Canon NP6320 Service Manual page 249

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COPYRIGHT © 1999 CANON INC.
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Main cause
Scanner home position sensor (Q3),
scanner motor (M2), power supply
PCB, or DC controller PCB
Lens home position sensor (Q4), or
DC controller PCB
Lamp driver PCB or
Scanning lamp
DC controller PCB
DC controller PCB
Power supply PCB or
DC controller PCB
ADF controller PCB, power supply
PCB, or DC controller PCB
Sorter controller PCB or DC controller
PCB
Main switch or DC controller PCB.
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Fault criteria
1. If the scanner is not at the home
position (SCHP = 0) when the
Copy Start key is pressed.
If the scanner does not return to the
home position (SCHP remains 0)
within 15 sec (A4 size) after it starts
to reverse.
2. If the scanner is in the home posi-
tion (SCHP = 1) when the Copy
Start key is pressed.
• If the scanner does not leave the
home position (SCHP remains 1)
within 1.5 sec after it starts to ad-
vance.
• If the scanner does not return to the
home position (SCHP remains 0)
within 1 second after it leaves the
home position (SCHP = 0).
• If the lens does not return to the
home position (LHP remains 0)
within 2.5 sec.
• If LHP remains 1 for at least 4 sec.
• At the lamp ON timing, LAON=1 is
not true.
• At the lamp OFF timing, LAON=0 is
not true.
The communication between micro-
processor (master) and microprocessor
(slave) is interrupted.
If the data in EEPROM has been re-
written more than specified.
If the main frequency is out of the al-
lowed range.
If ADF remains 0 for 12 sec or
longer.
• If the copier does not communicate
with the sorter for at least 12 sec.
• If the SORTER STANDBY signal
does not return within 35 sec after the
BCR signal is outputted.
The DC controller PCB detects the au-
tomatic shut-off mechanism does not
work.
10-71