Xerox Phaser 6128MFP - Check Unit CTD Sensor Error

Phaser 6128MFP Service Manual 3-111
Error Messages and Codes
Check Unit CTD Sensor Error
The ADC Sensor has detected a density error for the indicated color. This
troubleshooting procedure applies to this error.
Applicable Error
•Check Unit CTD Sensor
Initial Actions
• Clean the Transfer Belt and ADC Sensor window using a dry cloth.
• Check the Transfer Belt life counter. If near end of life, replace the part.
• Cycle printer power.
• If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ Transfer Belt, PL6.1.7
■ Left Side Harness, PL10.4.18
■ MCU Board, PL10.7.7
■ “Map 1 - MCU Board” on page 10-6
■ “Map 4 - Imaging” on page 10-9
■ “Xerographics” on page 10-18
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Check the Transfer Belt installation.
Is the Transfer Belt correctly
installed?
Go to step 3. Reseat the
Transfer Belt.
Go to step 2.
2 Does the error still occur when the
printer is turned On?
Go to step 3. Complete.
3 Check connectors P/J28 and P/J281
between the MCU Board and
Transfer Belt.
Are the connectors secure?
Go to step 4 Reconnect the
connectors.
4 Check Left Side Harness continuity.
Disconnect P/J28 from the MCU
Board and P/J281 to the Transfer
Belt.
Is the harness damaged?
Repair or
replace the
harness
(PL10.4.18).
Go to step 4.
5 Replace the Transfer Belt
(page 8-103).
Does the error persist?
Replace the
MCU Board
(page 8-57).
Complete.