Minolta Di450 Service Manual page 426

Transport/Separator Misfeed Troubleshooting Procedures
• Paper is at a stop at the Synchronizing Rollers.
Step
1 Synchronizing Rollers are dirty with paper
dust, deformed, or worn.
2 The length of the loop formed before the Syn-
chronizing Rollers is okay.
3 I/O check for Synchronizing Roller Sensor
operation: the voltage across PJ4A-3B on Mas-
ter Board and GND is DC0V when the sensor
is unblocked and DC5V when the sensor is
blocked.
4 Synchronizing Roller Motor turns when the
Start key is pressed.
• Paper is at a stop near the PC Drum.
Step
1 Image Transfer Entrance Guide Plate is dirty
with paper dust, deformed, or worn.
2 Image Transfer/Paper Separator Corona wires
are dirty or deteriorated.
3 Paper guide above Paper Separator Corona is
dirty or deformed.
• Paper is at a stop near the PC Drum Paper Separator Finger.
Step
1 PC Drum Paper Separator Fingers are dirty or
deformed.
2 Separator Finger Solenoid operation: the volt-
age across PJ7A-4B on Master Board and
GND is DC24V when the solenoid is deener-
gized and DC0V when the solenoid is ener-
gized.
• Paper is at a stop on the Suction Belts.
Step
1 Suction Belts turn correctly.
2 Suction Fan Motor rotation when the Start key
is pressed: the voltage across PJ13A-2B on
Master Board and GND is DC0V when the
motor is deenergized and DC5V when the
motor is energized.
Check
Check
Check
Check
T-18
Result Action
YES Clean or change.
NO Adjust loop length.
YES Change Master Board.
NO Correct actuator.
Change sensor.
NO Correct drive coupling.
Change motor or Master
Board.
Result Action
YES Clean or change.
YES Clean or change.
YES Clean or change.
Result Action
YES Clean or change.
YES Change solenoid.
NO Change Master Board.
Result Action
NO Correct drive coupling.
YES Change Suction Belts or
motor.
NO Change Master Board.