Sharp AR-810 Imager, Service Handbook

Page: 282 / 350

AR-651/810 TROUBLESHOOTING 5 - 132
Defective area Step Check Items Prescription Remarks
Main charger output 14 Is the setting value proper? If the setting value is out of
Is the main charger output normal? specification, adjust it.
If the output is not normal, check the
circuits. (Note 1)
Developer bias output 15 Is the setting value proper? If the setting value is out of
Is the developer bias output normal? specification, adjust it.
If the output is not normal, check the
circuits. (Note 1)
Transfer belt 16 Is there any foreign object or fiber, Remove it.
etc. on the belt surface?
Note 1:
If the output from the main charger, the developer bias or the transfer bias is abnormal, replace the high-voltage transformer with
a new one and output the chart again. If the output stays abnormal, check if the harness connecting the LGC board and high-
voltage transformer is open-circuited, if the power supply is normal and if the main charger wire is dirty.
Note 2:
Toner density correcting method
Change the setting value ‘Toner density life correction setting (08-414)’ (6 is the default setting.)
3: Appox. 1.5% lower than the current value 7: Appox. 0.3% higher than the current value
4: Appox. 0.8% lower than the current value 0: Appox. 0.5% higher than the current value
5: Appox. 0.3% lower than the current value 1: Appox. 0.8% higher than the current value
6: The current value (Default setting) 2: Appox. 1.5% higher than the current value
<Caution for correction>
When increasing or decreasing the toner density too much, the image may become poor or the life of developer material, cleaner,
photoconductive drum and fuser unit, etc. may shorten. Therefore it is not recommended to correct (to shift) the toner density
basically. If it is shifted, make sure that the image may be improper in a few minutes after shifting.