Crumar Musical Instruments User Group.

hello-

I just picked up a Crumar OTR keyboard. I don't know anything about 
it, but the price was right. It makes no noise at all, but the power 
light comes on! anybody have any suggestions, or schematics?

Thanks for your help!

floyd

Also known as an Orchestrator?

--- In crumar@yahoogroups.com, "Floyd Smoot" <tubetater@y...> wrote:
> hello-
> 
> I just picked up a Crumar OTR keyboard. I don't know anything about 
> it, but the price was right. It makes no noise at all, but the 
power 

> light comes on! anybody have any suggestions, or schematics?
> 
> Thanks for your help!
> 
> floyd

This place is pretty dead!

I fixed the original problem with the synth, and it worked for about 
two days. Then the C note went out, all 5 octaves. Any suggestions 
about what might be wrong?

Thanks-
floyd
--- In crumar@yahoogroups.com, "Floyd Smoot" <tubetater@y...> wrote:
> Also known as an Orchestrator?
> 
> --- In crumar@yahoogroups.com, "Floyd Smoot" <tubetater@y...> wrote:
> > hello-
> > 
> > I just picked up a Crumar OTR keyboard. I don't know anything 
about 

> > it, but the price was right. It makes no noise at all, but the 
> power 
> > light comes on! anybody have any suggestions, or schematics?
> > 
> > Thanks for your help!
> > 
> > floyd

you are exactly right, margus! In my Orchestrator the chip is a 4727, 
which i think is a cmos counter. Any idea where I can buy one? I have 
struck out so far.

funny thing is I only see 10 of those chips- seems like there should 
be 12.

Thanks for your help!

floyd--- In crumar@yahoogroups.com, "Margus Kliimask" 
<margus.kliimask@m...> wrote:
> I don't know about OTR keyboard (does this stand for Orchestrator? 
which is
> actually Multiman) but in these 'organ-style' keyboards the sound is
> generated by TOS (Top Octave Synthesizer chip which generates all 
12 base
> frequencies) which are then divided down by divider chips for lower 
octaves,
> one for each note (12 altogether). In my Performer this divider 
chip is
> TDA1008, I bet one of your dividers is either dead or 
malfunctioning. You
> can try swapping the C note divider (should be the first one from 
left) with

> another one and see if the dead note moves to another note.
> 
> Cheers,
> Margus
> Service.

Good idea Margus. I was thinking of doing something like that. I 
suppose the pins will be different. I was thinking of making a small 
wire-wrap board with the other chip and an empty 14-pin socket that 
would plug into the empty 4727 socket. Is that what you are thinking?

But I still think someone must have some of those chips sitting in a 
dusty old bin somewhere, or in a deceased crumar keyboard!

floyd--- In crumar@yahoogroups.com, "Margus Kliimask" 
<margus.kliimask@m...> wrote:
> Sorry, no idea. Maybe you can find a substitute, a counter should 
be quite a
> trivial thing. For example, ARP Omni uses 4520 (which is also 
CMOS), they
> should be readily available. As to why there's only ten of them, I 
have no
> clue. Check again, you should have two more :)
> 
> Regards,
> 
> -----Original Message-----
> From: Floyd Smoot [mailto:tubetater@y...]
> Sent: 29. October, 2003 01:50
> To: crumar@yahoogroups.com
> Subject: [crumar] Re: New Owner of an OTR/Orchestrator
> 
> 
> you are exactly right, margus! In my Orchestrator the chip is a 
4727,
> which i think is a cmos counter. Any idea where I can buy one? I 
have
> struck out so far.
> 
> funny thing is I only see 10 of those chips- seems like there should
> be 12.
> 
> Thanks for your help!
> 
> floyd--- In crumar@yahoogroups.com, "Margus Kliimask"
> <margus.kliimask@m...> wrote:
> > I don't know about OTR keyboard (does this stand for Orchestrator?
> which is
> > actually Multiman) but in these 'organ-style' keyboards the sound 
is
> > generated by TOS (Top Octave Synthesizer chip which generates all
> 12 base
> > frequencies) which are then divided down by divider chips for 
lower

> octaves,
> > one for each note (12 altogether). In my Performer this divider
> chip is
> > TDA1008, I bet one of your dividers is either dead or
> malfunctioning. You
> > can try swapping the C note divider (should be the first one from
> left) with
> > another one and see if the dead note moves to another note.
> >
> > Cheers,
> > Margus
> > Service.
> 
> 
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