17 January, 2003
SC TABLE
4-13
SC No.
Item
Definition
Possible Cause
Related
SCs
Troubleshooting Procedure
Type
SC 221 Synch.
detection signal
error 2
221-001: Y
221-002: M
221-003: C
221-004: K
Main scan length detection is
not properly completed ten
consecutive times.
The front (for C&M) or rear (for
K&Y) laser synchronizing
detector boards are used for
the main scan length
detection, which automatically
corrects the main-scan
magnification.
•
Damaged or
disconnected cable
between front (C&M)
or rear (K&Y) laser
synchronizing
detector board and
the LD unit
•
Incorrect installation
of front (C&M) or rear
(K&Y) synchronizing
detector board (the
beam does not target
the photo detector.)
•
Defective front (C&M)
or rear (K&Y)
synchronizing
detector board
•
Defective LD unit
After doing any of the following, print ten
jobs or more to see if the same SC code
is displayed:
1. Turn the main switch off and on.
2. Check or replace the cable
connecting front (for C&M) or rear (for
K&Y) synchronizing detector board
and the LD unit.
3. Check or reinstall the front (for C&M)
or rear (for K&Y) synchronizing
detector board.
4. Replace the front (for C&M) or rear
(for K&Y) synchronizing detector
board.
5. Replace the laser optics housing unit.
6. Replace the BCU.
If a synch. detector board cannot be
replaced, do the following as a
temporary measure:
•
Disable main scan length detection
(SP 2-919-001)