Toshiba e-STUDIO4500c Service Manual page 429

April, 2007
SC543 A Heating roller thermistor 1 error 3: Software - High temperature
The thermistor detected a
temperature over 230 C.
Do SP5810 to cancel the SC fusing code.
SC544 A Heating roller thermistor 1 error 4: Hardware - High temperature
The thermistor detected a
temperature over 260 C.
Do SP5810 to cancel the SC fusing code.
SC545 A Heating roller thermistor 1 error 5: Lamp remains ON
After hot roller reaches warmup
temperature, the fusing lamps
remained ON at full capacity for
25 sec. after reaching the
warmup temperature while the
hot roller was not rotating.
Do SP5810 to cancel the SC fusing code.
SC546 A Heating roller thermistor 2 error 1: Thermistor disconnected
The temperature measured by
the heating roller thermistor
does not reach 0°C after 45 sec.
and remains over this
temperature for 10 readings.
SC547 A Zero cross error
When the main switch is turned ON, the
machine checks how many zero-cross
signals are generated within 500 ms. This
SC code is issued if the number of zero-
cross signals detected is either more than 66
or less than 45 for 10 readings.
Note: Zero cross signals, generated from an
ac power supply, are used to generate a
trigger pulses to control the applied power
accurately.
Normally, this SC is cancelled if you do SP5810 to cancel the SC fusing code.
SERVICE CALL CONDITIONS
TRIAC short
IOB defective
BICU defective
Fusing temperature out of control
TRIAC short
IOB defective
BICU defective
Fusing temperature control is erratic
Thermistor damaged, or out of position
Fusing lamp disconnected, broken
Loose connection of the heating roller
thermistor
Defective heating roller thermistor
4-51
Electrical noise on the power
supply line
Fusing relay damaged:
replace the PSU.