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What about the DAC Mono test (pass or fail)?? I will guess that you can probably fix this by recapping the power supply board.? When I got my Xpander I had issues with the tuning tests and it being terribly out of tune and a recap fixed it.?

Chase

Tony Cappellini wrote:

Have you tried the DAC Mono test in the service Page ?. If you get a
bleep , can you count period between the bleeps . Do you get no
bleeps or an almost constant tone ?. If you get no bleeps , it may be
the PSU , new caps , diodes etc. Fingers crossed it's not the DAC!

Phil.




--- In xpantastic@..., "Tony Cappellini" <cappy2112@...>
wrote:

It looks like I won't need to do an A/B comparison with Jeremy's

wave file,

I can easily hear now that my Xpander is not working well.

Prior to this and the reason I had posted a message looking for

someone

local to the SF Bay Area was that only on 1 patch did my Xpander

sound very

bad.

I had found one voice which was flaky, so I turned it off.

Recently, I happen to hit several keys at once and could hear the

vcos being

grossly out of tune.

After trying to tune everything, I get FAIL across the board.

In the past, when I would see FAIL after running autotune, I would

wait 30

min, run it again and all tests would pass. This is not the case

now.

Fortunately, I've got a few spare CEMs which I hope are all

working, that I

can use to troubleshoot with.

I haven't looked at the service manual in years- I hope there are

some

measurements I can make with a voltmeter to give me some ideas.

I can probably borrow a scope to check for ripple on the output of

the PS

but don't really know how much ripple would be excessive for the XP

PS.

All other front panel functions & midi appear to be working

normally, so

it's probably not likely to be a PS issue.

Tony Cappellini wrote:

I don''t think so.
If this isn't on the autotune page, then I didnt do it.

When I first got my Xpander, it wouldn't tune.

In my country (England) the mains voltage is 240v. My Xpander was set to 110v so I bought an adapter, not knowing the Xpander has a 110/240v switch.

On the American voltage, it tuned perfectly, and since then it's been pretty much silent running.

I'm not sure if it'd work by going from 110v to 240v, but it shows how temperamental the Xpander is.

I hope you find the problem!

Jeremy

Hi Tony,

Don't Fret, we will try to get him happy again. I have been helping
Phillip (member) off post with almost the same problems. If you
want to keep these long threads off the group feel free to send
direct emails.

OK, First off, the power supply has several outputs: A set for the
digital and display. And a analog set. So in theory the PS could be
causing the problems. You can check these with a voltmeter easy
enough. But a scope would be needeed to check ripple. BTW if you do
not have a 60 Hz-buzz on the audio output then the power supply is
probobly not the issue.

Out of tune Points to the DAC, pray it's is not failed because it's
even harder to find than the CEMs.
Can you tell if the filter still sweeps well? Or - Turn off the VCO
waves and turn the resonace all the way up,and the cutoff all the way
down, Mod by keyboard to see if you can play the filter like a voice.
Once we know if it's the DAC or
not we can go from there.

Note: These guys are getting 20+ years old, this points to Bad Caps
and old bad solder joints. It can probobly be fixed with more love
than
money.

Keep Me Posted

Karl



--- In xpantastic@..., "Tony Cappellini" <cappy2112@...>
wrote:

It looks like I won't need to do an A/B comparison with Jeremy's

wave file,

I can easily hear now that my Xpander is not working well.

Prior to this and the reason I had posted a message looking for

someone

local to the SF Bay Area was that only on 1 patch did my Xpander

sound very

bad.

I had found one voice which was flaky, so I turned it off.

Recently, I happen to hit several keys at once and could hear the

vcos being

grossly out of tune.

After trying to tune everything, I get FAIL across the board.

In the past, when I would see FAIL after running autotune, I would

wait 30

min, run it again and all tests would pass. This is not the case

now.

Fortunately, I've got a few spare CEMs which I hope are all

working, that I

can use to troubleshoot with.

I haven't looked at the service manual in years- I hope there are

some

measurements I can make with a voltmeter to give me some ideas.

I can probably borrow a scope to check for ripple on the output of

the PS

but don't really know how much ripple would be excessive for the XP

PS.

All other front panel functions & midi appear to be working

normally, so

it's probably not likely to be a PS issue.