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On Tue, 2/9/16, deanolium@... [xpantastic] <xpantastic@...> wrote:

Subject: [xpantastic] Weird Xpander Behaviour
To: xpantastic@...
Date: Tuesday, February 9, 2016, 4:46 AM


?









Hey there,
My xpander - which I
got last year - has started doing odd behaviour, and I just
want to float it past you guys to see if it is what I hope
it is; or if not, help to narrow it down.
I was using my
xpander yesterday, generating kick-ass sounds as normal.
Then after about 20 minutes, suddenly the patch name display
just filled up with asterisks. The sound engine still worked
- and I was able to continue editing my sound. I then went
to change the patch at which point the whole thing hung. No
sound being produced and the buttons did nothing. I then
rebooted it. The thing sprung to life as per normal but no
sound was coming out.
I then turned it off
and unplugged from mains and left it a while. A couple of
hours later I replugged it and turned it on. Booted up but
still no sound. After a hunch, I went into the voices page
only to find all the voices were set to off -- I turned them
on and the xpander was working as it
should.
Again, I played with
it for about 40 minutes (really addictive synth that it is),
and just as I was about to turn it all off, the displays
just went blank and the leds went on solidly. I power cycled
it, and this time it didn't boot - just stuck with the
leds on and no display.
I turned it off and
left it about a minute; rebooted and it displayed the
message of Resetting the Memory (patches won't be
effected). I pressed yes, only for it to again lock with all
the LEDs on and no display.
I again unplugged and
left it a couple of hours. Coming back, it again showed the
Reset the memory display, but this time it then booted.
After that, I turned it off and called it a
night.
I'm hoping this is a
battery issue -- it looks like it's using the original
batter!
y and surely that thing has to be dying by now. I opened it
up and the caps all look fine. Checking the battery voltage
(albeit in circuit), it's at 3.2v - which seems fine,
though that is not under load. Reading online, it looks like
when the battery dies, it can do all kinds of odd things to
the synth; though checking the schematics I'm not
totally sure of how this would affect the system once
it's booted (and has been running successfully for half
an hour or so).

I've
ordered a new battery and will check the voltages with the
system on later to see what's happening there (I might
as well scope it, so I can also check for ripple).
So does this sound like the likely
cause? The only other thing I can think of (beyond the
diodes around the battery and 5v line dying) is the psu
giving spikes or drop outs -- which I'm really hoping it
isn't. Mainly as the caps in those things can be pretty
nasty. However, it is a Japanese unit and they seem to be
known for having shitty PSUs. If it does end up being that
(ugh), would just replacing the electrolytics be fine, or
should I look at replacing the power supply entirely with a
more modern design?
Cheers,
deano










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