E505 (Checksum Fault); E506 - Canon SADDLE FINISHER K3 Service Manual

4 Self Diagnosis
The CPU (IC101Z) on the finisher controller PCB is equipped with a self diagnostic
mechanism which runs a check as needed and communicates the presence of a fault, if
found, to the copier in the form of a code and a detail code.
The CPU (Q1) on the saddle stitcher unit is also equipped with a self diagnostic mecha-
nism which runs a check as needed and communicates the presence of a fault, if found, to
the finisher controller PCB.
In response, the copier indicates the received code in its control panel. (The detail code
may be checked in its service mode or with reference to LED101 on the finisher controller
PCB.)
4.1 Self Diagnosis
4.1.1 Finisher Unit
E500
Main cause Data communication (with copier)
Detection The communication between the copier and the finisher is disrupted and, in
addition, it is not resumed after an attempt at transmission for 5 sec.
The communication is disrupted under the foregoing condition and resumed
three times within 5 sec.
E501
Main cause Data communication (with slave CPU)
Detection The communication between the master CPU (IC101) and the slave CPU
(IC121) is disrupted.
E503
Main cause Data communication (with saddle stitcher unit)
Detection The communication with the saddle stitcher unit is disrupted.
E505
Main cause Backup RAM (EEPROM)
Detection The checksum at power-on has a fault.

E506

Main cause Download error
Detection The following detail codes are used:
01
02
03
04
05
COPYRIGHT© 2001 CANON INC.
serial communication error
write error
user program transfer error
slave program transfer error
download time-out
2000 2000 2000 2000 CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
CHAPTER 5 TROUBLESHOOTING
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