Toner Density Control - Ricoh FW780 Service Manual

4.4 TONER DENSITY CONTROL

The toner supply amount ratio is determined by the following conditions.
TS 0 ~ 50 sheets
Level (~ 30 m)
0 V < 4.25
TS
4.25 V <
TS
1
4.30
4.30 V <
TS
2
4.35
N
4.35 V <
TS
3
4.40
4.40 V <
TS
4
4.45
5 4.45 V
TS
V < 4.35
0
TS
4.35 V <
TS
1
4.38
4.38 V <
TS
2
4.40
L
4.40 V <
TS
3
4.42
4.42 V <
TS
4
4.45
5 4.45 V
TS
0 V < 4.00
TS
4.00 V <
TS
1
4.10
4.10 V <
TS
2
4.20
H
4.20 V <
TS
3
4.30
4.30 V <
TS
4
4.40
5
4.40 V
TS
TS Level (Toner Supply Ratio)
0: No supply 1: 7.5%
The toner density sensor is used for toner density control. It measures the ratio of
toner to carrier in the developer.
Toner is supplied every 600 mm when the toner density sensor value (V
meets one of the TS level conditions from 1 to 5. The triboelectric charge
generated on the toner and carrier become greater in accordance with the copy
quantity and is stabilized after 250 copies. To compensate the triboelectric
charge characteristic, the value of the toner supply control changes as shown.
During the initial conditioning, the main motor rotates the development unit to
stabilize the triboelectric charge generated on the toner and carrier and the toner
density sensor is automatically adjusted to 4.0 0.1V using new developer. The
initial conditioning (SP36) must be performed whenever the developer is replaced.
SM
51 ~ 100 101 ~ 150
sheets sheets
(30 ~ 60 m) (60 ~ 90 m)
V < 4.00 V < 3.50
TS TS
4.00 V < 3.50 V
TS
4.10 3.80
4.10 V < 3.80 V
TS
4.20 4.10
4.20 V < 4.10 V
TS
4.30 4.20
4.30 V < 4.20 V
TS
4.40 4.35
4.40 V 4.35
TS
V < 4.30 V < 4.25
TS TS
4.30 V < 4.25 V
TS
4.33 4.30
4.33 V < 4.30 V
TS
4.36 4.33
4.36 V < 4.33 V
TS
4.40 4.36
4.40 V < 4.36 V
TS
4.43 4.40
4.43 V 4.40 V
TS
V < 3.50 V < 3.00
TS TS
3.50 V < 3.00 V
TS
3.80 3.50
3.80 V < 3.50 V
TS
4.10 4.00
4.10 V < 4.00 V
TS
4.20 4.20
4.20 V < 4.20 V
TS
4.35 4.30
4.35 V 4.30
TS
2: 15% 3: 30%
2-16
151 ~ 200
sheets
(90 ~ 120 m)
V < 3.00
TS
< 3.00 V <
TS TS
3.50
< 3.50 V <
TS TS
4.00
< 4.00 V <
TS TS
4.20
< 4.20 V <
TS TS
4.30
V 4.30 V
TS TS
V < 3.75
TS
< 3.75 V <
TS TS
4.00
< 4.00 V <
TS TS
4.10
< 4.10 V <
TS TS
4.20
< 4.20 V <
TS TS
4.38
4.38 V
TS TS
V < 2.50
TS
< 2.50 V <
TS TS
3.00
< 3.00 V <
TS TS
3.50
< 3.50 V <
TS TS
4.00
< 4.00 V <
TS TS
4.25
V 4.25 V
TS TS
4: 50% 5: 100%
201 ~ 250
251 sheets ~
sheets
(150 m ~)
(120 ~ 150 m)
V < 2.50 V < 2.0
TS TS
2.50 V < 2.00 V
TS
3.00 2.40
3.00 V < 2.40 V
TS
3.50 2.80
3.50 V < 2.80 V
TS
4.00 3.20
4.00 V < 3.20 V
TS
4.25 3.60
4.25 V 3.60
TS
V < 3.25
V < 2.75
TS TS
3.25 V <
2.75 V
TS
3.50 <3.20
3.50 V <
3.20 V
TS
3.80 3.60
3.80 V <
3.60 V
TS
3.90
4.00
4.00 V <
3.90 V
TS
4.30
4.35
4.35 V
4.30 V
TS
V < 2.00 V < 1.50
TS TS
2.00 V < 1.50 V
TS
2.40 2.00
2.40 V < 2.00 V
TS
2.80 2.50
2.80 V < 2.50 V
TS
3.20 3.00
3.20 V < 3.00 V
TS
3.60 3.50
3.60 V 3.50 V
TS
)
TS
<
TS
<
TS
<
TS
<
TS
V
TS
TS
<
TS
<
TS
<
TS
TS
<
TS
<
TS
<
TS
<
TS
TS
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