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CHAPTER 4 TROUBLESHOOTING MALFUNCTIONS
4-5
9. The main motor fails to rotate.
10. The copyboard fails to move.
Cause Step Checks YES/NO Remedies
Main motor (M1) 1 Set the meter to the ‘30VDC’
range. Does the voltage
between J903-1 (+) and J903-2
change from about 0 V to about
20 V according to the operation
of the main motor?
YES Replace the main motor.
DC controller/DC
power supply PCB
NO Check the wiring from the
motor to the DC controller/
DC power supply PCB; if
normal, replace the DC
controller/DC power
supply PCB.
Cause Step Checks YES/NO Remedies
Main motor (M1) 1 Is the main motor rotating? NO See “The main motor fails
to rotate.”
Copyboard,
Copyboard drive
assembly
2 Push the copyboard by hand.
Does it move smoothly?
NO Check the copyboard and
copyboard drive assembly.
DC controller/DC
power supply PCB
3 Set the meter to the ‘200Ω’
range. Disconnect J902 from
the copyboard drive solenoid,
and measure the resistance
between terminals of SL2.
Is it about 120Ω?
YES Check the wiring from the
solenoid to the DC con-
troller/DC power supply
PCB; if normal, replace
the DC controller/DC
power supply PCB.
Copyboard drive
solenoid (SL2)
NO Check the solenoid (SL2).