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POWERED MIXER
SERVICE MANUAL
EMX512SC EMX312SC
· OPTION
RK512 RACK MOUNT KIT
CONTENTS
SPECIFICATIONS ( ) .......................................................3/5
PANEL LAYOUT ( )...............................................7
CIRCUIT BOARD LAYOUT ( ) ........................10
WIRING DIAGRAM( ) ....................................................11
DIMENSIONS ( ) ...................................................................13
DISASSEMBLY PROCEDURES ( ) ..................................14
LSI PIN DESCRIPTION (LSI ) .......................................24
IC BLOCK DIAGRAM (IC ) ............................................26
CIRCUIT BOARDS ( ) ................................................28
INSPECTION( ) ...................................................................50/58
PSCIRCUITBOARDREPAIRGUIDE
(PS )........................................................66/76
PARTSLIST
BLOCK & LEVEL DIAGRAM( & )
ECF
This document is printed on chlorine free (ECF) paper.
CIRCUITDIAGRAM( )
PA 011791
EMX512SC: 200510-99750 HAMAMATSU, JAPAN
EMX312SC: 200510-78750 Copyright (c) Yamaha Corporation. All rights reserved. PDFK4902 '05.09
RK512: 200510-5250
EMX512SC/EMX312SC
IMPORTANT NOTICE
This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic
service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by the users, and
have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,
destruction of expensive components and failure of the product to perform as specified. For these reasons, we advise all
Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed
service representative.
IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization certification, recognition
of any applicable technical capabilities, or establish a principalagent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service
departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in
specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the
distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated
by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (Where applicable)
components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause
cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO
EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux
vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT. GREEN-AND-YELLOW: EARTH
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your
plug proceed as follows:
The wire which is coloured GREEN-and-YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the
safety earth symbol or colored GREEN or GREEN-and-YELLOW.
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
2
EMX512SC/EMX312SC
SPECIFICATIONS
· General Specifications
Output RL Conditioins U, V A H, B, W, K, O UNIT
Maximum Output Power SPEAKERS OUT EMX512SC 4 Both ch drive, 1 kHz, MIN 500 500 500 W
8 THD+N 0.5% 350 350 320
EMX312SC 4 300 300 300
8 190 190 180
Input Output RL Conditioins MIN TYP MAX UNIT
Frequency Response CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, 10 k CH1-4 MIC/LINE: MIC 20 3.0 0.0 1.0 dB
EFFECT OUT, REC OUT Hz-20 kHz, 0 dB @ 1 kHz
SPEAKERS OUT 4 3.0 0.0 1.0
Maximum Voltage CH 1-4 INPUT B, MAIN OUT, MONITOR OUT 10 k Rs=150 CH1-4 65 dB
Gain@ 1 kHz CH 5/6-11/12 MIC MIC/LINE:MIC
Gain Error @ 1 kHz CH 1-4 INPUT B, MAIN OUT 10 k Input level: 60 dBu 2.0 4.0 6.0 dBu
It measures in each CH unit. CH 5/6-11/12 MIC CH1-4 MIC/LINE:MIC
MONITOR OUT Input level: 60 dBu 2.0 4.0 6.0
CH1-4 MIC/LINE:MIC
EFFECT OUT Input level: 60 dBu 8.0 6.0 4.0
CH1-4 MIC/LINE:MIC
REC OUT Input level: 60 dBu 12.0 10.0 8.0 dBV
CH1-4 MIC/LINE:MIC
CH 1-4 INPUT A MAIN OUT Input level: 50 dBu 2.0 4.0 6.0 dBu
MIC/LINE:MIC
CH 5/6-7/8 LINE MAIN OUT Input level: 20 dBu 2.0 4.0 6.0
(Phone)
CH 9/10-11/12 LINE MAIN OUT Input level: 20 dBu 2.0 4.0 6.0
(Pin)
Total Harmonic Distortion CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, 10 k +14 dBu @ 20 Hz, 0.5 %
It measures in each CH unit. EFFECT OUT, REC OUT 1 kHz, 20 kHz
(THD+N)
Hum & Noise CH 1-4 INPUT B, MAIN OUT 10 k EIN, Rs=150 CH1-4 115 dBu
(20 Hz-20 kHz) CH 5/6-11/12 MIC MIC/LINE:MIC
It measures in each CH unit. CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, Output Noise, Rs=150 50
EIN=Equivalent Input Noise EFFECT OUT CH1-4
MIC/LINE:MIC
Residual Output Noise MAIN OUT L, R 10 k Master control at 90 dBu
(20 Hz-20 kHz) MONITOR OUT minimum. 90
SPEAKERS OUT 4 65
Input Output Conditioins MIN TYP MAX UNIT
Crosstalk @ 1 kHz CH 1-4 Adjacent CH inputs 65 dB
It measures in each CH unit. MAIN OUT Input to Output 65
(LEVEL controls: minimum)
Output MIN TYP MAX UNIT
Phantom Voltage CH 1-4 INPUT B, No load 14 15 16 V
It measures in each CH unit. CH 5/6-11/12 MIC
CH & ST CH Equalization HIGH Turn over /roll-off frequency of 10 k (shelving) Hz
MID shelving :3dB below maximum 2.5 k (peaking)
LOW variable level. ±15dB maximum 100 (shelving)
Internal Digital Effect 16 programs, Parameter control
FOOT SW ON/OFF
Level Meters 2×5-points LED level meter [MAIN(L,R)], 5-points LED level meter [MONITOR] +6, +3, 0, 5, 10 [dB]
FCL Sensivity Input signal level 75dBu: LED on, CH1-4 MIC/LINE:MIC B Input, CH 5/6-11/12 MIC Input
Protection Power Amplifier POWER switch on/off mute
DC-fault :power supply shutdown /manual reset
Thermal /heatsink temp 90°C:output mute /auto reset
Vl limiter /RL 2
Clip limiter /THD 1 %, Indicator × 2
Power Supply Thermal /heatsink temp 100°C :power supply shutdown /manual reset
3
EMX512SC/EMX312SC
MIN TYP MAX UNIT
Power Consumption EMX512SC 500 W
EMX312SC 450
AC Cord Length 2450 2500 2550 mm
Dimensions Height 284 mm
Depth 264
Width 442.5
Net Weight 8 kg
Included Accessories Power cord, Rubber stabilizers × 2, Owener's Manual
Options RACK MOUNT KIT (RK512), FOOT SW (FC5)
Note: All level control normally: Maximum level, Output impedance of signal generator :150
· Input Characteristics
Input Terminals MIC/ Actual For Use with Input Level Connector
LINE Load Normal Sensitivity *2 Nominal ( position) Max. before Clip
Impedance
CH INPUT 1-4 XLR MIC 2 k 50-600 Mics 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 type *3
LINE 30 dBu (24.5 mV) 5 dBu (436 mV) +15 dBu (4.36 V)
Phone MIC 6 k 600 Lines 50 dBu (2.45 mV) 25 dBu (43.6 mV) 5 dBu (436 mV) Phone Jack *4
LINE 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V)
CH INPUT 5/6, 7/8 XLR 2 k 50-600 Mics 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 type *3
Phone 10 k 600 Lines 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V) Phone Jack *5
CH INPUT 9/10,11/12 XLR 2 k 50-600 Mics 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 type *3
Pin 10 k 600 Lines 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V) RCA Pin Jack
*1 0 dBu is referenced to 0.775 Vrms.
*2 Sensitivity is the lowest level that will produce an output of +4 dB (1.23 V), or the nominal output level when the unit is set to maximum level.
(All level controls are at maximum position.)
*3 XLR-3-31 type connectors are balanced. (1=GND, 2=HOT, 3=COLD)
*4 Phone Jacks are balanced. (Tip=HOT, Ring=COLD, Sleeve=GND)
*5 Phone Jacks are unbalanced.
· Output Characteristics
Output Terminals Actual Source For Use with Output Level Connector
Impedance Normal Norminal Max. before Clip
SPEAKERS 0.1 4 Speakers EMX512SC 125 W 500 W [A1, B1] SPEAKON
[A1, A2, B1, B2] EMX312SC 75 W 300 W [A2, B2] Phone Jack
MAIN OUT [L, R] 600 10 k Lines +4 dBu (1.23 V) +20 dBu (7.75 V) Phone Jack*2
EFFECT OUT 600 10 k Lines +4 dBu (1.23 V) +20 dBu (7.75 V) Phone Jack*2
MONITOR OUT 600 10 k Lines +4 dBu (1.23 V) +20 dBu (7.75 V) Phone Jack*2
REC OUT [L, R] 600 10 k Lines 10 dBu (316 mV) +10 dBu (3.16 V) RCA Pin Jack
*1 0 dBu is referenced to 0.775 Vrms. 0dBV is referenced to 1 Vrms.
*2 Phone Jacks are unbalanced.
4
EMX512SC/EMX312SC
·
RL
SPEAKERS OUT EMX512SC 4 A/B , 500 W
8 1kHz, THD+N 0.5 370
EMX312SC 4 300
8 190
RL
CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, 10 k CH1-4 MIC/LINE: MIC 20 3.0 0.0 1.0 dB
EFFECT OUT, REC OUT Hz-20 kHz, 0 dB @ 1 kHz
SPEAKERS OUT 4 3.0 0.0 1.0
@1kHz CH 1-4 INPUT B, MAIN OUT, MONITOR OUT 10 k Rs=150 CH1-4 65 dB
CH 5/6-11/12 MIC MIC/LINE:MIC
@ 1 kHz CH 1-4 INPUT B, MAIN OUT 10 k Input level: 60 dBu 2.0 4.0 6.0 dBu
CH 5/6-11/12 MIC CH1-4 MIC/LINE:MIC
MONITOR OUT Input level: 60 dBu 2.0 4.0 6.0
CH1-4 MIC/LINE:MIC
EFFECT OUT Input level: 60 dBu 8.0 6.0 4.0
CH1-4 MIC/LINE:MIC
REC OUT Input level: 60 dBu 12.0 10.0 8.0 dBV
CH1-4 MIC/LINE:MIC
CH 1-4 INPUT A MAIN OUT Input level: 50 dBu 2.0 4.0 6.0 dBu
MIC/LINE:MIC
CH 5/6-7/8 LINE MAIN OUT Input level: 20 dBu 2.0 4.0 6.0
(Phone)
CH 9/10-11/12 LINE MAIN OUT Input level: 20 dBu 2.0 4.0 6.0
(Pin)
CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, 10 k +14 dBu @ 20 Hz, 0.5 %
EFFECT OUT, REC OUT 1 kHz, 20 kHz
(THD+N)
& CH 1-4 INPUT B, MAIN OUT 10 k , 115 dBu
(20 Hz-20 kHz) CH 5/6-11/12 MIC Rs=150 CH1-4
MIC/LINE:MIC
CH INPUT 1-11/12 MAIN OUT, MONITOR OUT, Output Noize, Rs=150 50
EFFECT OUT CH1-4
MIC/LINE:MIC
MAIN OUT L, R 10 k Master = 90 dBu
(20 Hz-20 kHz) MONITOR OUT 90
SPEAKERS OUT 4 65
@ 1 kHz CH 1-4 65 dB
MAIN OUT LEVEL = 65
CH 1-4 INPUT B, 14 15 16 V
CH 5/6-11/12 MIC
HIGH 10 k (
Hz
/ :
MID 2.5 k (
3 dB
LOW ± 15dB ( ) 100 (
16 PARAMETER
ON/OFF
2 × 5 LED [MAIN(L,R)],5 LED [MONITOR]+6,+3,0, 5, 10[dB]
FCL 75dBu LED , CH1-4 MIC/LINE:MIC B, CH 5/6-11/12 MIC
POWER On/Off
DC : /
/ 90 : /
Vl /RL 2
Clip /THD 1 % , × 2
/ 100 : /
5
EMX512SC/EMX312SC
EMX512SC 500 W
EMX312SC 450
2450 2500 2550 mm
284 mm
264
442.5
8 kg
× 2 × 2
(RK512) (FC5)
Note: LEVEL = = 150
·
MIC/
LINE *2
CH INPUT 1-4 XLR MIC 2 k 50-600 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 *3
LINE 30 dBu (24.5 mV) 5 dBu (436 mV) +15 dBu (4.36 V)
Phone MIC 6 k 600 50 dBu (2.45 mV) 25 dBu (43.6 mV) 5 dBu (436 mV) *4
LINE 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V)
CH INPUT 5/6, 7/8 XLR 2 k 50-600 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 *3
Phone 10 k 600 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V) *5
CH INPUT 9/10, 11/12 XLR 2 k 50-600 60 dBu (0.775 mV) 35 dBu (13.8 mV) 15 dBu (138 mV) XLR-3-31 *3
Pin 10 k 600 20 dBu (77.5 mV) +5 dBu (1.38 V) +25 dBu (13.8 V) RCA
*1 0 dBu = 0.775 Vrms.
*2 + 4 dB(1.23 V)
*3 XLR-3-31 1 2 3
*4 T R S
*5
·
SPEAKERS 0.1 4 Speakers EMX512SC 125 W 500 W [A1, B1]
[A1, A2, B1, B2] EMX312SC 75 W 300 W [A2, B2]
MAIN OUT [L, R] 600 10 k +4 dBu (1.23 V) +20 dBu (7.75 V) *2
EFFECT OUT 600 10 k +4 dBu (1.23 V) +20 dBu (7.75 V) *2
MONITOR OUT 600 10 k +4 dBu (1.23 V) +20 dBu (7.75 V) *2
REC OUT [L, R] 600 10 k 10 dBu (316 mV) +10 dBu (3.16 V) RCA
*1 0 dBu = 0.775 Vrms 0dBV=1Vrms
*2
6
EMX512SC/EMX312SC
PANEL LAYOUT
· Controls on Each channel · Digital Effect Section
1 1 1
2
3 3 3
0
4 4 4
q
5 5 5
6 w
7
9
8 e
r
1 FCL (Feedback Channel Locating) indicator 0 PROGRAM selector
2 Equalizer gain control (HIGH, MID, and LOW) q PARAMETER control
3 MONITOR control w DIGITAL EFFECT ON switch
4 EFFECT control e EFFECT OUT jack
5 LEVEL control r FOOT SW jack
6 COMP control
7 LINE/MIC switch (Channels 1 to 4)
8 INPUT A and INPUT B jacks (Channels 1 to 4)
9 LINE and MIC jacks (Channels 5/6 to 11/12)
1 FCL 0 PROGRAM
2 EQ HIGH MID LOW q PARAMETER
3 MONITOR w DIGITAL EFFECT ON
4 EFFECT e EFFECT OUT
5 LEVEL r FOOT SW
6 COMP
7 LINE/MIC
8 INPUT A/B 1 4
9 LINE/MIC 5/6 11/12
7
EMX512SC/EMX312SC
· MAIN Section MAIN · MONITOR Section MONITOR
a f
s d
t i
y u
p o
g
t Graphic Equalizer faders a Graphic Equalizer faders
y EFFECT RETURN control s EFFECT RETURN control
u MASTER control d MASTER control
i LEVEL meters f LEVEL meters
o MAIN OUT L and R jacks g MONITOR OUT jack
p REC OUT L and R jacks
t GEQ a GEQ
y EFFECT RETURN s EFFECT RETURN
u MASTER d MASTER
i LEVEL f LEVEL
o MAIN OUT L/R g MONITOR OUT
p REC OUT L/R
8
EMX512SC/EMX312SC
· POWER Section POWER
h PHANTOM switch
j LIMITER indicators
h k POWER AMP switch
l YS Processing switch
; STAND-BY switch
z POWER switch and indicator
j h PHANTOM
j LIMITER
k k POWER AMP
l YS Processing
; STAND-BY
z POWER
l
;
z
· Rear panel
c x
x SPEAKERS jacks
c AC IN connector
x SPEAKERS
c AC IN
9
EMX512SC/EMX312SC
CIRCUIT BOARD LAYOUT
· Rear View
PA
OUT
· Top View
PS
OUT
DSP
SW
JACK
MIX
· Front View · Side View
OUT
MIX
PA
DSP
SW
PS
JACK
10
EMX512SC/EMX312SC
WIRING DIAGRAM
BLACK
7
W106
W305 OUT W107 W105
W104 W103
VIOLET
1
CN303 2
W304 W303 YELLOW
W101 W102
CN301 CN302
3* PA
CN101(14P)
ORANGE
BLACK
8
BLUE WHITE
RED
*
9 0 4 e 5 6
CN406
PS
BROWN CN405
CN407
CN409 W401
CN408
FAN
CN404
CN402
W402
CN416(13P)
CN401 CN410 CN411 CN415
(14P)
YELLOW
GRAY q
w
GRAY
r
W601 W602
SW
MIX
CN301(20P) CNM02(20P)
CN001 CN002 CN101 CN102 CN201 CN202
(3P) (3P) (3P) (3P) (3P) (3P)
DSP
CN401 CN302 CN402
(13P) (5P) (7P)
CN001 CN002 CN101 CN102 CN201 CN202
(3P) (3P) (3P) (3P) (3P) (3P)
indicates that connectors are connected
CN402 CN401 directly to circuit boards.
(5P) (7P)
JACK
* EMX512SC only
EMX512SC
11
EMX512SC/EMX312SC
No. Part No. Assembly Name Connection Remarks
1 (WE29820) Connector Assembly B&C PA-W102 <-> OUT-CN301 Violet
2 (WE29900) Connector Assembly B&C PA-W101 <-> OUT-CN302 Yellow
3 (WE29840) Connector Assembly B&C PA-W104 <-> PS-CN405 Red, EMX512SC only
4 (WE29850) Connector Assembly B&C PA-W106 <-> PS-CN406 Orange
5 (WE29860) Connector Assembly B&C PA-W107 <-> PS-CN408 Blue
6 (WE29870) Connector Assembly B&C PA-W105 <-> PS-CN409 White, EMX512SC only
7 (WE29910) Connector Assembly B&C PA-W103 <-> OUT-CN303 Black
8 (WF58250) Connector Assembly B&C OUT-W305 <-> PS-CN406 Black
9 (WE29930) Connector Assembly B&C OUT-W304 <-> PS-CN402 Brown
0 (WE29940) Connector Assembly B&C OUT-W303 <-> PS-CN401 Gray
q (WE29880) Connector Assembly B&C SW-W602 <-> PS-CN411 Yellow
w (WE29940) Connector Assembly B&C SW-W601 <-> PS-CN410 Gray
e (WE34870) Jumper Wire SMV2J P=2 14-300 PS-CN415 <-> PA-CN101
r (WE25580) Jumper Wire SMV2J P=2 13-230 PS-CN416 <-> MIX-CN401
Parts in parentheses are not available as spare parts.
12
EMX512SC/EMX312SC
DIMENSIONS
264
442.5
2.5 440
286
284
2
66.1 307.8 66.1
71 298 71
54
108
Unit: mm
mm
13
EMX512SC/EMX312SC
DISASSEMBLY PROCEDURES
· Preparing ·
A screwdriver with a long shaft is required to remove some
screws.
220 mm or more
1. Front Panel Unit 1.
(Time required: about 5 minutes) 5
1-1 Remove the eight (8) screws marked [690]. (Fig.1) 1-1 [690] 8
· Remove the jumper wire from CN416 on the PS circuit ( 1)
board and the wires (gray and yellow) from CN410 and · PS CN416 CN410
CN411 on the PS circuit board. The front panel unit can CN411
then be removed. (Photo.1 & Photo2) 1 2
* When removing the front panel only, remove the screws
and knobs marked with . (Fig.1) 1
[690] [630] [170] [130] [150] [630] [180] [150] [180] [130] [690]
[630]
[50]
[50]
[130]
[630]
[690] [630] [50] [630] [130] [690]
[50]: Bind Head Screw 4x8 MFZN2B3 (WE969000)
[130]: Bind Head Tapping Screw-S 3x6 MFZN2B3 (WE877800)
[150]: Bind Head Tapping Screw-S 3x6 MFZN2B3 (WE877800)
[170]: Bind Head Tapping Screw-B 3x12 MFZN2B3 (WE998100)
[180]: Flat Fillister H. Tapping 3x8 MFZN2W3 (WF790100)
[630]: Bind Head Tapping Screw-P 4x16 MFZN2B3 (WE980800)
[690]: Bind Head Tapping Screw-P 5x25 MFZN2W3 (WG158600)
Fig.1 1
PS circuit board (PS )
PS circuit board
(PS )
CN416
CN410 CN411
Photo.1 1
Photo.2 2
14
EMX512SC/EMX312SC
2. JACK, DSP and MIX Circuit Boards 2. JACK DSP MIX
1 Remove the front panel unit. (See procedure 1.) 1 1
2 Remove the knobs specified in the Fig.2 and Table.1. 2 2 1
3 Remove the eighteen (18) screws marked [500], twelve (12) 3 [500] 18 [490] 12 13
screws marked [490] and thirteen (13) hexagonal nuts and 2 3
washers. (Fig.2 & Fig.3) 4 [510] 14 JACK DSP MIX
4 Remove the fourteen (14) screws marked [510]. The JACK, 3
DSP and MIX circuit boards can then be removed together. 5 [514] 4 H
(Fig.3) 4
5 Remove the four (4) screws marked [514] and the shield 2-1 JACK 5
plate can then be removed. (Fig.4) 2-1-1 [511] 6 2 [410] 1 [430]
2-1 JACK Circuit Board 2 JACK 3 4
(Time required: about 5 minutes) 2-2 DSP 4
2-1-1 Remove the two (2) hexagonal spacer marked [511], the 2-2-1 [470] 2 DSP 3
screw marked [410] and the two (2) screws marked [430]. 2-2-2 [450] 4 MIX DSP
The JACK circuit board can then be removed. (Fig.3 & 3
Fig.4) 2-3 MIX 1
2-2 DSP Circuit Board 2-3-1 DSP 3
(Time required: about 4 minutes) JACK MIX
2-2-1 Remove the two (2) screws marked [470] and the cover JACK 3
DSP. (Fig.3)
2-2-2 Remove the four (4) screws marked [450]. The DSP circuit
3
board can then be separated from the MIX circuit board.
JACK: [360]
(Fig.3)
[370]
2-3 MIX Circuit Board (Time required: about 1 minute)
[610] (LINE/MIC)
2-3-1 Remove the shield. (Fig.3)
MIX: [340] (PHANTOM,YSProcessing,
* When attaching the JACK circuit board, be sure to pass STAND-BY)
the jumper wire from the MIX circuit board through the [390]
slit on the JACK circuit board. (Photo.3) [580]
* The following parts are not included in the circuit [340] PFL 3
boards. Be sure to remove them when replacing the [610] HPF
circuit boards. (Fig.3) 4
JACK: [360] Knob Black
[370] Knob Black
[610] Button D-Gray/White (LINE/MIC)
MIX: [340] Button Milky/D-Gray (PHANTOM,
YSProcessing, STAND-BY)
[390] Hexagonal Spacer
[580] Button
* When replacing [340] Button Milky/D-Gray, replace
three buttons at the save time. Also when replacing
[610] Button D-Gray/White, replace four buttons at the
same time.
3. Front Frame 3. 10
(Time required: about 10 minutes) 3-1 (1 )
3-2 JACK DSP MIX (2
3-1 Remove the front panel unit. (See procedure 1.)
)
3-2 Remove the JACK, DSP and MIX circuit boards. (See
3-3 [300] 2 3
procedure 2.)
3-4 [260] 10
3-3 Remove the two (2) screws marked [300]. (Fig.3)
( 3)
3-4 Remove the ten (10) screws marked [260]. The front frame
can then be separated from the front panel. (Fig.3)
15
EMX512SC/EMX312SC
[490]
[490]
[560]
[500]
[600]
[500]
[570]
[490]: Hex. Socket Set Screw 3x6 MFZN2B3 (WF419300)
[500]: Bonding Tapping Screw-B 3x10 MFZN2B3 (WE878000)
Fig.2 2
Table.1 1
No. Description Q'ty Control
560 Knob White/M-Gray 8 LEVEL (CH1-11/12)
570 Knob Red/M-Gray 2 MASTER (MONITOR, MAIN)
600 Knob Black 1 PROGRAM
16
EMX512SC/EMX312SC
[470]
DSP circuit board
DSP [450]
[510]
Shield
[260] DSP
SW circuit board
SW
[510]
Cover DSP
[390] DSP
[430]
[290] [390]
[580]
[510]
[260]
[390] [340]
[360]
Hexagonal nut & washer
& [300]
[410]
Power switch knob [610] [370] [510]
PSW
Switch assembly
Ass'y
[260]: Bind Head Tapping Screw-P 3x10 MFZN2B3 (WF268000)
[290]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
[300]: Hex. Socket Set Screw 3x6 MFZN2B3 (WF419300)
[410]: Bind Head Tapping Screw-S 3x5 MFZN2W3 (WE980200)
[430]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
[450]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
[470]: Bind Head Tapping Screw-S 3x5 MFZN2W3 (WE980200)
[510]: Bind Head Tapping Screw-P 3x10 MFZN2W3 (WF001000)
Fig.3 3
Shield plate
H
[514]
[511]
[511]: Hexagonal Spacer (WF514300) M3
[514]: Bonding Tapping Screw-S 3x6 MFZN2W3 (WF572000)
Fig.4 4
17
EMX512SC/EMX312SC
CN401
Slit
( )
JACK circuit board MIX circuit board
(JACK ) (MIX )
Photo.3 3
4. SW Circuit Boards 4. SW 5
(Time required: about 5 minutes) 4-1 (1 )
4-1 Remove the front panel unit. (See procedure 1.) 4-2 [300] 2
4-2 Remove the two (2) screws marked [300]. The switch Ass'y 3
assembly can then be removed from the front panel unit 4-3 PSW ( 3)
(Fig.3) 4-4 [290] 2 PS SW
4-3 Remove the power switch knob. (Fig.3) ( 3)
4-4 Remove the two (2) screws marked [290]. The SW circuit
board can then be removed from the holder. (Fig.3)
18
EMX512SC/EMX312SC
5. PS Circuit Board 5. PS 10
(Time required: about 10 minutes) 5-1 (1 )
5-1 Remove the front panel unit. (See procedure 1.) 5-2 4 2
5-2 Remove the wires specified in the Photo.4 and Table.2. 5-3 [628A] 2 ( 5)
5-3 Remove the two (2) screws marked [628A] and the GND 5-4 [640] 6 PS ( 5)
wire. (Photo.5)
5-4 Remove the six (6) screws marked [640] and the spacers.
The PS circuit board can then be removed. (Fig.5)
Rear grounding brackets
[624B]
PS circuit board
PS
[628B]
Case
[624A]
Fan DC
[628B] [627]
[640]
Spacer
[640]: Bind Head Tapping Screw-P 3x10 MFZN2W3 (WF001000)
[624B]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
[627]: Bind Head Screw 4x30 MFZN2W3 (WF105900)
Fig.5 5
19
EMX512SC/EMX312SC
Table.2 2
No. Connector Color of Wire Connected to
5
1 CN401 GRAY OUT Circuit Board
4 6
2 CN402 BROWN OUT Circuit Board
8 3 CN404 -- Fan
7 4 CN405 RED PA Circuit Board
(EMX512SC only)
5 CN406 ORANGE PA Circuit Board
6 CN407 BLACK OUT Circuit Board
7 CN408 BLUE PA Circuit Board
8 CN409 WHITE PA Circuit Board
3 (EMX512SC only)
2 9 CN415 -- Power amplifier unit
1 9
PS circuit board (PS )
Photo.4 4
PS circuit board (PS )
[624A]
[628A] [628A]
Fan (DC )
[628B]
[628B]
[624A]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
[628A]: Bind Head Screw 4x8 MFZN2W3 (WE968500)
[628B]: Bind Head Screw 4x8 MFZN2W3 (WE968500)
Photo.5 5
6. Fan (Time required: about 5 minutes) 6. DC 5
6-1 Remove the front panel unit. (See procedure 1.) 6-1 (1 )
6-2 Remove the PS circuit board. (See procedure 5.) 6-2 PS (5 )
6-3 Remove the screw marked [624A]. (Fig.5 & Photo.5) 6-3 [624A] 1 ( 5 5)
6-4 Remove the two (2) screws marked [628B]. The fan and 6-4 [628B] 2 DC
case can then be removed. (Fig.5 & Photo.5) 5 5
6-5 Remove the two (2) screws marked [627]. The fan can then 6-5 [627] 2 DC ( 5)
be separated from the case. (Fig.5)
20
EMX512SC/EMX312SC
7. Rear Panel Unit 7. 5
(Time required: about 5 minutes) 7-1 (1 )
7-1 Remove the front panel unit. (See procedure 1.) 7-2 PS (5 )
7-2 Remove the PS circuit board. (See procedure 5.) 7-3 DC (6 )
7-3 Remove the fan. (See procedure 6.) 7-4 [624B] 4
7-4 Remove the four (4) screws marked [624B] and the rear ( 5)
grounding brackets. (Fig.5) 7-5 [630] 6
7-5 Remove the six (6) screws marked [630]. The rear panel unit ( 1)
can then be removed. (Fig.1)
* When removing the rear panel only, remove the screws 6
marked with . (Fig.6)
8. OUT Circuit Board 8. OUT 10
(Time required: about 10 minutes) 8-1 (7 )
8-1 Remove the rear panel unit. (See procedure 7.) 8-2 OUT CN301 CN302 CN303 (
8-2 Remove the wires (violet, yellow and black) from CN301, ) ( 6)
CN302 and CN303 on the OUT circuit board. (Photo.6) 8-3 [190] 2 1 ( 6)
8-3 Remove the two (2) screws marked [190] and the spacer. 8-4 [150] 2 [170] 2 [180] 4
(Fig.6) 2 ( 1 6)
8-4 Remove the two (2) screws marked [150], two (2) screws 8-5 [185] 1 AC
marked [170], four (4) screws marked [180] and two OUT ( 6 7)
hexagonal nuts. (Fig.1 & Fig.6)
8-5 Remove the screw marked [185] and the GND wire from the
AC inlet. The OUT circuit board can then be removed.
(Fig.6 & Photo.7)
[190] Back
Spacer Hexagonal nut
[130] [180]
[150] [170]
OUT circuit board [50]
OUT
[130]
[185]
Power amplifier unit
Case
[50]: Bind Head Screw 4x8 MFZN2B3 (WE969000)
[130]: Bind Head Tapping Screw-S 3x6 MFZN2B3 (WE877800)
[150]: Bind Head Tapping Screw-S 3x6 MFZN2B3 (WE877800)
[170]: Bind Head Tapping Screw-B 3x12 MFZN2B3 (WE998100)
[180]: Flat Fillister H. Tapping 3x8 MFZN2W3 (WF790100)
[190]: Bind Head Tapping Screw-P 3x6 MFZN2W3 (WE877900)
Fig.6 6
21
EMX512SC/EMX312SC
[185]
CN303
CN301 CN302
Photo.6 6 [185]: Bind Head Screw 4x8 MFZN2W3 (WF106500)
Photo.7 7
9. Power Amplifier Unit 9.
(Time required: about 10 minutes) 10
9-1 Remove the rear panel unit. (See procedure 7.) 9-1 (7 )
9-2 Remove the OUT circuit board. (See procedure 8.) 9-2 OUT (8 )
9-3 Remove the five (5) screws marked [130]. (Fig.1 & Fig.6) 9-3 [130] 5 ( 1 6)
9-4 Remove the four (4) screws marked [50]. The power 9-4 [50] 4
amplifier unit then can be removed from the rear panel unit, ( 1 6)
together with the case. (Fig.1 & Fig.6) 9-5
9-5 Remove the wires from the slit of the case. (Photo.8 & ( 8 9)
Photo.9)
Slit Slit
Photo.8 8 Photo.9 9
22
EMX512SC/EMX312SC
10. PA Circuit Board 10. PA 10
(Time required: about 10 minutes) 10-1 (7 )
10-1 Remove the rear panel unit. (See procedure 7.) 10-2 OUT (8 )
10-2 Remove the OUT circuit board. (See procedure 8.) 10-3 (9 )
10-3 Remove the power amplifier unit. (See procedure 9.) 10-4 [50a] 14 ( 7)
10-4 Remove the fourteen (14) screws marked [50a]. (Fig.7) 10-5 EMX512SC [60a] 12 EMX312SC
10-5 Remove the twelve (12) screws (for EMX512SC) or four (4) [60a] 4 PA
screws (for EMX312SC) marked [60a]. The PA circuit ( 7)
board then can be removed. (Fig.7)
EMX312SC
[50a]
[60a]
[50a]
Radiation sheet
C
[50a]
EMX512SC