Ricoh G147 Service Manual page 160

Lift motor defective
Height sensor connector or harness loose, broken, defective
Height sensor defective
Loose paper or other obstruction between the tray and motor
Pick-up solenoid connector or harness loose, broken, or defective
Pick-up solenoid defective
3rd tray lift malfunction (optional paper tray unit)
The paper height sensor is not activated after the tray lift motor has been on
for 13 seconds.
Note: Normally, if the power switch is turned on when the paper is already at
the feed height, the paper height position is detected again. At this time, the
paper height sensor should de-activate within 5 seconds after the paper
bottom plate starts to drop. If it does not deactivate within 5 s after four
503 B
attempts, the tray lift motor halts. After two attempts to re-set the paper tray,
if this does not solve the problem, then this SC is displayed and tray control
halts.
Lift motor connector or harness loose, broken, defective.
Lift motor defective
Height sensor connector or harness loose, broken, defective
Height sensor defective
504 B 4th tray lift malfunction (optional paper tray unit)
The paper height sensor is not activated after the tray lift motor has been on
for 13 seconds.
Note: Normally, if the power switch is turned on when the paper is already at
the feed height, the paper height position is detected again. At this time, the
paper height sensor should de-activate within 5 seconds after the paper
bottom plate starts to drop. If it does not deactivate within 5 s after four
attempts, the tray lift motor halts. After two attempts to re-set the paper tray,
if this does not solve the problem, then this SC is displayed and tray control
halts.
G147 4-10 SM