990-Transfer Drum Encoder Sensor (Hpsen) Service Check - Lexmark C720 Service Manual

5024-001
990—Transfer Drum Encoder Sensor (HPSEN) Service
Check
FRU
1 Transfer Drum
2 • Transfer Drum
Encoder Sensor
(HPSEN)
• IOD1 P.W.B. Board
• Main Engine (MCTL
P.W.B.) Board
3 Low Voltage Power
Supply (LVPS)
Action
Check the OPC belt cartridge for proper
installation.
The transfer drum should rotate with little
resistance.
If the transfer drum does not rotate lightly
or the encoder plate is damaged, replace
the transfer drum.
Ensure connectors DCN4 on the IOD1
board and the transfer drum encoder
sensor (HPSN) are correctly connected.
Check for +5V between DCN4-1 and
DCN1-3.
• If there is +5V, replace the transfer drum
encoder sensor (HPSEN)
• Check for +5V between DCN2-1 and
DCN2-4.
• If the voltage is +5V, replace the IOD1
P.W.B. board.
• If the problem still exists, replace the
main engine (MCTL P.W.B.) board.
If there is less than +5V between DCN2-1
and DCN2-4, replace the low voltage
power supply (LVPS).
Diagnostic Information
2-61