Toshiba E-STUDIO520, Service Manual, Page: 393 / 592

March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 TROUBLESHOOTING
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[C490] IH control circuit abnormality or IH coil abnormality
1. Check the power voltage
Is the voltage normal? (Is the voltage during the operation ±10% of the rated voltage?)
2. Check the IH control board
(1) Check if the harness of IH coil is loosened.
(2) Check if the conductor pattern on the board is short circuited or open circuited.
(3) Replace the IH control board.
3. Check the IH coil
(1) Check if the coil is broken or shorted.
(2) Replace the IH coil.
4. Clear the status counter
Change the current status counter value (08-400) "17" to "0".
[C47X], [C481] and [C490] can be cleared by turning OFF and ON the main switch as long as the prob-
lem was solved, and the status counter does not have to be changed to "0".
The value of the status counter remains until the next service call overwrites the value.
[C4A0] End of cleaning web
(1) Check if the cleaning web is remaining.
(2) Check if the connector CN332 on the LGC board is not disconnected.
(3) Check if there is no abnormality at the web sensor.
(4) Replace the LGC board.
[C4B0] IGBT overheating abnormality
1. Check the LGC board
(1) Check if the conductor pattern on the board is short circuited or open circuited.
(2) Check if NVRAM is mounted.
(3) Replace the LGC board.
2. Clear the status counter
Change the current status counter value (08-400) "30 or more" or "4" to "0".
[CD50] Web motor signal path abnormality
(1) Check if the connector of the web motor and connector pins are not disconnected.
(2) Check if the harness at the fuser unit is not open-circuited.
(3) Check if the connector of the LGC board and connector pins are not disconnected.
(4) Check if the harness between the connector of the LGC board and the fuser unit is not open cir-
cuited.
(5) Replace the LGC board.
(6) Replace the fuser unit.