2WA/2NJ/2RK
7-477
C9540: Backup data error
When multiple parts are replaced at the same time, the internal data is changed and it interferes with the
machine operation. Consequently, the main unit cannot recover.
Step Check description Assumed cause Measures Reference
1 Checking the PWB Multiple PWBs were
replaced at the same time.
Recover to the original, if 2 or
more of the following related
parts were replaced at the
same time. • Related parts:
Memory, each PWB
2 Checking the unit Multiple units were
replaced at the same time.
Be sure not to perform the
following works at the same
time when the memory or
each PWB is replaced. •
Replacing the drum unit or
the developer unit • Relocat-
ing the drum units to other
colorspositioninsidea-
mainunit'
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