Minolta Di251 Service Manual page 326

• Paper is at a stop inside the Duplex unit.
Step
1 Duplex Unit Transport Roller/Roll 2 is dirty,
deformed, or worn.
2 Manual Feed Paper Take-Up Roll is dirty,
deformed, or worn.
3 Duplex Unit Transport Sensor operation check
through I/O check
4 Duplex Unit Transport Sensor operation check:
the voltage across PJ4A-5 on Duplex Unit Con-
trol Board and GND is DC0 V when the sensor
is blocked and DC5 V when the sensor is
unblocked.
5 Duplex Unit Transport Sensor operation check:
the voltage across PJ1A-12 on Duplex Unit
Control Board and GND is DC0 V when the
sensor is blocked and DC5 V when the sensor
is unblocked.
6 Manual Feed Paper Take-Up Clutch operation
check: the voltage across CN14-2 on the side
of Master Board and GND changes from DC24
V to DC0 V when paper leaves the Duplex Unit
for the second copy cycle.
• Paper is at a stop near the Synchronizing Roller.
Step
1 Pre-Image Transfer Guide Plate is dirty or
deformed.
2 Synchronizing Roller Sensor operation check
through I/O check
Check
Check
T-28
Result Action
YES Clean or change.
YES Clean or change.
YES Check step 6.
NO Change Duplex Unit Trans-
port Sensor.
YES Change Master Board.
NO Change Duplex Unit Con-
trol Board.
YES Change Manual Feed
Paper Take-Up Clutch.
NO Change Master Board.
Result Action
YES Clean or change.
YES Change Master Board.
NO Check actuator.
Change Synchronizing
Roller Sensor.