Xerox 7750DXF - Phaser Color Laser Printer Service Manual page 173

Light or Undertone Prints in All Colors
The overall image density is too light in
all colors.
1.
Verify the transfer roller has not
reached its end-of-life.
2. Calibrate for Paper
Run the
routine.
3. Check the accumulator belt
assembly for mis-alignment
4.
Replace the transfer roller.
5.
Replace the high-voltage power
supply.
Print-Quality Troubleshooting 5-13