Repair information 4-21
5025-2xx, 4xx
Warning: When replacing the controller board, verify the cable from the high-voltage power supply is seated
properly. The cable may have come loose from the HVPS.
Print a few pages to verify the installation. If the pages are blank, confirm that the high-voltage
power supply cable is properly seated. The connector may have been loosened at the HVPS.
A blank page that should have toner on it could be an indication that toner is applied to the ITU belt
but not transferred. Therefore the toner goes into the ITU cleaner which cannot process massive
amounts of toner. It is important to prevent extensive blank pages from being processed if they
should have toner on them.
Developer unit removal
The developer units are not FRUs.
1. Open the toner access door.
2. Remove the toner cartridges.
3. Remove the imaging unit. See “Imaging unit (IU) removal”.
Warning: Do not touch the underside of the imaging unit. This could damage it.
4. Remove the developer unit(s).
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