4002i

[ntbann]

Re: 4002i

Yes I promise it is a new DV unit. I unboxed it. Tried the THV today along with the plastic housing that contains all the springs. Still the same. Have a Main PWB coming on Monday.

[spw]

Re: 4002i

The units that were put in, are they new units? Or t/o for testing purposes?

[ntbann]

Re: 4002i

brand-new.

[spw]

Re: 4002i

Just a thought on the HV unit. Did you depress each spring physically to check for internal damage to the springs? some have a catch in them and make intermittent contact. Their springiness ( technical term lol) isnt consistent.

[ntbann]

Re: 4002i

I swapped the housing with all the springs.

[Santander]

Re: 4002i

First thing I would do is make sure all the DV settings in the sims mode are set to factory defaults. If someone has played around with the settings it could create havoc. And now from far left field, your picture reminded me of a problem we had a number of years ago on an older model that looked very similar. Turned out the fuser was not heating properly and the press roller had ridges on it. Apparently the fuser would push unfused toner and then fuse it creating the wavy pattern I saw in your example. Just a thought.

[KYO_OEM]

Re: 4002i

What happens if you set "U100/ Set ACAutoAdj" to "OFF" instead of "ON" ?
System will print with initial values instead of calculated values.
It's only for analysing...you has to switch back it later.
Can you share U000 / *.txt file?

[BillyCarpenter]

Re: 4002i

What happens if you set "U100/ Set ACAutoAdj" to "OFF" instead of "ON" ?
System will print with initial values instead of calculated values.
It's only for analysing...you has to switch back it later.
Can you share U000 / *.txt file?

KYO always comes up with some interesting troubleshooting methods. I don't always understand them at first and he has to explain it to me like I'm a child but eventually I seem to get it.

I have never turned off U100 or adjusted the values of the many ac/dc bias voltages. The manual explains what will happen if the values are changed - print gets lighter or darker.

Can you explain the thought process behind turning off U100 and how it will aid in identifying the problem? I'm very interested in this. Thanks.

[KYO_OEM]

Re: 4002i

depended to the age of parts, current enviroment and so on, system will increase or decrease needed voltages for LK, MC, DV, TR ....
If you now switch off the auto adjustment, system will run with initial values instead of calculated voltages.
e.g.
you can use it if you get white prints.
I want`s to check if i get needed high voltage on DV.
If i remove the MC to get 0V potentialon on DK, system will show C510x, because wrong voltage on DK surface
If you now switch off U100 you get no more c-call and in case of missing MC and 0V on DK surface you get full solid color printout without margins.
Than you know high voltage for DV is present and you can look for TR or LK.
In other cases, if DK or DV from Iris would mounted by plugged in power plug, counters wouldn`t set to "0" or else.
Now you get background because there are total wrong counters and system can`t calculate the needed correct voltages anymore.
Now with U100/ OFF, sometimes you can get system running until you are able to install new part in the right way.

[BillyCarpenter]

Re: 4002i

depended to the age of parts, current enviroment and so on, system will increase or decrease needed voltages for LK, MC, DV, TR ....
If you now switch off the auto adjustment, system will run with initial values instead of calculated voltages.
e.g.
you can use it if you get white prints.
I want`s to check if i get needed high voltage on DV.
If i remove the MC to get 0V potentialon on DK, system will show C510x, because wrong voltage on DK surface
If you now switch off U100 you get no more c-call and in case of missing MC and 0V on DK surface you get full solid color printout without margins.
Than you know high voltage for DV is present and you can look for TR or LK.
In other cases, if DK or DV from Iris would mounted by plugged in power plug, counters wouldn`t set to "0" or else.
Now you get background because there are total wrong counters and system can`t calculate the needed correct voltages anymore.
Now with U100/ OFF, sometimes you can get system running until you are able to install new part in the right way.

Very cool. I'm gonna give this a try. I always learn something from you. Thanks.

[blackcat4866]

Re: 4002i

depended to the age of parts, current enviroment and so on, system will increase or decrease needed voltages for LK, MC, DV, TR ....
If you now switch off the auto adjustment, system will run with initial values instead of calculated voltages.
e.g.
you can use it if you get white prints.
I want`s to check if i get needed high voltage on DV.
If i remove the MC to get 0V potentialon on DK, system will show C510x, because wrong voltage on DK surface
If you now switch off U100 you get no more c-call and in case of missing MC and 0V on DK surface you get full solid color printout without margins.
Than you know high voltage for DV is present and you can look for TR or LK.
In other cases, if DK or DV from Iris would mounted by plugged in power plug, counters wouldn`t set to "0" or else.
Now you get background because there are total wrong counters and system can`t calculate the needed correct voltages anymore.
Now with U100/ OFF, sometimes you can get system running until you are able to install new part in the right way.

We used to do something similar on the Canon analog devices. It was relatively common to get failures of the drum potential sensor, producing a wide variety of quality issues. Turning OFF drum potential reverted all the associated drum potential voltages to factory defaults (lamp current, high voltage, transfer current, developer bias). You could get decent copies until the sensor was changed. The funny thing was that in class we were told that those drum potential sensors were extremely delicate.

On a whim, I took a malfunctioning DPS and banged it hard against the counter (after all, how could it work worse?). To my surprise it started working. It turns out that about half of them do resume working after a hard bang. =^..^=

[tmaged]

Re: 4002i

"It turns out that about half of them do resume working after a hard bang."

Same !

[avio2]

Re: 4002i

check the contact spring dv dk-mc for me

[ntbann]

Re: 4002i

Update: after swapping every part in the machine with no change. We ran U140 AC calibration again and it started working.