B&W 250 350 ATDC Sensor Gain ? c2557

[fishleg]

We had a machine just recently where literally all we did was clean the drum unit out and checked over the dev unit and the dreaded c2557 code appeared....

Unfortunately to clear it we had to chuck decent dev in the process then run F8. On these forums people mention that manually changing the Sensor Gain can let you switch units I'm just wondering to what success and how hard it actually is ?

Obviously changing the sensor gain is just to fool the machine into thinking the t/c ratio is good so you can pull toner from the dev unit but in the end you always have to get a good F8 result for long term usage ?

ATDC Sensor Gain is this just controlling the voltage to the atdc sensor ? just to help understand what is happening by changing this value.

If you had two machines and you knew the gain value could you in theory swap the units round ?

And can you do an auto toner supply on these ?

Thanks massively for any help with this evil code,
Mike

[fixthecopier]

If the number of copies on the image unit was not way out of range you can trade units. There may be someone who has had sucess with adjusting the gain. Konica has made the machines more sensitive over the years. Adjusting the gain on the bizhubs seem to be a temp fix and in some cases it may cause a call back with spots in the background. If you turn the change image unit message off in the soft switch settings you can run 25 to 100% over life.
Unlike the 2510/3510 series in which you can cange the drum and use the old developer, it is not going to happen here. It is not just the gain that effects the print quality, but the number of copies that the machine thinks is on the drum that will effect print quality. If you could alter that number it would make it eaiser. Anoother tip that may help is to checck the collars on the dv box against what they feel like on a new dv box. The collars get loose and will take out the drum with huge scrapes on the outside edge. Over half of my dv boxes have to be changed after they have 200,000 on them.

[Hansoon]

Change image unit message, soft switch please.

What is the soft switch setting for the BH350 to turn the change image unit message off?

Hans

[ck1]

Change image unit message, soft switch please.

What is the soft switch setting for the BH350 to turn the change image unit message off?

Hans

but must take care of the collar of ceveloper tank

[fixthecopier]

Change image unit message, soft switch please.

What is the soft switch setting for the BH350 to turn the change image unit message off?

Hans

Go to tech mode, soft switch settings. In the top block, put in "418"
In the middle block, flip bit 3 to "0"
Reboot main power

[Hansoon]

Go to tech mode, soft switch settings. In the top block, put in "418"
In the middle block, flip bit 3 to "0"
Reboot main power

Many thanks FixTheCopier!

Hans

[Hansoon]

but must take care of the collar of ceveloper tank

@ck1:

Drunk or just stupid?? COLLEAGUE?

Hans

[fishleg]

Can you do anything with these collars any tips for spotting bad ones ?

I've seen these bad boys completely destroy drum units especially the ones on the transfer roller can anything be done to prevent this ?

Cheers,
Fishy

[Hansoon]

Can you do anything with these collars any tips for spotting bad ones ?

I've seen these bad boys completely destroy drum units especially the ones on the transfer roller can anything be done to prevent this ?

Cheers,
Fishy

We have a shop make us these collars with integrated bearing.



This is a preliminary version, next production we reduce the outside diameter of the ball bearing to 10mm instead of 13mm to have more plastic "meat" around it to avoid cracking of the plastic when getting old.

USD 6.85/piece. Minimum 25 pcs.

Anybody interested?

Hans

[ck1]

We have a shop make us these collars with integrated bearing.



This is a preliminary version, next production we reduce the outside diameter of the ball bearing to 10mm instead of 13mm to have more plastic "meat" around it to avoid cracking of the plastic when getting old.

USD 6.85/piece. Minimum 25 pcs.

Anybody interested?

Hans

Can solve the problem or just extend the life of it ?