Ricoh A-P4, Service Manual

Page: 154 / 381

442 D
New PCU error • New unit detection sensor defective
• New PCU defective
Note: Normally the new unit detection sen-
sor goes on after a new PCU is installed and
then goes off after the ID sensor and TD
sensor have been initialized.
The new unit detection sensor switched ON
for 2 sec. to detect a new PCU while the
main motor was operating but the sensor
did not go OFF.
450 D
Feed Development Motor Error
• Motor lock caused by overload.
• Motor drive board defective.
The PLL lock signal remained LOW for 2 s
while the feed development motor was op-
erating.
490 D
Exhaust fan motor lock
• Fan motor overloaded due to an ob-
struction
• Exhaust fan motor connector or har-
ness loose, broken, defective
An exhaust fan motor lock signal was not
detected within 5 sec. after the exhaust fan
motor turned on.
492 D
PCB cooling fan motor lock
• Fan motor overloaded due to an ob-
struction.
• Fan motor connector or harness loose,
broken, defective
A lock signal for the PCB cooling fan motor
lock signal was not detected within 5 sec-
onds after the cooling fan motor turned on.
501 B
1st tray lift malfunction
The paper height sensor did not activate after the tray lift motor was on for 10 sec.
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 sec. after the paper bottom plate starts to drop. If it does not
deactivate within 5 sec. after four attempts, a message will prompt the user to reset Tray
1. After two attempts to release the error by re-setting the paper tray, if this does not solve
the problem then this SC is displayed.
• Lift motor connector or harness loose, broken, defective.
• Lift motor defective
• Height sensor connector or harness loose, broken, defective
• Height sensor defective
• Loose paper or other obstruction between the tray and motor
Service Call Conditions
153
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