Canon IR3300 uneven density line 2" from trail edge of page.

[Desert Rat]

I pulled out the drum, dev and fuser to look for worn gears and or binding.
The drum seemed to turn harder than usual. I had replaced the drum with
a precision roller after market drum. That happened last March.
I usually don't have a problem with
their drums and blades. May be a bad batch? I wish I had thought to
re-powder the drum and blade while I was there yesterday.
On test target number 5 from service the problem shows up, and there are
a number of other smaller lines too. The half tone print was not a nice smooth
gray. This is the second or third time I have rebuilt this drum unit. Usually
I will replace the whole thing when I see little wear lines on the primary
charge roller. The developer and fuser units turned smooth. Transfer roller
also turns easy.
This problem shows up real good on a Katen target, the side with all lines
close together. I'll try to post a sample or two.

Anyone have a clue?

DR

[Desert Rat]

Here's the update.
Went back with a used oem drum unit missing the pcr. Swap the pcr
out of the customers assy, installed it in the used oem drum unit
No change same line.

Went back with a new oem drum, a developer unit and a fuser assy
from the precision roller dent and scratch inventory.
The dev unit had just been returned and worked well, even had toner in
it.

The fuser I was told had a bad heater. So I did install the fuser before
changing the heater to verify it needed a heater. It gave the E0000-0000
code. Defined as:

E000
0000 The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.

Main cause The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The DC controller PCB is faulty.

So I put the heater from the customers machine in the fixing unit I brought. And put it in the machine and got one copy out. I was thinking
that may be the paper was being either jerked or stalled for a second.
Nope not the case. Put the heater back in the customers fuser
and E0000-0000 pops up. I reset it a couple of times but no good.

So I have some heaters at home and started checking them out.
I ohmed them out:
On the power end I was measuring about 45 ohms between the two
white wires and and open between the white and black leads. On the
end I got a high ohm reading from the small connector and the other
contacts on the heater. I assume these are the thermistors.
But I'm thinking I should have some reading between the white and
black wires on the power end.?
Also I can measure a burst of 120vac on the connector when the machine
powers up.

I don't think its the power supply, I hope it's the heater. Does anyone
know how these heaters are wired?

Thanks from down in the rabbit hole

[blackcat4866]

This probably won't help you much, but there for a while I was buying these rebuild kits ... here are the instructions that came with it. There aren't any meter readings on the heater. I know I have written up diagnostics on some of these film fusers, just not this one. =^..^=

[Desert Rat]

Blackcat,
You're right they did not help much, but I saved them anyway in the file for advice and tips.
I will have to get a new heater and ohm it out for a reference. Once I do I will post the
results. It may help someone else.
Actually I'm surprised it hasn't already been done.

Thanks for the reply

DR

[techwurk]

E000 that does not reset, then replace upper fixing unit. Density problem you may want to try exposure lamp and / or laser unit. Good luck

[techwurk]

One more suggestion about the density issue. Check the mag roller for debris behind the doctor blade and wear to the roller. Try swapping out the DV unit with another one even if it looks good

[Desert Rat]

techwurk,
I have already swapped the developer unit out with no change to the copy quality.
I thought about the laser, it could cause this and may be the lamp also. First I have to
get another heater for the fuser unit. I suspect an open between the black power line
and the two white neutral lines. I'm getting an open reading between them.

DR

[techwurk]

ok, did you replace the drum unit with OEM. These 3300 / 3320 can be fickle with AM drum rebuilds. It would be an outside chance that it is a laser or exp lamp but never the less. I have replaced many of the upper fixing assy on these, Canon has them as a replacement which is just the upper assy with the film and is the best route to correct the E000 that does not reset. Good luck, interested to see what the fix ends up being.