Toner Sensor Service Check; Transfer Corona Service Check - Lexmark 11A4006 - Optra K 1220 B/W Laser Printer Service Manual

Toner Sensor Service Check

An "Insert Print Unit or Toner" or "88 Toner Empty" message may
appear if the toner sensor cable is not seated correctly or if the cable
is defective.
FRU
1 Toner Sensor

Transfer Corona Service Check

Be sure you turn the printer off before you make any checks on the
transfer corona.
FRU
1 Transfer
Corona
2 HVPS
Action
Be sure the toner sensor cable is seated properly.
Check the voltage at CNTN-1 on the engine board.
If it is not +5 V dc, replace the engine board. If the
voltage is correct, check the voltage at CNTN-3. If it
is not ground, replace the engine board.
If the voltages are correct, replace the toner sensor.
Action
Check the transfer corona assembly for signs
of toner buildup and contamination. Use the
cleaning tool provided with the printer to clean
the wire. Check the wire for damage. The wire
should be positioned across the corona hous-
ing. Replace the corona if the wire is broken,
stretched, or loose.
Check the HVPS contacts for pitting or cables
interfering with the contacts. If correct and
replacing the transfer corona does not
improve the problem, replace the FRUs in the
following order:
1. HVPS
2. Interconnect Board
3. Engine Board
Diagnostic Information 2-29