Savin 2535 Weird Problem, Need advice from more experienced techs

[sherman]

Hello,

Having a problem with a Savin 2535 and just want a little advice before I troubleshoot.

Machine was copying fine from last drum change. Occasionally throwing 990's. Drum was overdue so replaced along with blade. Did not replace charge roller just cleaned with soap and water and used vac to blow out drum unit outside of machine. Also cleaned transfer unit. Did necessary settings in SP mode. Tested machine copies ok.

Used the machine for 1 day. Average 1200 copies. Turned off.

Next morning first copy comes out with a lot of thin and thick lines and words are stretched across page. Second copy has less lines and words are less stretched. Third still has a few lines and slight stretching. Fourth copy is fine. Every copy after for the rest of the day is perfect. Machine is turned off for about 1 hour and back on. Copies still fine. Machine turned off for the night.

Next morning same thing. First copy a lot of thin and thick lines and stretched words. Eventually gets better and works for the rest of the day till next morning and then same thing.

Checked SC history for the few mornings and found (326, 951, 984, 402)

Not sure where to look. LD unit? If so then why after drum change?

[TonerMunkeh]

The Adonis does this, they're a really random machine. You can come to one that's behaving fine, say it just needs a hot roller or something. You service it, put it back together and it starts giving you SC codes.

Before replacing any parts, run LD unit pitch adjustment from the service manual. I've had them do this before and it's sorted them out. I think someone else here has mentioned something about lifting or bending something under the laser unit up?

Oh, and before I forget - replace the charge roller and cleaning brush. ALWAYS replace these items as a set.

[rthonpm]

Check and make sure the drum isn't shifting around in place. I've seen a bad drum gear give this issue as the drum flops around, but also with the PCU assembly itself not being seated right.
Also, try using the cleaner brush for the 2035 (G7902329) instead of the velour one for the 1035. It does a better job cleaning the charge roller off as it's a more robust surface.
If everything there looks good, try reloading the firmware, laser adjustment and then finally an engine NVRAM clear if you still have the birth certificate with the machine.

[Jomama46]

I think it is a mechanical problem. The drum is not moving at the correct speed and therefore i stretching the image. Maybe the drum bearing (attached to the drum) or the way it is seated in the cleaner unit. After its run awhile it loosens up.
On second thought, that would squeeze the image.

[dckm]

Lube or replace the drum blade. Also, you might be getting some condensation in the drum unit over night. The blade digs into the drum, until the toner relubes it.

[cobiray]

Make sure the flywheel screw is tightened down the whole way.

[sherman]

Thanks guys. Appreciate the time taken to reply. I will try your suggestions out and let you know what happens.

[bonnie750]

If the problem is due to the drum not rotating at the correct speed continuously could it be the drive gear? I seem to remember something about the drum drive gear cracking/coming loose????

Worth a look at

[Canadian Tech]

I'd lay odds, it's the drum drive gear behind the flywheel is cracked.
Remove flywheel and gear is behind flywheel, secured to the shaft with a hex set screw.

[gary]

print out the smc and check LD power. don't follow the defualt.

go to LD power adjustment set it to 0-70. but u must service the LD unit frist.

LD bitch adjustment also need to do. 400dpi 600dpi

[sherman]

Jomama46 seems to have been on the right track.

After trying all suggestions I was still having the problem after leaving the machine off a few hours. When I do around 5 copies the lines and stretching of the image (vertically) go away. I also swapped drum unit and laser unit and they worked fine in another machine. I have been using the machine a few days with this problem then all of a sudden I started getting all black copies with no image. I did test prints from sc menu and still had black copies. I checked the drum shaft to ground and their was none. Replaced the drum shaft bearing and copies are normal. It seems the bearing was failing and after a few copies their was continuity but why would this cause image to stretch? Made me think it was laser unit or a board.

I will know for sure in a few hours if the initial problem reoccurs.

Thank you again for the responses

[sherman]

Tryed machine this morning and is working fine. Drum ground cleared the fault. However after a few 100 copies started getting a second image to the right of the orginal image and getting a sc326 after every copy.

I will remove laser unit and clean.

I understand how to do the laser pitch beam adjustment according to the service manual but I do not see any reference to the "Birth Certificate" that you guys are mentioning. Where do I get this number from? and what do I do if I do not have one with my machine?

[gary]

try to replace BICU board and see how.

[trc]

ooops!!!!

Replace poligon mirror motor