[sdiy] P600 - no workee

[Doug Terrebonne]

You might try replacing the EPROM socket. The originals were cheap and known to fail. Get a machined one if you can. Also try another EPROM if you have one.

Doug

--- On Sat, 11/21/09, Hermitage Heart <hermitageheart at gmail.com> wrote:

> From: Hermitage Heart <hermitageheart at gmail.com>
> Subject: [sdiy] P600 - no workee
> To: synth-diy at dropmix.xs4all.nl
> Date: Saturday, November 21, 2009, 3:53 PM
> Greetings all,  harken unto my
> tale of woe.
> 
> So I decided to clean the key contacts on my P600 and while
> I had it opened, to upgrade the eprom w an ROM image found
> online.
> Cleaning the keys pretty much is a no-brainer. I've done
> this many times over the years with various poly-sixes,
> etc.
> I'm newish to the prom burning thing, but here's what I
> did:
> 
> I backed up the old eprom (6.0.5)
> blanked the chip (UV erased)
> verified the ERASE
> burned the new ROM (6.0.8)
> verified the BURN
> installed the chip
> installed keybed, reassembled. power on:
> 
> no LEDs, no sound, no magic smoke.
> 
> I've checked power to the boards  +15/-15/+5 where you
> would expect them
> I've wiggled /reseated connectors all with no luck.
> checked for bent pins on the eprom, & double checked
> that the chip was correctly oriented.
> 
> I even re-blanked and re-burned the old ROM version - still
> nothing.
> I would kinda expect that even with a bad ROM (or maybe
> even without an OS chip) that there would still be and LED
> or two lit.
> 
> suggestions on how to proceed from here?
> 
> thanks in advance for your advice.
> 
> HH
> 
> 
> 
> 
> 
> 
> 
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