KORG A3 SERVICE MANUAL

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II:

H H

SERVICE MANUAL
PERFORMANCE
SIGNAL PROCESSOR

A3

H

CONTENTS
1. SPECIFICATIONS ................................ 2
2. STRUCTURAL DIAGRAM ......................... 3
3. BLOCK DIAGRAM ............................... 4
4. CIRCUIT DIAGRAM .............................. 5
5. P. C. BOARD ................................... IO
6. REFERENCE DATA .............................. I4
7. CHECK AND ADJUSTMENT ...................... 23
8. PARTS LIST .................................... 25

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1. SPECIFICATIONS

I Input : Input level/impedance :+4dBm (+19dBm MAX)/1M-ohms,
-20dBm (+19dBm MAX)/lM-ohms
I Output 2 Output level/rmdepance: +4dBm (19dBmMAX)/600 ohms
-20dBm (-5dBmMAX)/600 ohms
Direct out, Output level/impedance INPUT GAIN UNITY/1K ohms
I AD/DA : 16-bit linear (DA: 4-times over-sampling digital filter)
I Sampling frequency 237.1KHz
I Frequency response :24Hz - 18KHz +1.5/-3dB
I Dynamic range : 90dB
I Memory :No. 1 - 100; No. 1 - 200 when using card
I Front panel:
KEY SW : UP, DOWN, DISPLAY SELECT, PARAMETER EDIT, UTILITY, WRITE,
POWER SW, DOUBLE FUNCTION EDITOR [A - F, CHAIN/EFFECT
(BYPASS)]
Display : Backlit LCD character display: 40 characters x 1 row
PROGRAM No. display: 7-segment LED x 3
Dot type LEDs : PERFORMANCE, INDIVIDUAL, BYPASS,
PARAMETER EDIT, UTILITY
Input level : 5-element level meter, and digital clip
INPUT VOLUME
PHONES LEVEL
CARD slot
INPUT terminal
PHONES terminal (stereo)
3 Rear panel
Switches : Input level toggling switch (-20dB/+4dB)
MIDI OUT/THRU toggling switch
INPUT terminal
DIRECT OUT terminal
OUTPUT terminal x 2 (LR)
PEDAL/SW input terminal x 2
MIDI IN
MIDI OUT/THRU
REMOTE IN
I Internal effects:REVERB GROUP; COMPRESSOR GROUP; DISTORTION GROUP;
DELAY GROUP; STEREO DELAY GROUP;
MODULATION DELAY GROUP; MODULATION GROUP;
PHASER GROUP; PAN GROUP; PITCH SHIFI'ER GROUP;
EXCITER GROUP; ENSEMBLE GROUP; ROTARY SPEAKER GROUP;
3- BAND EQUALIZER GROUP; SPEAKER SIMULATION GROUP;
PEDAL PAN GROUP; GATE GROUP; PEDAL WAH GROUP;
EARLY REFLECTION GROUP; PARAMETRIC EQ GROUP
I Power : AC 100V, 50/60 Hz
I Power consumption : 26 W
I Size (W x D x H) : 482 mm (W) x 332.5 mm (D) x 44 mm (H) (19 x 12-15/16" x 1-3/ ")
I Weight :4.5 kg .
I Optional accessories: VOLUME PEDAL (KVP-OOI), FOOT SWITCH (PS-l, PS-Z),
REMOTE CABLE (RCC-OSO, RCC-IOO),
FOOT CONTROLLER (FC6), RAM CARD (MGR-03),
ROM CARD (SPC-01~)

* Specifications subject to change without notice.