Minolta Di450 Service Manual page 236

C0072
Step
1 Toner Bottle turns when the Toner Bottle is
turned a half turn and the Front Door is closed.
2 I/O check for Toner Bottle Home Position Sen-
sor operation: the voltage across PJ11A-5 on
Master Board and GND is DC5V (Toner Bottle
at home position) and DC0V (Toner Bottle at a
position other than home) when step 1 is per-
formed.
3 Main Hopper Toner Replenishing Motor rota-
tion: the voltage across PJ11A-1 on Master
Board and GND is DC0V (Toner Bottle at a
stop) and DC24V (Toner Bottle turning) when
step 1 is performed.
C0090
Step
1 Developing Unit Drive Motor rotation: the volt-
age across PJ7A-7A on Master Board and
GND is DC5V (motor deenergized) and DC0V
(motor energized) when the Start key is
pressed.
2 Developing Unit Drive Motor rotation: the volt-
age across PJ7A-6A on Master Board and
GND is DC5V (motor deenergized) and DC0V
(motor energized) when the Start key is
pressed.
Check
Check
T-45
Result Action
NO Correct drive coupling.
YES Change Master Board.
NO Check sensor for installa-
tion.
Correct detecting plate.
Change sensor.
YES Change motor.
NO Change Master Board.
Result Action
NO Change Master Board.
YES Correct drive coupling.
Correct installed position
of the Developing Unit.
Change motor.
NO Change Master Board.