TM 32-5835-005-14 & P
Section
VII.
DIRECT
SUPPORT
MAINTENANCE
SERVO
CAPSTAN
CONTROL
BOARD
(A1A5)
7-23. Disassembly Procedure.
Should any of the following symptoms or
malfunctions become evident during unit
7-24. Replacement of motor control
operation, probable cause is a defec-
board (A1A5).
(A1A5).
Power unit down and unplug defective
board; install replacement.
a. Capstan motor does not run.
7-25. Testing after Repair.
b. Capstan motor is running at an
obviously higher or lower speed than
a. If malfunction has been corrected,
selected.
see alignment Section X.
c. Variable 15/16 IPS and variable
b. If malfunction persists, refer to
1-7/8 IPS does not work.
higher level of maintenance.
d. Tape motion sense fails.
e. Deleted.
Section
VIII.
TESTING
AFTER
REPLACEMENT
OF
BIAS
BOARD
(A1A4)
7-26. Test
Equipment Required.
2 and adjust R4 so that channel 2 meter
indicates center of red zone.
e. Disconnect audio generator and
b. VTVM Type ME318/U.
connect VTVM to TP-3. Extender card is
necessary for TP-3.
f. Adjust R-17 for 4.0 VRMS.
a. Connect audio generator to RCVR1
input and adjust to 1 KHz at 0dB output.
(0.77 VRMS).
g. Connect VTVM to TP-4 and adjust
R-16 for 4.0 VRMS.
b. Place channels in the AGC mode
h. Disconnect VTVM, alignment of A1A4
and activate RECORD.
is complete.
c. Adjust R2 so that channel 1 meter
indicates center of red zone.