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November 2003 © TOSHIBA TEC 5 - 49 e-STUDIO3511/4511 TROUBLESHOOTING
[C480] Overheating of IGBT
1. Check the operation of the IH control board cooling fan
Check if the IH control board cooling fan is rotating normally. (Is the connector securely connected?)
2. Check the IH board
(1) Check if the IGBT or IGBT radiation plate is normal. (Is the radiation plate securely attached?)
(2) Check if the conductor pattern on the board is short circuited or open circuited.
(3) Replace the IH board.
3. Clear the status counter
Change the values “12”, “15” or “18” of the status counter (08-400) to “0”.
* The status counter value is as follows in the following cases. Change them to "0" respectively.
• The error occurred before the temperature of the fuser roller reaches 40°C: "12"
• The error occurred before the equipment has become ready: "15"
• The error occurred when the equipment is in the ready state: "18"
(When the only one side of IH coil is energized continuously for 15 seconds)
[C490] IH control circuit or IH coil abnormality
1. Check the IH board
(1) Check if the conductor pattern on the board is short circuited or open circuited.
(2) Replace the IH board.
2. Check the IH coil
(1) Check if the coil is broken or short out.
(2) Replace the IH coil.
3. Clear the status counter
Change the values “13”, “16” or “19” of the status counter (08-400) to “0”.
* The status counter value is as follows in the following cases. Change them to "0" respectively.
• The error occurred before the temperature of the fuser roller reaches 40°C: "13"
• The error occurred before the equipment has become ready: "16"
• The error occurred when the equipment is in the ready state: "19"
When the problem is solved, [C470], [C480] and [C490] can be cleared by turning OFF and
ON the main switch so the status counter does not have to be changed to "0".
The value of the status counter remains the same until the next service call overwrites the value.