Ricoh B286, Service Manual, Page: 226 / 622

SC Code Descriptions
B286/B289 4-8 SM
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-
After 5 sec. and 5 rotations of the hot
roller, the machine detected that the
temperature rise was less than 3
o
C .
!
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.
543 A Fusing Lamp Overheated: 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
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