Noise bizhub 458

[Bix]

Hi guys,
I have an annoying problem with a bizhub 458.
For about 3 days I'm trying to solve this annoying noise that you hear in the video: YouTube

It is a printer with around 400,000 copies and has always received regular maintenance with original consumables (drum, tray rollers, transfer belt ecc.).
It also has an FS-536 finisher but the problem is located on the machine. In fact, the noise comes in the upper part, exactly towards the output of the sheets (both single copy and two-sided copy).

I tried to clean and grease the gears I could see by opening the right-hand door of the printer without success.


The noise seems to come just above the fuser. I think it's a fuser problem, even if it has not yet reached its life (in the manual it says 600k).


What do you think about it?


Thanks in advance

[tech51]

Have you had the exit/reversal unit out and inspected it yet?

There is a bush that wears out on the upper part of the exit unit which allows the drive belt to jump.

Only had a couple of machines do this out of a couple of hundred I have out there but it does happen.

You will have to remove and inspect the unit as the part that wears is not visible with the unit in place.

[Bix]

Hello thanks for the reply.


Unfortunately, not yet. In the past I disassembled it in a MFP but I do not remember bushes. Maybe you mean gear? Sorry for my English. Currently I have only lubricated them (only the visible ones), with some grease. Do you have any advice on where to inspect?

paperexit.jpg
Thanks again!

[allan]

Part no 1 is your problem there.

Jip the belt slips but does not jam.
I drill a hole where the busing is and glue a brass bushing in there.
Started doing that after replacing the part, just leads to the same failure.
Hopefully there is a revision made by now.

[Bix]

Part no 1 is your problem there.

Jip the belt slips but does not jam.
I drill a hole where the busing is and glue a brass bushing in there.
Started doing that after replacing the part, just leads to the same failure.
Hopefully there is a revision made by now.

If I'm not mistaken, it's in metal. What could have happened to cause that noise and then request replacement?


Thanks for the support

[Bix]

Ok, maybe I understand what you mean. Under that holder there is something rubber / other material that over time is consumed and it blows the belt?

[Bix]

I saw that they modified the piece in the part list (from A79J897611 became A79J897612) on 04/04/04.
The machine was installed a few months after that date, so I do not know if their modification was effective.

[allan]

That plastic is too soft to carry a shaft.
That mod does not seem to address to problem the way i would do it...
Its a 50 min job to get there and back on a slow strike. Plenty of covers needs to come off.

The belt survives it only the tension goes due to the shaft chewing the plastic in that direction.
Noise is from the belt jumping teeth

[Bix]

Hello, piece arrived and now I will try to replace it. The piece is all plastic. I saw that inside there are little teeth, also in very light plastic.


Before the piece arrived, I did some proof. If I hold a plastic up on the rollers with my finger, the noise is gone. I wanted to try but put a thickness but then it's a problem when they do duplex

[allan]

Hello, piece arrived and now I will try to replace it. The piece is all plastic. I saw that inside there are little teeth, also in very light plastic.


Before the piece arrived, I did some proof. If I hold a plastic up on the rollers with my finger, the noise is gone. I wanted to try but put a thickness but then it's a problem when they do duplex

Now keep the old part and use an old 652 feed unit bushing to fix it.