c250 Just try to fix me

[pepper38_cnd]

What is the code you get?

[xpress]

Still the 3451, the thermister temps dont match, but the fuser works fine in the machnie next to it. On the broken one in tech rep, I can watch the temp stay at 0degrees C. Getting random motor codes. The fuser error is not comming up imiditly now. It will stablise the image for 30 sec before I get it.

[dcopylady]

Hope it helps

There are two interlock switches on the right side door. 1 tells copier the door is closed (rear), and other is a safety, tells copier is ok to turn on the fuser (front). If the copier door is closed but the safety is open, it will pre-run but then throw a fuser warm up code. Check the following:
Duplex mounting screws are tight.
Look for damaged door latch hooks.
Is the door actually warped?
Manually 'fool' both interlocks with the door open and see if your fuser warms.
If not, check safety switch with multimeter.
Check that the FRONT door interlock latches securley.
Check the wire harness for damage where it goes through the frame right behind tthe fuser.
Check bypass feed table harness, that the wires are not smashed in the pivot point.
Also check optics and as many other frame bottoms for rodent droppings!

[pepper38_cnd]

I agree with dcopylady. I still think it is S2 it's in the front on the right side and if I'm not mistaken it is the same interlock switch that plagued the 7040 even tho the part number is different. What I would do is pull the wires off the switch and jumper them together and see if you get heat. This switch is a push switch and does not click, checking it with a meter is not always a good test as the contacts become high resistance under load due to carbon build up.

[Having a ball]

How are you performing the trouble reset for this machine? if the code is continually ocuring it may be the fuser unit this is common on these machines, I would also check the firmware version should be KO and change dsw 50 the other codes could be the fact of removing the boards and refitting them incorrectly and may not be the intial problem but a prob caused by the repair attempt.

[ni311]

Did you try to measure the voltage on the fuser connectors? Is there any?

[DadO]

I think the machine is shouting for replacement. At the end, repair will be something barely noticeable and u will waste more weeks till that.

Do ur self a favor ....

[tech51]

Don`t know if this will help but may be worth going through just in case.

Description

C3451 (C-3451) or C3452 (C-3452).

Solution

CAUSE: Heater Not Warming Up. The voltage of the Fusing Pressure Roller Thermistor does not increase by five steps within 20 seconds after the pre-drive
of the Fusing Roller has been started during warm-up cycle.
SOLUTION: There are a few things that may cause the problem:
1. Check that the Fusing Unit is correctly installed.
2. Reseat connections on the Fusing Unit, PWB-MFPB and DCPU.
3. Change Fusing Unit (p/n 9J06 R705 00; p/n4038075400 for the bizhub C250).
4. Change bizhub C300 PWB-MFPB - Control Board (p/n 9J06-H003-01);bizhub C352 PWB-MFPB - Control Board (p/n 9J06-0101-02); bizhub C250
PWB-MFP (p/n4038012106).

5. If the problem persists, replace Power Supply - DCPU (p/n 9J06 6201 01; p/n4038 6201 02 for the bizhub C250).

[xpress]

The strange has only gotten stranger:

So we replaced the machine's main motor with one from another functioning machine...since then we have got a full start and warm up, which we never had before, and it even runs a copy, but no ink comes out on the copy.

That happened last week.

And now, I tried to start it this morning and got 2 of the C3451 messages (even though I could see the fuser warming up), then after 2 trouble resets, it warmed up fully and ran another blank copy from our test sheet.

It's so freaking bizarre. Any ideas?


Thanks

[Cantechman]

I have seen that error on the same model 2 different times on the same machine. I ended up rewriting the firmware and it was fine. Was ok for about 9 months then started again, so once again I rewrote firmware. So far so good.

[dudley]

C250 uses a weird temp program and there was a bulletin for fuser codes on bad power. Had a lot of trouble with them. If you go to software switch settings and change sw50 bit1(right most bit) to a 1, it will go back to conventional monitoring of the fuser temp. Fixed up alot of our machines. This works on C250, C252, C352 and maybe a couple of others.

Didn't see in your posts but have you swapped the power supply? the relays and triacs are on that board, maybe a bad relay for the lamps.