Toshiba e-STUDIO 550, Service Manual

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JUNE 2002 © TOSHIBA TEC 14 - 9 e-STUDIO550/650/810 FUSER UNIT
(5) Error detection during warming up (2)
If the output voltage of either the center thermistor or side thermistor (rear) does not go over
approx. 1.9V(100°C) even in a certain period of time after it has exceeded 40°C or if it does not
go over approx. 3.2V(150°C) even in a certain period of time after it has exceeded 100°C, the “Call for
service” [C44] is displayed
(6) Error detection during warming up (3)
If the output voltage of the thermistor does not go over approx. 4.0V(200°C) even in a certain period
of time after it has exceeded 150°C, the “Call for service” [C44] is displayed.
(7) Abnormality detection during standby/copying
If the output voltage of either the center thermistor or side thermistor (rear) becames 0.5V or lower
for more than 0.5 sec., the “Call for service” [C43] is displayed, and if that of the side thermistor
(front) becomes 0.5V or lower for more than 0.5 sec., the “Call for service” [C45] is displayed.
(8) Fuser roller thermistor error status counter
• To enhance the safety of the fuser unit, CPU provides the following protection: When the third [C41]
error has occurred after two consecutive [C41] errors, even if an operator turns OFF the power and
back ON, the IH coil is not turned ON and error [C41] is displayed immediately.
However, if the copier becomes ready successfully with the fuser roller thermistor error status counter
“1” or below, the counter is cleared to “0”.
Note: If the heater is not turned ON and either of the error code [C41] to [C45] is still displayed even thougth the
thermistor, thermostat and IH coil have been repaired and the power is turned ON, check the code “400”
in the mode (08) to set the thermistor/heater status counter to “0”.
Reference
* The fuser roller thermistor error status counter does never have values other than 0 ~ 19 entered.
• If the fuser lamp does not turn ON and the “Call for service” [C41] is displayed immediately after
the power is turned ON, check the fuser roller thermistor error status counter. If it is “2” or over,
be sure to check the thermistor, thermostat and IH coil. Reset the counter to “0” (code “400” in
the (08) mode) after repairing them, then turn ON the power.
• If the fuser roller thermistor error status counter is “20” or over (e.g., 21), there is a possibility
that data in BCRAM or BCRAM itself may 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 BCRAM.
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