TM 5-3895-374-24-2
Problem
Cause
Solution/Reference
Master/Ratio controller
failed
Check voltage at terminal
+ and -
Should be 24 Vdc
If not check fuse in
computer panel
Output pins #1 and #12
must be 10.0 Vdc
If not replace master ratio
module
See electrical drawing
AA00318
Speed potentiometer
failed
Check voltages at
potentiometers by
reference to drawings
Master set at maximum
Terminals 3, 5, 7 and 9
should be 10. Vdc
Terminals 4, 6, 8 and 10
should vary with position
of potentiometers
See electrical drawings
AA00318 and AA00319
Variable speed drive
control not stable
Loose connection in
control wiring
Manual potentiometer
failed
Variable speed drive
failure
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