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M750 no yellow
A buddy of mine is troubleshooting an Enterprise M750. Starts printing good. After a few pages the yellow drops and all yellow printing is now white in appearance.
Here are the parts that have been replaced so far:
- Toner drive motor
- Formatter board
- ITB
- Scanner Assm
- DC controller
When cartrtidge disable test is run, the cartridge in the yellow slot starts out good and then "white".
There are no error codes or messages.
Firmware is up to date.
I'm leaning towards one of the HVPS - primary or imaging.
Any thoughts??
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