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.
thanks for all your help in advance!
best regards, :-)
Bakis.
Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
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