Bizhub920: drum beating, background

[ondemandprint]

Hello.
There are toner tracks with circumference of drum (leftward on the picture, operator's edge at the machine) at the same places mostly. Also there is some background. The page is A3. Please, do not see at band in the middle - it's scan defect.

Drum is new, cleaning blades are new. Machine counter is about 7 000 000.

[Synthohol]

Re: Bizhub920: drum beating, background

i know its silly to ask but all the counters were reset for all the parts replaced and you performed the following and it still happens?

Drum PeculiarityAdjustment	Blade Setting Mode	e
Auto Drum Potential Adjustment	f	e
Auto Maximum Density Adjustment	g	f
Auto Laser Diameter Adjustment	h	g
LD Offset Adjustment	i	h
Auto Gamma Adjustment (1dot)	j	i

[Markks]

Re: Bizhub920: drum beating, background

Maybe the spacer collars on the developer unit try putting 1 or 2 wraps on them

[ondemandprint]

Re: Bizhub920: drum beating, background

Maybe the spacer collars on the developer unit try putting 1 or 2 wraps on them

Where are they? Do you mean developing unit stopper rollers and stopper plates interactions?

[ondemandprint]

Re: Bizhub920: drum beating, background

i know its silly to ask

It's not silly at all, thank you. I reset and performed installation procedure with adjustments.
Beating is the main trouble as I think. Something wrong in Cleaning Unit - Drum - Developing Unit positions maybe.

[Markks]

Re: Bizhub920: drum beating, background

Where are they? Do you mean developing unit stopper rollers and stopper plates interactions?

They are the collars that set the gap between the drum and developer roller. I'll take picture of the parts manual tomorrow and attach

[Markks]

Re: Bizhub920: drum beating, background

They are the collars that set the gap between the drum and developer roller. I'll take picture of the parts manual tomorrow and attach

Sorry its taken me so long to get back, yes the parts manual does call the rollers DEVELOPING STOPPER ROLLER item numbers 19 & 20 in picture attached.

[ondemandprint]

Re: Bizhub920: drum beating, background

Putting 1 or 2 wraps on the stopper rollers solved beating trouble.

Additional question about stopper plates which interacts with DEVELOPING STOPPER ROLLER. Are they tightened or loosened?
On my machine both are loosened and swings a bit on their places .

[Markks]

Re: Bizhub920: drum beating, background

Putting 1 or 2 wraps on the stopper rollers solved beating trouble.

Additional question about stopper plates which interacts with DEVELOPING STOPPER ROLLER. Are they tightened or loosened?
On my machine both are loosened and swings a bit on their places .

Its been so long since I worked on one of those I dont remember exactly but I don't think they should be to loose

[ondemandprint]

Re: Bizhub920: drum beating, background

For now there is only background on the second side of duplex printing. As I think it's because of page goes via fuser unit. Bad transfer on hot dried paper? External humidity is 35-50%.


Simplex printing has no background at all at any stacking (face-up or face-down).

[allan]

Re: Bizhub920: drum beating, background

Make sure your discharge corona wire and erase lamp is working and in good condition.
Could still be a drum spacing issue.