Minolta Di450 Service Manual page 446

(3) C0042: Fusing Unit Cooling Fan Motor's failure to turn
Fusing Unit Cooling Fan Motor (M23)
M23
C0042
Step
1 Fusing Unit Cooling Fan Motor rotation: the
voltage across PJ13C-1 on Power Supply
Board and GND is DC24V (during high-speed
rotation) and DC16V (during low-speed rota-
tion) after the malfunction has been reset.
2 Fusing Unit Cooling Fan Motor rotation: the
voltage across PJ13C-3 on Power Supply
Board and GND is DC5V after the malfunction
has been reset.
Relevant Electrical Parts
Power Supply Board (PWB-C)
CN30
1 11
CN123
1 3 9 3
2 2 10 2
3 1 11 1
Check
T-38
PWB-C
PJ13C-1 (DC24V)
PJ13C-2 (GND)
PJ13C-3 (M23 LD)
4002C24TAA
Result Action
NO Change Power Supply
Board.
YES Change Master Board.
NO Check motor for installa-
tion.
Change motor.