Toshiba e-STUDIO5540C Service Manual page 279

| Connector between the V0S board and the EPU board
| Connector between the drum surface potential sensor and the V0S board
| Connector between the drum shutter solenoid and EPU board
| Connectors CN308 and CN310 of the LGC board
NO 
|
YES
Check the drum surface potential sensor output (05-2782).
Check the values of the sub codes "3", "8" and "13" in the following list.
Perform 3-1 or 3-2 according to the output value.
Sub-code Color
0 Y
1 M
2 C
3 K
5 Y
6 M
7 C
8 K
10 Y
11 M
12 C
13 K
[ 3-1 ] If the drum surface potential sensor output is "0-30" or "1010-1020" in the grid bias
voltage of the target sensor, the drum surface potential sensor shutter may become
closed.
Is the shutter opened and closed smoothly when the arm of the drum shutter solenoid is moved
by hand and is the detecting element of the drum surface potential sensor (2 mm) seen
completely when the drum shutter is opened?
NO 
|
|
|
|
|
|
|
|
|
YES
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Reconnect the connector when it is disconnected. Then perform image
quality closed-loop control (05-2742) and check the controlling status.
Grid bias Voltage
measurement [-V]
300
900
500
If the sensor or the shutter is dirty, wipe off with soft pad or cloth.
If a spring or any part connecting the solenoid and the shutter has been
removed, reinstall it securely.
Then perform "4. Image quality closed-loop control (05-2742) / check the
controlling status" (described later).
When an adjustment error occurs
Replace the shutter and then perform "4. Image quality closed-loop control
(05-2742) / check the controlling status" (described later).
When an adjustment error occurs
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