[CQ] NEED HELP ASAP!! Canon IR C7055 has Blacks fading and washing out

[jammnn]

I have a C7055 that keeps fading out on black density, I have replaced BLK Drum, Developer, Toner and performed adjustments like TD-AD-BLK then INIT-BLK. If I perform TD-AD-BLK then INIT-BLK 4 times I get my Black back, but it doesn't last long. Sometimes it will hold for 100 pages sometimes 1000. Would a dirt Patch Sensor cause this?

Also what is the proper value for P-LED-DA ? Mine is at 93

Any help is appreciated, Had a Canon tech help out but no luck, I am at a loss..


Thanks,