Ricoh FT 4015, Service Manual

Page: 44 / 229

1) Target Toner Sensor Voltage
- Method 1 -
Normally (if 0 or 2 is selected with SP30) the voltage is determined by the
following factors:
Target Toner Sensor Voltage (V
TS
) = Initial Developer Setting Voltage (V
T0
)
+
Toner Density Adjustment Factor
a) Initial Developer Setting Voltage (V
T0
)
This voltage is adjusted to 1.9
±
0.1 V during developer initialization
(refer to Toner Density Detection).
b) Toner Density Adjustment Factor
The target toner density can be changed by customers or service
engineers using SP mode 38 or user tool No. 6.
SP 38 Setting
User Tool 6
Setting
Toner Density
Toner Density
Adjustment Factor (
β
)
0 0 Normal 0
1 1 Darker –S x 1/2
2 2 Lighter +S x 1/2
3 Darkest –S
4 Lightest +S
S: TD Sensor Sensitivity (SP36) Default: Normal
The sensor sensitivity is stored in SP36.
TD Sensor Sensitivity (S) [V/wt%] =
Change of TD sensor output [V]/Change of toner density [wt%] =
SP36 setting x 0.05 [V] (Default: SP36 = 15)
- Method 2 -
If 1 or 3 is selected with SP30, the setting of SP53 is used as the target toner
sensor voltage. In this case, the target toner sensor voltage is determined by
the following formula:
Target Toner Sensor Voltage = SP53 setting x 0.02 [V] (Default: 97 = 1.94 V)
The TD sensor initial setting is not changed by this SP mode. However, it is
ignored if method 2 is selected.
TONER SUPPLY 20 December 1996
2-30