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TM 11-6625-3023-14/ET904-AA/MMA-010/E154 TS3684/TO 33A1-12-1173-1
Table 6-1. Test Set Troubleshooting - Continued
Fault indication
Probable cause
Corrective action
8. +500 VDC (8%)
a. Zener diode D3 and/
a. Replace zener
not present
or D4 open or
diode D3 and/or
across test
shorted.
D4 and associated
points K and A
heat sink
(switches S2
and S3 pressed).
Switch S4 in
b. Switch S2 and/or
b. Replace switch S2
BULK position
S3 open (not
and/or S3
and switch S5
closing),
position.
in OPEN
c.
Broken wire.
c.
Check wiring for
9. +140 VDC (8%)
a. Zener diode D4
a. Replace zener
not present
open or shorted.
diode D4 and
across test
associated heat
points L and A
(switches S2
and S3 pressed).
b. Switch S2 and/or
b. Replace switch S2
Switch S4 in
S3 open (not
and/or S3
EXTERNAL or COAX
closing).
switch S5 in
position and
c.
Broken wire.
c.
Check wiring for
OPEN position.
10. No voltage
between test
points E and A.
Switches S2 and
S3 pressed at
the same time.
a.
Switch S4 in
a, b, and c.
a, b, and c.
BULK
position.
(1)
Switch S5
(1) Switch S5
Replace switch S5
in OPEN
defective.
position.
Lamp L2 open,
Replace lamp L2
+500 VDC
8% not
Resistor R4
Replace resistor R4
present.
and/or R5 open.
and/or R5 (para 6-22).
(2)
Switch S5
(2) Switch S5
in SHORT
defective.
position.
Lamp L2 open,
+210 VDC
Defective
Check wiring for
10% not
wiring,
present.
6-4

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