Minimoog Service & Operation Manual

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"1) Schematics and Circuit Diagrams: Twenty 11"x17" schematic diagrams on ten double sided fold out sheets dated 1970 - 1973 with these titles:

* MINI D OSCILLATOR P.C. BRD. ASSY. SCHEMATIC (Date: 4-10-72, Moog Music Inc., Williamsburg, New York)

* MINI BOARD No.3 SCHEMATIC DIAGRAM ( Date: 7–5-73, Moog Music Inc., Williamsburg New York.) There are 4 circuit diag. on this page: “DUAL VOLTAGE REGULATOR”, “MODULATION AMP MIX”, “NOISE GENERATOR”, “HEADPHONE AMP”.

* MINI-MOOG BOARD 1 COMPONENT LOCATION (Date: 7-73, Moog Music Inc., Williamsburg, New York)

* MINI-MOOG BOARD 2 COMPONENT LOCATION (Date: 7-73, Moog Music Inc.,Williamsburg, New York)

* MINI-MOOG BOARD 3 COMPONENT LOCATION (Date: 7-73, Moog Music Inc., Williamsburg, New York)

* MINI-MOOG BOARD 4 COMPONENT LOCATION (Date: 7-73, Moog Music Inc., Williamsburg, New York)

* MINI BOARD No.2 CONTOUR GEN. & KEYBOARD CIRCUIT SCHEM. DIAG. (Date: 7-73 Moog Music Inc., Williamsburg, New York)

* MINI “D” FILTER BOARD ASSY. SCHEMATIC BOARD 4 (Date: 7-73, Moog Music Inc., Williamsburg, New York)

* MINI SYNTH BLOCK DIAG. (No date shown on sheet, R. A. MOOG CO., TRUMANSBURG, New York)

* RANDOM SIGNAL GENERATOR (Date: 11-3-70, R. A. MOOG CO., TRUMANSBURG, New York)

* POWER SUPPLY (Date: 11-9-70, R. A. MOOG CO., TRUMANSBURG, New York)

* KEYBOARD CIRCUIT. (No date shown on sheet, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI SCHEMATIC { Ext Preamp & Lamp Driver } (Date: 12-70, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI ‘D’ A440 REF OSC. (No date shown on sheet, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI D MODULATION MIX AMP (Date: 12-31-70, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI D DUAL VOLTAGE CONTROLLED AMP. (Date: 12-31-70, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI D VOLTAGE CONTROLLED FILTER. (Date: 1-3-71, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI MOOG D HEADPHONE AMP. (Date: 1-5-70, R. A. MOOG CO., TRUMANSBURG, New York)

* WAVEFORM SWITCHING MINI ‘D’ (No date shown on sheet, R. A. MOOG CO., TRUMANSBURG, New York)

* MINI D LEFT HAND CONTROLLER (Rev “A” Date: 6–28-71, ECN OC44 7-9-71, R. A. MOOG CO., TRUMANSBURG, New York)


2) Operating Guide

Introduction
Basic Mini Moog Features
Audio Control, & Timing Signals
Setting Up the Instrument
Output Section
Oscillator Bank
Controllers
Modulation Mix: 9 procedures to explain how to use the modulation mix in controlling the pitch of oscillator 1.
Other Controllers
Pitch Wheel
Tune Control
Glide Control
Keyboard itself
Mixer:
Osc. Vol. Control
Ext. Input Vol. Control
Noise Vol. Control
Modifiers:
Filters
Cutoff Frequency Control
Amount of Contour Control
Attack Time Control
Decay Time Control
Sustain Level Control
Emphasis Control
Modulation Mix of Oscillators
Loudness Contour

3) Trouble Analysis Guide

(TROUBLE SHOOTING)

"Malfunction" and "Probable Cause & Cure" are given for:

Unit Dead (no pilot light)
Unit Dead (pilot light on; overload light off)
Unit Dead (pilot light & overload light on)
Excessive HUM & constant modulation of all signals
No output from any mixer source (A-440 works)
No oscillator output
Various oscillator problems: (drift, poor tracking, waveform difficulties etc)
Noise source dead or poor quality
Input dead
Filter problems
Excessive drift or pitch change after key is released
Loudness &/or filter contour generator problems
No output at phone jack
Overload light problems
Thumping sound
Keyboard glides when glide is off
Unit cannot be tuned
Noise or static when turning a control
Noisy or intermittent switch
Range switches have little or no effect
And more
4) Adjustment Procedures & Locations

Each time the Minimoog is serviced, it should be tuned. When a board has been replaced it will be necessary to make additional adjustments. A table is given to determine which adjustments must be made according to the board that has been replaced. The titles: "WHEN REPLACING" and "MAKE THESE ADJUSTMENTS" are used in the table for:

Bd 1 Osc.
Bd 2 Contour Gen.
Bd 3 Pwr Supply
Bd 4 Filter
L.H. Cont.
Another Chart Shows How to Make Adjustments:

The titles: "TO ADJUST" and "FOLLOW THIS PROCEDURE" are used in the table for:

Volts
A-440
Osc. Tuning (with & without equipment)
Voltage Rate Trimmer
Noise Level
VCA Balance
Filter Range & Scale
Pitch Wheel
Modulation Wheel
Regen. Cal.
Diagrams are given to help. ie: Adjustment Locations for Oscillator, Power Supply, Filter

5) Extra Information:

Keyboard Maintenance
Replacement Parts List
Modifications
Cover Removal & Sub-assembly Replacement
Left Hand Controller.
GLIDE Jack.
Connecting a foot controller rather than foot switch to the GLIDE jack.
Foot Pedal to adjust DECAY to any value faster than that set by control 21 or 24.
Back Panel Adjustments on serial # 1237 & higher.
Location of rear panel adjustments: (Diagram)
How to Tune the Oscillators: (13 step explanation and a diagram).
How to Tune the Filter: (6 step explanation and a diagram)
Standard Accessories Shipped with Synth.
Optional Accessories Available for Use.
S-Trig Plug.
Sub-assembly Description: Locations, Oscillators, Contour Generator, Power Supply, Filter, Rectifier Board, Keyboard
And More
This service manual is for the earlier Minimoog models produced before the company was sold to Norlin. Good condition, complete, legible, high quality, clear, not a factory produced original, minor marks from use."