2 Check the connector of M23 for proper drive coupling and correct as necessary. Remedy: 1 Check the M23 connector for proper connection and correct as necessary.

Causes: Tray 3 upper limit sensor (PS22) Tray 3 lift-up motor (M23) Paper feed/transport drive board (PFTDB) Printer control board (PRCB).The tray 3 upper limit sensor is not blocked even after the lapse of a given period of time after the lifting motion has been started.Description: Tray 3 feeder up/down abnormality.3 PS14 I/O check, sensor check PFTDB CN10-10 (ON) Q-4 4 M8 operation check PFTDB CN22-9 to 10 X-4 5 Change M8 - 6 Change PFTDB - 7 Change PRCB 2 Check the connector of M8 for proper drive coupling and correct as necessary. Remedy: 1 Check the M8 connector for proper connection and correct as necessary.Causes: Tray 2 upper limit sensor (PS14) Tray 2 lift-up motor (M8) Paper feed/transport drive board (PFTDB) Printer control board (PRCB).The tray 2 upper limit sensor is not blocked even after the lapse of a given period of time after the lifting motion has been started.Description: Tray 2 feeder up/down abnormality.3 PS6 I/O check, sensor check PFTDB CN11-3 (ON) Q-1 4 M6 operation check PFTDB CN23-9 to 10 X-3 5 Change M6 - 6 Change PFTDB - 7 Change PRCB 2 Check the connector of M6 for proper drive coupling and correct as necessary. Remedy: 1 Check the M6 connector for proper connection and correct as necessary.Causes: Tray 1 upper limit sensor (PS6) Tray 1 lift-up motor (M6) Paper feed/transport drive board (PFTDB) Printer control board (PRCB).The tray 1 upper limit sensor is not blocked even after the lapse of a given period of time after the lifting motion has been started.Description: Tray 1 feeder up/down abnormality.

The lock signal remains LOW for a predetermined continuous period of time while the motor remains stationary.

Description: Tray 3/4 feeder transportation motor turning at abnormal timing.

3 M25 operation check PFTDB CN13-6 (LOCK) X-11 4 Change M25 - 5 PFTDB ICP6 conduction check - 6 Change PFTDB - 7 Change PRCB 2 Check the connector of M25 for proper drive coupling and correct as necessary.

Remedy: 1 Check the M25 connector for proper connection and correct as necessary.

Causes: Transport motor (M25) Paper feed/transport drive board (PFTDB) Printer control board (PRCB).

The lock signal remains HIGH for a predetermined continuous period of time while the motor remains stationary.Description: Tray 3/4 feeder transportation motor failure to turn.

Bizhub c452 code p6