Hi Tom,
It's worth bothering with if the keyboard is important to you.�
Certainly a lot more to check before declaring it a boat anchor.� I'm
not recalling during what years the VR-760 was produced.� Might it have
been during the badcaps era [around early 2000's]?� Kind of reminds me
of a problem that all Tascam CD RW-700's seem to have at some point,
which is capacitors going bad which results in the unit getting stuck
in the power up cycle [maybe once in a while making it through to
operation, before the caps get too bad].� How have you checked the PS?�
Analog circuits can work with PS problems, but with digital circuits
it's very unpredictable as to how PS problems will show up [clean DC
power is essential].� Get a scope on the PS if in doubt and see what
it's putting out, or at least look at it with a DMM set to read AC (not
DC) volts [I'm guessing out already checked the DC voltages].� Don't
rule out electrolytics on the logic boards going bad (assuming there
probably are some).� Many, many computers have ended up at the
scrappers when changing a few 50-cent caps [usually around the higher
temp CPU area] would have brought them back to life.
The other thing I'd be checking are any and all connections.� I've
again had various weird problems, and they came down to a connection
which had developed just a bit too much resistance.� Re-seating
connections and tightening and sometimes even getting into more drastic
measures with chemicals and scraping/filing/sanding can fix many
problems.� (Digital circuits "assume" working conditions in everything
they're communicating with.� They usually don't have enough memory for
the developers to build in diagnostics, and when the world isn't as
they expect it to be, the results are unpredictable.)
Best to ya,
---Kevin
noddyspuncture@... wrote:
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�
Hi guys,
Hope you all had a great Xmas... and here's wishing you all a
Happy New Year!
Also, I have a Roland VR-760 here. Very slow to boot up - gets
there eventually, but then the screen is all garbled.
I've checked the power supply output and all seems OK.
This is all surface mount stuff and seem to be custom IC's as
well. I suppose even Roland would have just replaced boards...!? But
it's all discontinued.
Anybody any ideas... or is it not worth bothering?
Cheers,
Tom