wits end... pls help.
2004-03-26 by kirkdegiorgio
OK.
I've tried to solve this problem without involving any forum members
but I'm at my wits end and would appreciate advice.
My system comprises of 2 1999 build Oakland panels and 1 2001
Hartland panel. My problems are with Panel 1.
Panel 1 is as follows:
CVI-NTO-PCO-NOI-MIX2-ADSR-UAP
About 3 years ago my PCO started wavering in pitch. I immediately
emailed Rex and he immediately mailed me a replacement VCO board with
instructions for a tech to follow to replace.
I didn't ever get a tech to fit this because a few days later the PCO
started working 100% again. Then a few weeks later the problem
appeared again - and then disappeared, etc. Then a weird thing
started happening. If the PCO was stable, the NTO would become
unstable - displaying identical behaviour - wavering pitch from all
OUTPUTS. Then they would swap again - the NTO would be rock solid -
the PCO unstable. Now the NTO is stable 95% of the time and only
occasionally becomes unstable. The PCO is therefore almost always
unusable.
For the past 3 yrs - due to a heavy and continuous work schedule -
and the Serge being my primary sound source since I sold my Waldorf
Wave, I have had to make do without the PCO. I have another NTO and
PCO on Panel 3 so not too much of a loss - although annoying to know
I had a $3k panel that was faulty.
Then a few months back I heard some crackling as I played the Serge.
I checked all cables and tried different mixer/interface inputs, etc.
Still occasional crackles out of both UAP OUTS. This problem got
worse until it crackled continually and became unusable.
Again - due to work deadlines I found a workaround and used the top
section of Panel 2's wave Multiplier as my VCA. Interestingly - if I
fed audio into the UAP and turned the GAIN up to hear it continuously
it would not crackle - it was only if I turned down the GAIN and
opened the UAP using voltage from an ADSR or DSG that the crackles
would appear.
Then I needed to use the Portamento IN of my NTO's for a patch. The
NTO on Panel 1 had a dead PORTAMENTO IN. With so many problems I
decided to email Rex again. He replied immediately and asked me to
ship the Panel to CA where somebody would have a look at it. He also
asked for a US cheque for this "repair". The repair amount was
considerable and added to the cost of insured shipping came to an
amount I was reluctant to pay. I asked Rex to reconsider but no
reply - I hope I didn't offend him.
So, I sent the panel to a modular manufacturer here in the UK. He
couldn't get the NTO or PCO to waver in pitch. He couldn't get the
UAP to crackle. He did say however that the PORTAMENTO IN was simply
a wire which had become detached and was flapping around loose
inside. An easy fix. He also noticed the LED on the PS4 was
flickering and found another loose connection which he removed
(a "loose VDR from the transformer primary").
He also found the VARIABLE WAVE POT o the NTO had "intermittent
connectivity to the +12V power rail" and replaced the pot.
He also found that when tuning the NTO and PCO close together they
would lock on to each other 'soft sync' style - he put this down to
panel design.
He gave it the all-clear and returned it to me. I powered it up and
within 3 hours the PCO began wavering and the UAP crackling
continuously. You can imagine my frustration.
This time I made a 500 mile round trip and took the whole system to
him and luckily the problems started within an hour of Power Up. This
time the NTO was unstable - the PCO stable, but the UAP was crackling
intermittently and getting progressively worse as the system warmed
up.
We tried evrything - gently flexing the front panel - wiggling the
power cables - checking them for kinks or breaks, I even tried a
different Power Distribution Board which I had spare from Rex when I
had a 4th panel. The only way we could stop the NTO wavering was to
turn the Freq knob fully CCW and use the CV offset source from Panel
3's Dual Processor to control the Freq via the V/OCT socket. This
indicated a faulty pot. So we ordered replacement pots for the NTO
Freq. PCO Freq and UAP GAIN -I stayed overnight in a hotel and next
day the tech replaced the 3 pots and all seemed well.
I've had the system powered up for 18 hours now - no crackles from
the UAP but the PCO is wavering all over the place again.
Does anybody know what the hell is going on with my panel?
and pls - I just want practical advice on how to get this fixed - no
discussion about what the tech has done or Rex' attitude towards the
repair, etc. These things can get very personal and political and I'm
really not interested - I just want my Serge 100% again.
regards
KD
I've tried to solve this problem without involving any forum members
but I'm at my wits end and would appreciate advice.
My system comprises of 2 1999 build Oakland panels and 1 2001
Hartland panel. My problems are with Panel 1.
Panel 1 is as follows:
CVI-NTO-PCO-NOI-MIX2-ADSR-UAP
About 3 years ago my PCO started wavering in pitch. I immediately
emailed Rex and he immediately mailed me a replacement VCO board with
instructions for a tech to follow to replace.
I didn't ever get a tech to fit this because a few days later the PCO
started working 100% again. Then a few weeks later the problem
appeared again - and then disappeared, etc. Then a weird thing
started happening. If the PCO was stable, the NTO would become
unstable - displaying identical behaviour - wavering pitch from all
OUTPUTS. Then they would swap again - the NTO would be rock solid -
the PCO unstable. Now the NTO is stable 95% of the time and only
occasionally becomes unstable. The PCO is therefore almost always
unusable.
For the past 3 yrs - due to a heavy and continuous work schedule -
and the Serge being my primary sound source since I sold my Waldorf
Wave, I have had to make do without the PCO. I have another NTO and
PCO on Panel 3 so not too much of a loss - although annoying to know
I had a $3k panel that was faulty.
Then a few months back I heard some crackling as I played the Serge.
I checked all cables and tried different mixer/interface inputs, etc.
Still occasional crackles out of both UAP OUTS. This problem got
worse until it crackled continually and became unusable.
Again - due to work deadlines I found a workaround and used the top
section of Panel 2's wave Multiplier as my VCA. Interestingly - if I
fed audio into the UAP and turned the GAIN up to hear it continuously
it would not crackle - it was only if I turned down the GAIN and
opened the UAP using voltage from an ADSR or DSG that the crackles
would appear.
Then I needed to use the Portamento IN of my NTO's for a patch. The
NTO on Panel 1 had a dead PORTAMENTO IN. With so many problems I
decided to email Rex again. He replied immediately and asked me to
ship the Panel to CA where somebody would have a look at it. He also
asked for a US cheque for this "repair". The repair amount was
considerable and added to the cost of insured shipping came to an
amount I was reluctant to pay. I asked Rex to reconsider but no
reply - I hope I didn't offend him.
So, I sent the panel to a modular manufacturer here in the UK. He
couldn't get the NTO or PCO to waver in pitch. He couldn't get the
UAP to crackle. He did say however that the PORTAMENTO IN was simply
a wire which had become detached and was flapping around loose
inside. An easy fix. He also noticed the LED on the PS4 was
flickering and found another loose connection which he removed
(a "loose VDR from the transformer primary").
He also found the VARIABLE WAVE POT o the NTO had "intermittent
connectivity to the +12V power rail" and replaced the pot.
He also found that when tuning the NTO and PCO close together they
would lock on to each other 'soft sync' style - he put this down to
panel design.
He gave it the all-clear and returned it to me. I powered it up and
within 3 hours the PCO began wavering and the UAP crackling
continuously. You can imagine my frustration.
This time I made a 500 mile round trip and took the whole system to
him and luckily the problems started within an hour of Power Up. This
time the NTO was unstable - the PCO stable, but the UAP was crackling
intermittently and getting progressively worse as the system warmed
up.
We tried evrything - gently flexing the front panel - wiggling the
power cables - checking them for kinks or breaks, I even tried a
different Power Distribution Board which I had spare from Rex when I
had a 4th panel. The only way we could stop the NTO wavering was to
turn the Freq knob fully CCW and use the CV offset source from Panel
3's Dual Processor to control the Freq via the V/OCT socket. This
indicated a faulty pot. So we ordered replacement pots for the NTO
Freq. PCO Freq and UAP GAIN -I stayed overnight in a hotel and next
day the tech replaced the 3 pots and all seemed well.
I've had the system powered up for 18 hours now - no crackles from
the UAP but the PCO is wavering all over the place again.
Does anybody know what the hell is going on with my panel?
and pls - I just want practical advice on how to get this fixed - no
discussion about what the tech has done or Rex' attitude towards the
repair, etc. These things can get very personal and political and I'm
really not interested - I just want my Serge 100% again.
regards
KD