Xerox Phaser 7300B, Service Manual

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4-116 Phaser 7300 Color Printer Service Manual
Automatic Density Control (ADC)
Calibration Procedure
To insure optimal print quality, each color image must be predictable and repeatable.
Therefore, the print engine must know how much toner to use to create the proper
color density. The ADC sensor is built into the middle of the color registration sensor
assembly. For more information on the ADC Sensor, see the section "Theory of
Operation" on page 8-219.
The print engine will perform a density adjustment when:
■
A new Imaging Unit is installed
■
A new Toner Cartridge is installed
■
At 100, 300 and 500 Imaging Unit images, then every 500 images
■
At power-on
Service technicians must initiate an ADC calibration upon replacement of the
following parts:
■
Color Registration Sensor
■
Color Registration Shutter (contains Color Chip)
■
Print Engine EEPROM
■
Print Engine Controller Board
Caution: Clean the color chip with API to remove any oil that may
have been left by your fingers from handling the color
chip. It is critical the color chip is clean.
1. Entering the New Tag Number:
The color chip has a reference value (tag number) that adjusts the ADC sensor
to the color chip. The last two digits of the tag number must be input using
service diagnostics. The tag number is located on the bottom of the registration
shutter next to the color chip.
a. Scroll to
Adjustments/Calibrations
, then press OK .
b.
Scroll to
Auto Density Control
, then press OK .
c.
Select
Edit Density Data
and press OK . After a short delay, the
display will indicate the
Current Tag Number
and ask if you want
to
Change Tag Number
.
d. Select Yes and press OK .
e.
When the display prompts to
Enter Tag Number
, use the Up/Down
keys to enter the tag number on the Registration Shutter Color Chip.
When the new number is entered, press OK .
f. After a short delay, the display will indicate the new
Tag Number
.
Press the Back key to return to the
Automatic Density Control
menu.