It would seem that the 40 MHz oscillator; which is divided by 10 to get the 4
MHz clock, is bad/
I bought a bunch of these some time ago, new parts.
I offer them for $15 shipped in ACONUSA
Gary
W0DVN
Sent from my iPhone
> On Sep 4, 2019 , at 4:38 AM, John Hodge <john@hodge.uk.com> wrote:
>
> Got a 585 Paragon to repair, ex-SK friend of mine. Preliminary checks reveal
> no 4MHz clock or digital activity on the CPU on the Logic board. Supply
> voltages OK at 13v and 5v. Has anyone got a spare Logic board or can offer
> any advice? The clock on the ROM/RAM board is OK.
>
> Thanks,
>
> John G8CCD
>
>
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