Adjusting The Transfer Roller Bias - Xerox Phaser 6600 Service Manual

Adjusting the Transfer Roller Bias

The bias voltage applied to the Transfer Roller (BTR2) controls how the toner transfers from the
Transfer Belt to the paper. If the bias voltage is too low, the toner does not transfer properly, producing
light colors and white spots. If the bias voltage is too high, mottling of the image can occur.
Adjusting the Transfer Roller bias requires entering Service Mode and editing NVM using a specific
Chain-Link code. Refer to "NVM Read and Write (Edit NVM)" on page 2-28 for detailed instructions on
editing NVM values. Refer to the table below for the Chain-Link codes associated with 11 different
paper types.
To adjust the Transfer Roller bias:
1. Identify the paper type that is producing symptoms of mis-adjusted bias.
2. Enter Service Mode and navigate to Printer Diag > Engine Diag > NVM Settings > Edit NVM.
3. Enter the Chain-Link code for the paper identified in step 1. Refer to the table for the appropriate
Chain-Link code.
Parameter Paper Type
Plain Paper-L Hole-Punched
or
Colored
Plain Paper-H Plain
Recycled Recycled
Heavier Paper-L Special or
Heavyweight
Cardstock
Heavier Paper-H Special or
Heavyweight
Cardstock
Coated Paper-M Lightweight
Glossy
Cardstock
Coated Paper-H Heavyweight
Glossy
Cardstock
Envelope Envelope
Label-H Labels
CAUTION: In the following step, do not use values higher than 16.
4. Adjust the value up or down as necessary to a value with the range 1-16. The default setting is 6.
Xerox Internal Use Only
Range Initial
1~16 6
1~16 6
1~16 6
1~16 6
1~16 6
1~16 6
1~16 6
1~16 6
1~16 6
Chain Link
746-500
746-501
746-503
746-504
746-505
746-512
746-513
746-509
746-507
Phaser 6600 and WorkCentre 6605
Maintenance
6-21
Service Manual