Hello Bakis,
The other posters have it right. You should replace?the coupling caps.
Specifically I would replace?C549??on voice 5.?
This?part fails often, and causes tuning fails.??BTW It must have the 50VDC
rating or it won't work.
Actually I would change all Cx49 parts (x = voice number), because?it sounds as
if Voice 1 may have?this problem also.
However, this does not address the bleedthrough problem you mention on the
direct out of voice 5.
I?have an M12 so I have no direct outs, and?can't really comment on this.??
Best Luck
Karl
________________________________
From: Bakis Sirros <
synth_freak_2000@...>
To: Xpantastic group <
xpantastic@...>
Sent: Fri, January 27, 2012 2:30:18 PM
Subject: [xpantastic] hello everyone, Xpander problem, help is needed...
?
hi everyone,
new member here, my Name is Bakis.
recently bought an Xpander and have the following problem:
works and sounds great...? ...apart from voice 5, which, after its shipping to
me, does not pass the auto tune test.
?
sometimes the 'PW' section of it fails, sometimes the Res section fails,
sometimes all the sections of voice 5?fail (except the vca section of voice 5
that never fails).
?
even if i activate the problematic voice, after its been automatically shut off
by the Xpander OS, it sounds a bit different from the others in filter tone and
tuning (of course, as it cannot be tuned,) and very very low in volume.
another weird thing i noticed: when i direct voice 5 in its 'direct' output 5,
then, from this output, i can hear all of the xpander voices (together with
voice 5) but very low in volume.
all the other direct outputs work as they should, for all the other voices.
?
i performed software reset, re-sitted all ribbon cables and all of the chips in
the voice 5 section of the xpander voiceboard without success,
i also performed all the tests for the xpander (memory, vmemory, etc...) and all
are ok, afaik.
plus i re-sitted chip U106 which is responsible for the panning output section
of voice 5 (after studying the service manual).
also, i swapped both CEM3374 and CEM3372 of voice 5 with another working voice
chips (voice 6) and still the fault appears on voice 5. so, both the CEM chips
are Not the problem...
and i swapped ALL of the chips of voice 5 with the chips of voice 6 and still
the same problem appears on voice 5.
so ALL the chips in the voice 5 section are ok for sure.
and, after hitting tuning many many times and hitting tuning while the machine
was at various different presets, i noticed that thing:
when the machine was autotuning and it was in a preset that was very complex
with lots of modulations and vco modulation as well, then?voice 5 failed in the
vco tuning as well, (and, at one time, vco 1 failed!).
when the machine was autotuning, while it was in a simpler sound preset (some
brass or synthlead...), then?the voice 5 only failed in PWM and maybe Res... but
it passed vco tuning....!!
so maybe its a problem in another board of the machine (like the CPU) and not in
the voice 5 board ?
?
maybe this indicates that i should re-sit the chips in the main CPU /memory
board as well?? do you think i should take the time and re-sit all the chips in
the CPU board? would it make sense?
?
(do you think a 'HARD Reset' may fix the problem? how do i do this?)
is there anything specific i should check? everything seems connected.... i
cannot resit ALL the chips in all boards obviously... but maybe i should resit a
specific chip from another section of the xpander boards....? any ideas / help?
?
i really do not want to break anything inside the Xpander (i do not want to use
a soldering iron, after all, everything seems in place), but i can remove and
easily re-sit a specific chip or two, if needed of course....
?
btw, the seller is very honest and he insisted that the machine worked fine?(all
6 voices) before shipping, and i believe him..
thanks for all your help in advance!
best regards,????? :-)
Bakis.
Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. facebook. com/ pages/Parallel-Worlds/192093934136476
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist www. DiN. org. uk www. musicamaximamagnetica. com
www. vu-us. com
