Diagnostic information 2-25
5056-XXX
991 - Service Paper Option
992 - Temperature/Humidity Sensor Error
993 - CPU Error
Replace the printer controller board.
Step Questions/actions Yes No
1 POR the printer. Does the error return? Go to step 2. Problem solved.
2
Check connections CN3,4,5,17,18 on the printer
controller board. Are they properly connected?
Go to step 3. Properly connect
the connectors.
3
Are the size sensing levers bent or damaged? Replace the size
sensing levers.
Go to step 4.
4
Replace the CK 2 daughter board. Did this solve the
problem?
Problem solved. Go to step 5.
5
Are any actuators on the paper-feed unit damaged? Replace the
paper-feed unit.
Replace the
printer controller
board.
Step Questions/actions Yes No
1 Is connector CN18 on the CK1 daughter card board
connected properly?
Go to step 2. Plug the
connector in
securely.
2
Replace the temperature and humidity sensor (a
component of the paper feed gear). Did this fix the
problem?
Problem solved. Replace the
printer controller
board.
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