Casio CZ/VZ Files... part of CZsynth

Hi,

have you checked the relais, that grounds the output until the synth 
is fully operational, it's the weak spot of most CZ-1 and tends to 
cause output problems the way you described them.
Btw. this is the additional files area section, you might get more 
instant answers when joining....

http://launch.groups.yahoo.com/group/CZsynth/

Good luck!

...Summa


On 17 May 2009 at 0:35, acousmatique wrote:

> I have loved my CZ1000 but wanted a CZ1 for a long time. Finally I
> scored a "broken" one on ebay recently fot $75. Great deal even for
> just a controller. Why this CZ1 is making me crazy is that it does
> work normally except for a spurious output problem. If I strain to
> hear it in my headphones, I can hear the sound very faintly. So I
> tried loading loud patches, turning the volume up, and playing the
> keys hard - and sure enough the volume pops up and it sounds normal
> for a while. But after a while it starts to drop and then suddenly
> disappears. Another good way to hear it is to slide the chorus pot
> around, which makes enough of a pop to get things going.
> 
> Playing the synth while it is taken apart yields sound which flops
> around like an annoying broken cable. It seems obvious to me that
> this is probably an internal connection problem, but I haven't
> traced it yet. I started with the output board, I checked for lifted
> pads, cracked traces, and reflowed solder on the output jacks.
> Reassembled and the problem is still there. I took the whole thing
> apart (ugh..) and am now looking at the voice board (left PCB), it
> looks ok. I am beginning to suspect either the volume pot area or
> the flimsy interconnect cables.
> 
> Meanwhile, the CZ1 is getting a thorough bath and a checkup. I might
> replace some of the opamps with low-noise types, but haven't
> decided. This thing is such a tease!!!! It *almost* works perfectly,
> but then cuts out after a minute. It's like an annoying VST demo
> plugin. I love the sounds which I hear and would love to do some
> programming, but it will need to wait.
> 
> When (if?) I have solved the problem, I'll post the details here. 

-- 

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