
LM3204
32 INPUT, 2+2 BUS MIXER
SERVICE MANUAL
1995, 1999 MACKIE DESIGNS, INC.
820-174-00

CONTENTS
INTRODUCTION.................................................................................3
Technical Support........................................................................3
Disclaimer.......................................................................................3
BLOCK DIAGRAM.............................................................................4
QUICK PARTS..................................................................................5-6
FOLD-OUT SECTIONS:
Front Board Schematics and PCB Layout..........................17-1
Rear Board Schematics and PCB Layout...........................18-1
Meter Board Schematics and PCB Layout.........................24-1
Power Supply Schematics and PCB Layout.......................25-1
INTRODUCTION
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
This manual contains basic service information. It is essential that you have a
copy of the user’s manual as this contains the complete operating instructions.
TECHNICAL SUPPORT
Mackie Designs Technical Support Department is available 8AM - 5PM PST,
Monday-Friday at 1-800-258-6883. Feel free to call with any questions and to
speak with a carefully-calibrated technician.
DISCLAIMER
The information contained in this manual is proprietary to Mackie Designs, Inc. The entire
manual is protected under copyright and may not be reproduced by any means without
express written permission from Mackie Designs, Inc.
EXPERIENCED REPAIR TECHNICIANS ONLY
3

QUICK PARTS
Assign to Contr ol Room
button 760-003-00
switch 500-018-00
Phones Gain(white cap)
knob
50K pot 130-012-00
760-023-00
AUX Sends (red cap)
knob 760-016-00
50K pot 130-012-00
E Q (blue cap)
knob 760-017-00
50K pot 130-011-00
Shift 3-4
button760-108-00
switch 500-012-00
Source Alt 3/4
button 760-003-00
switch 500-018-00
Aux Returns (white
knob 760-023-00
50K pot 130-012-00
cap)
Solo Gain(white cap)
Solo
button 760-108-00
switch 500-012-00
Gain (white cap)
knob 760-023-00
50K pot 130-012-00
PAN (black cap)
knob 760-018-00
50K pot 130-012-00
Mute
ALT 3/4
button 760-002-00
switch 500-018-00
Faders
gnob 760-037-01
10KD pot 130-024-00
...More Stuff...
LEDs
Rude lite
Red
Yellow
Green
304-002-00
304-001-00
304-003-00
304-004-00
5
Owners Manual
820-009-00
Phantom Switch
button
extender
switch
760-003-00
760-015-00
500-018-00
Line Cord 6’ IEC
10A
640-001-00
XLR Female Jack
400-002-01
RCA Quad
400-022-00
1/4" Female
jack 400-214-00
nut 705-003-00
washer 710-002- 00
Jack
T rim Contr ol
knob 760-007-00
5KZD pot 130-020-00
knob 760-023-00
50K pot 130-012- 00
Headphone Jack
T ape/Monitor
button 760-003-00
switch 500-012-00
Power Switch
500-013-00
IEC Recept. w/fuse
holder
110V fuse
220V fuse
100V fuse
400-009-00
510-001-00
510-002-00
510-001-00
05/99