Mackie 408M User Manual

PPM series
Professional Powered Mixers:
406M, 408M, 808M, 408S and 808S
SERVICE MANUAL
1999, 2000 MACKIE DESIGNS, INC.
820-185-00
EFX
MON
HI
12kHz
HI
12kHz
MID
2.5kHz
MON
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
MON
HI
12kHz
MID
2.5kHz
LOW
80Hz
PAN PAN PAN PAN PAN PAN PAN PAN
VOLUME CH. VOLUME CH. VOLUME CH. VOLUME CH. VOLUME CH. VOLUME CH. VOLUME CH. VOLUME CH.
1
EFX
LOW
80Hz
2
2
EFX
LOW
80Hz
3
3
EFX
LOW
80Hz
4
4
EFX
LOW
80Hz
5
5
EFX
LOW
80Hz
6
6
EFX
LOW
80Hz
7
8
7
EFX
LOW
80Hz
8
EFX BYPASS
EFX DRIVE
LEVEL
120
NORMAL
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
INPUT
LEVEL
SET
EFX
CLIP
PARAMETERS
100
100
REVERBS
DELAYS
CHORUS
FLANGE
DAMPING
DEPTH
PHASER
TIME
RATE
NORMAL
NORMAL
CUSTOM 32-BIT PRECISION
DIGITAL STEREO EFFECTS PROCESSING
EFX WIDE
MAIN-STEREO/MONO EQUALIZER
30
CLIP
5
5
0
10
15
20
EFX FOOT
SWITCH
RIGHT RETURNLEFT RETURN
SEND
L MIXER OUT R MIXER OUT COMPRESSOR
L POWER
AMP IN
R POWER
AMP IN
EFFECTS
(OVERRIDES INTERNAL EFX)
MONITOR
MAINS
TAPE IN
TAPE OUT
LEVEL
MIC 1 MIC 2 MIC 3 MIC 4
MIC 5 MIC 6
INSERT
INSERT INSERT INSERT INSERT
LINELINELINELINE
LINELINE
INSERT
+15
U
OO
1K50025063 125 16K
LEVEL
2K 4K 8K
MAIN
MASTER
EFX TO
MAIN
U
OO
+10
MASTER OUTPUT SECTION
LINE
U
+12dB
OO
L
R
R
L
POWER
OUT
MONITOR EQUALIZER
15-
15+
5
10
0
5
10
-15
+15
5
10
0
5
10
15-
15+
5
10
0
5
10
-15
+15
5
10
0
5
10
1K50025063 125 16K2K 4K 8K
MONITOR
MASTER
EFX TO
MON
U
OO
+10
U
+12dB
OO
75Hz RUMBLE
REDUCTION
LEFT/MONO
RIGHT
LEFT/MONO
RIGHT
MIC 7
MIC 8
75Hz RUMBLE
REDUCTION
PHANTOM
POWER CH 1-8
BREAK
(MUTES CH 1-6)
808S
POWER AMP ROUTING
STEREO
MIC/
LINE
HI-Z
STEREO
MIC/
LINE
HI-Z
SM. ROOM
MD. PLATE
LG. PLATE
LG. HALL
GATED
REVERSE
CATHEDRAL
MD. HALL
SPRING
PHASER
DELAY 4
CHORUS
DELAY 3
DELAY 1
FLANGE
DELAY 2
IN
OUT
STEREO MAINS
LEFT = MAIN
RIGHT = MONITOR
2 X 600W STEREO
LEVEL
30
CLIP
5
5
0
10
15
20
LR
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
1
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
U
OO
+15
U
OO
+10
U
+15-15
U
+15-15
U
+12-12
U
+20dB
OO
HILOW
NORMAL
RL RL RL
RL RL RL RL
RL
U
OO
+15

Mackie 408M Specifications

General

Type	Analog
Channels	8
Inputs	8
Phantom Power	Yes
Aux Sends	2
USB Interface	No
Outputs	Main
Main Outputs	2
Headphone Output	1/4"

Summary

Safety and Warnings

General Safety Precautions

Essential safety warnings regarding electric shock, fire, and proper usage.

Introduction

Service Personnel Qualifications

Specifies that only experienced technicians should service the equipment.

Block Diagram (Mono Models)

Signal Flow for 406M, 408M, 808M

Block Diagram (Stereo Models)

Signal Flow for 408S, 808S

Specifications

Power Output and Bandwidth

Details power output ratings, bandwidth, distortion, and SNR for different models.

808M/808S Power Amplifier Theory of Operation

Class-H Topology and Positive Signal Switching

Describes the high-efficiency Class-H output stage and positive signal switching.

Negative Signal Switching and Hysteresis

Explains the negative signal path and the role of hysteresis in switching.

Switching Determinants and Hysteresis Function

Details factors determining switch action and the importance of hysteresis.

Safety Test Procedure

Leakage Test Protocol

Step-by-step guide for performing a safety leakage test on the mixer.

Fusible Resistor Replacement Warning

Amplifier Tests (808M/808S)

Amplifier Tests (406M/408M/408S)

Bias Adjustment

Instructions for adjusting the bias voltage on the amplifier circuits.

Power Output Tests

EFX Circuit Overview

EFX Processing and Signal Conversion

Explains how the CODEC, DSP, and SRAM work together for effects processing.