When was the last time the developer was replaced in the developer unit? If has been replaced then you might have a bad ATDC (Automatic Toner Density Control) sensor Located right below the developer unit (Same unit houses the drum. If the developer was replaced when it was done was a vacuum cleaner used? IF so the static electricity from the vacuum clear could have destroyed the sensor, NEVER USE a VACUUM cleaner to remove the developer. Also when the developer was replaced, was the counter cleared to tell the copier developer was replaced, the copier uses certain counters to determine certain voltages for certain assemblies, if not image problems and codes can appear. Finally was the F8 run after the developer was installed before any prints or copies were made? If not buy new developer and start over, counter is to be cleared first, then developer replaced, then F8 (TCR ADJ) run.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
I recommend that you will post your question under the correct category (Printers) it will be easier for Experts to understand the question and answer it.
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