Konica Bizhub C353 Print Head

[Oscar57]

Hi,

Can anyone tell me if the Black print head is the same as the other color print heads on a C353?

[NRTech]

yep. it's recommended that you change them as a set, but you don't have to, and they are interchangeable.

[907tec]

Just a warning: it is not ALWAYS possible to change individual print heads on this series. Sometimes it works, other times you have to replace them as a set.

[Hansoon]

Sometimes it works, other times you have to replace them as a set.

If it "not works" what would be the negative effect?

Hans

[907tec]

I can't remember the error code at the moment, but I just had an issue doing a print head swap on a C253 back in April. I attempted to swap the black printhead from a machine in my warehouse with one of my customer's. After replacing the Black printhead (only), the machine was generating a code related to the K laser Start-of-Scan abnormality. Init+Stab, grad. adjusts, skew adjusts would not get rid of it. If I remember correctly, the skew adjustments would drift. If I adjusted 10 'clicks' in the negative direction, the value would change by -20. If I adjusted 20 'clicks' in the positive direction, the value would change by +8. When I installed the other three printheads and ran the proper adjustments, the K-SOS codes disappeared and skew adjustments worked normally. I haven't had to do many C253/C353 laser swaps, but I would say at least 1/4 of them don't work when replacing an individual color.

[Hansoon]

Thanks.

Hans

[tech51]

I can't remember the error code at the moment, but I just had an issue doing a print head swap on a C253 back in April. I attempted to swap the black printhead from a machine in my warehouse with one of my customer's. After replacing the Black printhead (only), the machine was generating a code related to the K laser Start-of-Scan abnormality. Init+Stab, grad. adjusts, skew adjusts would not get rid of it. If I remember correctly, the skew adjustments would drift. If I adjusted 10 'clicks' in the negative direction, the value would change by -20. If I adjusted 20 'clicks' in the positive direction, the value would change by +8. When I installed the other three printheads and ran the proper adjustments, the K-SOS codes disappeared and skew adjustments worked normally. I haven't had to do many C253/C353 laser swaps, but I would say at least 1/4 of them don't work when replacing an individual color.
The printheads are rated A to D if my memory serves me correctly. I remember a KM bulletin some years back saying you could replace them individually provided you were only one rating out. IE an A with a B or a B with an A or a C etc etc. Maybe you had a print head that was rated too far from the others.
Having said that when they were failing a lot and stocks were low, we just chucked in whatever we had (including putting C253 PHs into C353s). We had very few failures, certainly a lot less than 25%!! Mind you I dont live in Alaska:))

[tbkarthic]

why you change that individual print head. i mean reason.

[Hansoon]

The printheads are rated A to D if my memory serves me correctly. I remember a KM bulletin some years back saying you could replace them individually provided you were only one rating out. IE an A with a B or a B with an A or a C etc etc. Maybe you had a print head that was rated too far from the others.
Having said that when they were failing a lot and stocks were low, we just chucked in whatever we had (including putting C253 PHs into C353s). We had very few failures, certainly a lot less than 25%!! Mind you I dont live in Alaska:))

Good info, though having seen that bulletin I forgot about it. Thanks for reminding me.

Hans

[tech51]

why you change that individual print head. i mean reason.
Basically speaking, they fail & give error codes. KM only supply them in sets of four but for cost reasons most people will only replace the failed one. They used to fail a lot but were modified a while back & are a lot better now.

[Hansoon]

They used to fail a lot but were modified a while back & are a lot better now.

Is there a marking on the units so one can distinguish the old from modified version?

(Sorry, keeping you busy....;))

Hans

[tech51]

Is there a marking on the units so one can distinguish the old from modified version?

(Sorry, keeping you busy....;))

Hans
Well, they were modified about 3 years ago so you won't get old ones now. Just replace them with new ones as and when needed. I seem to remember the modified ones had a green sticker on but I'm not 100% sure on that.

[yogeshmach]

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Thanks.

[Hansoon]

That's exactly what we need here. From now on our job will be much easier........

Hans

[Konicoz]

yep that's what I need a labelling machine.