Ricoh D093 - Fusing Temperature Warm-Up Error; Fusing Thermistor Errors

Service Call Tables
SM 7-23 D093/D094
Trouble-
Shooting
541 A Fusing Thermistor Errors
The thermistor measured the hot roller temperature every 1 sec. for 30 sec.
and the temperature remained below 5
o
C (54
o
F).
 Thermistor positioned incorrectly
 Thermistor cable loose, disconnected, damaged
 Thermistor defective
542 A Fusing Temperature Warm-up Error
The hot roller did not reach the ready temperature within 4 min. 30 sec. after
power on.
-or-
The hot roller did not reach 100°C within 130 sec. after power on.
 Fusing lamp connections loose, broken, defective
 Fusing lamp defective
 Thermistor not touching the hot roller
 Thermistor defective
 MCU defective
The ready temperature is determined by the state of the machine at
recovery:
 Ready Temp. = Target Fusing Temp. (if power on or recovery starts
when the hot roller is 80°C or higher).
 Ready Temp. = Target Fusing Temp. – 10°C (SP1105-1 default) if power
on or recovery starts when the hot roller is less that 80°C.
 Ready Temp. = Target Fusing Temp. – 20°C (SP1937-3 default) if power
on or recovery starts with pressure roller inching control on.