TM 11-6625-2709-40
2-8. Troubleshooting Chart - Continued
Probable trouble
Proper
for improper
Step
Procedure
Indication
indication
Correction
If OUTER lamp does not light, DS4 is
87
Jumper P7-P to P7-M.
OUTER lamp should light.
Replace DS4.
defective.
If OUTER lamp does not light, Q3,
Refer to figure 4-2 and check circuit
88
Place an 18.1 k resis-
OUTER lamp should light.
R6, or R7 is defective.
tor in series between P7-
comprised of Q3, R6, or R7 to isol-
P and P7-N.
ate the trouble.
Connect the equipment
Course Indicator ID-1347C/ARN-82
Troubleshoot the OBS indicator as
89
Minimum null should appear
on the oscilloscope with the
is defective or misaligned.
described in TM 11-5826-226-34.
as shown in figure 2-11.
Course Indicator ID-
OBS indicator set to 300
degrees.
1347C/ARN-82 must be
used. On Radio Test Set
TS2500B/ARM-92,
MODE switch must be
in the 30 Hz position.
A schematic diagram of
the fabricated cable is
shown in figure 4-1. Cali-
Change 1
2-22.6
