Hi Mazwreck,
Thanks very much for your quick reply. In the garage of my new place, I found:
* Cabinet as pictured
* 3x CPU/IO board sets (2x with multi-game ROMs, 1x with Blue Heelers ROM)
* Spare meter board
* Spare coin validator
Looks like the previous owner bought a few parts in an attempt to get it working, and ended up just leaving it behind. The three boards are basically doing the following:
* Multi-game board 1 - Originally showed 'logic seal error'. After a RAM clear, it got stuck at the config screen. Not acknowledging any input.
* Multi-game board 2 - Originally showed 'meter error'. After a RAM clear, it got stuck at the config screen. Not acknowledging any input.
* Blue Heelers board - Shows 'IO card error'. Tried a RAM clear but it didn't work. Not acknowledging any input.
It seems all the boards have basically the same issue. I did notice one pair of red/green LEDs on the CPU board is brighter than the other pair. Is that normal? Also on the I/O boards there is a flashing 'heartbeat' LED, and some of the other LEDs light up if I disconnect something important like the coin validator, so I guess they're error LEDs?
If you have some pointers as to where I should start to look, I'd really like to hear them. I've read a few of your older posts saying these machines are basically boat anchors, but I'd love to have a shot at fixing it rather than throwing it all away and converting it to a MAME box. Seems like it's a piece of Aussie history!
Thanks again.