Xerox 7300B - Phaser Color Laser Printer Service Manual page 68

Install or Reseat [CMYK] Imaging Unit
Troubleshooting Procedure Table
Steps Actions and Questions
1 Is the Imaging Unit installed and seated
properly?
2 If the keys are not set properly on the
Imaging Units they may not seat properly.
Are the keys on the side of the Imaging
Units correctly set?
3 Visually inspect the Imaging Unit Contact
Assembly and springs.
Are the contacts free from damage and
debris?
4 Use service diagnostics to test the CMYK
IU Sensor.
Does the sensor function correctly?
5 Verify continuity between the IU Sensor
Board and the Engine Controller Board at
the JODEN connector.
Y pin 9 to pin 12
M pin 1 to pin 3
C pin 5 to pin 6
K pin 10 to pin 13
6 Check the wiring for defects and proper
connection.
Replace [CMYK] Imaging Unit
Troubleshooting Procedure Table
Steps Actions and Questions
1 Cycle power to the printer and ensure all
error messages are cleared.
Did the error reappear?
2 Use service diagnostics, or print a
Supplies Page, to verify if the Imaging
Unit is at or near end-of-life?
Note: If the Imaging Unit count is reset
using service diagnostics, the gas gauge
will not return to 100% because pixel
counts are not reset.
3 Install a new Imaging Unit and check to
see if the fuse blew after installation.
2-52
Yes
Go to step [2].
Go to step [3].
Go to step [4].
Replace the
Engine Controller
Board.
Replace the
Engine Controller
Board.
Replace the wiring
harness
Yes
Go to step [2].
Have the customer
replace the
Imaging Unit.
Replace the
EEPROM on the
Engine Controller
Board.
Phaser 7300 Color Printer Service Manual
No
Reseat the
Imaging Unit.
Reset the keys
properly.
Clean or replace
the Imaging Drum
Contact
Assembly.
Go to step [5].
Go to step [6].
Replace the Back
Plate Assembly.
No
Complete.
Go to step [3].
Replace the
Engine Controller
Board.