Ricoh FT4460, Руководство по обслуживанию, Страница: 359 / 413

28 February 1989
1.17 TONER DENSITY TOO HIGH
- Phenomena -
Toner density is too high.
(1) A dirty background appears on the copy. Also, a 1 mm thick vertical
black line may appear.
(2) The image density of the black solid area is too high.
(3) Toner is built-up on the end block cover of the transfer/separating
corona unit and also on the upper cover of the development unit.
- Possible Causes -
1.
2.
3.
4.
5.
6 .
7.
Exposure lamp voltage is too high.
ID sensor bias voltage is too high.
Charge corona current is too low.
ID sensor grid voltage is too low.
Toner supply clutch keeps on turning continuously.
Copier is in fixed toner supply mode (black development).
In fixed toner supply mode, toner is supplied regardless of the actual
usage.
Consequently, excessive toner may be supplied depending on
customer’s originals.
Toner supply ratio is greater than the actual usage.
If the 45% supply in ID Mode is selected while 15% original is used, the
amount of toner supplied at one time (1 copy) is twice the actual
consumption. Selecting such a high supply ratio will cause toner
scattering inside the copier.
- Actions -
1. Check the following items by making a copy of the SP Mode Data Sheet
in SP Mode No.1.
No.31 Black Toner Supply Amount (ID sensor mode)
No.32 Black Toner Supply Amount (Fixed mode)
No.33 Black Toner ID Sensor Bias Adjustment
No.70 Color Toner Supply Amount (Fixed mode)
No.75 Color Toner Sensor Bias Adjustment
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