Moog Minimoog Manual de Serviço descarregar pdf (Página 12)

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ADJUSTMENT PROCEDURES

NOTE:

The tuning and other functions rely heavily on accurate power supply voltages.

Always be sure the + and - 10 volt supplies are properly set before making other adjustments.

* Digital voltmeter with 0.1% accuracy

TO ADJUST . . . FOLLOW THIS PROCEDURE . . .

+10 volts Connect an accurate D.C. voltmeter* to pins 1A and 2A on the

oscillator (board 1). Adjust the +10 volt trimpot on the power

supply (board 3) for +10.00 volts.

-10 volts Connect an accurate D.C. voltmeter* to pins 2A and 3A on the

oscillator (board 1). Adjust the -10 volt trimpot on the power

supply (board 3) for -10.00 volts.

A-440 Ref. Oscillator Turn on A-440 and allow to warm up for two minutes. Adjust

A-440 trim-pot on the filter (board 4) for zero beat with an "A"

tuning fork. By bringing the struck tuning fork in physical contact

with the shell of a pair of headphones, while listening to the A-440

output, the beat note becomes more audible.

Oscillator Tuning

(With Equipment)

Connect a frequency counter to the High Main Output jack.

Set the PITCH WHEEL to center, TUNE control to 0, RANGE

switches to 2 ft., WAVE-FORM switches to SAWTOOTH.

Set MIXER VOLUME controls to 4, turn OSCILLATOR

MODULATION switch off, and OSCILLATOR 3 CONTROL

switch on. Set Oscillator 2 and 3 FREQUENCY controls to mid-

position. Turn on OSCILLATOR 1 mixer switch. Adjust

Oscillator 1 Range Trimpot

for 3520 Hz while holding high "A"

key down. Depress low "A" and hold while adjusting Oscillator 1

Scale Trimpot for 440 Hz. Repeat until no further improvement is

attainable. Turn off OSCILLATOR 1 Mixer switch. Turn on

OSCILLATOR 2 and repeat the procedure -- then OSCILLATOR

3. Finally, check tracking between any two oscillators and make

any necessary touch-up adjustments to improve tracking.

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Moog Minimoog Manual de Serviço Página 12