c3004 sometimes random black dots in center and offset

[Mark Bbb]

Offset: 3,74" or 9,5 cm interval.
A pattern (width 0,18" or 0,5 cm) of black dots (at random places) exact in the center of the printout.
This band is formed in the direction of the paper movement (not transverse).
total counter: 429K
Only the ITB cl unit has been replaced.
I have looked in the S.M. for this 3,75" interval, can't find it.
Can you help us?
Thank you.

[davel]

Re: c3004 sometimes random black dots in center and offset

Replace the rest of the PM parts.

[FrohnB]

Re: c3004 sometimes random black dots in center and offset

Service manual says the Drums and Fusing sleeve are the same diameter - 94.2 mm - which is 9.42 cm or about 3.71".
I would start with those first - K Drum, and Fusing sleeve.

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

Service manual says the Drums and Fusing sleeve are the same diameter - 94.2 mm - which is 9.42 cm or about 3.71".
I would start with those first - K Drum, and Fusing sleeve.

Frohn, thank you!
May i ask you where to find these info in the s.m.?

[FrohnB]

Re: c3004 sometimes random black dots in center and offset

Frohn, thank you!
May i ask you where to find these info in the s.m.?

Under 'Troubleshooting' --> 'Image quality problems' --> 'When an abnormal image is created' - a page or two down from their gives a list of all the diameters for rollers and such.

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

Under 'Troubleshooting' --> 'Image quality problems' --> 'When an abnormal image is created' - a page or two down from their gives a list of all the diameters for rollers and such.

Thanks Frohn, found it.

Today i replaced the F.U. ass'y, and the band of dots in the middel of the printout was solved.
But not the offset, that would be very likely the pcu BK, which i will replace tomorrow (stock 0).
In my experience with the old models, i would have thought that the dots would be the pcu and the offset the F.U.
But no, no, no ... these are modern times.

[slimslob]

Re: c3004 sometimes random black dots in center and offset

Thanks Frohn, found it.

Today i replaced the F.U. ass'y, and the band of dots in the middel of the printout was solved.
But not the offset, that would be very likely the pcu BK, which i will replace tomorrow (stock 0).
In my experience with the old models, i would have thought that the dots would be the pcu and the offset the F.U.
But no, no, no ... these are modern times.

I have found over the years that offsetting can very frequently be the pdcu. If the developer is slightly over toned it can place more toner on the drum than the cleaning blade can remove in one pass. One thing that you can try is reducing the toner density in the developer and slightly increasing the transfer current. The attached document has the settings for older models but the specific SP numbers were changed with the Cxx03 models. Service Program (SP) Settings.pdf

[mga]

Re: c3004 sometimes random black dots in center and offset

Offset: 3,74" or 9,5 cm interval.
A pattern (width 0,18" or 0,5 cm) of black dots (at random places) exact in the center of the printout.
This band is formed in the direction of the paper movement (not transverse).
total counter: 429K
Only the ITB cl unit has been replaced.
I have looked in the S.M. for this 3,75" interval, can't find it.
Can you help us?
Thank you.

Samples would be good
Also if that machine has done 429k you probably find the pcu would of already been replaced was it a oem one

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

Samples would be good
Also if that machine has done 429k you probably find the pcu would of already been replaced was it a oem one

Correct, but .... you know

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

Replaced BK pcu this morning.
Few ours ago customer called: problem with the band of black dots in the center of the page, is back (not the offset).
Developer-box is my next best guess.
I which i could upload pictures, but for some reason i don't understand, i can't!
I'm afraid i need to contact "make a which foundation" for that.

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

Samples would be good
Also if that machine has done 429k you probably find the pcu would of already been replaced was it a oem one

I try (again) to upload a test chart page with the dots.KAC c3004 dots center.pdf

[Gary k]

Re: c3004 sometimes random black dots in center and offset

tech bulletin DAOC-034 there is a warp in the developer housing. Ricoh has a mylar to fix the issue Part# M0AJ3135

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

These dots in the center will only appear at multi print.
Replaced developerbox today.
Waiting to see if it is solved...

[Mark Bbb]

Re: c3004 sometimes random black dots in center and offset

tech bulletin DAOC-034 there is a warp in the developer housing. Ricoh has a mylar to fix the issue Part# M0AJ3135

Jep, that was the issue. Thank you for sharing.

[mga]

Re: c3004 sometimes random black dots in center and offset

tech bulletin DAOC-034 there is a warp in the developer housing. Ricoh has a mylar to fix the issue Part# M0AJ3135

I think it's RTB rd239095 and part number M0AJ3138