AR -M450 copy quality problem, pls help!

[pcernicky]

Hi everyone,

The copy quality was getting bad, so I performed 50k and 100k maintenance, replaced drum, clean optics, and I'm still getting grey sky shot and not solid black, I changed the transfer roller but no luck, It seems that there is a lot of toner left on the drum after the paper pass thru.

The DV = 80 read out

I swapped the DV units but the quality was still poor.

Please help.

Thank you.

[bilyahn]

Check the registration unit, take it apart and clean. Have had similar CQ problems caused by poor earth ground. I think there is a tech bulletin regarding this.

Good luck.

Bil

[pcernicky]

Which registration unit do you mean bill? Do you have that tech bulletin?

[blackcat4866]

Did either of the developing units you installed have fresh developer? Developer is a PM part, and the next place to start. =^..^=

[pcernicky]

I tested the dv unit from the copier that i know has a good copy quality and the dv had about 33k on it. still he same outcome. grey not black.

[blackcat4866]

Have you ran any self prints 64-01 pattern 83? If so, please attach.

[pcernicky]

No I haven't ,I'll do tomorrow.

[bilyahn]

Which registration unit do you mean bill? Do you have that tech bulletin?

Just below the drum, Sharp now calls it the PS assembly. There are 2 screws at the front of the machine then the unit pulls right out with a connector for one sensor. When you pull it out look at the rear of the machine below the developer unit. I have found a lot of developer spill into this area. I then take apart and clean the unit. Watch out for the small spring when you take the back plate off. Sorry I can't seem to find the TB I am thinking of.

[pcernicky]

Thx bilyahn, I'll try that tomorrow. is it on the bottom where the DV unit slides out?

[blackcat4866]

No, the registration assy comes out with two or for screws from the left door, and one connector at the rear frame. =^..^=

[bilyahn]

Thx bilyahn, I'll try that tomorrow. is it on the bottom where the DV unit slides out?

Sorry, I should of mentioned you access it from the left side after you open the sliding door. It's the large black roller just below the drum unit.

[mtech]

Is the toner at 20% or less? Replace the toner and redo all your adjustments then run off a couple hundred copies.

[pcernicky]

Is the toner at 20% or less? Replace the toner and redo all your adjustments then run off a couple hundred copies.

I put fresh toner in and run about 250 copies, same issue, still grey, when I do sky shot i'm getting lighter pattern almost like a mag roller from dv unit every couple of inches. is it ok for dv to be at 80 shouldn't it be around 125?

[spotlifter]

Check the drum earth plate. Maybe not touching the drum shaft. As for dv, check the connections inside the copier. Toners do spills some around there. I do sometimes get dv value that is incorrect. After trying inserting the dv unit a couple of times, I checked the value has changed. It is probably the connection sticking some toners. You might try also cleaning the TD sensors.

[pcernicky]

Thank you all. I cleaned all connections and the drum plate. Still the same problem. I ran a copy and the image on the drum is perfectly black, so the dv and drum are fine but it seems like there is somethong not right with transfer roller. I took it apart, cleaned adjust the pressure springs and still the same issue. I just ordered a new tranfer roller and im replacing it tomorrow. Any suggestions why is this happening, the copier has 30k on the transfer roller.

Thank you all.