Minolta Di 620 Manual page 262

7) C0090 : Developing Unit Drive Motor M1's Failure to Turn
Developing Unit Drive Motor M1
C0090
Step
1 Check M1 for operation.
Does the voltage across PJ7A-5A on PWB-
A and GND change from DC5V to DC0V
when the Start key is pressed?
2 Does the voltage across PJ7A-7A on PWB-
A and GND change from DC5V to DC0V
when the Start key is pressed?
3 Is the voltage across PJ7C-4B on PWB-C
and GND DC24V?
Relevant Electrical Parts
Check Item
Master Board PWB-A
Power Supply Board PWB-C
Result
NO Change PWB-A.
NO Check gears for overload and, if they are
okay, change M1.
YES Change PWB-A or M1.
NO Change PWB-C.
T-47
1155C10TAA
Action