Hardware - Canon GP405 Service Manual

CHAPTER 11 SYSTEM INTEGRATION
C. Hardware
The following shows the connectors, LED, ROMs, and fuse used on the board:
IC112S
(4MB PROM)
CPU
LED101
Item
J8501 Used it for connection to the system motherboard.
J8502/J8503 Use it to connect the host computer/terminator (shared).
Fu 101 Use it to prevent overcurrent to the SCSI PCB. E603 will be indicated when Fu101
blows.
LED 101 <LED is On or Off>
The CPU on the SCSI PCB is not operating (faulty PCB). E601 is indicated on the
control panel.
<LED is Flashing (on for 0.2 sec; remains off longer)>
The CPU on the SCSI PCB is operating, but the cable connection is poor or the PCB is
faulty. E601 is indicated on the control panel.
<LED is Flashing (off and on at intervals of 0.5 sec)>
The operation is normal.
IC112S Used for SCSI.
11-6
J8501
System motherboard
Fu101 J8503
(SCSI) (SCSI-2)
Figure 11-202
Table 11-202
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
J8502
(SCSI-2)
Image memory
(DRAM 10MB)
Description