Mackie CFX12, CFX16, CFX20 Schematic
CFX series
Page 3 is interactive
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Compact Effects Mixers:
CFX•12, CFX•16 and CFX•20
MAIN OUT
MAIN INSERT
MIC
3
MIC
MIC
2
MIC
1
BAL/UNBAL
BAL/UNBAL
LINE IN
LINE IN
INSERT
INSERT
1
2
U
U
G
G
A
A
C
C
I
I
I
I
N
N
M
M
ZERO
ZERO
6
6
+50
+50
LEVEL
LEVEL
-15dB+30dB
-15dB+30dB
TRIM
TRIM
LOW CUT
LOW CUT
100 Hz
100 Hz
AUX
AUX
U
U
1
1
+15
+15
OO
OO
U
U
2
2
+15
+15
OO
OO
PRE FADER
PRE FADER
U
U
EFX
EFX
1
1
(EXT)
(EXT)
+15
+15
OO
OO
U
U
EFX
EFX
2
2
(INT)
(INT)
+15
+15
OO
OO
EQ
EQ
U
U
HI
HI
12k
12k
-15
-15
+15
+15
U
U
MID
MID
-15
-15
+15
+15
600
600
FREQ
FREQ
1.5k150
1.5k150
8k100
8k100
U
U
LOW
LOW
80Hz
80Hz
-15
-15
+15
+15
PANLRPANLRPANLRPANLRPANLRPANLRPANLRPANLRPANLRPAN
LR
1
2
ASSIGN
ASSIGN
MUTE
MUTE
dB
dB
10
10
-
2
-
1
1
5
5
3-4
3-4
U
U
5
5
10
10
20
20
30
30
40
40
SOLO
SOLO
50
50
PFL
PFL
60
60
OO
OO
4
MIC
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
LINE IN
LINE IN
INSERT
INSERT
3
4
U
G
A
C
I
M
6
+50
-15dB+30dB
TRIM
LOW CUT
100 Hz
U
+15
OO
U
+15
OO
PRE FADER
U
+15
OO
U
+15
OO
U
-15
+15
U
-15
+15
600
U
-15
+15
3
ASSIGN
dB
10
2
5
U
5
10
20
30
40
50
60
OO
U
U
G
G
A
A
C
C
I
I
I
I
N
N
M
M
ZERO
ZERO
6
6
+50
+50
LEVEL
LEVEL
-15dB+30dB
-15dB+30dB
TRIM
TRIM
LOW CUT
LOW CUT
100 Hz
100 Hz
AUX
AUX
U
U
1
1
+15
+15
OO
OO
U
U
2
2
+15
+15
OO
OO
PRE FADER
PRE FADER
U
U
EFX
EFX
1
1
(EXT)
(EXT)
+15
+15
OO
OO
U
U
EFX
EFX
2
2
(INT)
(INT)
+15
+15
OO
OO
EQ
EQ
U
U
HI
HI
12k
12k
-15
-15
+15
+15
U
U
MID
MID
-15
-15
+15
+15
600
600
FREQ
FREQ
1.5k150
1.5k150
8k100
8k100
U
U
LOW
LOW
80Hz
80Hz
-15
-15
+15
+15
4
5
ASSIGN
ASSIGN
MUTE
MUTE
dB
dB
10
10
-
2
-
2
1
1
5
5
3-4
3-4
U
U
5
5
10
10
20
20
30
30
40
40
SOLO
SOLO
50
50
PFL
PFL
60
60
OO
OO
MIC
7
MIC
5
MIC
6
BAL/UNBAL
LINE IN
LINE IN
INSERT
INSERT
5
6
U
G
A
C
I
I
I
N
N
M
ZERO
ZERO
6
+50
LEVEL
LEVEL
-15dB+30dB
TRIM
LOW CUT
100 Hz
AUX
AUX
U
1
1
+15
OO
U
2
2
+15
OO
PRE FADER
U
EFX
EFX
1
1
(EXT)
(EXT)
+15
OO
U
EFX
EFX
2
2
(INT)
(INT)
+15
OO
EQ
EQ
U
HI
HI
12k
12k
-15
+15
U
MID
MID
-15
+15
600
FREQ
FREQ
1.5k150
1.5k150
8k100
8k100
U
LOW
LOW
80Hz
80Hz
-15
+15
6
ASSIGN
MUTE
MUTE
dB
10
-
2
-
1
1
5
3-4
3-4
U
5
10
20
30
40
SOLO
SOLO
50
PFL
PFL
60
OO
8
LR
BAL/UNBAL
BAL/UNBAL
LINE IN
LINE IN
INSERT
INSERT
7
8
U
U
G
G
A
A
C
C
I
I
I
I
N
N
M
M
ZERO
ZERO
6
6
+50
+50
LEVEL
LEVEL
-15dB+30dB
-15dB+30dB
TRIM
TRIM
LOW CUT
LOW CUT
100 Hz
100 Hz
AUX
AUX
U
U
1
1
+15
+15
OO
OO
U
U
2
2
+15
+15
OO
OO
PRE FADER
PRE FADER
U
U
EFX
EFX
1
1
(EXT)
(EXT)
+15
+15
OO
OO
U
U
EFX
EFX
2
2
(INT)
(INT)
+15
+15
OO
OO
EQ
EQ
U
U
HI
HI
12k
12k
-15
-15
+15
+15
U
U
MID
MID
-15
-15
+15
+15
600
600
FREQ
FREQ
1.5k150
1.5k150
8k100
8k100
U
U
LOW
LOW
80Hz
80Hz
-15
-15
+15
+15
7
8
ASSIGN
ASSIGN
MUTE
MUTE
dB
dB
10
2
5
U
5
10
20
30
40
50
60
OO
dB
10
10
-
2
-
2
1
1
5
5
3-4
3-4
U
U
5
5
10
10
20
20
30
30
40
40
SOLO
SOLO
50
50
PFL
PFL
60
60
OO
PRE FADER
9-10
ASSIGN
OO
STEREO EFX
U
TRIM
U
OO
U
OO
U
OO
U
OO
U
-15
U
-15
U
-15
U
-15
+20-20
+15
+15
+15
+15
+15
+15
+15
+15
RETURN
1
2
(MONO) (MONO)
9
LEFT
RIGHT
10
9
10
AUX
1
2
EFX
1
(EXT)
EFX
2
(INT)
EQ
HI
12k
HI
MID
3k
LOW LOW
MID
400Hz
LOW
80Hz
MUTE
dB
10
-
2
1
5
3-4
U
5
10
20
30
40
SOLO
50
PFL
60
EFX SEND
11
LEFT
RIGHT
12
11
U
12
+20-20
TRIM
AUX
U
1
+15
OO
U
2
+15
OO
PRE FADER
U
EFX
1
(EXT)
+15
OO
U
EFX
2
(INT)
+15
OO
EQ
U
HI
12k
-15
+15
U
HI
MID
3k
-15
+15
U
MID
400Hz
-15
+15
U
LOW
80Hz
-15
+15
11- 12
ASSIGN ASSIGN
MUTE
-
2
1
3-4
SOLO
PFL
OO
TAPE
INPUT
1
L
RLR
2
MASTER SEND
U
+15
OO
U
+15
OO
U
+15
OO
DIGITAL STEREO EFFECTS PROCESSOR
CLIP
U
+15
OO
EFX
2
SEND
REVERSE
GATED
CATHEDRAL
LG.HALL
MD.HALL
LG.PLATE
MD.PLATE
SM.ROOM
NORMAL NORMAL
100 100
TIME
RATE
SUB
dB
10
5
U
5
10
20
30
40
50
60
OO
MAIN OUT
TAPE
OUTPUT
LL
R
R
123
1
L
R
AUX SENDUTILITY OUT
AUX
1
2
EFX
1
(EXT)
CUSTOM 32-BIT PRECISION
EFX 2 (INT) RETURN MASTERS
U
+15
OO
TO MAIN MIX
WIDE BYPASS
CHORUS/FLANGE/PHASER
SUB
1
ASSIGN
dB
10
LEFT
5
RIGHT
U
5
10
20
30
40
50
60
OO
4
2
SUB OUT
15
10
5
0
5
10
15
1K50025063 125 16K2K 4K 8K
STEREO GRAPHIC EQ
CFX12 MIXER
12 CHANNEL COMPACT INTEGRATED LIVE SOUND MIXER
U
U
+15
OO
+15
OO
OO
EFX 1 RETURN
1
AUX
2
AUX
EFFECTS TO MONITOR
DELAY 1
DELAY 2
OO
DELAY 3
TAPE LEVEL
DELAY 4
CHORUS
BREAK SWITCH
FLANGE
(MUTES ALL CHANNELS)
PHASER
SPRING
EFX
REVERBS
DELAYS
OO
PHONES LEVEL
DAMPING
OO
DEPTH
UTILITY OUT LEVEL
SUB
SUB
2
3
ASSIGN
ASSIGN
dB
dB
10
10
LEFT
LEFT
5
5
RIGHT
RIGHT
U
U
5
5
10
10
20
20
30
30
40
40
50
50
60
60
OO
OO
LAMP
12V 0.5A
L
EFX
R
FOOT
SWITCH
S
75Hz
SUB OUT
PHONES
15
10
5
0
5
10
15
PHANTOM POWER
48v
U
POWER STATUS
LEFT RIGHT
+20
CLIP
22
U
10
7
4
+20
2
0
2
4
ZERO
LEVEL
7
SET
10
MAX
20
U
30
0dB
=
0dBu
+10
RUDE SOLO
STEREO
4
MAIN MIX
dB
10
LEFT
5
RIGHT
U
5
10
20
30
40
50
60
OO
SERVICE MANUAL
1999,2000 MACKIE DESIGNS, INC.
820-218-00
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
2
CONTENTS
Click on any item to open that page
ALL BOARDS
Introduction.....................................................................3
Overview..........................................................................4
Block Diagram..................................................................5
Specifications...................................................................6
Safety test........................................................................9
Connectors.......................................................................10
Quick parts.......................................................................12
Parts...................................................................................A1
Fold-out Sections
Exploded Views
CFX•12.........................................................................B1
CFX•16.........................................................................C1
CFX•20.........................................................................D1
Schematics and PCB layouts
Effects board....................................................................192-1
Master board...................................................................241-1
Slave 4 board...................................................................242-1
Power supply board........................................................258-1
AC power supply.............................................................260-1
INTRODUCTION
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
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.
SERVICE TECHNICAL ASSISTANCE
Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday through
Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any
questions and speak with a carefully-calibrated technician. If one is not available, leave
a detailed message and a qualified Mackoid will return your call asap.
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.
3
Overview
The CFX mixer series consists of 3 models: the CFX•12, CFX•16 and CFX•20. Each consists
of five circuit boards: Effects, Master, Slave, Power and AC Power.
The Master board is the main mixer circuit.
The Effects board is fitted on the back of the Master board. This is exactly the same as
used in the PPM Professional Powered Mixer series.
The Slave board connects to the left of the Master board and adds four channels. The
CFX•12 has one Slave board, the CFX•16 has two, and the CFX•20 has three. This is the
main difference between the three models.
The power board regulates the AC power to +/- 15VDC, +5VDC and +48VDC (phantom
power).
The AC power board holds the IEC connector, fuse holder, power switch and caps.
This table shows which boards are used in each mixer.
Note: Each schematic chapter is labeled with the number of the board it describes. For
example, chapter 241 contains schematics and pcb layouts for circuit board number
550-241-00, chapter 192 is for circuit board 550-192-00.
MODEL EFFECTS MASTER SLAVE POWER AC POWER
CFX•12 192 241 242 (QTY 1) 258 260
CFX•16 192 241 242 (QTY 2) 258 260
CFX•20 192 241 242 (QTY 3) 258 260
4
TAPE OUT
LEFT
1
2
BREAK
MAIN OUT
LEFT
3
8K 16K
4K
2K
500 1K
250
63 125
MAIN
LEVEL
OUT
SUBWOOFER
1
2
3
MAIN OUT
RIGHT
MAIN
LEVEL
1
2
3
UTILITY OUT LEFT
8K 16K
4K
2K
500 1K
250
63 125
BREAK
PFL
TAPE OUT
RIGHT
SIGNAL
TO PHONES
UTILITY OUT RIGHT
UTILITY
LEVEL
+5
VDC
SOLO
OFF
LPF
75 Hz
TAPE
LEVEL
SOLO
PHONES
221074202471020
PHONES LEVEL
PFL
METER
SIGNAL
TO LEFT
PFL
ON
EXIT
WOODINVILLE
BOTHELL MONROE
30
ON
OFF
SOLO
SOLO
SOLO CONTROL
(ACTIVE LOW)
MAIN
RIGHT
MAIN
LEFT
SUB 4
SUB 3
SUB 2
SUB 1
CONTROL
SOLO
SOLO
AUX 1
AUX 2
EFX 1
EFX 2
SUB 1 OUT
LEFT
ASSIGN
TAPE IN
EFX 2
RIGHT
RIGHT
SOLO
MAIN INSERT
ASSIGN
SUB 4 OUT
LIGHT
RUDE SOLO
LEFT
ASSIGN
RIGHT
ASSIGN
EFX RETURN 1
STEREO EFX
STEREO EFX
RETURN 1 LEFT
3-4
1-2
PAN
MAIN
MUTE
3K
MID HI
LO MID
80 800 12K
LEFT
TRIM
LINE IN
STEREO
3K
MID HI
LO MID
80 800 12K
CHANNELS
RIGHT
RETURN 1 RIGHT
AUX 1
AUX 2
EFX 1
EFX 2
PRE/POST
SOLO CONTROL
FROM EFX
TO MAIN MIX
STEREO EFX
RETURN 2 LEFT
EFX BYPASS
EFX LEVEL SET
EFX SEND 2
(ACTIVE LOW)
EFX SEND 1
TIME/RATE
AUX SEND 1
EFX TO AUX 2
TO RIGHT MAIN
EMAC
DAMPING/DEPTH
AUX SEND 2
R
DSP
EFX WIDE
AUX SEND 2
EFX SEND 1
EFX
FOOT
SWITCH
EFX BYPASS
TO LEFT MAIN
EFX TO MAIN MIX
+5
VDC
L
AUX SEND 1
EFX TO AUX 1
STEREO EFX
RETURN 2
RIGHT
EFX
SELECT
EFX SEND 2
MAIN INSERT
LEFT
ASSIGN
RIGHT
ASSIGN
SUB 2 OUT
1-2
PAN
SOLO
MUTE
MID FREQHI
W
O
P
M
O
T
N
A
H
P
L
A
B
O
L
G
+48 VDC
LO
SET
LEVEL
INSERT
LOW CUT
TRIM
PHANTOM POWER
2
1
TAPE IN
LEFT
LEFT
ASSIGN
RIGHT
ASSIGN
SUB 3 OUT
EFX 1
AUX 1
AUX 2
3-4
PRE-P0ST
FADER
80 12K
100 Hz
HPF
3
MIC/LINE IN
MONO CHANNELS
Block Diagram
5
Specifications
Frequency Response
Mic Input to any Output (Trim at
0 dB):
+0, –1 dB, 32Hz to 20kHz
Distortion THD and SMPTE
IMD; 20Hz to 20kHz
Mic Input to Main Output:
< 0.05% @ +4 dBu output
Noise
20Hz to 20kHz BandWidth
Ω Ω
(150
Ω source impedance)
Ω Ω
Equivalent Input Noise (EIN):
–127 dBu
Residual Output Noise:
Main, Monitor, & Effects out-
puts
Channel & Master levels off
–95 dBu
Common Mode Rejection
Ratio (CMRR)
60 dB @ 1kHz, Trim @ 0 dB
Crosstalk
Adjacent Inputs or Input to Output:
–90 dB @ 1kHz
Fader Off
–90 dB @ 1kHz
Mute Switch and Break Switch
Mute
–80 dB @ 1kHz
Input Level Trim Control
Range
+6 to –50 dB
Phantom Power
+48V DC
Equalization
Low Cut: 100Hz, –18 dB/octave
Mono Channel EQ:
High ±15 dB @ 12kHz
Mid ±15 dB @ 100Hz
Low ±15 dB @ 80Hz
Stereo Channel EQ:
High ±15 dB @ 12kHz
High Mid ±15 dB @ 3kHz
Low Mid ±15 dB @ 400Hz
Low ±15 dB @ 80Hz
Graphic EQ (9 bands):
Q = 1.414, ISO octave centers
±15 dB @ 63, 125, 250, 500, 1k,
2k, 4k, 8k, 16k Hz
Mixer Rated Output
Main, Sub, Aux, & Efx: +4 dBu
Max Rated Output: +20 dBu
Maximum Input Levels
Mic Input: –28 dBu, Trim @ +50 dB
+18 dBu, Trim @ +6 dB
Line Input: –8 dBu, Trim @ +30 dB
+38 dBu, Trim @ -15 dB
Insert Input, Stereo Line Input,
Tape Input, and
Effects Return: +20 dBu
Maximum Voltage Gain
Mic Input to
Insert Output: 50 dB
Tape Output: 66 dB
Sub Output: 66 dB
Main Output: 76 dB
Aux Send: 71 dB
Line Input to
Insert Output: 30 dB
Tape Output: 46 dB
Sub Output: 46 dB
Main Output: 56 dB
Aux Send: 51 dB
Stereo Line Input to
Tape Output: 40 dB
Sub Output: 40 dB
Main Output: 50 dB
Aux Send: 45 dB
Tape Input to
Main Output: 30 dB
Effects Return to
Main Output: 30 dB
Input Impedance
Mic Input: 3kΩ, bal
Line Input: 40kΩ, bal
Insert Input, Stereo Line Input,
Tape Input, and Effects Returns:
10kΩ, unbal
Output Impedance
Main Output, Insert Output, Tape
Output, Sub Output, and Effects
Sends: 150Ω
Digital Effects
Resolution: 16-bit, 2-channel
No. of Presets: 16
Channel Level Set LED
(Sensitivity)
0 dBu (normal operating level)
VU Meters
Main L/R
12 segments:
Clip, +10, +7, +4, +2, 0, –2, –4, –7,
–10, –20, –30
Disclaimer
Since we are always striving to
make our products better by incorporating new and improved
materials, components, and manufacturing methods, we reserve the
right to change these specifications at any time without notice.
6
Effects board
BLOCK DIAGRAM
EFX SEND 2
EFX LEVEL SET
EFX BYPASS
STEREO EFX
RETURN 2 LEFT
EFX 2
EFX 1
AUX 2
AUX 1
EFX SEND 2
EFX
SELECT
TIME/RATE
DAMPING/DEPTH
EFX WIDE
EFX CONTROLS
DIGITAL STEREO EFFECTS PROCESSOR
CLIP
EFX 2 (INT) RETURN MASTERS
U
+5
VDC
L
STEREO EFX
RETURN 2
RIGHT
EMAC
DSP
CUSTOM 32-BIT PRECISION
U
EFX BYPASS
R
EFX
FOOT
SWITCH
U
U
EFX TO MAIN MIX
TO LEFT MAIN
EFX TO AUX 1
EFX TO AUX 2
TO RIGHT MAIN
This shows the signals present on
the EFX board connector J1.
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
J1
J1-8
J1-9
J1-10
J1-11
J1-12
J1-13
J1-14
J1-15
J1-16
FLAG IN
BANK
+5V
DGND
MONO IN
AGND
RIGHT OUT
LEFT OUT
POT1
POT2
CLIP_LED
N/C
BIT 0
BIT 1
BIT 2
BIT 3
+1 5
OO
EFX
2
SEND
REVERSE
GATED
CATHEDRAL
LG. HALL
MD.HALL
LG. PLATE
MD.PLATE
SM. ROOM
NORMAL NORMAL
100
TIME
RATE
+1 5
OO
TO MAIN MIX
EFX
WIDE BYPASS
REVERBS
DELAYS
CHORUS/FLANGE/PHASER
+1 5
OO
AUX
1
EFFECTS TO MONITOR
OO
AUX
DELAY 1
DELAY 2
DELAY 3
DELAY 4
CHORUS
FLANGE
PHASER
SPRING
DAMPING
DEPTH
+1 5
2
Adjustment of the rotary encoder S1 will vary the
level of BIT 0 through to BIT 3. This will select which
DSP algorithm is in effect on the EFX board’s DSP
IC U2.
The adjustment of these two pots directly affects
the CODEC IC U3. The levels are named POT 1 and
100
POT 2 at connector J1.
The state of the WIDE switch and the BYPASS
switch directly affect the DSP IC . The WIDE status
is named BANK. The BYPASS status is named FLAG.
7
The EFX board
The EFX circuit board schematics and pcb layouts are shown in chapter 192.
The circuit is made from the following main elements: Clock, CODEC, DSP and SRAM
CLOCK Y1
DSP IC U2
CODEC IC U3
SRAM U4, U5
INTEGRATED CIRCUITS
PART NO. DESCRIPTION VALUE REF
080-088-00 IC, ADSP-2163 U2
315-017-00 CRYSTAL, 24.576 MHZ 24.576 Y1
325-027-03 IC, SMD, DUAL D F/F 74HC74A U6
325-071-03 IC, HEX, INV, SMD 74HCU04 U1
329-042-03 IC, AD1819 QFP AD1819 U3
329-047-03 IC, 32KX8 SRAM 20nS 7C256-20 U4-5
FLAG IN
BANK
+5V
DGND
MONO IN
AGND
RIGHT OUT
LEFT OUT
POT1
POT2
CLIP_LED
N/C
BIT 0
BIT 1
BIT 2
BIT 3
Bypass switch
WIDE switch
Analog input
Analog outputs
Rotary
Encoder
EFX OVERVIEW
The CODEC receives a mono analog input from the mixer circuit board and converts it
into a digital signal. The CODEC also receives analog control signals from the two
Parameter pots, converts this to digital and sends a combined digital signal to the DSP.
The DSP and the two SRAM ICs, form a powerful DSP system. The DSP receives the digital
data from the CODEC as well as the direct control signals from the rotary encoder and
the EFX WIDE switch. The DSP programing selects and performs the appropriate DSP
function on the data, and sends it back to the CODEC.
The CODEC converts the incoming digital signals to two analog outputs which are sent
to the main left and right mix, and summed to the monitor mix. For Phaser and Delay
effects, the two analog outputs from the CODEC are mono. For other effects, there is a
difference between the signals.
8
Safety test
You must perform the following leakage test before returning the mixer to your customer.
Take every safety precaution to protect yourself while doing this test.
1. Make a small loading RC circuit as shown in the diagram below, and connect
the AC volt meter between the AC power source ground and any exposed metal
on the unit under test.
2. Connect the mixer under test to an AC power source using a ground-lift adaptor,
leaving the mixer’s safety ground floating. Turn the mixer on.
3. The meter reading should be less than 750mVAC (note: this is equivalent to 0.5mA
of leakage current).
4. Flip the plug over in the receptical so the hot and neutral are swapped.
Verify that the reading is still less then 750mVAC.
5. If either reading is greater than 750mVAC, then you must investigate and repair
the mixer before returning it to your customer.
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