Replacing Rom - Canon LASER CLASS 3175 Service Manual

LASER CLASS 3170/3175/3175MS Chapter 1: Safety and Precautions

2.3.7 Replacing ROM

Observe the following precautions when replacing the ROM on the SCNT board,
for example, when replacing a defective ROM or when upgrading the software.
a) Preparation
Print out all battery backed up data.
Reception image data in image memory is erased approx. 12 hours
after power is turned off.
For details on battery backed up data, see this Chapter, 3.
PRECAUTIONS FOR DATA PROTECTION .
REFERENCE
b) Replacement
(1) Make sure that the power cord and the telephone line are disconnected.
(2) Put on the grounding wrist straps to counter electrostatic discharge.
(3) Remove the right cover, and shield cover referring to the PARTS CATALOG
(supplied separately) .
(4) Remove the ROM mounted on the SCNT board using the IC removing tool.
(5) Insert the new ROM, making sure that the notches on the ROM and IC
socket are aligned.
c) After replacement
(1) When a defective ROM is being replaced with a new ROM, turn the power
on after mounting on the SCNT board. This completes replacement.
(2) When the ROM is replaced for upgrading the software and upgrading
involves changing software switch settings such as service data, you must
perform the following operation.
• Perform All Clear operation. After you perform All Clear operation,
register the backed up data referring the list you printed out earlier.
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