
Theory of Operation
2-11
Transfer Roller Assembly Control
Detecting the Installation of the Transfer Roller Assembly
Although there is no seperate sensor for this, the output of the CTD Sensor is used to
detect installation or absence of the Transfer Roller when power to the printer is
turned on, or the front cover is opened and closed.
Light emits from the LED of the CTD sensor with the specified intensity and if the
output of the CTD Sensor is greater than the specified value the controller signals that
the Transfer Roller is present (installed).
If printing is stopped by a jam, the toner image will be placed on the Transfer Roller.
In this case the sensor output result is low, causing the controller to report the Transfer
Roller as missing. To prevent this, the Transfer Roller is rotated a half turn if output is
lower than the specified value. If the output of the CTD sensor is than greater than the
specified value, the controller reports installation of the Transfer Roller. If the output
remains less than the specified value, the controller reports that the Transfer Roller is
not installed.
Detecting the Life of the Transfer Roller Assembly
The Transfer Roller Assembly consists of a bias transfer roller and a waste toner
recovery space. End of life of the Transfer Roller is detected when the waste toner
recovery space becomes full.
The full waste toner recovery space is detected by the Toner Full Sensor.
1.
Status of the waste toner recovery space is checked:
■
When the power is turned on.
■
When the front cover is opened and closed.
■
When paper exits the print engine.
2.
“Transfer Roller is at End of Life” error message is generated when the toner full
sensor detects the waste toner recovery space is full.
3.
“Replace Transfer Roller ” warning message is generated if the print count and
the toner dispense time are counted and the total count exceeds 15,000 prints.
4.
“Transfer Roller is at End of Life” error/ “Replace Transfer Roller ” warning
messages are reset if the toner full sensor does not detect a full waste toner
recovery space when power is turned on, or the front cover is opened and closed.
Summary of Contents for Phaser 6250DT
Page 1: ...Service Manual P h a s e r C o l o r L a s e r P r i n t e r 6250 ...
Page 2: ...manuals4you com manuals4you com ...
Page 39: ...1 16 Phaser 6250 Color Laser Printer Service Manual ...
Page 181: ...4 20 Phaser 6250 Color Laser Printer Service Manual ...
Page 207: ...5 26 Phaser 6250 Color Laser Printer Service Manual ...
Page 219: ...7 4 Phaser 6250 Color Laser Printer Service Manual ...
Page 342: ...Service Parts Disassembly 8 123 8 Repeat Steps 1 7 to remove the lower guide 6250 278 ...
Page 369: ...9 4 Phaser 6250 Color Laser Printer Service Manual Print Engine Parts PL 1 1 Covers 6250 286 ...
Page 373: ...9 8 Phaser 6250 Color Laser Printer Service Manual PL 3 1 Paper Feed I 6250 288 ...
Page 375: ...9 10 Phaser 6250 Color Laser Printer Service Manual PL 3 2 Paper Feed II 6250 289 ...
Page 377: ...9 12 Phaser 6250 Color Laser Printer Service Manual PL 3 3 Paper Feed III 6250 290 ...
Page 379: ...9 14 Phaser 6250 Color Laser Printer Service Manual PL 4 1 Housing Assembly Retard 6250 291 ...
Page 381: ...9 16 Phaser 6250 Color Laser Printer Service Manual PL 5 1 Chute Assembly In 6250 292 ...
Page 383: ...9 18 Phaser 6250 Color Laser Printer Service Manual PL 6 1 Chute Assembly Out 6250 293 ...
Page 386: ...Parts List 9 21 This Page Intentionally Left Blank ...
Page 387: ...9 22 Phaser 6250 Color Laser Printer Service Manual PL 7 1 Chute Assembly Exit 6250 294 ...
Page 391: ...9 26 Phaser 6250 Color Laser Printer Service Manual PL 9 1 Xerographics 6250 296 ...
Page 397: ...9 32 Phaser 6250 Color Laser Printer Service Manual PL 12 1 Electrical S6200 240 ...
Page 399: ...9 34 Phaser 6250 Color Laser Printer Service Manual PL 13 1 Harness Assemblies 6250 299 ...
Page 421: ...9 56 Phaser 6250 Color Laser Printer Service Manual ...
Page 428: ...10 7 Map 2 6250 307 ...
Page 429: ...10 8 Phaser 6250 Color Laser Printer Service Manual Map 3 6250 308 ...
Page 430: ...10 9 Map 4 6250 309 ...
Page 432: ...10 11 Map 5 6250 487 ...
Page 434: ...10 13 Map 6 6250 431 ...
Page 455: ...10 34 Phaser 6250 Color Laser Printer Service Manual ...
Page 456: ...A Appendix Appendix Contents Printer Status Codes ...
Page 466: ......
Page 467: ...071 0869 00 ...