Ricoh FT 4015 Service Manual page 194

COPY QUALITY
Yes
No
Is the exposure lamp light intensity too weak due to deterioration?
No
Replace the 1st scanner unit.
Is the signal at CN102-3 LOW after the
voltage is applied to the development roller.)
No
Replace the main board.
Replace the high voltage supply board C/G/B/T/S.
Is the cleaning blade worn?
No Yes
Replace the cleaning blade.
Are the erase lamp and/or quenching lamp dirty?
No Yes
Clean the erase lamp and quenching lamp, as required.
If toner scattering occurs, see 'Toner Density Too High'.
If dirty background occurs only in ADS mode, do the following:
If the ADS voltage is not within ± 0.2 volts of the standard voltage (2.5
•
V), readjust the ADS voltage.
•
If the signal at CN114-5 stays HIGH, check the harness and sensor,
and replace any defective parts.
•
If the signal at CN114-6 stays LOW, replace the main board.
Yes
Yes
key is pressed? (No bias
7-4
20 December 1996