2-32 Service Manual
5021-0XX
5 If waste toner bottle is
removed, reinsert it.
Ensure rear cover
assembly cover is shut.
Override top and front
cover interlock switches.
For location, see
“Interlock switch
locations” on page 5-8.
Reconnect operator panel.
Turn printer on. Does 902
error reappear?
Go to step 6. Problem solved.
6 Turn printer off and remove
engine controller board
shield. See “Engine
controller board removal”
on page 4-55 for steps to
remove shield. Check cable
that connects I2CN on
engine controller board to
DCN3 on I/O board for
proper connection,
damage, pin shorting and
continuity. Is cable okay?
Replace engine
controller board.
See “Engine
controller
board removal”
on page 4-55.
Replace cable.
Step Questions / actions Yes No
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