2-8
Phaser 6250 Color Laser Printer Service Manual
If toner density is too great (excess toner) and 16 dispense counts are required to
subtract this amount, the adjustment is accomplished by subtracting 2 counts from the
calculated PCDC count over each of the subsequent 8 prints. If the excess amount
cannot be subtracted in 8 print cycles, it is subtracted in the ninth and subsequent
prints.
High-Area Coverage Mode
Continuous printing of an image with density exceeding the toner dispense capability
causes the toner density in the developer to be lowered below the target toner density.
The high area coverage mode delays feeding of the next page, and dispenses toner
during this time so that the toner density time reaches the specified value during
continuous printing.
Admix Mode
If the high area coverage mode can not deal with the reduction of toner density in the
developer or if the machine is moved to an environment with a different humidity
level, the reference value for the toner density will change. This causes a large
discrepancy between the measured values from the CTD sensor and the referenced
value for the toner density.
Admix mode dispenses the toner immediately to prevent low-toner density. If the
patch density result measured by the CTD Sensor is lower than the reference value
from the toner density control, then the admix mode is initiated.
LED Light Density CTD (ADC) Control of Sensor
The CTD (ADC) sensor is a reflective sensor that emits light from an LED in the
sensor and detects the reflected light from the transfer roller. For exact density
measurement, the sensor output value (reflected light density) must be the specified
value when no toner is put on the Transfer Roller. The reflected light density varies
6250-067
Total dispense counts
Correction amount by ADC +16
Dispense counts by PCDC
Correction amount by ADC -8
Total dispense counts
2
3
1
2
0
0
1
2
3
2
Even allotment in first 8 prints
4
5
3
4
2
2
3
4
3
2
1
2
0
1
0
0
0
0
2
2
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 ...