Canon PC920 Service Manual page 352

Code
• The main motor (M1) is fault.
• The DC controller PCB is faulty.
• The composite power supply PCB is
• The DC controller PCB is faulty.
• The scanner home position sensor
( )
• The scanner/lens drive motor (M2)
The keys on the
control panel
• The DC controller PCB is faulty.
are locked
without error
code indication.
• The lens home position sensor
• The scanner/lens drive motor (M2)
• The lens cable is faulty.
• The DC controller PCB is faulty.
• The scanning lamp (LA1) is faulty.
• The DC controller PCB is faulty.
• The composite power supply PCB is
• The DC controller PCB is faulty.
• The composite power supply PCB is
• The frequency of the power supply
• The composite power supply PCB is
• Data communication between the
• The DC controller PCB is faulty.
• The composite power supply PCB is
COPYRIGHT © 1999 CANON INC.
Cause
faulty.
(PS1) is faulty.
is faulty.
(PS2) is faulty.
is faulty.
faulty.
faulty.
is faulty.
faulty.
copier and the ADF (faulty).
faulty.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
Description
• The rotation of the main motor deviates
(indicated by MLOCK=0) for 1 sec or
more while the main motor drive signal
(MMD=1) is being generated.
• The actual output value of the compos-
ite power supply high voltage is differ-
ent from the setting value twice in
succession.
• The scanner home position is not
detected within 10 sec after the scanner
has turned on.
• The scanner does not leave the home
position after it has turned on.
• The lens hoe position is not detected
after the lens has moved the maximum
travel distance.
• The lens does not leave the home
position after it has turned on.
• The lamp ON detection signal is not
detected for 1 sec or more in the
presence of the scanning lamp On
signal.
• The lamp ON detection signal is
detected for 1 sec or more in the
absence of the scanning lamp ON
signal.
• A fault in the communication between
DC controller PCB and composite
power supply PCB is detected.
• The interval between zero-cross signals
is in excess of the allowed interval.
• The communication with the copier is
interrupted for 5 sec or more; the
communication is monitored at all
times.
• During a copying run, the +24 V power
deviates from the control value by
±20%.
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