AR-C150 (serv.man5). ARC150-Basic Manual - Sharp Copying Equipment Service Manual (repair manual). Page 54

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<2> In the case of the monochrome mode
The basic operations are the same as the color mode3. The following items differ in the color mode and in the monochrome mode. 
(Color mode)
In the case of the color mode, when the toner patch density is read by the image density sensor, the higher the developing bias is, the more the
toner quantity is, increasing reflection lights, resulting in an increased sensor output. 
(Monochrome mode)
In the case of the monochrome mode, on the contrary to the color mode, the higher the developing bias is, the more the toner quantity is and the
more the lights are absorbed, decreasing the reflection lights, resulting in a decreased sensor output. 
The above operation is performed for each color. 
DEVELOPING BIAS VOLTAGE CORRECTION(Black)
DEVELOPING BIAS VOLTAGE CORRECTION(Black)
Lower
Image patch density
15
Higher
0
100
200
300
400
500
600
Develping bias voltage
Limit(-600v)
PTK2/BS2(ID2)
PTK3/BS3(ID3)
PTK4/BS4(ID4)2
PTK2/BS2(ID2)
PTK5/BS5(ID5)
PTK6/BS6(ID6)
PT3/BS3(ID3)
CASE 2
K PAT TARGET
ID(Set by SIM44-4)
1st stage
Limit(-150v)
Correction voltage 1(PADVK1)
Correction voltage 2(PADVK2)
PTK1/BS1(ID1)
PTK1/BS1(ID1)
CASE 1
DEVELOPING BIAS VOLTAGE CORRECTION(Black)
DEVELOPING BIAS VOLTAGE CORRECTION(Black)
Lower
Image patch density
15
Higher
0
100
200
300
400
500
600
Develping bias voltage
Limit(-600v)
PTK2/BS2(ID2)1
PTK4/BS4(ID4)2
PTK2/BS2(ID2)2
PTK1/BS1I1D1)2
PTK6/BS6(ID6)2
PT3/BS3(I31)2
K PAT TARGET
ID(Set by SIM44-4)
Correction voltage 2(PADVK2)
Limit(-150v)
PTK3/BS3(I31)1
Correction voltage 1(PADVK1)
PTK5/BS5(ID5)2
PTK1/BS1(ID1)1
1st stage
2nd stage
AR-C150
3 – 7
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