Ricoh D093 - Fusing Lamp Overheated: Error 2; Fusing Temperature Errors; Fusing Temperature: Error 1; Fusing Temperature: Error 2 (Hardware Detection)

Service Call Tables
D093/D094 7-24 SM
543 A Fusing Temperature: Error 1
The circuit on the MCU that monitors the temperature of the board detected
a fusing temperature of 230
o
C (446
o
F) for longer than 2 sec.
 MCU defective
544 A Fusing Temperature: Error 2 (Hardware Detection)
The fusing thermistor that monitors the temperature of the hot roller detected
a fusing temperature of 235
o
C (455
o
F), due to a Triac short which interfered
with fusing temperature control.
 MCU defective
 PSU defective
 Fusing unit defective
545 A Fusing Lamp Overheated: Error 2
After the hot roller reached the ready temperature, the fusing lamp stayed on
at full power for 50 sec. while the hot roller was not rotating.
 Hot roller thermistor not positioned correctly
 Fusing lamp harness loose, disconnected, defective
 MCU defective
546 A Fusing Temperature Errors
The machine detected that the fusing temperature was fluctuating out of
range for more than 60 sec. (7 readings detected temperature fluctuating
more than ±20
o
C)
 Thermistor connection loose, disconnected, defective
 Hot roller thermistor not positioned correctly
 Fusing lamp connections loose, disconnected, defective
 MCU defective