TM 11-6625-2709-40
2-8.
Troubleshooting Chart - Continued
Probable trouble
Proper
Procedure
for improper
Step
Correction
indication
indication
brate the resolver
89
test set. (Refer
(Cont)
to TM 11-6625-
492-12 for cali-
bration of the re-
solver test set.
Disconnect the
MOD OUTPUT of
the VOR modula-
tor from the VAR
connector on the
resolver test set.
Connect the IN-
PUT lead of the
vtvm to the
connector on the
resolver test set.
Set the function
switch on the re-
solver test set to
ORZ. Adjust the
INPUT
LEVEL
control on the re-
solver test set
for a 4.25-volt in-
dication on the
vtvm.
Remove
the INPUT lead of
the vtvm from the
connector, and
connect it to the
OUTPUT
connec-
tor on the resol-
ver test set. Set
the test set BRG-
OBS switch to
OBS. Set the
SWEEP TIME on
the oscilloscope
to 20 millisec-
onds. Adjust the
oscilloscope ver-
tical gain until
the pattern fills
the grid. Rotate
the OBS control
on the test set
and the AMP BAL
control on the re-
solver test set
until the least
possible signal
amplitude (mini-
mum null) is ob-
served on the
oscilloscope.
Change 1
2-23
