100m info?

[Roy Tate]

At 02:03 PM 1/3/00, Philip wrote:
>Hi all,
>
>Just re-subscribed again...happy new year.  I finally got my first modular.
>It is a System 100m "D" package.
> ...

I ordered the service manual from Roland USA a few years ago.
I am the "guilty" party - I scanned the manual pages, and submitted
them to MM.  I'm sorry that folks haven't been able to get much value
from them.  If I get some time, I'll try to scan and "hand-scrub"
values if needed.

>Does anyone have access to the 100m schematics? Could they tell me the
>purpose of each trimmer pot? (see my data below)

>Here is what I gathered from the MM info (please correct mistakes and fill
>in 7):
>
>1. VCO1 Width
>2. VCO1 Hi-Freq Trim
>3. VCO1 Range Trim
>4. VCO1 Tune
>5. VCO1 Tri Peak Symmetry
>6. VCO1 Pulse 50% trim

7.  10 volt calibration trimmer. (5 K trimmer)
    This trimmer (properly called VR27), along with Zener 1S2453 and
    a 4558 dual opamp, generates +/-10V.  The actual 10V reference point
    is "above the opamp, where pin 2 connects to a 10K resistor then to
    a 4.7K resistor.

 Pin 2 -- 10K -- (10 volts here) -- 4.7K -- Pin 6

    +-[10K]---+
 [4558]       |
 [    ]     [4.7K] [4.7K] [820] [4.7K] [6.8K] [VR27]

(Use Courier Font if the lines don't match up!)

>8  VCO1 Pulse 10% trim
>9. VCO2 Pulse 10% trim
>10 VCO2 Range Trim
>11.VCO2 Width
>12.VCO2 Hi Freq Trim
>13.VCO2 Tune
>14.VCO2 Tri Peak Symmetry
>15.VCO2 Pulse 50% trim
>16. VCO2 Tune
>17. VCO1 Tune
>
>
>BIG THANKS!
>
>Philip Pilgrim

Roy Tate
roytate at ionet.net