Lexicon PCM 90 Repair

[Joe Boerst]

Anybody have suggestions on where to send a PCM90 for repair?
Lexicon no longer supports them.
Looks like it is starting up but then blank display - no sound.
Thanks

[WillStG]

On Jun 12, 11:24*am, Joe Boerst > wrote:
> Anybody have suggestions on where to send a PCM90 for repair?
> Lexicon no longer supports them.
> Looks like it is starting up but then blank display - no sound.
> Thanks

I'd open it up an check for blown fuses and if the battery is ok
first, and try reinitializing to factory settings. Crappy power can
crash all electronics, including Lexicons and scramble the software.
Then were I desperate, well Lexicon recommends on the Lex 300 that you
try removing the eprom chip and short all of it's pins to ground, they
carefully reinsert it (with the right polarity). This should
reinitialize the machine, and when you send in a Lex 300 in for repair
that isn't working, they try that first. I think this also should work
for the PCM90, but you can always email Lexicon for advice first. If
you do that try shorting the eprom, be sure you don't destroy it with
static.

That said, if it's not passing audio I'd suspect the analog
outputs, which are probably fixable by a good tech. Could be as
simple as protective caps on the outputs, if say you patched it into
mic inputs with 48 volts active....

Will Miho
NY TV/Audio Post/Music/Live Sound Guy
"The large print giveth and the small print taketh away..." Tom Waits

[gtbuba]

On Jun 12, 12:29*pm, WillStG > wrote:
> On Jun 12, 11:24*am, Joe Boerst > wrote:
>
> > Anybody have suggestions on where to send a PCM90 for repair?
> > Lexicon no longer supports them.
> > Looks like it is starting up but then blank display - no sound.
> > Thanks
>
> * *I'd open it up an check for blown fuses and if the battery is ok
> first, and try reinitializing to factory settings. *Crappy power can
> crash all electronics, including Lexicons and scramble the software.
> Then were I desperate, well Lexicon recommends on the Lex 300 that you
> try removing the eprom chip and short all of it's pins to ground, they
> carefully reinsert it (with the right polarity). *This should
> reinitialize the machine, and when you send in a Lex 300 in for repair
> that isn't working, they try that first. I think this also should work
> for the PCM90, but you can always email Lexicon for advice first. *If
> you do that try shorting the eprom, be sure you don't destroy it with
> static.
>
> * *That said, if it's not passing audio I'd suspect the analog
> outputs, which are probably fixable by a good tech. *Could be as
> simple as protective caps on the outputs, if say you patched it into
> mic inputs with 48 volts active....
>
> Will Miho
> NY TV/Audio Post/Music/Live Sound Guy
> "The large print giveth and the small print taketh away..." Tom Waits

Jim Williams at Audio Upgrades in the San Diego area.