Kyocera Taskalfa 5053ci - Banding issue

[joaopauloooo]

Hi, I'm new to Kyocera, always worked with Konica.
So, I bought this TASKalfa 5053ci, fairly new with 130k and it prints great, no big issues.
The only problem is that it's making this little white bands all over the page in all 4 colours.
I can not tell if they are on the same spot in all 4 colours, but doesn't look like.
The attached file was printed in Cyan on an A3 paper. I printed the same in M, Y and K and they all look the same, but I'm only uploading this cyan for reference.
What could cause this issue?

[Larhal]

Hi, I'm new to Kyocera, always worked with Konica.
So, I bought this TASKalfa 5053ci, fairly new with 130k and it prints great, no big issues.
The only problem is that it's making this little white bands all over the page in all 4 colours.
I can not tell if they are on the same spot in all 4 colours, but doesn't look like.
The attached file was printed in Cyan on an A3 paper. I printed the same in M, Y and K and they all look the same, but I'm only uploading this cyan for reference.
What could cause this issue?

That looks like developer banding. How old is the unit and has it been in storage for a while as developer powder can oxidise and loose it potential. if all 4 colours are doing it I would assume that moisture has effected the developer powder.

[Ropariva]

I’m sorry but that is a feature of this model. I’ve seen it worse than this and I’ve seen it better than this, but it’s always there to some extent on the high speed 53 series.
The low speed 25/35 ppm machines were perfect. The new generation hi speed 54 series are perfect. The engineers who designed this one got something wrong.
I’ve personally changed every consumable item in these machines in an attempt to resolve it but have only managed to make it slightly less visible.
Kyocera support have acknowledged the issue and have even released a bulletin regarding vibration at the IH coil wiring routing to explain it, but that was just BS..
If anyone out there has found a fix for this I’m happy to give it a try, but from my experience, this is how it is.
As the Japanese engineers say…”Please accept”

[tmaged]

https://www.copytechnet.com/forum/te...feed-direction

[tec966]

we sent a 6053ci to kyocera for repair for this problem but it came back in the same condition...

[Dark Helmet]

I’m sorry but that is a feature of this model. I’ve seen it worse than this and I’ve seen it better than this, but it’s always there to some extent on the high speed 53 series.
The low speed 25/35 ppm machines were perfect. The new generation hi speed 54 series are perfect. The engineers who designed this one got something wrong.
I’ve personally changed every consumable item in these machines in an attempt to resolve it but have only managed to make it slightly less visible.
Kyocera support have acknowledged the issue and have even released a bulletin regarding vibration at the IH coil wiring routing to explain it, but that was just BS..
If anyone out there has found a fix for this I’m happy to give it a try, but from my experience, this is how it is.
As the Japanese engineers say…”Please accept”

Working as intended

[PrintWhisperer]

....
The low speed 25/35 ppm machines were perfect. The new generation hi speed 54 series are perfect. The engineers who designed this one got something wrong.
I’ve personally changed every consumable item in these machines in an attempt to resolve it but have only managed to make it slightly less visible.
Kyocera support have acknowledged the issue and have even released a bulletin regarding vibration at the IH coil wiring routing to explain it, but that was just BS..
If anyone out there has found a fix for this I’m happy to give it a try, but from my experience, this is how it is.
As the Japanese engineers say…”Please accept”

Great observation - dead-on and it bears out my own personal theory on what is behind this well-known limitation.
Like everyone else I've fought this with every conceivable part at one time or another and came to the same conclusion that it was cooked into the hybrid developer design.

Notice the models you mention that do not have the problem all share a standard dual-component developer design.

That's right, in case you didn't notice Kyocera quietly abandoned the hybrid developer in the 4-series machines and saw an immediate color density improvement.

The mono-component roller at the point of contact with the drum has a tight spacing tolerance and I believe the banding is actually mechanical jitter from the drive pack. The spacing would be consistent with some gear lashing/jitter effects. The kind of thing those big flywheels on some manufacturers motors are there to prevent through conservation of angular momentum.
Once they started increasing the DPI print spec and reducing the particle size, they reached the limit of the technology without beefing it up like the 80/90 ppm machines.

FWIW😏

[Ropariva]

Great observation - dead-on and it bears out my own personal theory on what is behind this well-known limitation.
Like everyone else I've fought this with every conceivable part at one time or another and came to the same conclusion that it was cooked into the hybrid developer design.

Notice the models you mention that do not have the problem all share a standard dual-component developer design.

That's right, in case you didn't notice Kyocera quietly abandoned the hybrid developer in the 4-series machines and saw an immediate color density improvement.

The mono-component roller at the point of contact with the drum has a tight spacing tolerance and I believe the banding is actually mechanical jitter from the drive pack. The spacing would be consistent with some gear lashing/jitter effects. The kind of thing those big flywheels on some manufacturers motors are there to prevent through conservation of angular momentum.
Once they started increasing the DPI print spec and reducing the particle size, they reached the limit of the technology without beefing it up like the 80/90 ppm machines.

FWIW😏

Sounds like you also hark back to analog days with big heavy flywheels designed into the drive systems to reduce jitter. It seems to me the issue was mostly dev related as well but I also think the engineers of this series somehow managed to line up all the drive pulses across dev/drum/transfer and fuser to get this visible pattern.
We do refurbish a lot of models, but never a 4053/5053 for this very reason.

[PrintWhisperer]

Sounds like you also hark back to analog days with big heavy flywheels designed into the drive systems to reduce jitter. It seems to me the issue was mostly dev related as well but I also think the engineers of this series somehow managed to line up all the drive pulses across dev/drum/transfer and fuser to get this visible pattern.
.....

LOL...you got me...the first timing systems I worked on were cherry switches driven by cams on the main motor which weighed about 20 pounds 😆

BUT before that I repaired SAM radar jamming systems on A6 Prowlers so RF propagation and I go way back.

I'll buy in to the frequency problem when I see and O-Scope readout of a bias waveform harmonic distortion in the 75hz range with the amplitude it would take to produce that defect. 😎

Still, with that dual roller design and multiple biases I must admit it's possible....