Ricoh D129 Service Manual page 504

For the paper feed unit:

Defective tray lift motor or connector disconnection

Defective lift sensor or connector disconnection
For the LCT:

Defective tray lift motor or connector disconnection

Defective lift sensor or connector disconnection
5th tray lift malfunction (optional LCT)
For the two-tray paper feed unit:

If the upper limit of the LCT 1200-sheet is not detected within 8 seconds
when the tray lift motor is turned on to lift up the tray.

When the tray lowers, the tray lift sensor does not go off within 1.5 sec.
For the LCT:

505 B If the upper limit of the LCT 1200-sheet is not detected within 8 seconds
when the tray lift motor is turned on to lift up or lower the tray.

The tray lift sensor of the LCT 1200-sheet does not go off within 1.5
seconds when the tray lowers. If this condition occurs three consecutive
times, the SC is generated.

Tray lift motor defective or disconnected

Upper limit sensor defective or disconnected
Fusing exhaust fan motor error
The IOB does not receive the lock signal for10 seconds after turning on the
fusing exhaust fan.
530 D

Defective fusing exhaust fan motor or connector disconnection

Defective IOB

Disconnected harness
SM 6-15
Service Call Conditions
D129/D130