Mono/Poly VCO heater (was: beating a dead DAC )

[Osamu Hoshuyama]

Hi, Russ and JH,

> Date:    Mon, 17 Jan 2000 21:51:25 EST
> From:    Russ L <askeyman at earthlink.net>
>
> JH,
> 
> Thanks for the in-depth report. In my Mono/Poly, there is a small
> probably 1/8W or 1/4W resistor on top of each SSM2033 with
> some thermal compound. I haven't opened the synth again, but
> I read through the datasheet, and there is a little footnote about
> temperature drift being 3300ppm without that part of the loop.
> I couldn't find a tempco in the parts list, but they do specify
> a thermistor for the filter compensation. If I open it again I'll
> measure the resistor on the 2033. My schematic is more-or-less
> unreadable. I don't remember any external high-wattage resistors
> that Osamu mentioned. At least not in my Mo/Po.

Again, I opened my Mono/Poly last night.
The resistor (not resister ;-) I can see is attached on the top of the
ceramic chip with orange paint.  It is quite larger than other
resistors.  I guess the wattage is 1/2W or 1W.

Anyway, are there schematics of Mono/Poly on the net?
Actually, my Mono/Poly's digital part is out of order.
I'd like to try to fix it in the near future.

- -- ---- ----------- --- --- - ----- -- --- --- - - ------ - - - --
 Osamu HOSHUYAMA          Digital Signal Processing Technology Group
                    C&C Media Research Laboratories, NEC Corporation
               Email: houshu at ccm.CL.nec.co.jp,  Fax: +81-44-856-2232
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