Xerox 7300B - Phaser Color Laser Printer Service Manual page 118

Troubleshooting Procedure (cont'd.)
Step Check
7 Replace the Color Registration Sensor.
Did this fix the problem?
8 Replace the Engine Controller Board
EEPROM.
Did this fix the problem?
9 Scan Direction:
Use the Supplies Page to identify the problem
color.
Remove the Imaging Unit of the suspect color.
Inspect the grounding shaft. See "Imaging Unit
Cleaning" on page 8-225
Has the shaft shifted?
10 Visually inspect the Imaging Unit guides, on the
Printer Unit Chassis, for debris or damage.
Are the guides damaged or obstructed?
11 Check the Color Registration Sensor for dirt or
debris.
Be sure to check in and around the registration
shutter.
12 Verify the Color Registration Shutter opens and
closes by actuating the registration shutter
solenoid from service diagnostics.
Is the shutter and solenoid functioning
correctly?
13 Are the LED Head ribbon cables undamaged,
properly routed and seated?
14 Swap the LED Head of the problem color with
any other LED Head.
Print a Supplies Page.
Has the problem moved with the LED Head?
15 Replace the suspect LED Head assembly.
Did this correct the problem?
16 Replace the Color Registration Sensor.
Did this correct the problem?
17 Replace the Engine Controller Board
EEPROM.
Did this fix the problem?
3-102
Yes
Complete
Complete.
Replace the
Imaging Unit.
Clean the guides
on the Printer
Unit Chassis or
Replace the
damaged
assembly.
Clean the
sensor.
Go to step [13].
Go to step [14].
Replace the
defective LED
Head.
Complete
Complete
Complete
Phaser 7300 Color Printer Service Manual
No
Go to step [9].
Replace the
Engine
Controller
Board.
Go to step [10].
Go to step [11].
Go to step [12].
Replace the
solenoid and
wiring harness.
Reseat,
correctly route
or replace the
wiring harness.
Go to step [15].
Go to step [16].
Go to step [17].
Replace the
Engine
Controller
Board.