Toshiba e-STUDIO650 Service Handbook page 250

Defective area
Main charger output
Developer bias output
Transfer belt
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
4: Appox. 0.8% lower than the current value
5: Appox. 0.3% lower than the current value
6: The current value (Default setting)
<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.
e-STUDIO550/650/810 TROUBLESHOOTING
Step Check Items
14 Is the setting value proper?
Is the main charger output normal?
15 Is the setting value proper?
Is the developer bias output normal?
16 Is there any foreign object or fiber,
etc. on the belt surface?
7: Appox. 0.3% higher than the current value
0: Appox. 0.5% higher than the current value
1: Appox. 0.8% higher than the current value
2: Appox. 1.5% higher than the current value
Prescription
If the setting value is out of
specification, adjust it.
If the output is not normal, check the
circuits. (Note 1)
If the setting value is out of
specification, adjust it.
If the output is not normal, check the
circuits. (Note 1)
Remove it.
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Remarks
JUNE 2002 © TOSHIBA TEC