User manual MOOG MINIMOOG MODEL D TECHNICAL SERVICE MANUAL

[. . . ] Folkman ¤ ¨ ¤ ¢ ¦ ¨ $ ¡ ¡ # # " ¦ © ¢ ¢ ¦ ¦ © © ¦ ¢ § § ¦ ¦ ¦ ¥ ¥ ¤ ¤ ¨ £ £ ¤ ! ¥ ¥ ¦ ¦ © © © © © ¦ ¦ ¥ ¡ ¤ ¦ ¤ ¦ ¤ ¦ £ ¢ ¥ ¡ ¤ © £ ¤ £ ¥ ¢ © ¡ ¢ ¨ CONTROLLERS ¤ OSCILLATOR BANK MIXER MUSIC INC. the first sound in synthesizers moog -1- ¤ ! © ¢ ¢ ¨ ¡ ¤ ¢ © ¤ ¢ £ £ § MODIFIERS OUTPUT MINI-MOOG Field Service Manual CONTENTS Section I Title Precautionary Measures Sub-assembly Descriptions Block Diagram Trouble Analysis Guide Sub-assembly Locations Cover Removal and Sub-assembly Replacement Adjustment Procedures and Locations Keyboard Maintenance Schematic Diagrams Component Location Charts Replacement Parts Modifications Ordering and Shipping Instructions Service Department Policy Page 2 3 5 6 8 9 10 14 15 16 17 18 19 20 II III IV V VI VII VIII IX X XI XII XIII 7/73 RJF -2- Section I: Precautionary Measures In the Mini-Moog, as in any electrical device, shock hazards exist. All lethal voltages are confined to the area around the power switch and the A. C. [. . . ] Remove 18 screws (5 top, 5 lower back, and 4 each end of cover); then lift the cover off. Circuit boards are plugged into sockets at the bottom and secured at the top with two mounting screws. To remove a circuit board, first remove the screws then unplug from the connector. When replacing, be sure board is firmly seated in the connector before tightening the mounting screws. Remember to re-install the fiber washers between the boards and the frame. After board replacement, refer to Section VII: Adjustment Procedures and Locations, to determine which adjustments should be made. - 10 - Section VII: Adjustment Procedures and Locations Each time a Mini-Moog is serviced, it should be tuned. When a board has been replaced it will be necessary to make additional adjustments. Refer to the table below to determine which adjustments must be made according to the board that has been replaced. WHEN REPLACING 93-113 (Board 1) Oscillator 93-114 (Board 2) Contour Generator 93-115 (Board 3) Power Supply MAKE THESE ADJUSTMENTS 1. Set PITCH WHEEL to center, TUNE control to 0, RANGE switches to 2 ft. , WAVEFORM switches to TRIANGLE. Turn OSCILLATOR MODULATION switch off, and OSCILLATOR 3 CONTROL switch on. Connect a short patch cord from the HIGH MAIN OUTPUT jack to EXTERNAL SIGNAL INPUT jack. Turn on A-440 and rotate EXTERNAL INPUT VOLUME control slowly clockwise until the OVERLOAD light is just visible. Depress low "A" key and hold, OVERLOAD light should be blinking. Adjust OSCILLATOR 1 Range Trimpot (on oscillator board) for slowest possible blink rate. Adjust OSCILLATOR 1 Scale Trimpot (on oscillator board) for slowest possible blink rate. Depress same key and adjust Octave Range trimpot (on oscillator board) for zero beats. Noise level is factory-set to yield -5dB maximum in the white position. If the level becomes low it may be increased by counterclockwise rotation of the Noise Level Trimpot (on Power Supply board). It may be necessary to use an offset screwdriver to reach this trimpot. Connect a jumper from point "A" on the Filter Board (see Fig. While listening to the headphones, adjust the 2nd VCA Balance trimpot (on the filter board) for the minimum audio signal. [. . . ] Power Knob, Standard Knob, Large Knob, Pointer Pilot Lamp Noise Transistor Switch, Rocker (Specify color) Prop, Support Modification Kit, Oscillator Board Modification Kit, Filter Board Modification Kit, Transformer Mounting - 21 - 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 Replace R-78, R-106, and R-128 with RC Network, part number 65-032 Change R-181 from 56K to 51K 1/2 W 5% carbon Change R-170 from 15K 5% to 15K 1% Metal Film Change R-162 from 3K 5% to 3. 01K 1% Metal Film 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. [. . . ]