Ricoh D158 - Page 285

Service Call Conditions
D158/D159/D160/D161/D170 5-21 SM
Trouble-
shooting
No.
Definition
Symptom Possible Cause
542 A
Fusing reload failed (center) (D160/D161/D170)
NOT reaching the reload
temperature in 20 ms after
starting fusing lamp control.
 Defective thermistor
 Disconnected fusing lamp
543 A
Fusing overheat error (center)
The fusing temperature is
over 230°C for 1 second
(detected by the thermistor).
 Fusing thermistor
 Power supply board
544 A
Fusing overheat error (center) 2
The fusing temperature is
over 250°C for more than a
certain time (zero cross
signal x 3). (detected by the
fusing temperature monitor
circuit).
 Fusing thermistor
 Power supply board
545 A
Fusing lamp overheat error (center)
After the fusing temperature
reaches the target
temperature, the fusing
lamp does not turn off for 29
consecutive seconds.

Fusing thermistor defective or out of
position
 Power supply board
 Broken fusing lamp cables