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Phaser 6200 Color Laser Printer - Service Manual
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 retards the next page fed 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 used in a high-humidity environment and is relocated
to a low-humidity environment, 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 generated.
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
depending on the Transfer Roller surface condition or dirty condition of CTD (ADC)
sensor surface. The light density emitted from the LED is controlled so that the
reflected light density meets the specified value.
This control is implemented in two ways:
1. Sets the light density so that the light reflected satisfies a specific value.
2. Adjusts the subsequent light density to be within a specific tolerance value.
1.
Light Density Setting
The reflected light density can vary greatly if the transfer roller has been
replaced or the CTD (ADC) sensor has been cleaned. To deal with this
variance the light density is reset when the power is turned on or the front
cover is opened and closed.
The intensity of the LED increases gradually and the set value is adjusted
when the output of the CTD (ADC) sensor exceeds the specified value. If
the output of the CTD (ADC) sensor does not reach the specified value,
even though the light density is increased to the maximum limit, the
controller signals the sensor is dirty. The controller will also signal the
sensor as faulty in the event of extremely high output.
Summary of Contents for Phaser 6200
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Page 141: ...FRU Disassembly Removal and Replacement Procedures 123 Orientation of the Printer S6200 063 ...
Page 146: ...128 Phaser 6200 Color Laser Printer Service Manual RRP 1 3 Fuser Fan PL 1 1 7 S6200 066 1 2 1 ...
Page 171: ...FRU Disassembly Removal and Replacement Procedures 153 Blank Page ...
Page 274: ...256 Phaser 6200 Color Laser Printer Service Manual PL 1 1 Covers S6200 228 ...
Page 280: ...262 Phaser 6200 Color Laser Printer Service Manual PL 3 2 Paper Feed II S6200 231 ...
Page 282: ...264 Phaser 6200 Color Laser Printer Service Manual PL 3 3 Paper Feed III S6200 247 ...
Page 284: ...266 Phaser 6200 Color Laser Printer Service Manual PL 4 1 Housing Assembly Retard S6200 232 ...
Page 286: ...268 Phaser 6200 Color Laser Printer Service Manual PL 5 1 Chute Assembly In S6200 233 ...
Page 290: ...272 Phaser 6200 Color Laser Printer Service Manual PL 7 1 Chute Assembly Exit S6200 235 ...
Page 294: ...276 Phaser 6200 Color Laser Printer Service Manual PL 9 1 Xerographics S6200 237 ...
Page 300: ...282 Phaser 6200 Color Laser Printer Service Manual PL 12 1 Electrical S6200 240 ...
Page 302: ...284 Phaser 6200 Color Laser Printer Service Manual PL 13 1 Harness Assemblies S6200 241 ...
Page 318: ...300 Phaser 6200 Color Laser Printer Service Manual Blank Page ...
Page 363: ...Plug Jack Locator Maps 345 Map 1 S6200 264 ...
Page 364: ...346 Phaser 6200 Color Laser Printer Service Manual Map 2 S6200 265 ...
Page 365: ...Plug Jack Locator Maps 347 Map 3 S6200 266 ...
Page 366: ...348 Phaser 6200 Color Laser Printer Service Manual Map 4 S6200 267 ...
Page 368: ...350 Phaser 6200 Color Laser Printer Service Manual Map 5 S6200 268 ...
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