Moog Minimoog Manuel de service télécharger pdf (Page 7)

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Section IV: Trouble Analysis Guide

Use this chart along with the block diagram (Section III) to determine which assembly or

component is defective.

MALFUNCTION PROBABLE CAUSE AND CURE

Unit dead (no pilot light) 1. Blown A.C. fuse

2. Defective power switch

3. Defective line cord or plug

Unit dead (pilot light on,

overload light off)

1. Defective power supply (board 3)

2. Defective power transformer

3. Defective output amplifier (change filter board 4)

Unit dead (pilot light and

overload light on)

1. Blown D.C. fuse

2. Defective power supply (board 3)

Excessive hum and constant

modulation of all signals

1. Defective rectifier diode on 93-118 assembly

2. Defective filter cpacitor on 93-118 assembly

3. Defective power supply (board 3)

4. Broken ground wire

No output from any mixer source

(A-440 output works)

1. Defective contour generator (board 2)

2. Defective VCA or filter (replace filter board 4)

No oscillator output (noise works) 1. Defective oscillator (board 1)

One oscillator dead or malfunctioning,

other two operating normally

1. Defective oscillator (board 1)

Oscillators drift and

exhibit poor tracking

Refer to Section XII - Modifications

under Oscillator Assembly

Oscillator 3 modulates oscillator 1 or 2

with modulation switches off

Refer to Section XII - Modifications

under Power Supply Assembly

Improper or missing waveform

(any oscillator)

1. Defective oscillator (board 1)

2. Defective waveform switch

Noise source dead or producing poor

quality noise

1. Defective noise transistor (Q15 on board 3)

2. Defective noise generator

(replace power supply board 3)

External input dead 1. Defective pre-amp (replace filter board 4)

Filter inoperative or malfunctioning 1. Defective filter board 4

Filter regeneration weak or absent

(EMPHASIS at 10)

1. Defective filter (board 4)

2. Regen. Cal. not adjusted properly

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

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Moog Minimoog Manuel de service Page 7

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