Toshiba e-STUDIO2500c, Руководство по обслуживанию, Страница: 333 / 402

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May 2006 © TOSHIBA TEC e-STUDIO2500c/3500c/3510c FUSER UNIT / PAPER EXIT SECTION
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[ 2-6 ] Fuser unit error status counter control
• To enhance the safety of the fusing section unit, engine CPU provides the following protection:
When the third [C411] error has occurred after two consecutive [C411] errors, the heater lamp is not
turned ON and error [C412] is displayed immediately even if an operator turns OFF the power and
back ON. However, if the equipment goes into a ready state normally with the fuser unit error status
counter "1" or below, the counter is cleared to "0".
• If the error codes [C411] to [C468] are displayed and still not cleared even though the thermistor,
thermopile, thermostat and heater lamp have been repaired (and the power ON/OFF does not clear
the error), check the Setting Mode (08-400) to set the fuser unit error status counter to "0".
Remark:
The fuser unit error status counter (Setting Mode (08-400)) never has values other than 0 to 34.
• If the IH coil does not turn ON and the service call [C411] or [C412] is displayed immediately after
the power is ON, ensure the fuser unit error status counter is "2" or over. If it is "2" or over, be sure to
check the thermistor, thermopile, thermostat and heater lamp. Reset the counter to "0" after repair-
ing them, then turn ON the power.
• If the fuser unit error status counter is "35" or over (e.g., 40), the data in NVRAM or NVRAM itself
may possibly have been ruined due to causes such as leakage from the chargers.
Check the bias, high-voltage transformers and needle electrodes to see if any of them is defective,
and also look through all the data in the NVRAM.
• When the thermistors detect overheating, the engine CPU decides the error code and counter value
of the fuser unit error status. After turning OFF each output (the heater lamp, exposure lamp, control
panel display, motors and so on), the engine CPU turns OFF the power to protect the fuser unit.
Error code: C449, C468 ([C] and [8])
Counter value of the fuser unit error status: 8, 9, 18 to 23, 25 to 29 (08-400)
Thermistors and thermopiles continue detecting the abnormal temperature even after the error
codes and counter values are decided. Even if the power is turned ON immediately, it is automati-
cally turned OFF again when the surface temperature of the fuser belt is still higher than the abnor-
mal temperature detected.
Wait until the surface temperature of the fuser belt is lowered enough, and turn ON the power to
check the counter value while it is turned OFF again. After confirming that it is the fuser unit abnor-
mality, correct the abnormality and reset the counter value (08-400) to "0" to start up the equipment
normally.