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Hiya,

Gotta couple old 520ST's I've inherited recently. One has a 2.5 meg upgrade (with 1989 c zubair on the pcb) and tec dos switcher board.. But this machine starts up, does a ram test then crashes with 4 bombs.

The second has a JRI ram expansion board (uses 4 simms) but is otherwise bone stock. This machine doesn't boot but does power up. I've checked and fixed any soldering breaks on both machines.

what I need is to get copies of the documentation for these upgrades so I can troubleshoot them properly. User manuals would be good, service manuals would be even better,

thanks
James
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 How to fix upgraded 520ST's` new James M. Alexander 03-28-2001 04:51 

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