Atari PC4 - 4 beeps at boot-up

[krap]

Hi,

 

I'm trying to reanimate a REV 1.0 PC4, motherboard C103524-001, and I'm getting 4 beeps on the boot up, no video at all.

The motherboard is clean, however the case has some acid stains, so I expect there was a battery problem here some time ago.

J35 is not connected to anything.

 

I've browsed through the French manual that is available online, but no information on further debugging than the 4 beeps mean real time clock problem.

I've tried to connect CR2032 to J35, with no success though.

 

Do you have any more detailed reference on the motherboard and the jumpers/pinout?

What kind of battery should be connected and to what pins exactly?

Any ideas on how to proceed further?

 

[zzip]

If you know what BIOS it uses (I don't offhand) you could potentially look up the POST beep codes for that BIOS.   It's more likely BIOS specific than Atari specific

[krap]

Yes, I've checked in the manual. It is 'clock error'. But I guess even with the battery it should proceed. Maybe?

[edintv]

Have you inspected the Bios chip itself? some old ones they just have the battery soldered to the chip and caused a mess.

[krap]

Problem solved - it was the oscillator siting under the power supply.

The seating was loose and at least one leg was not having contact. After reseating it started ok.