RICOH 2555 SC672

[mgipa]

Hello everybody, photocopy Ricoh 2555 sc672-21. Help me?

[davel]

Re: RICOH 2555 SC672

Look it up in service manual.

[mgipa]

Re: RICOH 2555 SC672

Look it up in service manual.

I followed the instructions of the service manual. but can't. I changed the controller and it worked. I want to know better what's wrong with the controller

[anothertech]

Re: RICOH 2555 SC672

The only people that know what goes wrong with boards are the techs at the board repair places, like Hytec.

[slimslob]

Re: RICOH 2555 SC672

It could have been something as easy as a cold solder joint on a connector to a defective custom component that you might not be able to source unless you want to purchase in lots of 100 or more. In addition most current PCB are multi-layer with plate through component holes. If you do not have the proper equipment for removing components you will damage the board.

[davel]

Re: RICOH 2555 SC672

The reliability of Ricoh controller boards has been getting progressively worse over the years. I suspect cheaper components being used to save money.

[anothertech]

Re: RICOH 2555 SC672

The reliability of Ricoh controller boards has been getting progressively worse over the years. I suspect cheaper components being used to save money.

Yes I agree, 15-20 years ago it was very rare to replace a controller board, now it's pretty common.

[mgipa]

Re: RICOH 2555 SC672

The only people that know what goes wrong with boards are the techs at the board repair places, like Hytec.

I very much agree with your opinion. I gave it to the circuit board repairers. they don't dare to accept the repair because it's too new, they don't have a machine to try

[mgipa]

Re: RICOH 2555 SC672

The reliability of Ricoh controller boards has been getting progressively worse over the years. I suspect cheaper components being used to save money.

very accurate my friend

[mgipa]

Re: RICOH 2555 SC672

very accurate my friend

I'm thinking it's an OS bug. Since the bios/os led on the controller it blinks continuously, according to the service manual it lit. I will copy nvram 1 and 2 to try first

[Phil B.]

Re: RICOH 2555 SC672

Yes I agree, 15-20 years ago it was very rare to replace a controller board, now it's pretty common.

Yup +1

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[rthonpm]

Re: RICOH 2555 SC672

The reliability of Ricoh controller boards has been getting progressively worse over the years. I suspect cheaper components being used to save money.

Two major things have happened:

Heavy metals like lead have been removed from solder and other components, which has made solder especially a little less reliable but the boards are less toxic.

Boards have gotten denser: compare a board from an older machine like a 1027 to a newer one and the old board looks almost primitive. The connections now almost require a microscope to find failures.

I have a few friends who've been in electronics manufacturing, according to them the fact that anything works as reliably as they generally do is almost miraculous considering the very small margins of error in the build process.

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[BillyCarpenter]

Re: RICOH 2555 SC672

Two major things have happened:

Heavy metals like lead have been removed from solder and other components, which has made solder especially a little less reliable but the boards are less toxic.

Boards have gotten denser: compare a board from an older machine like a 1027 to a newer one and the old board looks almost primitive. The connections now almost require a microscope to find failures.

I have a few friends who've been in electronics manufacturing, according to them the fact that anything works as reliably as they generally do is almost miraculous considering the very small margins of error in the build process.

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Back in the day I used to do component level repair on consumer electronic boards and I would replace chips, capacitors, resistors and such. Now it's much harder and impossible in some cases.

[KeviM]

Re: RICOH 2555 SC672

I've studied electronics, even built my own amplifiers, power supply units and other electronic equipment.

And I can honestly say that doing repairs to the controller and BCU boards found in the newer machines (6 years and newer) will require specialist skills and specialist equipment most of the time, just like what Slimslob said. I would not advise doing repairs yourself unless you are an absolute expert.

I also agree that controller boards are far more unreliable in the newer machines compared to the older 1s.