Help with C500 SC45-20 Error (PS8 & 9)

[Stirton.M]

It is entirely possible that the sensors may have dust on the inside surface of the transparent plastic window of the sensor itself. Unfortunately, this cannot be determined without pulling the unit out of the machine and inspecting in bright white light to see the dust inside the lens. Also unfortunately, it is a difficult item to service as the casing of the sensor is fragile...use extreme care when trying to pop the cover off to clean the inside of the window...use a q-tip.....

[HORSE]

Could be dirty sensors alright I have had that but usually for intermittent 4520 rather than a hard on fault. Which leads me to the next question does it bomb out every time or does it work sometimes?

Has the tech checked that the shutter solenoid is operating? If the shutter not opening sensors wont work anyway.

[dagoof]

Thanks Stirton, if I get that far I'll consider myself warned!

Horse - not sure if it's 45-20ing every time (haven't had it on myself this year), I know it gave a 28-01 last time too, but I'll let you know.

The tech said he thought one of the shutters was jamming so removed a spring - I'm not sure whether he replaced the spring or just stuck it open.

[seniortech]

I had a 45-20 code recently, turned out the black dev unit had totally siezed...

[dagoof]

Is there any way to determine if a dev unit is at fault seniortech? The machine's been lying for 18 months now and we were hardly getting any colour output on the charts - the tech changed the dev (which got us the colour back nice and strong) but he didn't change the dev units. EDIT: a quick read suggests if the dev unit is binding I wouldn't get all the colours (but I do, all be it out of reg.).

I've just spent a couple of hours trying stuff out - the printer vertical mag adjustment was quite far out so I correct that (the horiz. and belt adjustments were fine). The scanner mag adjustment says to scan a test chart - could anyone tell me where to get this?

After I'd made these corrections I tried an auto colour registration adjustment but it gave an "error 2". Can anyone tell me what this is? Also, I'm gone into the manual adjust screen and get all the values but how do I make the adjustments?

[Mikey]

Thanks for the replies, I appreciate it. I should mention that last time we'd tried to fix this (almost a year ago) he'd had to replace the corona wires, and on starting up again this time round one of them had blown again. He said he'd be concerned if this happened again (that it could point to an HV problem) but luckily it didn't. Said it could just be down to the fact it's been sitting in a cold garage for 18 months.

Stirton - can you replace the sensor assembly separately, or just the whole registration unit?

Coptech & Seeb - thanks, I'll try both and see where it gets me.

Horse - it's giving the registration read-offs so I'm assuming so (and would've thought the tech would've been aware if that was an issue) but I don't actually know myself.

If it came to it I'd be prepared to find someone to do soldering if I could get an ICP. I'll be a broken man if it comes down to the PRCB - I convinced my dad we should buy this machine and it's cost several thousands already and so far it's scrap

Yes start checking the front and rear color registration sensors. Maybe there is loose connection. Remove the PCRB and check it carefully. Maybe there is cold solder or problem with the connectors. Hope the trouble is minor. Good luck.

[stevel]

sc45-20 code issues

now having a qty of 8 bizhub pro c500 copiers at one location with some of them being the ikon version, i have seen my share of sc45-20 codes. this code always has to do the copy quality during color registration that these copiers will do all the time. the following parts all contribute to the sc45-20 code. bad/worn developers, transfer belt, drums, charge wires and grid, ts rollers, ts cleaning unit assy. anything that causes copy quality issue with test patch development on the transfer belt, when ps 8 and 9 can read them
you will get the service code.
also, if ps 8 and 9 are dirty, shutter plates not moving, spring fell off shutter plate. everytime other techs changes sensor assy, it is not the problem. just clean and inspect them and focus on copy quality of test patch/image development. (no scratchy image)
stick to Konica and change the drums, developers and pm kits and the copier will run well with very little problems.

[dagoof]

Thanks Steve, we've kind of ruled out any of the components being bad - the tech was convinced it was PS8 & 9 (and therefore the reg. unit). I'm working 7 days a week atm so am struggling to find time to solve this but going to try cleaning the sensors again tomorrow.

I'm still getting the 'error 2' when trying an auto adjust - manual suggests this is 'too much difference in registration'. Someone else told me it could be that the waste toner door's open (?) - we initially had a problem with the unit recognising the waste toner bottle (or the door - can't remember) but the 1st tech I had round by-passed this. It could be that the 2nd tech reset it so was just wondering how I could eliminate (or re-disable) this?

[dagoof]

Also, trying to do a manual adjust, when put the test sheet on the glass and hit 'scan' on the touch screen nothing appears to happen - could anyone help with that?

[Onetouch]

What I'm going to ask is not related to the same question but since this post got so many reply maybe one of you can help me.
I have the same machine C500 but I have problem with fusing. If the page has full colour and dens it dosen't fuse it or mostly it get jam at the fuser so I registerd 20lb. paper as NORMAL 5 which is ok and no jam so far. But if I print on 80lb. glassy paper some spot or one side usually dosen't fuse. I tried all kind of paper registration COATED and NORMAL but still dosen't work. I did fixing adjustment with Cyan density set up 88 but I don't have the chart to compare and I'm not % 100 sure if I did it right. My fixing roller are new. Any idea or suggestion? By the way I did changed the fixing roller but not the ball bearing. Is that can cause the problem? Thanks.