Toshiba e-STUDIO5540C Service Manual page 280

Check if sounds are heard corresponding to proper solenoid operation (K: 03-212).
If such sounds are not heard, replace the solenoid and then perform "4. Image quality closed-
loop control (05-2742) / check the controlling status" (described later).
When an adjustment error occurs
Go to 3-2.
[ 3-2 ] If the drum surface potential sensor output is other than "0-30" and "1020-1020" in the
grid bias voltage of the target sensor
Is the main charger unit (K) installed correctly?
Is the needle electrode or the main charger grid (K) installed correctly?
Is there any charging leak?
Is the discharge LED harness (K) connected correctly?
YES  Remove any dust or toner staining. Then reinstall it.
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NO
Replace the photoconductive drum (K) and then perform "4. Image quality closed-loop control
(05-2742) / check the controlling status" (described later).
When an adjustment error occurs
Replace the drum surface potential sensor (K) and then perform "4. Image quality closed-loop
control (05-2742) / check the controlling status" (described later).
When an adjustment error occurs
Replace the drum surface potential sensor board and then perform "4. Image quality closed-
loop control (05-2742) / check the controlling status" (described later).
When an adjustment error occurs
Replace the EPU board and then perform "4. Image quality closed-loop control (05-2742) /
check the controlling status" (described later).
When an adjustment error occurs
Replace the LGC board and then perform "4. Image quality closed-loop control (05-2742) /
check the controlling status" (described later).
When an adjustment error occurs
Replace the high-voltage board and then perform "4. Image quality closed-loop control (05-
2742) / check the controlling status" (described later).
[ 4 ] What to do for the drum surface potential sensor shutter closing controlling
statuses abnormality
Content: Incorrect measurement when the drum surface potential sensor shutter is closed
<Example> The opened drum surface potential sensor shutter cannot be closed.
Repeat 2-1 above (sensor shutter not opened) and then perform "4. Image quality closed-loop control
(05-2742) / check the controlling status" (described later).
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If the discharge LED harness (K) is disconnected, reconnect it.
Perform "4. Image quality closed-loop control (05-2742) / check the
controlling status" (described later).
When an adjustment error occurs
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e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
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