C224e Print Quality Issues (Problem & Solution)

[srvctec]

Re: C224e Print Quality Issues (Problem & Solution)

Regarding the "dust problem" I could imagine that strong temperature differences plays a role. If the housing of the laser unit is warming up during operation, puffing out warm air from the inside and when later cooling off, it may be possible that, depending on the environment, polluted air is being sucked in somehow passing the sealing.

Hans

Hadn't thought of that and it's probably why they don't hermetically seal them. I sure wish they'd put in a miniature filter in the opening wherever it is, kind of like the little barometric breather filters that are in HDD's. Maybe that would keep it from sucking in dirt.

[tsbservice]

Re: C224e Print Quality Issues (Problem & Solution)

I have one of those PH units right now, looks pretty much good sealed and I have seen quite a few lasers way more unprotected. In fact we added some foams and seals(added late of production date) to Toshy laser as countermeasure years ago. Will take some pictures of unit to add here if srvctec don't mind.
Very informative thread though.

[srvctec]

Re: C224e Print Quality Issues (Problem & Solution)

I have one of those PH units right now, looks pretty much good sealed and I have seen quite a few lasers way more unprotected. In fact we added some foams and seals(added late of production date) to Toshy laser as countermeasure years ago. Will take some pictures of unit to add here if srvctec don't mind.
Very informative thread though.

Fine with me!

[Don N.]

Re: C224e Print Quality Issues (Problem & Solution)

Eh!?

Confirmed. Spacer/shim @ 2mm thick to keep the duplex gate solenoid from opening the gate too far when not actuated. There is a bulletin on that.
On the topic of C224e series poly mirrors with dust, not a one out of maybe a hundred in the field exhibits this... yet! Definitely seen that on Sharp, Samsung desktops years ago. have seen the mag rollers all get toner dust coated after a drum cleaning failure, resulting in similar shading/background, not faded area. Also drywall dust is the major culprit if any fine dust invades.

[tsbservice]

Re: C224e Print Quality Issues (Problem & Solution)

Here are some pictures of PH unit from C224e.

[iraklis7302]

Re: C224e Print Quality Issues (Problem & Solution)

A co-worker (larweedad on here) had a call on a C224e with light prints on the side of the page nearest the rear of the machine. All 4 colors were identical with the symptom. He changed the belt and transfer roller which made no difference. Also changed the interior side door that holds the secondary transfer roller- also made no difference. The last thing that was swapped was the high voltage board which also made no difference. The test print of halftone set to 150 density was stopped mid cycle that showed the lighter image towards the rear of the drum, even before the image was transferred to the belt. This means the laser unit had to be the issue.

We took apart the unit (totally shocked it isn't hermetically sealed) and cleaned the very dusty inside using cotton swabs and alcohol on all the mirrors and PH windows, inside and out. Put it all back together and it still had the same issue. Then I had an epiphany. What if the mirrors on the polygon motor had dust on the trail edge? Wouldn't that cause the issue since one pass of the mirror makes one line on the page?

We took apart the PH unit again and removed the access cover over the polygon motor and cleaned all 7 mirrors. That was the issue!! Why in the heck these PH units aren't hermetically sealed is beyond me. BUT, if we ever see these symptoms again, we'll know exactly what the issue is.

Attached are the scanned pages before and after (all at 100 density in service mode) as well as a photo of one of the very dirty polygon mirror faces.

[ATTACH]43319[/ATTACH]

[ATTACH]43320[/ATTACH]

Hi sir!

probably I have the same problem.could you please tell me (or show me in any photo) ,where are these 7 mirrors?thank you?

[m_donakov]

Re: C224e Print Quality Issues (Problem & Solution)

Hi sir!

probably I have the same problem.could you please tell me (or show me in any photo) ,where are these 7 mirrors?thank you?

They are inside laser unit, you can see the you tube video below how to remove laser unit from machine, then open the black laser unit box. Polygon motor is inside. Here is the youtube video.

https://youtu.be/a-Sy9ykiSyI

[iraklis7302]

Re: C224e Print Quality Issues (Problem & Solution)

They are inside laser unit, you can see the you tube video below how to remove laser unit from machine, then open the black laser unit box. Polygon motor is inside. Here is the youtube video.

https://youtu.be/a-Sy9ykiSyI

thank you very much!

[iraklis7302]

Re: C224e Print Quality Issues (Problem & Solution)

They are inside laser unit, you can see the you tube video below how to remove laser unit from machine, then open the black laser unit box. Polygon motor is inside. Here is the youtube video.

https://youtu.be/a-Sy9ykiSyI

i have cleaned the 7 mirrors from polygon motor but the problem have been worst,am i wrong with anything?

[m_donakov]

Re: C224e Print Quality Issues (Problem & Solution)

i have cleaned the 7 mirrors from polygon motor but the problem have been worst,am i wrong with anything?

I dont know what can be, you can see mirrors in laser unit maybe they are dirty too. If you can scan printed page an post here i will try to help you.

[tsbservice]

Re: C224e Print Quality Issues (Problem & Solution)

i have cleaned the 7 mirrors from polygon motor but the problem have been worst,am i wrong with anything?

You better start your own thread ideally with a lot of pictures and description. Not posting here and there incomplete questions inbetween forum.

[iraklis7302]

Re: C224e Print Quality Issues (Problem & Solution)

You better start your own thread ideally with a lot of pictures and description. Not posting here and there incomplete questions inbetween forum.

ok im sorry,thank you

[zeckryyu]

Re: C224e Print Quality Issues (Problem & Solution)

A co-worker (larweedad on here) had a call on a C224e with light prints on the side of the page nearest the rear of the machine. All 4 colors were identical with the symptom. He changed the belt and transfer roller which made no difference. Also changed the interior side door that holds the secondary transfer roller- also made no difference. The last thing that was swapped was the high voltage board which also made no difference. The test print of halftone set to 150 density was stopped mid cycle that showed the lighter image towards the rear of the drum, even before the image was transferred to the belt. This means the laser unit had to be the issue.

We took apart the unit (totally shocked it isn't hermetically sealed) and cleaned the very dusty inside using cotton swabs and alcohol on all the mirrors and PH windows, inside and out. Put it all back together and it still had the same issue. Then I had an epiphany. What if the mirrors on the polygon motor had dust on the trail edge? Wouldn't that cause the issue since one pass of the mirror makes one line on the page?

We took apart the PH unit again and removed the access cover over the polygon motor and cleaned all 7 mirrors. That was the issue!! Why in the heck these PH units aren't hermetically sealed is beyond me. BUT, if we ever see these symptoms again, we'll know exactly what the issue is.

Attached are the scanned pages before and after (all at 100 density in service mode) as well as a photo of one of the very dirty polygon mirror faces.

[ATTACH]43319[/ATTACH]

[ATTACH]43320[/ATTACH]

Actually this is typical problem,when the machine is using polygon motor...i had encounter this same problem on canon machine

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