Sequential circuits samplers

From: Rob Miller
Subject: Re: [prophet2000] Re: Nothing but "nd"
To: prophet2000@yahoogroups.com
Date: Tuesday, October 13, 2009, 3:03 AM

Well, I might be making some progress. There's a "buffer" chip, a 7406,
that's identified as U201. It sits between the floppy controller and
the header P202. On two of the hex inverted pairs they don't seem to
be inverting the signals. Namely, pins 1/2 and 3/4.

Does anyone have a clean copy of the schematics? I'm having a hard
time ready what each of the pins do on the online version. This is
on what appears to be drawing SD 2000-2.

This is a very inexpensive part, so I might just pull it, socket
a new one, and try.

Rob

Henrik wrote:
> Same problem here too.
>
> --- On Thu, 10/8/09, j. aaron <tomkah@yahoo. com> wrote:
>
> From: j. aaron <tomkah@yahoo. com>
> Subject: Re: [prophet2000] Re: Nothing but "nd"
> To: prophet2000@ yahoogroups. com
> Date: Thursday, October 8, 2009, 10:51 PM
>
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>
> ive experienced this same problem
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> the original 2002 drive died, so i picked up a suitable replacement on ebay
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> making sure the jumpers were correctly aligned
>
> same thing, ...drive powers up, disc takes a spin and then 'nd'
>
> since that drive only cost me $10, i decided id try buying another
>
> suitable replacement off ebay (different model than the first), that i also jumper configured correctly and got the the same result ...'nd'
>
> i tried switching things around a bit but sort of gave up on it at that point
>
> im still over $40 ahead of the $70 whine country wanted for a new one,
>
> so i figured eventually ill try getting another one off ebay sometime
>
> and repeat the process, but i really couldnt find a reason why those drives werent functioning
>
> this discussion has rekindled my interest in getting my 2002 going again
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> i put a ton of work into sampling back in the late 80's/early 90's
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> and id like to revisit some of those sounds
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> ...heres hoping help arrives!
>
> -yeller
>
>
>
> --- On Thu, 10/8/09, Rob Miller wrote:
>
>
>
>> From: Rob Miller
>
>>; Subject: Re: [prophet2000] Re: Nothing but "nd"
>
>> To: prophet2000@ yahoogroups. com
>
>> Date: Thursday, October 8, 2009, 12:06 PM
>
>> I didn't change the jumper on the
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>> factory drive that selects DS0, and
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>> the replacement from WC doesn't have any. The power
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>> cord has to flip
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>> between the stock and the replacement (and the
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>> replacement instructions
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>> indicate so). I have flipped back and forth the data
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>> cable, since there
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>> is no real keying to it.
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>> I hope it's not the driver chip. I can replace
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>> it, but it should would
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>> be easier not to. The drive spins up on power up, but
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>> doesn't seem to
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>> seek when I try to move data to/from it.
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>> I'll keep poking around and see if I can get the right
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>> combo working
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>> now. I appreciate the forum's help!
>
>> Rob
>
>
>> duncan wrote:
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>>>; have you got the jumpers in the right place on the
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>> drives? I hope when you say "flipped" you don't mean
>
>>; "reversed".. .. I killed a floppy drive doing this by
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>> accident.
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>>> the floppy disc driver chip is fairly standard, I
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>> think, but would be a tricky job to replace....
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>>> I have the boards from my 2000, which had a dead
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>> keyboard controller (which WC couldn't help with- it was a
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>> custom IC)... let me see if I can locate anything useful on
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>> them for you, & let me know how you get on. I have to
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>> strip some bits off them for another forum member whose
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>> patience must be running out by now.... :-/ I've been a bit
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>> busy this year....
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>
>>> --- In prophet2000@ yahoogroups. com,
>
>> Rob Miller wrote:
>
>>>> I'm hoping I can get some help here....
>
>
>>>> My 2000 is now running 4.3b with a brand new
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>> drive...but it STILL
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>>>> gives me "nd" (no disk) whenever I try to do
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>> anything with the
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>>>> drive. I can't read factory disks on power
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>> up, nor can I load
>;
>>>> single sounds, and I can't format a disk. I
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>> get the same "nd"
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>>>> every time.
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>>>> I've flipped the drive cable, and now have two
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>> drives (original
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>>>> and WineCountry new one) and they perform the
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>;> same.
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>
>>>> Rob
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>> ------------ --------- --------- ------
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>> Yahoo! Groups Links
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>> mailto:prophet2000- fullfeatured@ yahoogroups. com
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