Iq-11 Sled Transfer Failure - Xerox Phaser 7500 Service Manual

IQ-11 SLED Transfer Failure

Phaser 7500 Printer Service Manual
Stripes and blank areas (stripes) in an individual color appear repeatedly in sizes of
2.7 mm. They appear by half chip units.
Cause
• + 5 vdc failure. LED Chip failure.
Initial Actions
• Check the paper transfer path.
• Ensure there are no debris on the transfer path.
Troubleshooting Reference
Applicable Parts
LED Print Head, PL2.1.2
■
LVPS, PL18.1.7
■
Motor Drive PWB, PL18.3.7
■
Troubleshooting Procedure
Step Actions and Questions
1 Check the power source.
Is 5V output from the Motor Drive
PWB?
Pin 518 A4 for Yellow
■
Pin 518 A8 for Magenta
■
Pin 518 B5 for Cyan
■
Pin 518 B1 for Black
■
2 Check the continuity of the cable
between the Motor Drive MCU and
LED Print Head of the effected color.
Is the continuity between the Motor
Drive PWB and the LED Print Head
normal?
Print-Quality Troubleshooting
Example Print
Yes
Go to step 2.
Replace the
LED Print Head
(REP 2.1,
page 8-18).
SLED Transfer Failure
No
Go to step 3.
Replace the
cable.
5-37