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12 February 1992
Yes
No
Check the continuity between the development roller
shaft and the development bias terminal
Good
Repair the harness or terminals.
Is the signal at CN108-3 LOW after the start key is pressed?
Yes
Replace the main control board.
Replace the high voltage supply boar - CTBG.
Is the used toner tank full?
No
Yes
Empty the used toner tank, clean the cleaning unit, and reset the toner
'
end counter (SP83).
Is the cleaning blade or cleaning brush worn?
No
Yes
Replace the cleaning blade or the cleaning brush, or both.
Are the erase lamp, quenching lamp and/or toner shield glass dirty?
No
Yes
Clean the erase lamp, quenching lamp, the toner shield glass,
as required.
If toner scattering occurs, see the toner scattering section.
If dirty background occurs only in ADS mode, do the following:
If the ADS voltage (SP167) is not within 1.5 ± 0.1 volts standard volt-
•
age, readjust the ADS voltage (SP56).
Change the setting of ADS density (SP34) from 0 (Normal) to 2
•
(Lighter).
No good
No
6-7
COPY QUALITY
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