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Page Title:
Driver, Discriminator, and Antenna Coupler Tray A5, Trouble Isolation Chart |
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|  TM 11-6625-847-12
4-25.
Driver, Discriminator, and Antenna Coupler Tray A5, Trouble Isolation Chart
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
1
POWER indicator will not
a. Improper seating of input
a. Tighten power connector.
illuminate. power connector.
b. Defective test set fuse ------------------
c. Defective indicator light -----------------
d. Defective POWER switch -------------
d. Higher category repair re-
quired.
2
DRIVER 200 indicator will
a. Microswitch defective ------------------
a. Higher category repair re-
not illuminate.
quired.
b. Defective 200-volt dc power
b. Higher category repair re-
supply.
quired.
c. Defective indicator light -----------------
d. Improper seating of input
d. Tighten power connector.
power connector.
e. Improper seating of DIS-
e. Reset discriminator assembly;
CRIMINATOR assembly
if this does not correct prob-
connector, and discrimina-
lem, check DISCRIMINA-
tor assembly 2A4, AM-
TOR assembly connector for
3349/GRC-106.
bent pins or broken wires.
Higher category repair re-
quired.
3
DRIVER TEST SELEC-
a. Defective DRIVER TEST
a. Higher category repair re-
TOR switch set to 1, and
SELECTOR switch
quired
AN/PSM-6 ac leads
b. Improper seating of input
b. Tighten power connector.
connected to DRIVER
power connector.
HI and LO test points
c. Defective 6.3-volt ac power
c. Higher category repair re-
(lower right side); volt-
supply.
quired.
age varies more or less
than limits of 6.5 to 7.5
volts ac.
4
DRIVER TEST SELEC
a. Defective DRIVER TEST
a. Higher category repair re-
TOR switch set to 4; 27
SELECTOR switch
quired.
volts de is not present.
b. Improper seating of input
b. Tighten power connector.
power connector.
c. Defective test set fuse.
d. Defective POWER switch --------------
d. Higher category repair re-
quired.
e. Higher category repair re-
e. Defective 27-volt dc power
supply.
quired.
5
RELAY 1 through 7 indi-
Defective indicator lamp assem-
Replace RELAY indicators 1
cators do not light when
blies Z1 through Z7.
through 7 in lamp assemblies
press to test function of
Z1 through Z7 as needed (para
indicators is press
set is mounted in the spare fuseholder,
4-26. Replacement and Adjustments
directly below the main fuseholder. A
a. Replacement of Fuses.
spare fuse for tray A4 will be part of the
(1) Press in on the fuse cap and turn it
running spare items list.
counterclockwise to unlock; remove the
(3) Replace the cap and the fuse in the
cap and the fuse.
fuseholder; tighten by pressing in and
(2) Discard the old fuse and insert a new
turning the cap clockwise.
fuse of the same type and rating in the
fuse cap. A spare fuse for the test
4-18
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