550 sc 900. very important. i think i broke it

[ender]

It started with sc 302-1 corona current feedback too high. I replaced wire and grid. I removed dev and drum unit to clean inside of corona socket. when I reassembled I got SC 900. total counter contains something not a number. I have tried reseting all copy counters. no help. Man am I in trouble!

[copytech22]

Suggestions from Goose List

SC 9 00 01 mechanical total counter error replace IOB
SC 9 00 01 mechanical total counter error replace N V ram
SC 9 00 01 mechanical total counter error total counter and its connector
SC 9 00 01 mechanical total counter error use correct wire in correct corona unit
SC 9 00 electrical total counter error NV ram defective

SC 900 [SC900] - NV ram defective
SC 900-01 [SC900-01] - replace IOB
SC 900-01 [SC900-01] - replace N V ram
SC 900-01 [SC900-01] - total counter and its connector

SC 3 02 01 charge corona output error 1 charge power pack
SC 3 02 01 charge corona output error 1 replace corona assembly
SC 3 02 01 charge corona output error 1 replace drum bearing and charge power pack
SC 3 02 01 charge corona output error 1 use correct wire in correct corona unit

[ender]

Thanks Tech22. Any idea where I can get a NVRAM and aprox cost?

[Llama God]

Seems like an awfully big coincidence that it went off when you took parts out of it. Have you checked the connector on the back of the mechanical counter?

[mikadonovan]

Speaking from experience, you need to rule out all other possibilities before replacing the NVRAM. Even following the procedure to the letter does not mean that your machine will work right after that.

[ender]

Yeah, I remember it being difficult to hold developer leads away from stuff while I slide it back in. I will check the counter leads again. Thanks for the advise.

[ender]

I checked the mech. counter and sure enough I had pulled one of the leads out of the pin in thr 2p connector! Thanks. Now I am still having trouble with intermitant sc302-1 codes. I feel like I should start all over with new dev, drum,ect. kinda expensive for my church. any suggestions before I order PM kit?

[schooltech]

Did you replace the charge assembly yet? You may have an endcap leak at the spring end that contacts the terminal. Also, make sure that the springs are extended enough to make a good contact.

I see in the post that this is Ricoh 550 correct? They are old enough to where a charge leak from a tired charge unit is not out of the question.

Is it ready for a PM kit? A 302 code will not generally prompt for a kit, as it's an isolated problem. A full kit will be about $500-600.

Make sure the springs are properly extended first.

Throwing a PM kit at this is like throwing a new set of tires on a car when it just has a flat. Unless it's absolutely needed, I'd hold off as it's pretty expensive for a 302 code. Keep troubleshooting the entire charge assembly first, and look very closely at everything that may be touching something else, a trace of toner somewhere, or arcing inside the spring channel or something.

[Shadow1]

I assume image quality is O.K.
I fought with several MP1350's where the Charge would only last about 600k before I had to replace the entire assembly. I suspect the unit was being contaminated by chemicals used in their cheap recycled paper. The solution was to replace the charge (and in my machine precharge) assemblies and coat the inside of the new end caps with teflon grease (Old Lanier techs may remember this trick from the 6000 series machines)

[ender]

You guys saved my life!

I pulled it all apart yesterday and reinspected my work. The corona and grid looked fine. So did the springs connecting to the hvt sockets. I then decided to inspect the HVT (power pack?) and after removing it from the drum unit I noticed that the small 2P connector (white one) that goes to this strip of what appear to be chips or diodes or something. (drum current sensors?) was still holding one of the pins. I'm pretty sure i didn't pull the pin out of a solder joint so I figure it was a bad joint to begin with. I resoldered the pin and its mate just for grins and reassembed.
TRUM-TRA-TRUM !!!!!!
Thanks again for all of the help and advice.