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Symptom tables
POST symptom table
Note: Investigate any displayed codes before proceeding with these symptoms. For example, a missing toner cartridge will
prevent POST from completing.
984.xx Invalid command parameter received by the specidied
device
Call the next level of support.
990.xx An equipment check condition has occurred in the
specified device, but the device is unable to identify the
exact component failure.
991.xx The specified device has detected an equipment check
in its system card.
Symptom Action
The main motor, cooling fan, and fuser do not come
on.
See “Cover interlock switch service check” on page 2-23.
POST completes, but the LCD does not come on. See “Operator panel service check” on page 2-27.
Main motor does not come on. See “Main motor service check” on page 2-26.
Fan does not come on. See “Cooling fan service check” on page 2-23.
Fuser does not cycle. See “Fuser service check” on page 2-25.
Fuser does not turn on and off. See “Fuser service check” on page 2-25.
The paper feed picks and tries to feed media. See “Paper feed service checks” on page 2-27.
Error Description Action
2-20