Mackie CFX12, CFX16, CFX20 Schematic

Name: Mackie CFX12
Brand: Mackie
SKU: 8506943
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CFX series

Compact Effects Mixers:

CFX•12, CFX•16 and CFX•20

MIC 1

MIC 2

MIC 3

MIC 4

MIC 5

MIC 6

MIC 7

MIC 8

STEREO EFX

EFX SEND

TAPE

MAIN INSERT MAIN OUT

MAIN OUT

LAMP

RETURN

INPUT

OUTPUT

12V 0.5A

EFX

BAL/UNBAL

(MONO)

LINE IN

FOOT

LEFT

SWITCH

RIGHT

INSERT

UTILITY OUT

AUX SEND

SUB OUT

75Hz

PHONES

SUB OUT

IC GAIN

+50

ZERO

+50

ZERO

+50

ZERO

+50

ZERO

+50

ZERO

+50

ZERO

+50

ZERO

+50

ZERO

LEVEL

-20

+20

-20

+20

-15dB +30dB

TRIM

LOW CUT

100 Hz

AUX

+15

PRE FADER

EFX

(EXT)

+15

EFX

(INT)

+15

12k

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

MID

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

600

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

150

1.5k FREQ

LOW

MID

400Hz

100

-15

+15

-15

+15

LOW

80Hz

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

PAN

L R

MASTER SEND			15	15
		AUX	10	10
	U	AUX	5	5
			5	5
		1	0	0
OO	+15		5	5
	U		10	10
		2	15	15
OO	+15			63 125 250 500 1K 2K 4K 8K 16K
		EFX		STEREO GRAPHIC EQ
	U	EFX		CFX12 MIXER
		(EXT)		CFX12 MIXER
		1
OO	+15		12 CHANNEL COMPACT INTEGRATED LIVE SOUND MIXER

		CUSTOM 32-BIT PRECISION						PHANTOM POWER
DIGITAL STEREO EFFECTS PROCESSOR
CLIP		EFX 2 (INT) RETURN MASTERS						48v
		EFX 2 (INT) RETURN MASTERS						48v
	U	U	U		U		U	POWER	STATUS
								LEFT	RIGHT
OO	+15	OO +15	OO +15	OO	+15	OO	+20		22	CLIP
EFX 2		TO MAIN MIX	AUX 1	AUX 2		EFX 1 RETURN			22	CLIP
EFX 2		TO MAIN MIX	AUX 1	AUX 2			U		10
SEND			EFFECTS TO MONITOR						10
REVERSE				DELAY 1					7
	GATED			DELAY 2			+20		4
CATHEDRAL				DELAY 3		OO	+20		2
CATHEDRAL				DELAY 3		TAPE LEVEL			2
LG. HALL				DELAY 4					0
MD. HALL				CHORUS					0
LG. PLATE				FLANGE		BREAK SWITCH			2
LG. PLATE				FLANGE		(MUTES ALL CHANNELS)			2
MD. PLATE				PHASER			ZERO		4
SM. ROOM				SPRING			ZERO		7
NORMAL		EFX		NORMAL			LEVEL		7
NORMAL		EFX		NORMAL			SET
						OO	MAX		10
						PHONES LEVEL			20
							U		20
		WIDE	BYPASS						30
0	10	REVERBS		0	10			0dB=0dBu
TIME		DELAYS		DAMPING		OO	+10	RUDE	SOLO
RATE		CHORUS/FLANGE/PHASER		DEPTH		UTILITY OUT LEVEL

1		2		3		4		5		6		7		8		9-10		11-12		SUB	1	SUB	2	SUB	3	SUB	4	STEREO
ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN		ASSIGN	1	ASSIGN	2	ASSIGN	3	ASSIGN	4	MAIN MIX
dB	MUTE		MUTE	dB	MUTE	dB	MUTE		MUTE	dB	MUTE	dB	MUTE		MUTE	dB	MUTE	dB	MUTE			dB		dB		dB		dB
dB		dB		dB		dB		dB		dB		dB		dB		dB		dB		dB		dB		dB		dB		dB
10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	1-2	10	LEFT	10	LEFT	10	LEFT	10	LEFT	10

5	5		5		5		5		5		5		5		5		5		5			5		5		5		5

3-4

RIGHT

5		5	5		5	5		5		5	5		5		5	5	5	5	5	5
10		10	10		10	10		10		10	10		10		10	10	10	10	10	10
20		20	20		20	20		20		20	20		20		20	20	20	20	20	20
30		30	30		30	30		30		30	30		30		30	30	30	30	30	30
40	SOLO	40	SOLO 40	SOLO	40	SOLO 40	SOLO	40	SOLO	40	SOLO 40	SOLO	40	SOLO	40	SOLO 40	40	40	40	40
50	PFL	50	PFL 50	PFL	50	PFL 50	PFL	50	PFL	50	PFL 50	PFL	50	PFL	50	PFL 50	50	50	50	50
60		60	60		60	60		60		60	60		60		60	60	60	60	60	60

SERVICE MANUAL

ã1999,ã2000 MACKIE DESIGNS, INC. 820-218-00

Page 3 is interactive

SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY

EXPERIENCED REPAIR TECHNICIANS ONLY

Click on any item to open that page

CONTENTS
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

ALL BOARDS

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.

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

Block Diagram

SOLO CONTROL

EFX2

EFX1

AUX2

AUX1

SOLO

SUB1

SUB2

SUB3

SUB4

LEFT MAIN

RIGHT MAIN

SUB 1 OUT

H A

N T O

O W

B A

L O

+48 VDC

LEFT

ASSIGN

PHANTOM POWER

SOLO

RIGHT

INSERT

ASSIGN

TRIM

LEVEL

SUB 2 OUT

MAIN INSERT

SET

PAN

TAPE OUT

LOW CUT

LO MID FREQHI

MUTE

1-2

LEFT

12K

BREAK

100 Hz

63 125250500 1K 2K

8K 16K

MAIN OUT

LEFT

HPF

LEFT

FADER

ASSIGN

3-4

MAIN

LEVEL

TAPE IN

PRE-P0ST

RIGHT

LEFT

ASSIGN

AUX 1

SUB 3 OUT

SUBWOOFER

MIC/LINE IN

OUT

AUX 2

TAPE

MONO CHANNELS

75 Hz

LEVEL

EFX 1

LPF

LEFT

ASSIGN

EFX 2

TAPE IN

RIGHT

SOLO

RIGHT

MAIN INSERT

ASSIGN

MAIN

SUB 4 OUT

LEVEL

MID MID HI

63 125250500 1K 2K 4K

8K 16K

MAIN OUT

LEFT

800

12K

BREAK

RIGHT

LEFT

1-2

3-4

ASSIGN

TAPE OUT

MUTE

PAN

RIGHT

LINE IN

TRIM

MAIN

STEREO

CHANNELS

MID MID HI

RIGHT

800

12K

ASSIGN

STEREO EFX

RETURN 1 LEFT

PFL

AUX 1

SIGNAL

TO PHONES

PRE/POST

AUX 2

EFX RETURN 1

EFX 1

STEREO EFX

RUDE SOLO

UTILITY OUT LEFT

LIGHT

RETURN 1 RIGHT

EFX 2

UTILITY

LEVEL

EFX SEND 2

VDC

UTILITY OUT RIGHT

STEREO EFX

FROM EFX

SOLO

RETURN 2 LEFT

TO MAIN MIX

OFF

EFX LEVEL SET

EFX BYPASS

SOLO CONTROL

SOLO

(ACTIVE LOW)

EFX TO MAIN MIX

PFL

TO LEFT MAIN

VDC

PHONES

EFX SEND 2

STEREO EFX

PHONES LEVEL

EFX

RETURN 2

EFX TO AUX 1

SELECT

RIGHT

AUX SEND 1

BOTHELL

MONROE

TIME/RATE

EMAC

WOODINVILLE

PFL

SIGNAL

EFX TO AUX 2

AUX SEND 1

EXIT

METER

TO LEFT

DAMPING/DEPTH

DSP

TO RIGHT MAIN

AUX SEND 2

EFX WIDE

AUX SEND 2

EFX SEND 1

EFX

FOOT

SOLO

SWITCH

EFX BYPASS

OFF

EFX SEND 1

SOLO CONTROL

SOLO

(ACTIVE LOW)

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 (150Ω source impedance)

Equivalent Input Noise (EIN): –127 dBu

Residual Output Noise:

Main, Monitor, & Effects outputs

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.

Effects board

BLOCK DIAGRAM

EFX2

EFX1

AUX2

AUX1

EFX SEND 2			STEREO EFX
			RETURN 2 LEFT
	EFX LEVEL SET	EFX BYPASS
				EFX TO MAIN MIX
		+5		TO LEFT MAIN
		VDC
		L
EFX SEND 2 EFX			STEREO EFX
EFX SEND 2 EFX			RETURN 2	EFX TO AUX 1
SELECT			RIGHT	EFX TO AUX 1
SELECT			RIGHT
TIME/RATE	EMAC
	EMAC			EFX TO AUX 2
DAMPING/DEPTH	DSP			TO RIGHT MAIN
	DSP	R
EFX WIDE
			EFX
			FOOT
	EFX BYPASS		SWITCH
	EFX BYPASS

EFX CONTROLS

CUSTOM 32-BIT PRECISION

DIGITAL STEREO EFFECTS PROCESSOR

CLIP	EFX 2 (INT) RETURN MASTERS
	EFX 2 (INT) RETURN MASTERS
U	U	U	U

This shows the signals present on the EFX board connector J1.

	J1-1	FLAG IN
	J1-1	FLAG IN
	J1-2	BANK
	J1-3	+5V
	J1-4	DGND
	J1-5	MONO IN
J1	J1-6	AGND
	J1-7	RIGHT OUT
	J1-8	LEFT OUT
	J1-9	POT1
	J1-10	POT2
	J1-11	CLIP_LED
	J1-12	N/C
	J1-13	BIT 0
	J1-14	BIT 1
	J1-15	BIT 2
	J1-16	BIT 3

OO	+15	OO	+15	OO +15	OO	+15
EFX 2 TO MAIN MIX				AUX 1	AUX 2
SEND				EFFECTS TO MONITOR
REVERSE					DELAY 1
	GATED				DELAY 2
CATHEDRAL					DELAY 3
LG. HALL					DELAY 4
MD. HALL					CHORUS
LG. PLATE					FLANGE
MD. PLATE					PHASER
SM. ROOM					SPRING
NORMAL			EFX		NORMAL
0	10		WIDE	BYPASS	0	10
			REVERBS
TIME					DAMPING
			DELAYS

RATE		CHORUS/FLANGE/PHASER			DEPTH

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 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.

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	FLAG IN	Bypass switch
	BANK	WIDE switch
	+5V
	DGND	Analog input
	MONO IN	Analog input
	AGND
	RIGHT OUTAnalog outputs
	LEFT OUT
CODEC IC U3	POT1
CODEC IC U3	POT2
	CLIP_LED
	N/C
	BIT 0	Rotary
	BIT 1	Rotary
	BIT 2	Encoder
SRAM U4, U5	BIT 3
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

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.

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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