Ricoh D017 Service Manual page 390

541 A Fusing thermistor open (center)
The temperature of the
hot roller remained below
o
0 C for 5 sec at the center
of the hot roller.
542 A Fusing temperature warm-up error (center)
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.
543 A Fusing overheat error 1 (center)
The fusing thermistor detected a fusing
temperature over 230°C for 5 sec. at
the center of the hot roller.
544 A Fusing overheat error 2 (center)
A fusing temperature over 250°C is
detected at the center of the hot roller
by the fusing temperature monitor
circuit in the BCU board.
The power was interrupted for more
than 0.3 sec.
SM Appendix
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
TRIAC short on PSU (PSU
defective)
BCU board defective
Fusing thermistor defective
TRIAC short on PSU (PSU
defective)
BCU board defective
Fusing thermistor defective
Power supply voltage unstable
3-15 D017/D018/D019/D020/D084/D085
Service Call Conditions