Toner Supply Amount - Ricoh FT8680 Service Manual

31 July 1995
7.2.3 ID Sensor Abnormal Conditions
a. Vsp Abnormal
If the measured Vsp is 1.4 V (when Vsg = 4 V) or more and this condition is
detected five times in a row, a system error condition will be indicated on the
CRT and the 7% fixed toner supply control will be used for the rest of the
copy run.
b. Vsg Abnormal
If the measured Vsg during ID sensor pattern detection is 2.5 V or less and
this condition is detected five times in a row, a system error condition will be
indicated on the CRT and the 7% fixed toner supply control will be used for
the rest of the copy run.
If both abnormal values return to normal during the copy run, the toner supply
control will also be returned to normal.

7.3 TONER SUPPLY AMOUNT

Vsp (V)
(at Vsg = 4.0 V)
0.3 ≤ Vsp < 0.4
0.4 ≤ Vsp < 0.5
0.5 ≤ Vsp
The toner supply ratio is determined based on the supply amount data in SP
mode and Vsp values as shown in the above table.
The table shows the amount for the A3/DLT mode. When smaller paper is
used, the supply amount becomes half.
The toner supply roller turns for a period based on the selected supply ratio.
TONER DENSITY DETECTION AND SUPPLY
Toner Supply Amount Data in SP Mode
15% 30%
7 15
15 30
30 45
2-49
45% 60%
15 30
45 45
60 60