Canon PC1000s Service Manual page 390

CHAPTER 7 TROUBLESHOOTING
6.3
Variable Resistors, Light Emitting Diodes (LED), and
Check Pins by PCB
Of the VRs, LEDs, and check pins used in the machine, those needed when servicing in
the field are discussed:
A
1. Some LEDs emit dim light even when OFF, this is a normal condition,
and must be kept in mind.
A
2. VRs that may be used in the field:
0
VRs that must not be used in the field:
@
A
Do not touch the VRs and check pins not found in the Lists herein; they are
exclusively for the factory, and require special tools and high accuracy.
6 . 3 . 1
Image Processor PCB
JP1:
jumper plug for power used by battery to back up memory (control data; user data, service
mode data).
BATI:
battery used to back up memory (SRAM; control data: service mode data, user mode data).
BAT2
banery used to back up memory
(SDRAM;
fax images)
*1: If equipped with ADF functions.
*2: If equipped with printer functions.
*3: If equipped with fax functions.
COPYRIGHT02002 CANON INC. CANON PC100(XJimageCLASS DBOXREV.
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AUG.2W2