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Phaser 6250 Color Laser Printer Service Manual
Selective Control; Paper Pick
Unless changed in printer setup, the default tray is Tray 2. Trays in the optional High-
Capacity Feeder are identified as Tray 3 and Tray 4. The tray in the optional 500-sheet
Feeder is identified as Tray 3.
Laser Light Intensity Control
The Laser Unit in the Phaser 6250 printer has four laser diodes: one each for yellow,
magenta, cyan, and black. The diodes control circuits adjust the light intensity for
each color automatically. Image data is transmitted to the laser diodes in the Laser
Unit as digital signals. The laser diodes convert the image data from digital signals to
optical signals. The laser assembly monitors and adjusts the light intensity of the laser
beams to attain a stable electrostatic image. Variations in drum sensitivity may
prevent the system from obtaining a proper electrostatic image.
Process Control
For stable printing, the parameters related to forming both the electrostatic and toner
image must be continuously monitored and adjusted by the printer. Parameter
correction and control over the entire printing process is called “process control”.
There are two main areas of control:
■
Bias Control
■
Toner Density Control
To supplement these two controls, the following are provided:
■
High-Area Coverage Mode Control
■
Admix Mode Control
■
Toner Density Control (CTD) Sensor (ADC - Automatic Density Control)
LED light density setting.
Bias Control
To attain stable image density, toner density is monitored for each color and the drum
charging voltage and biasing DC voltages are adjusted according to the monitored
results for each color.
The bias control adjustment is made immediately before the start of printing, if any of
the following conditions is satisfied:
■
First print produced after the power on.
■
Cumulative print count exceeds 16 since power on.
■
A cleaning cycle is executed during continuous printing.
Summary of Contents for PHASER 6250
Page 1: ...Service Manual Phaser 6250 701P46430 Color Laser Printer ...
Page 2: ......
Page 40: ...1 16 Phaser 6250 Color Laser Printer Service Manual ...
Page 168: ...3 86 Phaser 6250 Color Laser Printer Service Manual ...
Page 214: ...5 26 Phaser 6250 Color Laser Printer Service Manual ...
Page 226: ...7 4 Phaser 6250 Color Laser Printer Service Manual ...
Page 349: ...Service Parts Disassembly 8 123 8 Repeat Steps 1 7 to remove the lower guide 6250 278 ...
Page 376: ...9 4 Phaser 6250 Color Laser Printer Service Manual Print Engine Parts PL 1 1 Covers 6250 286 ...
Page 380: ...9 8 Phaser 6250 Color Laser Printer Service Manual PL 3 1 Paper Feed I 6250 288 ...
Page 382: ...9 10 Phaser 6250 Color Laser Printer Service Manual PL 3 2 Paper Feed II 6250 289 ...
Page 384: ...9 12 Phaser 6250 Color Laser Printer Service Manual PL 3 3 Paper Feed III 6250 290 ...
Page 386: ...9 14 Phaser 6250 Color Laser Printer Service Manual PL 4 1 Housing Assembly Retard 6250 291 ...
Page 388: ...9 16 Phaser 6250 Color Laser Printer Service Manual PL 5 1 Chute Assembly In 6250 292 ...
Page 390: ...9 18 Phaser 6250 Color Laser Printer Service Manual PL 6 1 Chute Assembly Out 6250 293 ...
Page 393: ...Parts List 9 21 This Page Intentionally Left Blank ...
Page 394: ...9 22 Phaser 6250 Color Laser Printer Service Manual PL 7 1 Chute Assembly Exit 6250 294 ...
Page 398: ...9 26 Phaser 6250 Color Laser Printer Service Manual PL 9 1 Xerographics 6250 296 ...
Page 404: ...9 32 Phaser 6250 Color Laser Printer Service Manual PL 12 1 Electrical S6200 240 ...
Page 406: ...9 34 Phaser 6250 Color Laser Printer Service Manual PL 13 1 Harness Assemblies 6250 299 ...
Page 428: ...9 56 Phaser 6250 Color Laser Printer Service Manual ...
Page 435: ...10 7 Map 2 6250 307 ...
Page 436: ...10 8 Phaser 6250 Color Laser Printer Service Manual Map 3 6250 308 ...
Page 437: ...10 9 Map 4 6250 309 ...
Page 439: ...10 11 Map 5 6250 487 ...
Page 441: ...10 13 Map 6 6250 431 ...
Page 462: ...10 34 Phaser 6250 Color Laser Printer Service Manual ...
Page 463: ...A Appendix Reference Contents Printer Status Codes ...
Page 473: ......
Page 474: ...701P46430 ...