Toshiba e-STUDIO6520c - Scanning System Related Service Call

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ERROR CODE and TROUBLESHOOTING
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6.2.13 Scanning system related service call
[C260] Peak detection error
[C270] Carriage home position sensor not going OFF within a specified time/ Downloading
firmware with an incorrect model
Remove the original glass and move the carriages to the paper feeding side. Turn ON the power and
check the following items.
[C280] Carriage home position sensor not going ON within a specified time
Remove the original glass and move the carriages to the paper feeding side. Turn ON the power and
check the following items.
Does the exposure lamp light? (Perform the output check: 03-267)
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YES Æ 1. Check if the connectors on the CCD and SLG boards are disconnected.
2. Check if the shading correction plate is dirty.
3. Check if the conductor pattern on the CCD board is short circuited or open
circuited.
4. Check if the conductor pattern on the SLG board is short circuited or open
circuited.
5. Replace the lens unit.
6. Replace the SLG board.
NO
1. Check if the connectors of the exposure lamp and inverter are disconnected.
2. Check the SLG board if the connector pin CN21 is disconnected or the harness is short
circuited or open circuited.
3. Check if the conductor pattern on the SLG board is short circuited or open circuited.
4. Replace the SLG board.
5. Replace the inverter.
6. Replace the exposure lamp.
Are the carriages slightly moved to the feeding direction?/Are the carriages staying at a
position other than home position?
È YES Æ Check if the circuits of the SLG board are abnormal.
NO
1. Check if the connector pin is disconnected or the harness is short circuited or open
circuited.
2. Check if the conductor pattern on the SLG board is short circuited or open circuited.
3. Replace the SLG board.
4. If the model of the firmware downloaded is incorrect, a C270 error (exposure lamp blinks
twice) occurs.
If the exposure lamp blinks twice, download the correct ROM.
Do the carriages make a big noise after they arrive at the home position?
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YES Æ The carriage home position sensor is not turned ON.
1. Check if the connector of the sensor is disconnected.
2. Check if the circuits of the SLG board are abnormal.
NO
The carriages are stopped at the home position and do not move.
1. Check if the connector pins are disconnected or the harnesses are short circuited or open
circuited.
2. Check if the conductor pattern on the SLG board is short circuited or open circuited.
3. Replace the SLG board.