Brother 1660e - B/W Laser Printer, Service Manual

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VI
- 15
Possible cause Step Check Result Remedy
Low-voltage power
supply PCB
LV harness
Main PCB
1 Is the voltage of P7-1 in the main PCB
con24V? No Replace the main PCB assy
low-voltage power supply PCB
assy, or the LV harness.
DC motor harness
DC motor assy.
2 Does the voltage of P7-4 in the main PCB
connector drop from 5V to 0V after dropping
the voltage of P7-3 from 5V to 0V? No Replace the main PCB assy.
"54 MOTOR MALF" is displayed (The main motor rotation disabled) M-11
Yes Replace the DC motor harness
or the DC motor assy.
Possible cause Step Check Result Remedy
Mis-operation 1 Is the paper feed mode set correctly? No Set paper feed mode
correctly.
Main PCB 2 Does the voltage of P3-20 (or 19) in the main
PCB connector rise from 0V to 5V and is a
pulses having about 11ms period generated
at P3-6, 7, 8 ,9 pin? No Replace the main PCB assy.
No paper pick-up from cassette (or MP tray) M-12
Feed flat cable 3 Does the voltage of P5-20 (or 19) in the paper
feeder PCB. Connector rise from 0V to 5V
and is the pulses having about 11ms period
generated at P3-6, 7, 8 ,9 pin? No Replace the feed flat cable.
Paper feeder
PCB 4 Does the voltage of P3-1 (or P4-1) in the
paper feeder PCB connector drop from
24V to 0V and is the chopping pulses
generated at P1-1, 2, 5 ,6 pin? No Replace the Paper feed/size-
SW PCB assy.
Pick-up(or MP
Pick) solenoid 5 Does the pick-up (or MP Pick) solenoid
operate? No Replace the pick-up (or MP
Pick) solenoid.
Paper feed motor 6 Does the pick-up motor rotate? No Replace the paper feed motor assy.