standards.
c. Service. Operations required periodically to
keep an item in proper operating condition, i.e.,
to clean, preserve, drain, paint, or to replenish
fuel/lubricants-hydraulic fluids or compressed
air supplies.
d. Adjust. Maintain within prescribed limits
by bringing into proper or exact position, or by
setting the operating characteristics to the
specified parameters.
e. Align. To adjust specified variable elements
of an item to about optimum or desired performance.
f. Calibrate. To determine and cause correc-
tions to be made or to be adjusted on instruments or test measuring and diagnostic equipment used in precision measurement. Consists
of the comparison of two instruments, one of
which is a certified standard of known accuracy,
to detect and adjust any discrepancy in the accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or
fixing into position an item, part, module (component or assembly) in a manner to allow the
proper functioning of the equipment/system.
h. Replace. The act of substituting a service-
TM 11-6625-1636-14
able like-type part, subassembly, model (component or assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance ser-
vices (inspect, test, service, adjust, align, calibrate, replace) or other maintenance actions
(welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part,
subassembly, module/component/assembly, end
item or system. This function does not include
the trial and error replacement of running spare
type items such as fuses, lamps, or electron
tubes.
j. Overhaul. That periodic maintenance effort
(service/action) necessary to restore an item to a
completely serviceable/operational condition as
prescribed by maintenance standards (e.g.,
DMWR) in appropriate technical publications.
Overhaul is normally the highest degree of
maintenance performed by the Army. Overhaul
does not normally return an item to like-new
condition.
k. Rebuild. Consists of those services/actions
necessary for the restoration of unserviceable
equipment to a like-new condition in accordance with original manufacturing standards.
Rebuild is the highest degree of material
maintenance applied to Army equipment. The
rebuild operation includes the act of returning
to zero those age measurements (hours, miles,
etc.) considered in classifying Army equipment/components.
C-3. Column Entries
a. Column 1, Group Number. Column 1 lists
group numbers, the purpose of which is to identify components, assemblies, subassemblies and
modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2
contains the noun names of components, assem-
bilies, subassemblies, and modules for which
maintenance is authorized.
c. Column 3, Maintenance Functions. Column
3 lists the functions to be performed on the item
listed in column 2. When items are listed with-
C-1
TM 11-6625-1636-14
out maintenance functions, it is solely for pur-
pose of having the group numbers in the MAC
and RPSTL coincide.
d. Column 4, Maintenance Category. Column 4
specifies, by the listing of a “worktime” figure in
the appropriate subcolumn( the lowest level of
maintenance authorized to perform the function listed in column 3. This figure represents
the active time required to perform that
maintenance function at the indicated category
of maintenance. If the number or complexity of
the tasks within the listed maintenance function vary at different maintenance categories,
appropriate
“worktime” figures will be shown
for each category. The number of man-hours
specified by the “worktime” figure represents
the average time required to restore an item
(assembly, subassembly, component, module,
end item or system) to a serviceable condition
under typical field operating conditions. This
time includes preparation time, troubleshooting
time and quality assurance/quality control time
in addition to the time required to perform the
specific tasks identified for the maintenance
functions authorized in the maintenance allocation chart. Subcolumns of column 4 are as fol-
lows:
C-Operator/Crew
O-Organizational
F-Direct Support
H-General Support.
D-Depot
e. Column 5, Tools and Equipment. Column 5
specifies by code, those common tool sets (not
individual tools) and special tools, test, and sup-
port equipment required to perform the designated function.
C-4. Tools and Equipment Requirements
(Table1)
a. Tool or Test Equipment Reference Code. The
numbers in this column coincide with the numbers used in the tools and equipment column of
the MAC. The numbers indicate the applicable
tool or test equipment for the maintenance
functions.
b. Maintenance Category. The codes in this
column indicate the maintenance category al-
located the tool or test equipment.
c. Nomenclature. This column lists the noun
name and nomenclature of the tools and test
equipment required to perform the maintenance functions.
d. National/NTAO Stock Number. The column
lists the National/NATO stock number of the
specific tool or est equipment.
e. Tool Number. This column lists the man-
ufacturer’s part number of the tool followed by
the Federal Supply Code for manufacturers (5digit) in parentheses.
C-2
TM 11-6625-1636-14
Section II.
MAINTENANCE
FOR
ALLOCATION
TEST SET, ANTENNA COUPLER AN/ARM-109
(3)
MAINTENANCE
FUNCTION
Inspect1
Test2
Replace '
Repair
Inspect'
Test
Replace
Repair
Inspect'
Test
Replace
Repair
DIXRIMINATOR TESTER TS-2352/ARM-109
(Collins p/n 87'L-17)
Inspect1
Test
Replace
Repair
Inspect1
Test2
Replace
Repair
CHART
(4)
MAINTENANCE CATEGORY
C
0
F
0.1
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
3
0.1
0.2
1.0
0.6
1.2
1.0
0.6
1.0
1.0
4.0
4.0
4.0
TOOLS AND
EQUIPMENT
1,2
1.2
3 thru 8
1.2
3 thru 9
1.2
3
thru 8
1,2
3 thru 14
1,2
3 thru 8
3 thru 14
1,2
3 thru 14
1,2
3
thN
14
1,2
1,2
3,4,5
1. Visual inspection of equipment to determine maintenance in
2. Equipment operation check and electrical continuity check.
3. Organizational refers to externally replacing fuses, lamps.
4. Limited to component replacement.
to cleaning, painting,
regards
and external
external me
ca
land
connections, and cables.
lectri
l damage.
C-3
TM 11-6625-1636-14
Tool or Test
EQUIPMENT
REF CODE
1
2
3
L
5
6
7
8
9
10
11
12
13
14
MAINTENANCE
CATEGORY
0
0
F,H,D
H,D
H,D
H,D
H,D
H,D
H,D
O.F,H,D
H,D
H,D
H,D
H,D
TABLE 1.
TOOL AND TEST EQUIPMENT REQUIREMENTS
FOR
TEST SET, ANTENNA COUPLER AN/ARM-109
NOMENCLATURE
MULTIMETER AN/URM-105
TOOL KIT, ELECTONIC EQUIPMENT TK-101/G
TOOL KIT, ELECTRONIC EQUIPMENT TK-100/G
VOLTMETER
ELECTRONIC AN:USM-98
,
MULTIMETER TS-352/U
BRIDGE-CAPACITANCE. INDUCTANCE RESISTANCE AN/URM-90
COUNTER, ELECTONIC DIGITAL READOUT AN/USM-207A
TEST SET,
TRANSISTOR TS-1836A
MULTIMETER ME-26B/U
CABLE CX-10735/U
ANTENNA COUPLER CONTROL (Collins 528-0465-000)
RECEIVER-TRANSMITTER RT-698/ARC-102
RADIO SET, CONTROL C-3940/ARC-94
METER TESTER TS-656/U
NATIONAL NATO
STOCK NUMBER
TOOL NUMBER
6625-00-581-2036
5180-00-064-5178
5180-00-605-0079
6625-00-753-2115
6625-00-242-5023
6625-00-534-7458
6625-00-044-3225
6625-00-893-2628
6625-00-542-6407
6625-00-435-2638
5821-00-043-1990
5821-00-604-3307
5821-00-953-2204
6625-00-348-0666
C-4
COLOR
WOE
FOR COMPOSITION TYPE AND FILM TYPE RESISTORS.
TABLE I
COLOR CODING FOR TUBULAR ENCAPSULATED R.F. CHOKES.
TABLE 2
FO-1. Resistor, capacitor, and inductor codes.
TM 11-6625-1636-14
TABLE 3 -
TABLE 4- TEMPERATURE COMPENSATING. STYLE CC.
FOR USE WITH STYLES CM, CN, CY AND CB.
FO-2.1. 878L-15 Antenna Coupler Control Tester, Schematic diagram (Sheet 1 of 2)
TM 11-6625-1636-14
FO-2.2.
TM 11-6625-1636-14
TM 11-6625-1636-11
FO-3.
TM 11-6625-1636-14
FO-4.
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