Fixing RiscPC

Arc/RPCs, peripherals, RISCOS operating system & ARM kit eg GP2x, BeagleBoard
Sanxion
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Fixing RiscPC

Postby Sanxion » Wed Aug 16, 2017 6:05 pm

Guys

I have attached a picture of the battery. Please advise, does it require changing?
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IMG_20170816_185655.jpg
Battery picture

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geraldholdsworth
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Re: Risc PC battery requires changing?

Postby geraldholdsworth » Wed Aug 16, 2017 6:17 pm

In short, yes.
Although there doesn't appear to be any sign of corrosion, I would change it anyway.
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danielj
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Re: Risc PC battery requires changing?

Postby danielj » Wed Aug 16, 2017 7:00 pm

There is definitely corrosion on the board there - green around the cmos chip, bubbling of tracks. Get the battery snipped off, wash the area with distilled vinegar, gently agitate with old toothbrush, then rinse it really well with water (tap if you're in a soft water area like Manchester, or distilled otherwise).

d.

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geraldholdsworth
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Re: Risc PC battery requires changing?

Postby geraldholdsworth » Wed Aug 16, 2017 7:11 pm

danielj wrote:There is definitely corrosion on the board there - green around the cmos chip, bubbling of tracks.

Well spotted - looks like I need glasses!!
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Sanxion
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Re: Risc PC battery requires changing?

Postby Sanxion » Wed Aug 16, 2017 8:23 pm

Thank-you all...I will. The job for the weekend.

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1024MAK
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Re: Risc PC battery requires changing?

Postby 1024MAK » Wed Aug 16, 2017 9:17 pm

Is the cell (battery) likely to be five or more years old? Yep, then it needs replacing even if it had not started leaking...

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Sanxion
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Re: Risc PC battery requires changing?

Postby Sanxion » Thu Aug 17, 2017 4:43 am

Could somebody please give a link to the replacement battery so I can order one?

Thanks

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geraldholdsworth
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Re: Risc PC battery requires changing?

Postby geraldholdsworth » Thu Aug 17, 2017 5:22 am

This is a direct replacement:
http://www.cjemicros.co.uk/micros/indiv ... BATPCBVRPC
while this one allows you to mount the battery away from the motherboard, plus is easily replaced later on:
http://www.cjemicros.co.uk/micros/indiv ... REMBATTAAA
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danielj
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Re: Risc PC battery requires changing?

Postby danielj » Thu Aug 17, 2017 5:33 am

It's a little cheaper if you source from elsewhere...
Direct replacement: http://cpc.farnell.com/varta/3-v150h/ba ... dp/BT00152

Off board option (safer) :
http://www.bapfish.org.uk/acorn/cmos.html

d.

Sanxion
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Re: Risc PC battery requires changing?

Postby Sanxion » Thu Aug 17, 2017 7:09 am

Thanks...I have ordered the parts.

:D

Sanxion
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Have I just ruined my RiscPC motherboard?

Postby Sanxion » Sat Aug 19, 2017 5:37 pm

Hi all

Today I 'removed' the old battery from my board and cleaned it...however, in the process of removing the battery, I pressed too hard with the soldering iron and burnt through one of the connection points...

Can I still solder a replacement battery to the remining two good points?

I have attached images.

:(
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IMG_20170819_181743.jpg
IMG_20170819_181706.jpg

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flibble
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Re: Have I just ruined my RiscPC motherboard?

Postby flibble » Sat Aug 19, 2017 5:59 pm

Yes, you lucked out by breaking a spare. Assuming there's not another break anywhere, the positive side has the 2 connectors and you could use either.

Sanxion
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Re: Have I just ruined my RiscPC motherboard?

Postby Sanxion » Sat Aug 19, 2017 6:11 pm

So I can still solder a positive and negative connection to the battery as normal and ignore the damaged one?

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flibble
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Re: Have I just ruined my RiscPC motherboard?

Postby flibble » Sat Aug 19, 2017 6:25 pm

Yep

Sanxion
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Re: Have I just ruined my RiscPC motherboard?

Postby Sanxion » Sat Aug 19, 2017 6:28 pm

Thanks...that's a relief... :P

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DutchAcorn
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Re: Have I just ruined my RiscPC motherboard?

Postby DutchAcorn » Sat Aug 19, 2017 7:02 pm

Note that the resistors as well as the tracks that are used by the battery circuit don't look good. If you have a multimeter it would be a good idea to check the tracks and resistors.

RPC600.JPG


Of course you could also just try putting in a new battery and see if it works. :D
Paul

Sanxion
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Re: Have I just ruined my RiscPC motherboard?

Postby Sanxion » Sun Aug 20, 2017 5:54 am

Thanks Paul.

The battery was working before I removed it and my soldering iron didn't go anywhere near those resistors!

Hopefully, swapping the battery should return the machine back to an operational state.

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Re: Have I just ruined my RiscPC motherboard?

Postby Paul » Mon Aug 21, 2017 6:30 am

Might be worth a vinegar then water toothbrush scrub in case of leakage..?

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vanpeebles
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Re: Have I just ruined my RiscPC motherboard?

Postby vanpeebles » Mon Aug 21, 2017 10:17 am

I always found those battery connectors really tough to unsolder. It's a lot easier just to clip the battery off with snips, and solder a replacement to the pins sticking out.

Sanxion
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Re: Have I just ruined my RiscPC motherboard?

Postby Sanxion » Mon Aug 21, 2017 4:21 pm

That was my initial plan...but I didn't have any pliers that would do the job so I decided to follow the desolder route - in my defence, I did use desolder braid!

Sanxion
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Display problem after "cleaning" the motherboard

Postby Sanxion » Mon Aug 21, 2017 4:29 pm

Hi all

As some of you will probably be aware, I recently removed the old battery from my RiscPC motherboard. I then cleaned the area around the battery using distilled vinegar as mentioned on this forum, followed by very hot water (with a touch of fairy for good measure).

I then left the board for about 30 hours to dry.

After reassembling the machine and turning it on, I was a touch disappointed to find the display was distorted. I have attached an image to illustrate. It ia not a monitor problem as I have tried it with another machine and it is fine.

Guys - is there any hope here? Does it require longer to dry out? Will the distortion fade over time - or have I ruined my RiscPC without ever seeing Arch Elite in action, not to mention Zarch...
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IMG_20170821_171757.jpg

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danielj
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Re: Display problem after "cleaning" the motherboard

Postby danielj » Mon Aug 21, 2017 5:43 pm

Did you get water in the vram socket? Take all the ram out, let it dry a bit more, clean all the ram contacts with isopropanol. I'm going to combine all of your "fixing the riscpc" posts into a single topic - it'll be a bit tidier to keep it all in one place! :D

d.

Sanxion
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Re: Display problem after "cleaning" the motherboard

Postby Sanxion » Mon Aug 21, 2017 5:48 pm

Yes I did get water in there.

Fine, I will take out all the RAM and let it dry some more and clean with isopropanol.

Good idea to collect all the posts together...this may turn into a novel...or perhaps an epic.

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danielj
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Re: Fixing RiscPC

Postby danielj » Mon Aug 21, 2017 5:51 pm

On a positive note, it's basically working! Just looks like something's not quite connecting nicely. Once dried out, try it without the vram in first.

d.

Sanxion
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Re: Fixing RiscPC

Postby Sanxion » Mon Aug 21, 2017 6:06 pm

Yes...I am hoping it is a minor issue.

Also, I really appreciate all the help and advice I have received here so far. You guys are great!

Sanxion
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Re: Fixing RiscPC

Postby Sanxion » Mon Aug 21, 2017 7:41 pm

I removed the VRAM and noticed a small amount of corrosion on one of the pins...I therefore removed it, popped it back into the slot, turned the machine on and...it has returned to its former glorious self!

Thank-you all...now onto the next task...ArcElite 8)
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IMG_20170821_203801.jpg

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1024MAK
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Re: Fixing RiscPC

Postby 1024MAK » Mon Aug 21, 2017 8:19 pm

See, all it needed was a little TLC :P

Mark
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