Toshiba e-STUDIO5540C Service Manual page 283

check the content and the station of the abnormality on the control status and
then press [CANCEL] at the bottom left of the screen.
* When any of the drum surface potential sensor controlling statuses (display on the upper row) is "2:
Sensor abnormality detected", drum surface potential sensor shutter closing controlling status will
not be identified. (The display on the lower row is "0: Normally completed".)
Upper row: Drum surface potential
sensor controlling status
<Contents>
The contents same as 05-2780 sub-code
3:K
0: Normally completed
1: Control paused
(due to an open cover, etc.)
2: Sensor abnormality detected
When any of the drum surface potential sensor controlling statuses (display on the upper row) is "2:
Sensor abnormality detected", drum surface potential sensor shutter closing controlling status will not
be identified. (The display on the lower row is "0: Normally completed".)
If the "Image quality closed-loop control (05-2742)" is performed while "0: Disabled" is selected for 08-
2561 (Drum surface potential control setting), drum surface potential control measurement will not be
performed. However, the controlling status of the last drum surface potential sensor measurement and
"ERROR" are displayed.
(All status values on both upper and lower rows may be "0" and also "ERROR" may be displayed.)
When any of the controlling statuses on the upper row is "2" while "ERROR" is being displayed  Go to
2.
When any of the controlling statuses on the lower row is "2" while "ERROR" is being displayed  Go to
3.
When any of service calls CE10, CE20 and CE40 is displayed  Go to 5.
[ 2 ] What to do for the drum surface potential sensor controlling status abnormalities
Content: Incorrect measurement when the drum surface potential sensor shutter is opened
<Example>
The harness of the drum surface potential sensor is disconnected.
The drum surface potential sensor shutter is not opened.
The drum surface potential sensor is installed incorrectly.
Charging of the photoconductive drum is abnormal (e.g. abnormalities in the drum, main
charger, discharge LED, HVT board).
Apply following measures respectively and perform "4. Image quality control initialization (05-
2742) and checking controlling status" (described later).
[ 2-1 ] Checking connector related troubles
Are the harnesses of the troubled drum surface potential sensor connected? Are the boards
connected with the sensor correctly?
| 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 the EPU board
| Connectors CN308 and CN310 of the LGC board
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
ERROR CODE and TROUBLESHOOTING
Lower row: Drum surface potential sensor
shutter closing
controlling status
<Contents>
The contents same as 05-2789 sub-code
3:K
0: Normally completed
1: Control paused
(due to an opened cover, etc.)
2: Sensor shutter closing abnormality detected
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