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24 June 1994
K
Normal or Darker (SP34 = 0 or 1)
K ≥ TL1
TL1 > K ≥ TL2
TL2 > K ≥ TL3
TL3 > K ≥ TL4
TL4 > K ≥ TL5
TL5 > K
ADS Output Voltage (Peak Hold Voltage)
K =
ADS Reference Voltage (SP56)
TL1 to TL5: Threshold level (See the following table.)
To maintain the correct image density, the exposure lamp data is
incremented when the reproduction ratio is changed or the V
applied. This increment in the lamp data increases the intensity of light
reflected from the original. Therefore, the auto ID sensor output voltage also
changes. In order to maintain a constant voltage for the same original when
the lamp data is incremented, the threshold levels are shifted up with each
increment in the lamp data as shown in the following table.
Increase of
exposure lamp data
TL1
0.80
TL2
0.75
TL3
0.70
TL4
0.61
TL5
0.29
5.4.3 Image Bias Voltage Adjustment Factor
Image Bias Adjustment (SP37)
Image density
Normal
Darkest
Darker
Lighter
Lightest
The image bias voltage can be changed by SP37 to adjust the image density
level. The above table gives the image bias voltage for SP mode setting. This
adjustment should be done only if the exposure lamp voltage adjustment
(SP48) fails to achieve the desired image density.
Base Bias Voltage (volts)
–160
–200
–240
–280
–320
–360
+0
+2
+4
+6
+1
+3
+5
+7
0.85
0.90
0.95
0.80
0.84
0.88
0.74
0.78
0.82
0.65
0.69
0.73
0.31
0.33
0.35
Data (SP37)
Change of bias voltage (volts)
0
1
2
3
4
2-29
Lighter (SP34 = 2)
–200
–240
–280
–320
–360
–400
correction is
L
+8
+10
+12
+14
+9
+11
+13
+15
1.00
1.05
1.11
1.16
0.92
0.97
1.01
1.06
0.86
0.90
0.94
0.99
0.77
0.81
0.84
0.88
0.37
0.38
0.40
0.42
±0
+40
+20
–20
–40
DEVELOPMENT
+16
+18
+17
+19
1.20
1.23
1.11
1.16
1.03
1.08
0.92
0.96
0.44
0.46
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