Service manual

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Section XII: Modifications
93-113 Oscillator Assembly (Board 1)
To improve tracking and pitch stability on Mini-Moog oscillator boards with serial numbers
above 1300, make the following changes:
1. Change R-69, R-105, and R-141 from 6.8K to 15K 1/2 W 5% carbon
2. Replace R-78, R-106, and R-128 with RC Network, part number 65-032
3. Change R-181 from 56K to 51K 1/2 W 5% carbon
4. Change R-170 from 15K 5% to 15K 1% Metal Film
5. Change R-162 from 3K 5% to 3.01K 1% Metal Film
6. Change C-3, C-5, and C-7 from 47 pf to 100 pf
All parts listed above are available in kit form, part number 94-001.
93-114 Contour Generator Assembly (Board 2)
To reduce thumping which may occur when a key is depressed, add a 10 pF capacitor from pin
4B to pin 5B on the Contour Generator board.
93-115 Power Supply Assembly (Board 3)
To reduce oscillator bleed through and cross modulation, replace 10 ohm resistor next to the +10
V ADJ trimpot with a straight wire. Be sure wire does not touch the body of +10 V ADJ trimpot.
93-116 Filter Assembly (Board 4)
To reduce intermodulation distortion which occurs when mixing two or more signals:
1. Change R2 from 47K ohms to 160K ohms
2. Change R8 and R28 from 27 ohms to 4.7 ohms
3. Change R40 from 1K ohms to 10K ohms