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<p>Hello Al,</p>
<p>I don't have an Oberheim calibration procedure but I can share
the way I calibrate the key assigner and the programmer overhead
board. The numbers of the trimmers might not correspond with the
Oberheim numbers. <br>
<br>
Keyboard assigner<br>
</p>
<p style="margin-bottom: 0cm">
<i>Keyboard Assigner</i></p>
<p style="margin-bottom: 0cm">Use
T3 to obtain + and – the same voltage. (Balance) Single turn
trimpot<br>
Set
keyboard assigner to unison, no split, portamento off.<br>
Connect
voltage meter to CV out channel 4 on backside. Measure offset when
lowest C(C1) key
is pressed. Adjust T2 for exactly 4.000V difference between lowest
C
and highest C(C5). Verify
keyboard voltage for C2, C3 and C4. Measure the voltage between
Connector L1 en L2 . Adjust T1 for exactly 1.000V
differencebetween
octave switch centered and octave switch up. Verify down is
-1.000V
difference.<br>
Portamento,
check if all voices have the same portamento time when portamento
is
at max. Trimmers are located on the polyphonic keyb channel logic
board
(1103D). <font face="Bahnschrift, sans-serif"><br>
</font></p>
<p style="margin-bottom: 0cm">
<i>Programmer overhead board</i></p>
<p style="margin-bottom: 0cm; font-style: normal">Adjust
T1 for +15.000 Volt on connector T5 and T6. <br>
Adjust
T2 for 10uS A11 pin 13.<br>
Adjust
T3 for 10.000V on N1 (My notes also mention 10.350Volts, I am not
sure about this)<br>
</p>
<p style="margin-bottom: 0cm; font-style: normal">Best regards,<br>
Maarten<br>
</p>
<p style="margin-bottom: 0cm"><font face="Bahnschrift, sans-serif"><br>
</font></p>
<div class="moz-cite-prefix">Op 18-3-2025 om 01:21 schreef al
spitzley via Synth-diy:<br>
</div>
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Hello all,
<div>I’m trying to calibrate an 8 voice and want to make sure I’m
doing it in the correct order. My main issue is when/how exactly
the programmer DAC should be calibrated. I’ve been doing the
sems then tuning the programmer boards to each other but I’m not
sure if this is the correct order to do it. I have not found any
instructions on the web for the programmer or the assigner
boards. </div>
<div>Any help greatly appreciated!</div>
<div>Thanks</div>
<div>Al<br>
<br>
<br>
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