Electrophotographic process (EP process)
Printhead
The printhead scans the photo conductor drum surface with a laser beam. It consists of the following
components:
•
Laser diode (LD) card assembly
•
Oscillator
•
Start of scan card assembly
When a laser beam is scanned across the photoconductor drum surface from one end to the other while turning
on and off the beam, one line of latent image is created. If the scanning by the laser beam is repeated while
rotating the drum, a two-dimensional image is created. The resolution in the scanning direction (from right to
left) is determined by the rotational speed of the printhead motor, depending on how quickly the laser is
adjusted. The resolution in the process direction (from top to bottom) is determined by the rotational speed of
the printhead motor. The higher the scanning speed becomes, the sooner the scanning of the next row can be
started.
Step 1: Charge
During the charge step, voltage is sent from the HVPS to the charge roll beside the photoconductor. The charge
roll applies a uniform negative charge over the entire surface of the photoconductor to prepare it for the laser
beam.
HVPS
(-VDC)
(-VDC)
Ground
Conductive Tube
Photoconductive
Surface
0V
-VDC value
DRUM
Drum Surface
Voltage
Drum Surface
Image
Ground
Charge roll
4514-6xx
Theory of operation
372
Summary of Contents for M3150
Page 12: ...Part name index 393 4514 6xx Table of contents 12 ...
Page 20: ...4514 6xx 20 ...
Page 38: ...4514 6xx 38 ...
Page 172: ...4514 6xx 172 ...
Page 246: ...3 Remove two screws A and then remove the cooling fan mount A 4514 6xx Parts removal 246 ...
Page 256: ...5 Remove the four screws B and then remove the right front mount B 4514 6xx Parts removal 256 ...
Page 260: ...b Set the spring over the plunger 4514 6xx Parts removal 260 ...
Page 277: ...3 Squeeze the latches B to release the left and right links B 4514 6xx Parts removal 277 ...
Page 300: ...3 Place the printer on its rear side 4 Release the sensor flag A 4514 6xx Parts removal 300 ...
Page 301: ...5 Remove the screw B 6 Remove the sensor flag bracket C 4514 6xx Parts removal 301 ...
Page 323: ...3 Swing the right cover backward to remove 4 Remove the screw D 4514 6xx Parts removal 323 ...
Page 333: ...4514 6xx 333 ...
Page 335: ...Assembly 1 Covers 4514 6xx Parts catalog 335 ...
Page 338: ...4514 6xx Parts catalog 338 ...
Page 339: ...Assembly 2 Electronics 1 1 2 3 4 5 7 9 10 11 6 8 12 4514 6xx Parts catalog 339 ...
Page 342: ...4514 6xx Parts catalog 342 ...
Page 343: ...Assembly 3 Electronics 2 4 3 2 1 5 6 8 9 7 4514 6xx Parts catalog 343 ...
Page 345: ...4514 6xx Parts catalog 345 ...
Page 346: ...Assembly 4 Frame 10 11 12 13 14 9 1 5 6 7 8 4 4 2 3 4514 6xx Parts catalog 346 ...
Page 349: ...Assembly 5 Option trays 3 4 5 6 1 2 4514 6xx Parts catalog 349 ...
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Page 386: ...4514 6xx Index 386 ...
Page 392: ...4514 6xx Part number index 392 ...
Page 398: ...4514 6xx Part name index 398 ...