RiscPC600:battery leak

Arc/RPCs, peripherals, RISCOS operating system & ARM kit eg GP2x, BeagleBoard
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jvernet
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RiscPC600:battery leak

Post by jvernet » Sat Oct 06, 2018 4:31 pm

Here is what my RiscPC600 mother board look like:
IMG_1027.jpg
Removed the battery this afternoon. Already saw the tips with battery holder and 1.5V NiCD AAA bartery, for later.
I will buy tomorrow a bottle of distilled water. Vinegar, toothbrush tomorrow. Some say that they use bicarbonate after vinegar, usefull ?

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danielj
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Re: RiscPC600:battery leak

Post by danielj » Sat Oct 06, 2018 4:44 pm

No need to use bicarb after the vinegar, just rinse it off well with water, and give it a final rinse with distilled water. If your local water is very soft (douce?) then you can probably get away without needing distilled water. We've had them working again when they've been in worse condition than that, and as it's a 600 we do have reasonable schematics for it! :)


d.

jvernet
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Re: RiscPC600:battery leak

Post by jvernet » Sat Oct 06, 2018 5:10 pm

Thanks for the advice.

Water is very hard here (white traces everywhere.... so that's why I have white vinegar !).

Will try tomorrow. Is there any risk of bad PSU (too high voltage) ?

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danielj
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Re: RiscPC600:battery leak

Post by danielj » Sat Oct 06, 2018 5:30 pm

I've not personally heard of an over-voltage PSU, others may have?

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Re: RiscPC600:battery leak

Post by jvernet » Sat Oct 13, 2018 4:15 pm

I've cleaned as much as i can the motherboard. Looks correct nothing went with the toothbrush.
Changed to RAM for a good pair of 4Mb taken from an old Mac.

So I tried to power it. Nothing burned, Power LED up, fan up. I can hear the Hard Disk spinning and the HD LED flashing at power on. But nothing else... No noise, LCD screen remain in low power mode.
The only thing I get is that the LED of the disk drive blink, like a code (3 short, 1 long, repeated).

Is there anything I can do/check first ? Tried the R key or Delete key at power on, nothing.

I can exchange the CPU card from the R700, wich is working.

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Re: RiscPC600:battery leak

Post by jvernet » Sat Oct 13, 2018 5:41 pm

jvernet wrote:
Sat Oct 13, 2018 4:15 pm

The only thing I get is that the LED of the disk drive blink, like a code (3 short, 1 long, repeated).
Ok, it's a POST CODE. Funny. Never seen the use of the Floppy LED in any other computer to display POST error Codes.

As I do not have any video, it may be related to video. Will make a movie of the blinking LED, as 3 short/1 long as I think I 've seen doesn't make sense.

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danielj
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Re: RiscPC600:battery leak

Post by danielj » Sat Oct 13, 2018 5:46 pm


jvernet
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Re: RiscPC600:battery leak

Post by jvernet » Sun Oct 14, 2018 10:19 am

Thanks for the link

Here is what my R600 give:

Fault code:
0001C019
CMOS unreadable
VIDC Sirq (Sound Interrupt) timing failed
VIDC Virq (Video Interrupt) timing failed

ARM 3 fitted/ARM ID read and not ARM2
Long memory test performed
Self-test due to power-on

So what can i do now?
Last edited by jvernet on Sun Oct 14, 2018 10:21 am, edited 1 time in total.

VincentVega
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Re: RiscPC600:battery leak

Post by VincentVega » Sun Oct 14, 2018 10:46 am

There's a useful guide for decoding RISC PC POST error codes here:

https://retrocomputing.stackexchange.co ... boot-error

I'd download the technical drawings - http://chrisacorns.computinghistory.org ... awings.zip - and use a multimeter to check the CMOS RAM circuit. The 8-pin chip in your photo between the battery and the connectors for the speaker and LEDs is the CMOS chip (an 8583T) and looking at your image, it does look rather dirty, though it may just be dust. There could be some damage to the tracks that's not immediately obvious.

jvernet
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Re: RiscPC600:battery leak

Post by jvernet » Sun Oct 14, 2018 3:30 pm

Looks like there is a short between those 2 pins of the 8583T (Pin 3 and 4, VSS and A0). Don't think it's normal, but cannot see where it come from...
IMG_1241.jpg

jvernet
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Re: RiscPC600:battery leak

Post by jvernet » Sun Oct 14, 2018 7:25 pm

Hum. According to technical doc, 3 and 4 are grounded, so it's normal....

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DutchAcorn
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Re: RiscPC600:battery leak

Post by DutchAcorn » Sun Oct 14, 2018 7:54 pm

You could have a read through this thread: viewtopic.php?f=16&t=12527

It may help / inspire.
Paul

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danielj
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Re: RiscPC600:battery leak

Post by danielj » Mon Oct 15, 2018 8:33 am

So, the CMOS IC could be dead, that's quite common after it's been pickled. The other bits that go are the fine tracks around the resistor packs/logic ICS next to the SIMM sockets - check those circuits too, and the connections back to the VIDC20.

d.

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