Troubleshooting For Surface Potential Control - Sharp AR-651 Service Handbook

5. 1. 17. Troubleshooting for surface potential control

[Corrective action when " Service Recommended for SPC" is blinked]
Check the control status of the surface potential sensor (05-242).
<When "4" is displayed: sensor error>
The sensor detection value is abnormal or the sensor output value is not changed even
though the main charger bias value is changed.
Is the connector of the surface potential sensor connected properly?
NO
Reconnect the connector and perform the "surface potential sensor control
check" (described later).
YES
Is the main charger grid/wire attached poorly?
Is the main charger attached poorly?
Are leaks and such occuring?
YES
After removing, if any, dust and correcting the defect, perform the "surface
potential sensor control check" (described later).
NO
Is the main charger grid bias output when the main charger grid bias output adjustment (05-210)
is performed?
Or, is the bias value is changed when the adjustment value is changed?
NO
1. Replace the high-voltage transformaer and perform the "surface potential
2. Replace the LCG board and perform the "surface potential sensor control
YES
Does the output value of the main charger grid bias consist with the setting value (within the
acceptable range)?
NO
Readjust the main charger grid bias output adjustment (05-210) and perform the
"surface potential sensor control check" (described later).
YES
Replace the surface potential sensor and perform the "surface potential sensor control check"
(described later).
Replace the LGC board and perform the "surface potential sensor control check" (described later).
sensor control check" (described later).
check" (described later).
5 - 105 AR-651/810 TROUBLE SHOOTING