Toshiba e-STUDIO163, Service Manual

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e-STUDIO163/203 © 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
FUSER / EXIT UNIT
13 - 8
5) Fuser unit error status counter control
- To enhance the safety of the fusing section unit, SoC provides the following protection: When the
third [C41] error has occurred after two consecutive [C41] errors, the heater lamp is not turned
ON and error [C41] 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 [C41] to [C45] are displayed and still not cleared even though the thermistor,
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 0-19.
•
If the heater lamp does not turn ON and the service call [C41] 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, 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 “20” or over (e.g., 31), the data in SRAM or SRAM itself
may possibly have been ruined due to causes such as leakage from the chargers. Check the
bias, high-voltage transformers and charge wires to see if any of them is defective, and also
look through all the data in the SRAM.
• When the thermistors detect overheating, the SoC decides the error code and counter value
of the fuser unit error status, and turns OFF each output (the heater lamp, control panel dis-
play, motors and so on) to protect the fuser unit.
Error code: C44 ([CLEAR/STOP] and [8])
Counter value of the fuser unit error status: 9 (08-400)
Thermistors continue detecting the abnormal temperature even after the error codes and
counter values are decided. Even if the power is turned ON immediately, the heater lamp is
automatically turned OFF again when the surface temperature of the fuser roller is still higher
than the abnormal temperature detected.
Wait until the surface temperature of the fuser roller is lowered enough, and turn ON the
power to check the counter value. After confirming that it is the fuser unit abnormality, correct
the abnormality and reset the counter value (08-400) to “0” to start up the equipment normally.
06/04