KM 5050 duplex printing error(cassette 1)

**Crni** · 07-07-2014

Hi guys.

My machine suddenly started giving me error when duplex printing from cassette 1. It was working fine before.

1 case: It starts fine giving me 2 duplex prints then prints only on one side and ejects the paper, error pops out (paper jam) with next paper in line waits in the middle of paper feeder.
2 case: Again starts good then ejects only one side print and the next paper starts coming out, error pops out (paper jam) with that next paper being half way out.

Any ideas what is the cause of this ?

Printing one sided on cassette 1 is ok and cassette 2 is printing duplex just fine.

**Tonerkiller** · 07-07-2014

I would replace the turnover section

**blackcat4866** · 07-07-2014

Jam code? Media type? Media size? =^..^=

**Kyo fan** · 07-07-2014

First print the event log and analyze latest jams you've had (use the service manual). In your case i would check middle feed assy (gear holder plastic can break) and as Tonerkiller mentioned, turnover section on the left side big door which can deform due to fuser hear and toner likes to stick to it.

**Crni** · 07-08-2014

Code is JAM61, plain A4 paper. Yesterday I did find a small plastic holder ring in my Cassette 1 tray. Don't know where it came from :/

**Kyo fan** · 07-08-2014

In that case the duplex paper conveying switch DUPPCSW or feed switch 1 FSW1 (also check it's actuator) could be faulty. Run U031 and turn those switches on and off manually.

**Crni** · 07-08-2014

Hey guys problem fixed for now !

I disassembled mid feeder section and cleaned all the rollers, I spread the springs behind the rollers.
Found that the plastic holder ring was from small clutch motor on mid left section, assembled all and now duplex is working

.

I don't know if the holder ring was to blame or dirty(and old) rollers, springs.
I suspect the rollers didn't have grip to pull back the paper but then Cassette 2 wouldn't work also

hm hm.

What type of grease or oil do you use for those small rotating parts like plastic rollers? I noticed that there was some green grease applied.

Anyone uses silicon spray?

**blackcat4866** · 07-08-2014

Originally Posted by Crni

... What type of grease or oil do you use for those small rotating parts like plastic rollers? I noticed that there was some green grease applied.

Anyone uses silicon spray?

Not silicone, not spray, not silicone spray. 3 in 1 Oil or TriFlow is preferred, and just a drop or two, only if it makes noise. Dry is better if it's quiet.
=^..^=

**Zackuth** · 07-09-2014

Take a look at the feed tires, maybe replace them first. I know this sounds strange, but I had a machine with the exact same problem as the one you describe and feed tires was the fix.

**Crni** · 07-09-2014

Originally Posted by blackcat4866

Not silicone, not spray, not silicone spray. 3 in 1 Oil or TriFlow is preferred, and just a drop or two, only if it makes noise. Dry is better if it's quiet.
=^..^=

Well I can't find that oil in Croatia

And if I get it over ebay I don't know if it will be original.
Any other lubricants that are good enough?

PS

So I need a dry oil lubricant?