TM 11-6625-2709-40
2-8.
Troubleshooting Chart - Continued
Probable trouble
Proper
for improper
Procedure
Correction
Step
indication
indication
Note:
89
AS the
null is approached.
(Cont)
increase the os-
cilloscope ver-
tical gain.
a. Adjust resistor R2
a. Resistor R2 out of
Oscilloscope indi-
Set the BRG-OBS
90
cation should not
adjustment.
switch on the test
change from the in-
set to BRG.
dication obtained in
b. Precision bearing cir-
b. Refer to figure 4-12.
step 89 above.
cuit in test set is
Make continuity checks
defective.
on the precision bear-
ing circuit. Refer to
paragraph 2-9 for the
resistance of the trans-
former winding for
T2 and T3.
91
a. Troubleshoot the OBS
a. Course Indicator ID-
a.
Connect test
Course index on
a.
1347C/ARN-82 is
course indicator
set pendant
indicator as described
defective or misaligned.
should read 300
cable P2 to in-
in TM 11-5826-226-34.
3 degrees when
dicator test set
indicator test set
jack J2 using
SYNCHRO
METER
cable fabrica-
reads zero.
ted per instruc-
tions in para-
4-2). Use
Course Indica-
tor ID-1347C/
ARN-82 with
test set. Set
SYNCHRO SE-
LECTOR
switch on indi-
cator test set
to EZ. Set test
BRG-OBS
switch to 0BS.
Set test set
MODE switch
to 400 HZ.
Adjust course
index on course
indicator
around 300 de-
grees for zero
reading on in-
dicator test set
SYNCHRO
METER.
b. Rotate course
b. Indicator test set
b. Same as step a above.
b. Same as step a above.
index on course
SYNCHRO
METER
selector coun-
deflects to the
right.
terclockwise.
c. Course index on
c. Same as step a above.
c. Same as step a above.
course indicator
SELECTOR
switch on indi-
should read 30 3
(Cont)
cator test set
degrees when
2-24
Change 1
