MP171 background

[Ltd]

I cleaned Transfer roller, copies made clean. but if it run for about 50 pages I got background again, new PCU did not solved problem, It only had 13K on meter.

[Gesttech]

HI Ltd

Is your Transfer Roller a new one, if not replace it.
Your machine has over toner, too many toner in developer & voltage too high for copying.
Solution: Replace Toner, Pcu, Transfer roller.
If problem persist replace the High Voltage Power Supply Board & Nvram.

[Eric1968]

HI Ltd

Is your Transfer Roller a new one, if not replace it.
Your machine has over toner, too many toner in developer & voltage too high for copying.
Solution: Replace Toner, Pcu, Transfer roller.
If problem persist replace the High Voltage Power Supply Board & Nvram.

NVRAM???

[teebee1234]

Are the discharge lamps coming on?