Ricoh G147 Service Manual page 158

Main motor error
A main motor lock signal was not
440 D
detected within 2 sec. after the main
motor turned on.
New PCU error
The new unit detection sensor
switched ON for 2 sec. to detect a
442 D
new PCU while the main motor was
operating but the sensor did not go
OFF.
Feed Development Motor Error
The PLL lock signal remained LOW
450 D
for 2 s while the feed development
motor was operating.
Exhaust fan motor lock
An exhaust fan motor lock signal
490 D
was not detected within 5 sec. after
the exhaust fan motor turned on.
PCB cooling fan motor lock
492 D
A lock signal for the PCB cooling fan
motor lock signal was not detected
G147
Transfer belt position sensor
defective
Main motor overload
Main motor drive board defective
New unit detection sensor
defective
New PCU defective
Note: Normally the new unit
detection sensor goes on after a new
PCU is installed and then goes off
after the ID sensor and TD sensor
have been initialized.
Motor lock caused by overload.
Motor drive board defective.
Fan motor overloaded due to an
obstruction
Exhaust fan motor connector or
harness loose, broken, defective
Fan motor overloaded due to an
obstruction.
Fan motor connector or harness
loose, broken, defective
4-8 SM