MP C2551 SC 400

[Lagonda]

Gentlemen, it's time to admit defeat

I have a MP C2551 that doesn't draw the MUSIC patterns on the ITB so the ID sensors can't read them and the copier shuts down with SC 400. There is plenty of toner in all the drum units and when you can coax a copy out of it the image is quite dense. If you remove the ITB cleaning unit you can see the remains of the image it's just printed go past but not a sign of the MUSIC bars.

So far I've changed the controller, BCU, IPU and SBU. I've even changed the EEPROM and NVRAM but still nothing. I've even done a full memory reset with SP 5801 and it still won't develop MUSIC bars.

How ever print out a test pattern with SP 2-109 and there is no problem there. Anybody got any idea of where in the system the MUSIC bars are generated?

Can somebody point me in the right direction before I lose all face with the junior techs?

[copier tech]

Re: MP C2551 SC 400

Have you changed the density sensor PCB? each time I have had this issue it was a failed ID sensor(s)

Also look at how this ass'y racks in & out, there is a cam that can break or the motor can fail.

Also update the firmware then you have covered all bases!

[Polarbear]

Re: MP C2551 SC 400

Hi

Remove the ITB and check if there is any printed lines on it - that is a good start.

Make sure that the ID sensors are clean. Also remove the plate that sits on the itb just above the id sensors, and clean the toner build up there.

Check the fusing air filter at the rear of the machine (top left if seen from behind the machine).

If none of the above helps, replace the id sensor array - making sure you follow the installation routine and enter the values supplied.

Hope you have a birth certificate of the machine - seeing that you did a memory all clear, there are heaps of settings that need to me re-entered.

[Lagonda]

Re: MP C2551 SC 400

Gentlemen,
Thank you for your fast replies but I should have been a little more explicit in my first post. Yes, the ID sensor has been replaced, that was the first thing the field techs tried.
The problem is the MUSIC bars are not being drawn on the ITB for the sensors to look at.
Yes, the ITB has been taken out and inspected and there is not a trace of the bars anywhere.

And sorry to say that this is one of the older copiers in our fleet and the birth certificate disappeared long ago. However I do have the full SMC report so I'll just have to go through it line by line and re-enter it all.
Better still, I'll get one of the junior techs to do it.

[BLADE]

Re: MP C2551 SC 400

have you tried a new belt, sometimes they need to be replaced, (I,m not too sure that sc400 is related to music bars so you may be barking up wrong tree), the laser unit might be dusty also

[Oze]

Re: MP C2551 SC 400

You don't have a doner machine hanging around in the shed mate?

[Iowatech]

Re: MP C2551 SC 400

Well, if the range of SP3-012s is anything else than 11s, it looks like you may have got a bad BCU to replace the first one.

There's a bulletin for both the 2550 and 2551 that covers SC400. You probably already have it, but since it seems to be a recurring issue with this chassis I'll put the 2551 version here anyway:

SC400 error.pdf

Stupid lack of detailed section in the manual, everything else appears to lead to the BCU for that pattern generation, but I'm not sure. My documentation is probably not up to date either.
Sorry if this was a waste of time.

[copyaction]

Re: MP C2551 SC 400

Try setting sp3324-006 to 1
have gotten rid of a couple sc400 codes with that when all of the normal fixes were not successful

[Lagonda]

Re: MP C2551 SC 400

At this stage of the game all suggestions, serious or otherwise will be considered!!

The bit that has got me puzzled is that I can get a nice dense colour copy but it refuses to develop the music pattern on the IT belt.

The trade-in copier I pinched the boards out of was an unknown quantity as I didn't bother to get a copy out of it before I ratted the parts. I'm now regretting that.
I just hope another MP C2551 gets traded soon so I have working box to test against.

[slimslob]

Re: MP C2551 SC 400

When an ID sensor assembly is replaced with a new one, the new one comes with a sticker that has the values for two SP settings SP 3362-013 and SP 3362-016. If you took the ID sensor from another machine and did not obtain the values for those SP settings, you might not be able to get it to function properly without ordering a new board. If you still have the original ID sensor follow the attached bulletin.

[BLADE]

Re: MP C2551 SC 400

a ptr fault can wipe patterns, what is the result history on sp3325, three fails or just one

[Polarbear]

Re: MP C2551 SC 400

Gentlemen,
Thank you for your fast replies but I should have been a little more explicit in my first post. Yes, the ID sensor has been replaced, that was the first thing the field techs tried.
The problem is the MUSIC bars are not being drawn on the ITB for the sensors to look at.
Yes, the ITB has been taken out and inspected and there is not a trace of the bars anywhere.

And sorry to say that this is one of the older copiers in our fleet and the birth certificate disappeared long ago. However I do have the full SMC report so I'll just have to go through it line by line and re-enter it all.
Better still, I'll get one of the junior techs to do it.

If you say that there are no lines whatsoever - it sounds like a memory/IPU issue.

When you select printer in sp mode (1103-02) and select colour test page, what happens? It should output a print with colour lines and blocks that indicate the density of the colours as well as their alignment.

Failing this, there seems to be a image generating problem, which points to IPU/BCU.

[Lagonda]

Re: MP C2551 SC 400

Haven't got as far as slashing my wrists yet.....but its getting close.

Readings for 3325 is 121 which tells me I have a Vsg issue. Probably induced by me swapping ID sensor boards around. Shall investigate further.

And just for fun I swapped the ops panel, more in desperation then a logical fault finding step. Still no joy.

Printer test pattern and copy of test chart attached that proves there is no problem with image creation so why the bloody hell won't it develop the music bars!!

[Lagonda]

Re: MP C2551 SC 400

201702081159.pdf

OK, lets try again and hopefully this time I managed to attach the attachment. It hasn't been a good week.

So they did attach the first time......buggered if I know whats going on.

[DougD]

Re: MP C2551 SC 400

Why don't you list in chronological order the steps you've taken so far.
It would be interesting to get not only the copy count on the developer but also the age if the developer is factory original.