Ricoh D093, Service Manual

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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.
ƒ 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.
ƒ MCU defective
ƒ PSU defective
ƒ 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.
ƒ Hot roller thermistor not positioned correctly
ƒ Fusing lamp harness loose, disconnected, defective
ƒ 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)
ƒ Thermistor connection loose, disconnected, defective
ƒ Hot roller thermistor not positioned correctly
ƒ Fusing lamp connections loose, disconnected, defective
ƒ MCU defective