3-62
Service Manual
7558-
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Service tips
•
If the surface of the charge roller is damaged (for example, if it has a nick or a pit), it will cause
the charge to be uneven on the photoconductor. This will cause a repeating mark on the
printed page. Check the service manual for the repeating marks table.
•
If the charge roller is severely damaged, the surface of the photoconductor will not be charged
properly, and heavy amounts of toner will be deposited on the photoconductor. This will cause
the printed page to be saturated with 100% of each color. The imaging basket will need to be
replaced sooner.
Step 2: Exposure
The printhead LED generates a scan line of LED light. Image data received from the RIP card assembly
modulates this scan line, turning it on and off according to image information that is received from the host
computer and software.
Through the use of a series of rotating and stationary mirrors within the printhead, the scan lines are applied on
the negatively charged drum surface. Whenever the print controller sends a command to print a black pixel, the
printhead LED switches on long enough to shine onto the drum at a single pixel point. That point is now
discharged and slightly less negative than the surrounding negative charge. The less negative areas are
considered positive. This discharge/no discharge process creates an invisible, electrostatic image on the
surface of the drum. This image is called a
latent
image.
LED Light
0V
DRUM
Drum Surface
Image
Drum Surface
Voltage
Laser Beam
Discharge
Level
Invisible Latent Image
Laser Beam
Printhead
Содержание X95 series
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Страница 464: ...3 112 Service Manual 7558 xxx Go Back Previous Next TTM theory of operations ...
Страница 471: ...Diagnostic aids 3 119 7558 xxx Go Back Previous Next 3TM theory of operations ...
Страница 477: ...Diagnostic aids 3 125 7558 xxx Go Back Previous Next 1TM theory of operations ...
Страница 483: ...Diagnostic aids 3 131 7558 xxx Go Back Previous Next High capacity feeder theory of operations ...
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Страница 506: ...4 12 Service Manual 7558 xxx Go Back Previous Next 6 Remove the operator panel top cover ...
Страница 512: ...4 18 Service Manual 7558 xxx Go Back Previous Next 5 Remove the rear lower cover ...
Страница 528: ...4 34 Service Manual 7558 xxx Go Back Previous Next 8 Disconnect all the cables from the bridge PCBA ...
Страница 586: ...4 92 Service Manual 7558 xxx Go Back Previous Next 10 Remove the duct from the machine 11 Release the two hooks ...
Страница 619: ...Repair information 4 125 7558 xxx Go Back Previous Next 4 Detach the media feed lift motor ...
Страница 704: ...4 210 Service Manual 7558 xxx Go Back Previous Next 8 Remove the LED ...
Страница 730: ...4 236 Service Manual 7558 xxx Go Back Previous Next 14 Remove the flatbed scanner assembly ...
Страница 734: ...4 240 Service Manual 7558 xxx Go Back Previous Next 5 Disconnect the cable B 6 Remove the tension spring C ...
Страница 801: ...Repair information 4 307 7558 xxx Go Back Previous Next 5 Disconnect the cable B 6 Remove the bridge drive motor ...
Страница 953: ...Repair information 4 459 7558 xxx Go Back Previous Next 7 Remove sensor tray 5 pre feed C A C B Connector ...
Страница 1004: ...5 34 Service Manual 7558 xxx Go Back Previous Next P J675 2 P J676 3 P904 15 Plug Jack Callout Plug jack description Connects to ...
Страница 1038: ...6 12 Service Manual 7558 xxx Go Back Previous Next ...
Страница 1076: ...7 38 Service Manual 7558 xxx Go Back Previous Next Assembly 37 TTM media feed 2 ...
Страница 1112: ...7 74 Service Manual 7558 xxx Go Back Previous Next Assembly 71 Finisher punch 8 4 3 10 11 ...
Страница 1148: ...7 110 Service Manual 7558 xxx Go Back Previous Next Assembly 103 continued High capacity feed HCF media tray lift 2 1 4 6 7 5 3 ...
Страница 1150: ...7 112 Service Manual 7558 xxx Go Back Previous Next Assembly 104 High capacity feed HCF media feed unit 1 4 3 5 6 7 2 1 ...
Страница 1152: ...7 114 Service Manual 7558 xxx Go Back Previous Next Assembly 105 High capacity feed HCF media feed unit 2 1 2 3 4 7 6 5 ...
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