Diagnostic aids
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Step 1: Charge
Voltage is sent from the high-voltage power supply (HVPS) to the charge roll, which places a uniform negative
electrostatic charge on the surface of the drum. The drum surface is made of a photoconductive material that
holds an electrical charge as long as the drum is not exposed to light. Light striking the drum causes the surface
charge to neutralize.
The charge roll is a conductive roll that is positioned slightly above the surface of the drum. The HVPS supplies
the charge roll with two voltages: a negative DC charge voltage and an AC discharge voltage that is used for
electrically cleaning the drum.
HVPS
(-VDC)
(-VDC)
Ground
Conductive Tube
Photoconductive
Surface
0V
-VDC value
DRUM
Drum Surface
Voltage
Drum Surface
Image
Ground
Charge roll
HVPS
(-VDC)
(-VDC)
Ground
Conductive Tube
Photoconductive
Surface
0V
-VDC value
DRUM
Drum Surface
Voltage
Drum Surface
Image
Ground
Charge roll
Summary of Contents for X95 series
Page 26: ...xxvi Service Manual 7558 xxx Go Back Previous Next ...
Page 34: ...xxxiv Service Manual 7558 xxx Go Back Previous Next ...
Page 52: ...1 18 Service Manual 7558 xxx Go Back Previous Next ...
Page 464: ...3 112 Service Manual 7558 xxx Go Back Previous Next TTM theory of operations ...
Page 471: ...Diagnostic aids 3 119 7558 xxx Go Back Previous Next 3TM theory of operations ...
Page 477: ...Diagnostic aids 3 125 7558 xxx Go Back Previous Next 1TM theory of operations ...
Page 494: ...3 142 Service Manual 7558 xxx Go Back Previous Next ...
Page 506: ...4 12 Service Manual 7558 xxx Go Back Previous Next 6 Remove the operator panel top cover ...
Page 512: ...4 18 Service Manual 7558 xxx Go Back Previous Next 5 Remove the rear lower cover ...
Page 619: ...Repair information 4 125 7558 xxx Go Back Previous Next 4 Detach the media feed lift motor ...
Page 704: ...4 210 Service Manual 7558 xxx Go Back Previous Next 8 Remove the LED ...
Page 730: ...4 236 Service Manual 7558 xxx Go Back Previous Next 14 Remove the flatbed scanner assembly ...
Page 1038: ...6 12 Service Manual 7558 xxx Go Back Previous Next ...
Page 1076: ...7 38 Service Manual 7558 xxx Go Back Previous Next Assembly 37 TTM media feed 2 ...
Page 1112: ...7 74 Service Manual 7558 xxx Go Back Previous Next Assembly 71 Finisher punch 8 4 3 10 11 ...
Page 1158: ...7 120 Service Manual 7558 xxx Go Back Previous Next ...
Page 1168: ...I 10 Service Manual 7558 xxx Go Back Previous Next ...