Ricoh D017 Service Manual page 391

Service Call Conditions
545 A Fusing overheat error 3 (center)
After warmup, the center of the hot
roller attained full operating
temperature and maintained this
temperature for 10 sec. without the hot
roller rotating.
547 B Zero cross signal detection error
Zero cross signals were not
detected within the prescribed
time.
551 A Fusing thermistor open (end)
The temperature of the
hot roller remained below
o
0 C for 5 sec. at the end
of the hot roller.
552 A Fusing temperature warm-up error (end)
The fusing temperature did not reach
the standby temperature within 20 sec.
at the center of the hot roller after the
main switch turned on.
D017/D018/D019/D020/D084/D085
Center hot roller thermistor
installed incorrectly,
disconnected.
Center hot roller thermistor
defective
PSU, BCU harness loose or
broken
PSU defective
BCU defective
Fusing thermistor out of its position
because of incorrect installation
Fusing thermistor disconnected or defective
Power supply not within rated range (15%
or more below rating)
Fusing thermistor defective or
out of position
Fusing lamp disconnected
Thermistor defective
Fusing lamp defective
3-16 SM Appendix