Moog Minimoog Wartungshandbuch PDF herunterladen (Seite 8)

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MALFUNCTION PROBABLE CAUSE AND CURE

Excessive drift or pitch change

after key is released (greater than 1

semitone per minute)

1. Defective keyboard circuit (replace board 2)

Loudness and/or filter contour

generator operate improperly

1. Defective contour generator (board 2)

No output at phones headphone jack

(main output normal)

1. Monaural plug in stereo jack

2. Defective headphone amp

(replace power supply board 3)

Overload light fails to operate

when excessive signal is applied

1. Defective bulb

2. Defective lamp driver circuit

(replace filter board 4)

Thumping sound heard

when depressing a key

(AMOUNT OF CONTOUR at 0)

1. First VCA out of balance

Refer to Section VII - Adjustments

2. Defective VCA (replace filter board 4)

3. Refer to Section XII - Modifications,

under contour generator assembly

Keyboard glides when glide is off 1. Defective keyboard circuit

(replace contour generator board 2)

Unit cannot be tuned

(A-440 on frequency, within 1 Hz)

1. Defective oscillator (board 1)

2. Defective keyboard circuit (replace board 2)

Unit cannot be tuned

(A-440 off frequency more than 5 Hz)

1. Power supply voltages improperly adjusted

2. Defective power supply (board 3)

A-440 reference oscillator dead

(other outputs normal)

1. Defective reference oscillator

(replace filter board 4)

No modulation (filter or oscillator) 1. Defective mod. mix amp.

(replace power supply bd. 3)

2. Defective MODULATION wheel control

Range switches have little or no effect 1. Octave Range misadjusted

2. -5 volt source defective

(replace oscillator board 1)

Noise or static when turning a control 1. Control dirty − spray clean

2. Control worn-out; replace

Noisy or intermittent switch 1. Switch dirty − spray clean

2. Switch worn-out; replace

Intermittent operation

or loss of some functions

1. Clean circuit board contacts with a pencil eraser

2. Tighten tension on circuit board sockets

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