IRA8295 slowing down during printing

[DarkoMAL]

Hello,

Machine after 20 - 30 copies starts to slowing down from 95ppm to about 50-60ppm ( somethimes stops printing at all ) and after 10 seconds speed goes up to full speed.
This behavior is repeated all the time during long run. No error message, no jams.
We noticed that this is related to the temperature of fixing unit because temperature oscilates from 202 to 176 degreese when machine stops, and to 186 degreese at slow speed period.
On IRA8105 beside temperature oscilating max 5-6 degreese from 202 and there is no slowing down at all.

Machine have implemented "Down Sequence Control " in case of great difference beetwen the target temp. and detected temp.
In this case machine slows down to prevent fixing failure.
But In normal circumstances down seq. control should occur only with heavy paper or when switching from plain to heavy or thin to heavy ...

Customer use only plain paper and i'm not sure what's happening and why temperature drops so suddenly.

What we tried to do with no results ...

COPIER>OPTION>IMG-FX>FIX-TMP4 ...
COPIER>OPTION>IMG-FX>TEMP-TBL ...
Replaced the fixing unit from the IRA8105 that is operating normally ...
Upgrading newest firmware ( System , DC .... ) ...
At last we tried to replace Main drive Driver PCB Assy but device is still slowing down and temperature oscilate a lot.

We also doubt to DC controller but do not have it in stock.

Any sugestions until we get new DC controller PCB ????


Thanks
Darko M

[zoraldinho]

Re: IRA8295 slowing down during printing

Hi Darko!

We are almost neighbors I suppose!

Just a sugestion before new DC controller PCB.

Controller self diagnostics function find something ?

Did you check priority?

Settings/Registration > Function Settings > Common > Print Settings > Thin/Plain Paper Printing Priority
Settings > Quality Priority Productivity priority


Change the level of Quality Priority as follows:

Service Mode > COPIER > OPTION > IMG-FX > FX-IMGLV > 1
0: Text document mode (Image quality is decreased, but productivity is improved.)
1: Photo document mode (Image quality is improved, but productivity is decreased.)

Paper is A4 format?

[DarkoMAL]

Re: IRA8295 slowing down during printing

Hi Darko!

We are almost neighbors I suppose

Thanks for reply, If you're from Croatia then we are almost neighbors ... I'm from Zagreb.

Controller self diagnostics function find something ?

I'm not sure what you mean by Controller self diagnostics function ... there is no error messages in error history..
Can you explain me this a bit ?

Did you check priority?

Settings/Registration > Function Settings > Common > Print Settings > Thin/Plain Paper Printing Priority
Settings > Quality Priority Productivity priority

Yes, we checked the priority.

Change the level of Quality Priority as follows:

Service Mode > COPIER > OPTION > IMG-FX > FX-IMGLV > 1
0: Text document mode (Image quality is decreased, but productivity is improved.)
1: Photo document mode (Image quality is improved, but productivity is decreased.)
?

I'm a bit confused ...

Service Mode > COPIER > OPTION > IMG-FX > FX-IMGLV > 1
1: Photo document mode (Image quality is improved, but productivity is decreased.)

Photo document mode should decrease productivity.
This switch is on default "0:Text document mode" ...

Paper is A4 format?

Yes, they use only A4 plain paper ...

[zoraldinho]

Re: IRA8295 slowing down during printing

Did you think that the problem maybe can be with processing and machine consequently slow down? Consequently temperature oscilate.
Clear MMI maybe? If you do, take care for data.

[zoraldinho]

Re: IRA8295 slowing down during printing

KSU?

[DarkoMAL]

Re: IRA8295 slowing down during printing

I'm pretty sure that problem is related to huge oscilation of temperature.
On all other machines temperature oscilates max 5 degreese.
On this machine it's oscilates 20 - 30 degreese.

We tried to clear MMi , DC, Main. Cont. with no results. ( We take care for data after that ).

[canonbundy]

Re: IRA8295 slowing down during printing

Couldn't be something as simple as cleaning, reseating or replacing the Thermistor set could it???

[DarkoMAL]

Re: IRA8295 slowing down during printing

Couldn't be something as simple as cleaning, reseating or replacing the Thermistor set could it???

We tried to replace the fixing unit from another machine. Problem remains ...
And another machine is working normaly with suspicious fixing unit.

[V-P]

Re: IRA8295 slowing down during printing

Try to run consequent batches of 20.

So place an original in the glass and make 20 copies. When it is done do it again.

Do this procedure a few times and check if speed is slowing down.

Than put heavy paper (heavy 2 at least) and run it for 50 or more. Would the symptom appear ?

[onlyinnewfoundland]

Re: IRA8295 slowing down during printing

Is this happening on printing only? Is it possible that the customer has something other than plain paper as the paper type?

It sounds like the down sequence is cutting in too much...plain paper shouldn't be taking that much heat away from the fuser. The speed shouldn't drop that much based on plain paper.

See the info below

control.JPGdown.JPG

[DarkoMAL]

Re: IRA8295 slowing down during printing

Try to run consequent batches of 20.

So place an original in the glass and make 20 copies. When it is done do it again.

Do this procedure a few times and check if speed is slowing down.

Than put heavy paper (heavy 2 at least) and run it for 50 or more. Would the symptom appear ?

Machine is still at customer place.I can't try this now.
This week we will replace it with another one, then we'll be able to make a detailed analysis.
As i remember symptom start accuring after 25 copies or prints.
Consequent batches of 20 should work ok because device has a time to heat up fixing unit again.
I will let you knoow when i try ...

[DarkoMAL]

Re: IRA8295 slowing down during printing

Is this happening on printing only? Is it possible that the customer has something other than plain paper as the paper type?

It sounds like the down sequence is cutting in too much...plain paper shouldn't be taking that much heat away from the fuser. The speed shouldn't drop that much based on plain paper.

See the info below

They use only A4 plain paper and we checked few time paper type in machine.
Yes, i agree... According to the manual it shouldn't drop so much with plain paper.

[Nutstar]

Re: IRA8295 slowing down during printing

They use only A4 plain paper and we checked few time paper type in machine.
Yes, i agree... According to the manual it shouldn't drop so much with plain paper.

unless I misunderstood him, I think he meant driver settings for the customer that is printing.

if the driver is set to paper type heavy 2 for example the machine will behave as if heavy 2 is in the tray even if it is plain.

double check the driver settings.

[DarkoMAL]

Re: IRA8295 slowing down during printing

unless I misunderstood him, I think he meant driver settings for the customer that is printing.

if the driver is set to paper type heavy 2 for example the machine will behave as if heavy 2 is in the tray even if it is plain.

double check the driver settings.

I didn't check driver setting. I will at next visit.
But the same problem appearing with copiing too ...not just with print.

[V-P]

Re: IRA8295 slowing down during printing

basically what you need to do is:

put some plain paper on stack bypass and register it as heavy 2.

Than make copies from the stack bypass - (no need for printing).

All of these (and the 20 batches test) are mostly to specify if error happens due to DC or not.

If machine runs heavy 2 in the speed it should run without drops in speed - it will mean that mechanically everything is fine.

I would try heavy 3 and some other kind just to be sure...