Yamaha EMX-68-S, EMX-88-S Service manual

SERVICE MANUAL

EMX68S EMX88S

• OPTION
RK-88 RACK MOUNT KIT

This document is printed on chlorine free (ECF) paper with soy ink.

PA 011625

EMX68S 20020325-92000
EMX88S 20020325-105000
RK88 20020325-2500

CONTENTS

SPECIFICATIONS .............................................................................. 3

PANEL LAYOUT.................................................................................. 7

CIRCUIT BOARD LAYOUT & WIRING

.......................................................................................................... 10

DIMENSIONS ....................................................................................11

BLOCK & LEVEL DIAGRAM............................................................. 12

DISASSEMBLY PROCEDURE ......................................................... 14

LSI PIN DESCRIPTION .................................................................... 20

IC BLOCK DIAGRAM........................................................................ 22

CIRCUIT BOARDS ........................................................................... 23

INSPECTION .................................................................................... 37

OVERALL CIRCUIT DIAGRAM
P ARTS LIST

HAMAMATSU, JAPAN

1,387K-7041 Printed in Japan 2002.03

EMX68S / EMX88S

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 per-

IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-

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, therefor, 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

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to

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

sonal injury, destruction of expensive components and failure of the product to per form 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.

tion, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any
form.

accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this
buss).

the unit.

WARNING: CHEMICAL CONTENT NOTICE!

IMPORTANT NOTICE FOR THE UNITED KINGDOM

Connecting the Plug and Cord

WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT: The wires in this main lead are coloured in accor-

dance with the following code:
GREEN-AND-YELLOW: EARTH
BLUE: NEUTRAL
BROWN: LIVE

As the colours of the wires in the main lead of this apparatus may not
correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The GREEN-and-YELLOW wire must be connected to the terminal in the
plug that is marked with the letter E or the safety earth symbol (or coloured
GREEN or GREEN-and-YELLOW).
The BLUE wire must be connected to the terminal that is marked with the
letter N (or coloured BLACK).
The BROWN wire must be connected to the terminal that is marked with
the letter L (or coloured RED).

This applies only to products distributed by Yamaha Kemble Music (U. K.) Ltd.

WARNING

Components having special characteristics are marked and
must be replaced with parts having specification equal to those
originally installed.

2

SPECIFICATIONS

● General specifications

Maximum output power

Frequency response

Total harmonic distortion

Hum & noise
(Average, Rs=150Ω)
(with 20 Hz–20 kHz BPF)

Maximum voltage gain

Crosstalk at 1 kHz 65 dB adjacent input, 65 dB input to output

Input channel equalization

Meters 5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT)

Graphic equalizer

Internal digital effect 16 programs, parameter control, tap delay control

MAIN L, R: 400 W+400 W/4Ω @0.5% THD at 1 kHz, 270 W+270 W/8Ω @0.5% THD at 1 kHz
MAIN BRIDGE: 800 W/8Ω @0.5% THD at 1 kHz

20 Hz–20 kHz +1 dB, –3 dB @1 W output into 8Ω (SPEAKERS OUT)
20 Hz–20 kHz +1 dB, –3 dB @+4 dB output into 10 kΩ (MAIN OUT, MONITOR OUT, EFFECT OUT)

Less than 0.5% @20 Hz–20 kHz, 200 W output into 4Ω (SPEAKERS OUT)
Less than 0.3% @20 Hz–20 kHz, +14 dB output into 10 kΩ (MAIN OUT, MONITOR OUT, EFFECT OUT)

–124 dB equivalent input noise, –65 dB residual output noise (SPEAKERS OUT)
–88 dB residual output noise (MAIN OUT, MONITOR OUT)
–79 dB (MAIN OUT) Master level control: nominal level, All channel level controls: minimum
–75 dB (MONITOR OUT) Master level control: nominal level, All channel level controls: minimum
–69 dB (MAIN OUT) Master level control: nominal level, 1 channel level control: nominal level
–84 dB (EFFECT OUT) All channel level controls: minimum
–64 dB (EFFECT OUT) 1 channel level control: nominal level

86 dB CH IN (Lo-Z) to SPEAKERS OUT
66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT
66 dB CH IN (Lo-Z) to EFFECT OUT
48 dB CH IN (Lo-Z) to REC OUT
56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT
46 dB CH IN (Super Hi-Z) to MAIN OUT
26 dB AUX IN to MAIN OUT
24 dB 2TR IN to MAIN OUT
66 dB MIC IN to MAIN OUT
26 dB LINE IN to MAIN OUT

±15 dB Maximum

HIGH 10 kHz shelving
MID 2.5 kHz peaking
LOW 100 Hz shelving

* Turn over/roll-off frequency of shelving: 3 dB below maximum variable level.

7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz)
±12 dB Maximum (MAIN OUT, MONITOR OUT)

EMX68S / EMX88S

Phantom power +15 V (balanced input)
Limiter Comp. : THD≥0.5% (SPEAKERS OUT)
LIMIT indicators Turns on. : THD≥0.5% (SPEAKERS OUT)
Protection circuit (Power

amp)
Fan circuit stop — low speed (50°C) — variable — high speed (70°C)
Foot switch (FC5) DIGITAL EFFECT MUTE : on/off, Tap delay
Optional accessories RK-88, FC5

Power requirement/
Power consumption

Dimensions (WxHxD) 482 x 305 x 328 mm
Weight 15.5 kg
Supplied accessories AC power cord, Owner’s Manual

POWER switch on/off mute, DC detection, TEMP (heatsink temp. ≥90°C)

USA and Canada 120 V AC 60 Hz/300W
Europe 230 V AC 50 Hz/350W
Other 240 V AC 50 Hz/350W

3

EMX68S / EMX88S

● Input specificaitons

Input connectors PAD

Actual load
impedance

Nominal

impedance

Sensitivity

Input level

Connector

*1

Nominal level

Max. before

clipping

type

CH INPUT (Low-Z)
(CH1–4/1–6)

CH INPUT (Hi-Z)
(CH1–2/1–4)

CH INPUT
(Super Hi-Z)
(CH3–4/5–6)

OFF

3 kΩ

ON 600Ω Lines –32 dB (19.5 mV) –20 dB (77.5 mV) +10 dB (2.45 V)

OFF

10 kΩ

ON 600Ω Lines –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)

OFF

470 kΩ 1kΩ

ON –12 dB (195 mV) 0 dB (775 mV) +10 dB (3.16 V)

50–600Ω Mics –62 dB (0.616 mV) –50 dB (2.45 mV) –20 dB (77.5 mV)

50–600Ω Mics –52 dB (1.95 mV) –40 dB (7.75 mV) –10 dB (245 mV)

–42 dB (6.16 mV) –30 dB (24.5 mV) 0 dB (775 mV)

MIC INPUT 3 kΩ 50–600Ω Mics –62 dB (0.616 mV) –50 dB (2.45 mV) –20 dB (77.5 mV)
LINE INPUT (L, R) 10 kΩ 600Ω Line –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)
AUX IN (L, R) 10 kΩ 600Ω Line –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)
2TR IN (L, R) 10 kΩ 600Ω Line –22 dBV (79.4 mV) –10 dBV (316 mV)

+17.8 dBV (7.76 V)

*1. Sensitivity is the lowest level that can produce an output of +4 dB (1.23 V) or the nominal output level when the unit is set at maximum gain.

(All level controls are at maximum position.)
*2. Balanced.
*3. Unbalanced.

• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.

● Output specificaitons

Output level

Max. before clipping

Output connectors

Actual source

impedance

Nominal

impedance

Nominal

XLR-3-31

*2

type

Phone jack

*2

(TRS)

Phone jack

*3

XLR-3-31 type
Phone jack
Phone jack
Phono jack

*3

*3

Connector

type

*2

SPEAKERS OUT

A, B (1, 2) 0.1Ω 4/8Ω Speaker 80 W/4Ω (400 W/4Ω) Phone jack
BRIDGE 0.1Ω 8Ω Speaker 160 W/8Ω ) Phone jack

(800 W/8Ω

MAIN OUT (L, R) 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
EFFECT OUT 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
MONITOR OUT 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
REC OUT (L, R) 600Ω 10 kΩ Lines –10 dBV (316 mV) +10 dBV (3.16 V) Phono jack

• All output jacks are unbalanced.

• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.

4

EMX68S / EMX88S

5

EMX68S / EMX88S

6

PANEL LAYOUT

● CONTROL P ANEL

1. CONTROL SECTION

• Channel Control

햲

햳

햴

EMX68S / EMX88S

햲 Equalizer (HIGH, MID, LOW)
햳 MONITOR control
햴 EFFECT control
햵 PAN control (EMX-68S/CH1-4, EMX-88S/CH1-6)

BAL/PAN control (EMX-68S/CH5-6, EMX-88S/CH7-8)

햶 LEVEL control
햷 PAD switch (EMX-68S/CH1-4, EMX-88S/CH1-6)

• Digital Effect

햵

햶

햷

햸 PROGRAM selector
햹 PARAMETER control
햺 ON switch
햻 TAP switch

햸

햹

햺

햻

7

EMX68S / EMX88S

• MAIN

햾햿헀

• MONITOR

햽

헃

헂

헁

21

햽 Graphic Equalizer
햾 EFFECT RTN control
햿 AUX IN control
헀 2TR IN control
헁 MASTER control
헂 Peak Level Indicator

헃 Graphic Equalizer
헄 EFFECT RTN control
헅 2TR IN control
헆 MASTER control

21

Peak Level Indicator

헄

• PHANTOM switch, indicator

• POWER AMP

헅

22

23

24

헆

22

PHANTOM ON/OFF switch

23

LIMITER indicator

24

Power Amp select switch

• YAMAHA SPEAKER PROCESSING

8

25

25

ON/OFF switch

• STAND-BY • POWER switch, indicator

27

POWER ON/OFF switch,
indicator

27

26

2. INPUT/OUTPUT SECTION

26

ON/OFF switch

햳햴 햶

EMX68S / EMX88S

햲 INPUT terminal (Low-Z)

(EMX-68S/CH1-4, EMX-88S/CH1-6)

햳 INPUT terminal (Hi-Z)

(EMX-68S/CH1-2, EMX-88S/CH1-4)

햴 INPUT terminal (Super Hi-Z)

(EMX-68S/CH3-4, EMX-88S/CH5-6)

햵 INPUT terminal (MIC, LINE)

(EMX-68S/CH5-6, EMX-88S/CH7-8)

햶 EFFECT OUT terminal
햷 FOOT SW terminal
햸 INPUT TO MAIN terminal (AUX IN, 2TR IN)
햹 OUTPUT terminal (REC OUT, MAIN(STEREO),

MONITOR)

● REAR P ANEL

햵햷햸 햹햲

햲 SPEAKERS terminal
햳 AC IN socket

햳

햲

9

EMX68S / EMX88S

CIRCUIT BOARD LAYOUT & WIRING

PWR 1/4

PWR 2/4

MIX88
MIX68

PWR 3/4

Power T ransformer

PWR 4/4

DSP

10

15P

1

CN101

PWR 2/4

PWR 1/4

3

MIX88
MIX68

AC INLET

CN104

PWR 3/4

15P

CN903

2P

CN105

CN106

6P

3P

Power T ransformer

4

27P 27P

2

CN901

DC Fan

CN107

CN101

3P

PWR 4/4

POWER
ON/OFF

DSP

Location Connector Assembly Remarks Parts No.

1 MIX68/88-PWR1/4
2 MIX68/88-DSP 100mm P=1.25 MF12710
3 PWR1/4-PWR2/4 B&B4P (V827270)
4 PWR3/4-PWR4/4 PSW V827290

24185&2426 15P L=700

V842620

DIMENSIONS

● Front View ● Side View

305mm

EMX68S / EMX88S

481.5mm

● Front View with Rack Mount Adaptor

327.6mm

62mm

448.5mm

11

EMX68S / EMX88S

C

M

M

M

BLOCK & LEVEL DIAGRAM

A

CH INPUT
EMX-68S [CH1,2]
EMX-88S [CH1-4]

CH INPUT
EMX-68S [CH3,4]
EMX-88S [CH5,6]

CH INPUT
EMX-68S [CH5,6]
EMX-88S [CH7,8]

INPUT TO MAIN

FOOT SW

Super Hi-Z

L/MONO

LINE

L/MONO

AUX IN

2TR IN

EFFECT
ON/OFF

TAP

Low-Z

Hi-Z

Low-Z

MIC

R

R

12

3

2
4

3

1

12

3

2
4

3

1

12

3

2

4

3

1

2
4

3

1

2
4

3

1
2

4

3

1

L

R

EMX-68S/88S:EN901

EMX-68S/88S:VR905

2
4

3

1
2

4

3

1

EMX-68S/88S:
SW906

EMX-68S/88S:
IC502

6
5

57

EMX-68S/88S:IC501

EMX-68S/88S:IC704

6
5

7

21-24 12-15

20 16

CN901-27PIN

13 23 22

14

MIX68
MIX88

EMX-68S:IC101
EMX-88S:IC101,301

6
5

7

EMX-68S/88S:
IC503

5

7

EMX-68S/88S:
IC701,801

57

EMX-68S/88S:
IC701,801

31

DSP

EMX-68S/88S:
IC102

EMX-68S/88S:
IC504

7

EMX-68S/88S:
IC702,802

EMX-68S/88S:
IC702,802

CN101-27PIN

18,19

20,21

EMX-68S:IC103
EMX-88S:IC103,303

57

EMX-68S/88S:IC505

57

EMX-68S/88S:IC703,803

57

31

EMX-68S/88S:IC703,803

829

CN901-27PIN

928
1027

EMX-68S/88S:IC901

EMX-68S/88S:IC901

EMX-68S/88S:IC902

EMX-68S/88S:IC902

21

67

21

57

216

EMX-68S/88S:
IC920

216

EMX-68S/88S:
IC921

216

EMX-68S/88S:
IC922

216

EMX-68S/88S:
IC923

EMX-68S/88S:
IC920

EMX-68S/88S:
IC921

EMX-68S/88S:
IC922

EMX-68S/88S:
IC923

7

7

7

7

EMX-68S/88S:
IC903

6

7

EMX-68S/88S:
IC903

2

1

EMX-68S/88S:
IC904

6

7

2

EMX-68S/88S:I

E

E

E

1

12

A’

EMX-68S/88S:
IC920

216

X-68S/88S:

920

EMX-68S/88S:
IC921

216

X-68S/88S:

921

EMX-68S/88S:
IC922

216

MX-68S/88S:

922

EMX68S / EMX88S

A

EMX-68S/88S:IC911

8

1,2,3,4,7

EMX-68S/88S:IC912

8

EMX-68S/88S:
IC903

6

7

EMX-68S/88S:IC905,906

7

EMX-68S/88S:IC914

5

7

1,2,3,4,7

2

MAIN L

4

3

1

PWR 2/4

SPEAKERS

PWR 1/4

1

A

2

BRIDGE

1

B

2

2
4

3

1

2

MAIN R

4

3

1

EMX-68S/88S:IC917,918

EMX-68S/88S:
IC917,918

EMX-68S/88S:SW905

MONITOR

CN903-15PIN

CN101-15PIN

PA

PA

W101RE1

W101BE1

W101RE2

+

W101BE2

+++

EMX-68S/88S:
IC903

2

7

1

EMX-68S/88S:IC907,908

REC OUT

EMX-68S/88S:
IC904

6

7

EMX-68S/88S:IC909,910

7

3

EMX-68S/88S:IC914

1

5

7

EMX-68S/88S:IC916

EMX-68S/88S:IC915

3

5

7

EMX-68S/88S:IC915

1

EMX-68S/88S:SW904

216

MX-68S/88S:

923

EMX-68S/88S:
IC923

2

7

1

EMX-68S/88S:IC904 EMX-68S/88S:IC916

EMX-68S/88S:IC913

8

1,2,3,4,7

3

1

2
4

3

1

EFFECT OUT

A’

38CA1-8822109 1

13

EMX68S / EMX88S

DISASSEMBLY PROCEDURE

1. Front Panel Assembly (Time required: about 3 min)

1-1. Remove the seven (7) screws marked [80] and the

screw marked [90]. (Fig.1)

1-2. Hold volume knobs and pull the front panel

forward. (Fig.1)

1-3. Remove the screw marked [100]. The front panel

assembly can then be removed. (Fig.1)

Front Panel Assembly

[80]

Body Assembly

[90]

[80]: Bind Head Screw 4.0X12 MFZN2BL (VB132700)
[90]: Bind Head Screw 4.0X20 MFZN2BL (VB403600)
[100]: Bind Head Screw A4.0X8 MFZN2BL (VP156800)

2. DSP-SPX1 Circuit Board (Time required: about 4 min)

2-1. Remove the front panel assembly. (See Procedure 1)
2-2. Remove the two (2) screws marked [170] to

remove the shield case. (Fig.2)

2-3. Remove the four (4) screws marked [140]. The

DSP-SPX1 circuit board can then be removed.
(Fig.2)

[250]

[270]

[80]

[100]

(Fig. 1)

[140]

DSP

14

[170] [140]

[140]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[170]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[250]: Cord Binder TS-0708 KSS (VZ765100)
[270]: Cable Cramp AB-3S-3M NYLON66 (V9078900)

(Fig. 2)

3. MIX68 Circuit Board (EMX68S)

(Time required: about 18 min)
MIX88 Circuit Board (EMX88S)
(Time required: about 20 min)

3-1. Remove the front panel assembly. (See Procedure 1)
3-2. Remove the cable from the cord binder marked

[250]. (Fig.2)
3-3. Remove the shield case. (See Procedure 2-2)
3-4. Pull out the connector assembly from CN101 on

the DSP-SPX1 circuit board. (Fig.4)
3-5. Remove the six (6) screws marked [240] to remove

the shield plate. (Fig.3)

EMX68S / EMX88S

PullPull

DSP

(Fig. 4)

3-6. EMX68S: Remove the fifteen (15) screws marked

[40], and the thirteen (13) screws
marked [41], and the sixteen (16)
hexagonal nuts marked [A]. (Fig.5)

EMX88S: Remove the fifteen (15) screws marked

[40], and the seventeen (17) screws
marked [41], and the eighteen (18)
hexagonal nuts marked [A]. (Fig.5)

3-7. EMX68S: Remove the eighteen (18) knobs marked

[50], the nine (9) knobs marked [60], the
nine (9) knobs marked [70], six (6)
knobs marked [80], and the nine (9)
knobs marked [90]. The mix68 circuit
board can then be removed. (Fig.5)

EMX88S: Remove the twenty-four (24) knobs

marked [50], the eleven (11) knobs
marked [60], the eleven (11) knobs
marked [70], eight (8) knobs marked
[80], and the eleven (11) knobs marked
[90]. The mix88 circuit board can then
be removed. (Fig.5)

T op Vie w

[240]

Bottom View

[240]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)

(Fig. 3)

Note: When placing the front panel assembly on

the table, take care not to weight the PWR
circuit board 4/4. (Fig.6)

15

EMX68S / EMX88S

[120]

[60] [70] [90][90]

[40] [40] [40] [40] [40] [40] [40] [40] [40][40]

EMX88SEMX68S

[50]

[60] [70] [90][90][50]

[70]
[60]

[80]
[90]

[A] [A][41] [A] [A][41][41] [41]

[40]: Screw X25 MFZNBL (V3289800)
[41]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[50]: Knob GREEN/M-GRAY (V6225300)
[60]: Knob L-GRAY/M-GRAY (V6225600)
[70]: Knob BLUE/M-GRAY (V6225400)
[80]: Knob RED/M-GRAY (V6225500)
[90]: Knob L-GRAY/D-GRAY (V6225700)

[70]
[60]

[80]
[90]

(Fig. 5)

4. PWR Circuit Board 4/4 (Time required: about 4 min)

4-1. Remove the front panel assembly. (See Procedure 1)
4-2. Pinch slightly the stopper of the power switch

escutcheon with a plyer, pull it to the front to
remove. (Fig.7-1)

4-3. Remove the two (2) screws marked [100]. (Fig.7-2)
4-4. Remove the power switch knob marked [120]. The

PWR circuit board 4/4 can then be removed.
(Fig.7-2)

(Fig. 7-1)

16

(Fig. 6)

[100][100]

[120]

(Fig. 7-2)

[100]: Bind Head Screw 3.0X8 MFZN2BL (VB659000)
[120]: Power Switch Knob MX12/4 (VU859000)

5. Rear Panel Assembly

(Time required: about 5 min)

5-1. Remove the front panel assembly. (See Procedure 1)
5-2. Remove the eight (8) screws marked [60] and the

two (2) screws marked [44]. (Fig.8)

5-3. Hold the cord holder and pull the rear panel

forward to remove. (Fig.9)

[60]

[130]

[C]

EMX68S / EMX88S

[140][150b]

[150a]

[60][44]

[44]

(Fig. 8)

[44]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)
[60]: Bind Head Screw 4.0X12 MFZN2BL (VB132700)
[130]: Bind Head Screw 4.0X30 MFZN2BL (VT229100)
[140]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)
[150]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)

Note: When reinstalling, install the rear panel

assembly and the front panel assembly in that
order to connect the PSW connector easily.

6. PWR Circuit Board 2/4

(Time required: about 7 min)

6-1. Remove the rear panel assembly. (See Procedure 5)
6-2. Remove the screw marked [150a] and the five (5)

hexagonal nuts marked [C]. The PWR circuit board
2/4 can then be removed. (Fig.8)

7. PWR Circuit Board 3/4

(Time required: about 6 min)

7-1. Remove the rear panel assembly. (See Procedure 5)
7-2. Remove the two (2) screws marked [140] and the

screw marked [150b]. (Fig.8)

7-3. Remove the screw marked [240]. The PWR circuit

board 3/4 can then be removed. (Fig.10)

(Fig. 9)

Rear Panel Assembly

[240]

(Fig. 10)

[240]: Bind Head Screw A4.0X8 MFZN2BL (VP156800)

17

EMX68S / EMX88S

[90]

8. PWR Circuit Board 1/4 (Time required: about 13 min)

8-1. Remove the rear panel assembly. (See Procedure 5)
8-2. Remove the PWR circuit board 2/4. (See Procedure 6)
8-3. Remove the PWR circuit board 3/4. (See Procedure 7)
8-4. Remove the sixteen (16) screws marked [90] to

remove the TR holder A and the TR holder B.
(Fig.11)

8-5. Remove the six (6) screws marked [40]. The PWR

circuit board 1/4 can then be removed. (Fig.12)

Upper Side View Bottom Side View

[40] Rear Panel

[90][90] [90]

PWR 1/4 PWR 1/4

(Fig. 11)

[90]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)

9. Fan (Time required: about 6 min)

9-1. Remove the rear panel assembly. (See Procedure 5)
9-2. Remove the two (2) screws marked [130]. The fan

can then be removed. (Fig.8)

10.

Power Transformer (Time required: about 4 min)

10-1. Remove the front panel assembly. (See Procedure 1)
10-2. Remove the bolt marked [D]. The power trans-

former can then be removed. (Fig.13)

Note: When reinstalling the power transformer,

make sure to lead the cables to the direction
shown in Fig.14. Leading them to unfit
direction may cause hum noise on the
system.

[90]

(Fig. 12)

[40]: Bind Head Screw SP 3.0X8 MFZN2Y
(EG330290)

18

Power T ransformer

[D]

FRONT VIEW

(Fig. 13) (Fig. 14)

Direction to lead
the cables

Power Transformer

FRONT VIEW

Body Assemb

Handle

11. Front Frame (Time required: about 6 min)

11-1. Remove the front panel assembly. (See Procedure 1)
11-2. Remove the four (4) screws marked [50] to remove

the handle assembly. (Fig.15)

11-3. Remove the ten (10) screws marked [40]. The front

frame can then be removed. (Fig.16)

EMX68S / EMX88S

Body Assemb

Body Assembly

[50] [50]

[50] [50]

ly

Handle

Handle

(Fig. 15)

[50]: Bind Head Screw 4.0X16 MFZN2BL (EG340110)

Body Assembly

[40]

[40][40]

[40]

(Fig. 16)

[40]: Bind Head Tapping Screw-P 4.0X30 MFZN2BL (V8322700)

19

EMX68S / EMX88S

LSI PIN DESCRIPTION

● M30622MCA-XXXFP (X2416A00) CPU DSP: IC109

PIN PIN

NAME I/O FUNCTION

NO.

1 P96/ I/O 41 P55/HOLD I/O CMOS 8Bit Input Output Port
2 P95/ I/O 42 P54/HLDA I/O CMOS 8Bit Input Output Port
3 P94/ I/O 43 P53/BCLK I/O CMOS 8Bit Input Output Port
4 P93/ I/O CMOS 8Bit Input Output Port 44 P52/RD I/O CMOS 8Bit Input Output Port
5 P92/ I/O 45
6 P91/ I/O 46
7 P90/ I/O 47 P47/CS3 I/O
8 BYTE I BASS change Terminal 48 P46/CS2 I/O
9 CN Vss I Change Processor Mode 49 P45/ CS1 I/O

10

P87/X CIN

11

P86/X COUT
12 RESET I Reset Input 52 P42/A18 I/O
13 X OUT O Main Clock Output 53 P41/A17 I/O
14 Vss Ground 54 P40/A16 I/O
15 X IN I Main Clock Input 55 P37/A15 I/O
16 Vcc Power Supply 56 P36/A14 I/O
17 P85/NMI I Input Only 57 P35/A13 I/O
18 P84/INT2 I/O 58 P34/A12 I/O CMOS 8Bit Input Output Port
19 P83/INT1 I/O 59 P33/A11 I/O
20 P82/INT0 I/O CMOS 8Bit Input Output Port 60 P32/A10 I/O
21

P81/T A4IN/U

22

P80/TA4OUT/U
23

P77/TA3IN

24

P76/TA3OUT
25

P75/TA2IN/W
26

P74/T A2OUT/W
27

P73/ TA1IN/V
28

P72/CLK2/TA1OUT
29

P71/RXD2
30

P70/TXD2
31

P67/TXD1

32

P66/RXD1

33

P65/CLK1
34

P64/ RTS1

35

P63/TXD0

36

P62/RXD0
37 P61/CLK0 I/O 77 P13/D11 I/O
38

P60/CTS0/RTS0

39

P57/RDY/CLKOUT

40 P56/ALE I/O CMOS 8Bit Input Output Port 80 P10/D8 I/O

I/O CMOS 8Bit Input Output Port 50 P44/CS0 I/O
I/O CMOS 8Bit Input Output Port 51 P43/A19 I/O

I/O 61 P31/A9 I/O
I/O 62 Vcc
I/O 63
I/O 64 Vss
I/O 65
I/O

CMOS 8Bit Input Output Port

I/O 67
I/O 68
I/O 69
I/O 70
I/O 71
I/O 72
I/O 73
I/O CMOS 8Bit Input Output Port 74
I/O 75
I/O 76 P14/D12 I/O

I/O 78 P12/D10 I/O
I/O CMOS 8Bit Input Output Port 79 P11/D9 I/O

NAME I/O FUNCTION

NO.

P51/WRH/BHE
P50/WRL/WR

P30/A8(/-/D7)
P27/A7(D7/D6)

66

P26/A6(/D6/D5)
P25/A5(/D5/D4)
P24/A4(/D4/D3)
P23/A3(/D3/D2)
P22/A2(/D2/D1)

P21/A1(/D1/D0)
P20/A0(/D0/-)
P17/D15/INT5
P16/D14/INT4
P15/D13/INT3

I/O CMOS 8Bit Input Output Port
I/O CMOS 8Bit Input Output Port

I/O CMOS 8Bit Input Output Port
I/O

I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O

CMOS 8Bit Input Output Port

CMOS 8Bit Input Output Port

CMOS 8Bit Input Output Port

● YM3436DK (XG948E00) DIR2 (Digital Format Interface) DSP: IC103

PIN PIN

NAME I/O FUNCTION

NO.

1 DAUX I Auxiliary input for audio data 23 RSTN I System reset input
2 HDLT O Asynchronous buffer operation flag 24 Vdda VCO section power (+5V)
3 DOUT O Audio data output 25 CTLN I VCO control input N
4 VFL O Parity flag output 26 PCO O PLL phase comparison output
5 OPT O Fs x 1 Synchronous output signal for DAC 27 ( NC )
6 SYNC O Fs x 1 Synchronous output signal for DSP 28 CTLP I VCO control input P
7 MCC O Fs x 64 Bit clock output 29 Vssa VCO section power (GND)
8 WC O Fs x 1 Word clock output 30 TSTN I Test terminal. Open for normal use

9 MCB O Fs x 128 Bit clock output 31 KM2 I Clock mode switching input 2
10 MCA O Fs x 256 Bit clock output 32 KMO I Clock mode switching input 0
11 SKSY I Clock Synchronous control input 33 FS1 O
12 XI I
13 XO O Crystal oscillator connector 35 CSM I Channel status output method selection
14 P256 O VCO oscillating clock connection 36 EXTW I
15 LOCK O PLL lock flag 37 DDIN I EIAJ (AES/EBU) data input
16 Vss Logic section power 38 LR O PLL word clock output
17 TC O PLL time constant switching output 39 Vdd Logic section power (+5V)
18 DIM1 I Data input mode selection 40 ERR O Data error flag output
19 DIM0 I Data input mode selection 41 EMP O
20 DOM1 I Data output mode selection 42 CD0 O
21 DOM0 I Data output mode selection 43 CCK I
22 KM1 I Clock mode switching input 1 44 CLD I

Crystal oscillator connection or external clock input 34

NAME I/O FUNCTION

NO.

FS0 O

Channel status sampling frequency display output 1
Channel status sampling frequency display output 0

External synchronous auxiliary input word clock

Channel status emphasis control code output
3-wire type microcomputer interface data output
3-wire type microcomputer interface clock input
3-wire type microcomputer interface load input

20

EMX68S / EMX88S

● YSS910-S (XV988A00) DSP6 (Digital Signal Processor) DPS: IC112

PIN PIN

NAME I/O FUNCTION

NO.

1 Vdd Power supply (3.3 V) 89 Vss Ground
2 Vss Ground 90 DB13 I/O
3XI I
4XO O
5 Vdd Power supply (5 V) 93 DB16 I/O
6 /SYNCI I Sync. signal input 94 DB17 I/O
7 /SYNCO O Sync. signal output 95 DB18 I/O
8 Vdd Power supply (5 V) 96 DB19 I/O

9 CKI I System clock input (30 MHz) 97 DB20 I/O
10 CKO O System clock output (30 MHz) 98 DB21 I/O
11 CKSEL I
12 Vss Ground 100 Vss Ground
13 MCKS I Serial I/O master clock input (128 x Fs) 101 Vdd Power supply (3.3 V)
14 /SSYNC I Serial I/O Sync. signal output 102 DB23 I/O
15 /IC I Initial clear 103 DB24 I/O
16 /TEST I Test mode setting (0: Test, 1: Normal) 104 DB25 I/O
17 BTYP I Data bus type select (0: 8 bit, 1: 16 bit) 105 DB26 I/O
18 /IRQ O IRQ output 106 DB27 I/O Parallel data bus
19 TRIG I/O Trigger signal input/output 107 DB28 I/O
20 Vdd Power supply (5 V) 108 DB29 I/O
21 Vss Ground 109 DB30 I/O
22 /CS I chip select signal input 110 DB31 I/O
23 /WR I Write signal input 111
24 /RD I Read signal input 112 Vss Ground
25 CA7 I/O 113 Vdd Power supply (5 V)
26 CA6 I/O 114 DA00 I/O
27 CA5 I/O 115 DA01 I/O
28 CA4 I/O Address bus of internal register 116 DA02 I/O
29 CA3 I/O 117 DA03 I/O
30 CA2 I/O 118 DA04 I/O
31 CA1 I/O 119 DA05 I/O
32 Vss Ground 120 DA06 I/O
33 Vdd Power supply (3.3 V) 121 DA07 I/O
34 CD15 I/O 122 Vss Ground
35 CD14 I/O 123 DA08 I/O
36 CD13 I/O 124 DA09 I/O
37 CD12 I/O 125 DA10 I/O
38 CD11 I/O
39 CD10 I/O 127 DA12 I/O
40 CD09 I/O 128 DA13 I/O
41 CD08 I/O 129 DA14 I/O
42 CD07 I/O 130 DA15 I/O
43 CD06 I/O 131 Vss Ground
44 Vss Ground 132 Vdd Power supply (3.3 V)
45 Vdd Power supply (3.3 V) 133 (n.c) Not used
46 Vdd Power supply (5 V) 134 Vdd Power supply (5 V)
47 CD05 I/O 135 DA16 I/O
48 CD04 I/O 136 DA17 I/O
49 CD03 I/O
50 CD02 I/O 138 DA19 I/O
51 CD01 I/O 139 DA20 I/O
52 CD00 I/O 140 DA21 I/O
53 /WAIT O WAIT output 141 DA22 I/O
54 Vss Ground 142 DA23 I/O
55 SI0 I 143 Vss Ground
56 SI1 I 144 DA24 I/O
57 SI2 I 145 DA25 I/O
58 SI3 I
59 SI4 I 147 DA27 I/O
60 SI5 I 148 DA28 I/O
61 SI6 I 149 DA29 I/O
62 SI7 I 150 DA30 I/O
63 Vss Ground 151 DA31 I/O
64 Vdd Power supply (5 V) 152 Vdd Power supply (5 V)
65 SO0 O 153 Vss Ground
66 SO1 O 154 A00 O
67 SO2 O 155 A01 O
68 SO3 O
69 SO4 O 157 A03 O
70 SO5 O 158 A04 O
71 SO6 O 159 A05 O
72 SO7 O 160 A06 O
73 Vss Ground 161 A07 O
74 DB00 I/O 162 A08 O
75 DB01 I/O 163 A09 O
76 DB02 I/O 164 Vss Ground
77 DB03 I/O 165 Vdd Power supply (3.3 V)
78 DB04 I/O 166 A10 O
79 DB05 I/O 167 A11 O
80 DB06 I/O Parallel data bus 168 A12 O
81 DB07 I/O 169 A13 O
82 DB08 I/O 170 A14 O
83 DB09 I/O 171 A15/RAS O
84 DB10 I/O 172 A16/CAS O
85 DB11 I/O 173 A17/CE O Memory address (SRAM), /CE (PSRAM)
86 DB12 I/O 174 /WE O Memory write enable signal
87 Vdd Power supply (5 V) 175 /OE O Memory output enable signal
88 Vdd Power supply (3.3 V) 176 Vdd Power supply (5 V)

System master clock input (60 MHz or 30 MHz)
System master clock output (High or 30 MHz)

System master clock select (0: 60 MHz, 1: 30 MHz)

Data bus of internal register

Data bus of internal register

Serial data input

Serial data output

NAME I/O FUNCTION

NO.

91 DB14 I/O
92 DB15 I/O

99 DB22 I/O

TIMO/DBOB

126 DA11 I/O

137 DA18 I/O

146 DA26 I/O

156 A02 O

I/O

Parallel data bus

Timing signal output/ Parallel data bus output/ input

Memory data bus

Memory data bus

Memory data bus

Memory data bus

Memory address (SRAM, PSRAM, DRAM)

Memory address (SRAM, PSRAM, DRAM)

Memory address (SRAM, PSRAM)

Memory address (SRAM, PSRAM), /RAS (DRAM)
Memory address (SRAM, PSRAM), /CAS (DRAM)

21

EMX68S / EMX88S

● AK4522VF-E2 (XW008A00) CODEC (CMOS A/D & D/A Converter) DSP: IC108

PIN PIN

NAME I/O FUNCTION

NO.

NAME I/O FUNCTION

NO.

1 VREFH I Positive voltage reference input , VA 13 SDTO O Audio serial data output

Used as a positive voltage reference by 14 SMUTE I Soft muteS
ADC & DAC, VREFH is conne externally When this pin goes H, soft mute cycle
to filtered VA. is intiated.

2 AINR+ I Rch analog positive input

When returning L, the output mute releases.
3 AINR- I Rch analog negative input 15 DEM0 I De-emphasis frequency select
4 AINL+ I Lch analog positive input 16 DEM1 I Master clock Input/X'tal input
5 AINL- I Lch analog negative input 17 MCKI I Digital power supply
6 VA - Analog power supply 18 VD - Digital ground
7 AGND - Analog ground 19 DGND - Reset
8 DIF0 I
9 DIF1 I 21 CMODE I H: 384fs, L: 256fs, NS: 512fs

Audio data interface format

20 /PD I Master clock select (Internal biased pin)

10 LRCK I Input/Output channel clock 22 AOUTL O Lch analog output
11 SCLK I Audio serial data clock 23 AOUTR O Rch analog output
12 SDTI I Audio serial data input 24 VCOM O Common voltage output , VA/2

IC BLOCK DIAGRAM

74HCU04DT (XZ110A00)

INVERTER

1Y

2A

2Y

3A

3Y

11A

2

3

4

5

6

7

SS

V

DSP: IC104

V

14

6A

13

6Y

12

5A

11

5Y

10

4A

9

4Y

8

DD

NJM2068MD-T1 (XJ553A00)
NJM4558MT-1 (IG103520)

TL072CPSR (XV423A00)

Dual Operational Amplifier

DSP-SPX1: IC105, IC106, IC107
MIX68: IC101, IC102, IC103, IC501

IC502, IC503, IC504, IC505
IC701, IC702, IC703, IC704
IC801, IC802, IC803, IC901
IC902, IC903, IC904, IC914
IC915, IC916, IC917, IC918
IC919, IC920, IC921, IC922
IC923

MIX88: IC101, IC102, IC103, IC301

IC302, IC303, IC501, IC502
IC503, IC504, IC505, IC701
IC702, IC703, IC704, IC801
IC802, IC803, IC901, IC902
IC903, IC904, IC914, IC915
IC916, IC917, IC918, IC919
IC920, IC921, IC922, IC923

74HC08DT(XZ108A00)

AND

1B

1Y

2Y

2A

2B

Output A +V
Inverting

Input A

Non-Inverting

Input A

-DC Voltage Supply

1

2

3

4

5

6

7

1

2

3

4-V

Vss

DSP: IC111

+-

+-

141A

13

12

11

10

9

8

8

7

6

5

VDD

4B

4A

4Y

3Y

3A

3B

+DC Voltage
Supply

Output B

Inverting
Input B

Non-Inverting
Input B

NJM2060M(TE2)OP (XM560A00)
Quad Operational Amplifier

MIX68: IC905, IC906, IC907, IC908

IC909, IC910

MIX88: IC905, IC906, IC907, IC908

IC909, IC910

LB1403N (XZ348A00)

LED Driver

MIX68: IC911, IC912, IC913
MIX88: IC911, IC912, IC913

+ + + + +

1D22D33D44

D1

GND5D56Amp

+

Output

7IN8

Constant

Current

Circuit

9

CC

V

22

EMX68S / EMX88S

CIRCUIT BOARDS

CONTENTS

MIX68 CIRCUIT BOARD (COMPONENT SIDE) .................................................................................................24

MIX68 CIRCUIT BOARD (PATTERN SIDE) ........................................................................................................26

MIX88 CIRCUIT BOARD (COMPONENT SIDE) .................................................................................................28

MIX88 CIRCUIT BOARD (PATTERN SIDE) ........................................................................................................30

DSP CIRCUIT BOARD (COMPONENT SIDE) ....................................................................................................32

DSP CIRCUIT BOARD (PATTERN SIDE) ...........................................................................................................33

PWR 1/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................34

PWR 2/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................36

PWR 3/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................36

PWR 4/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................36

23

EMX68S / EMX88S

E

R

●

MIX68 Circuit Board

A

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

BAL/PAN

HIGH

MID

LOW

MONITOR

EFFECT

BAL/PAN

PROG

PARAMET

LEVEL

PAD

Hi-Z Hi-Z

LEVEL

PAD

LEVEL

PAD

Super Hi-Z Super Hi-Z

LEVEL

PAD

LEVEL

LINE L

LINE R

ON

LEVEL

TAP

LINE L

LINE R

24

Low-Z Low-Z Low-Z Low-Z MIC MIC

A'

EMX68S / EMX88S

A

R

PROGRAM

PARAMETER

ON

L

TAP

EFFECT RTN

EFFECT RTN

MONITOR
GRAPHIC

EQUALIZER

MAIN GRAPHIC

EQUALIZER

AUX IN

2TR IN

2TR IN

+6
+3

0

-5

-10

MASTER

MASTER

PHAMTOM

ON / OFF

POWER AMP

MODE

YAMAHA

SPEAKER

PROCESSING

STAND BY

A’

EFFECT OUT

EFFECT
ON/OFF

TAP

3NA-V826680 1

AUX IN L

AUX IN R

2TR IN L

2TR IN R

REC OUT L

REC OUT R

MAIN L

MAIN R

POWER

to PWR1/4-CN101
to DSP-CN101

MONITOR

Component side

25

EMX68S / EMX88S

●

MIX68 Circuit Board

A

26

A’

EMX68S / EMX88S

A

A'

Pattern side

27

EMX68S / EMX88S

P

D

N

●

MIX88 Circuit Board

A

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

MONITOR

EFFECT

PAN

LOW

HIGH

MID

LOW

MONITOR

EFFECT

PAN

HIGH

MID

LOW

MONITOR

EFFECT

BAL/PAN

HIGH

MI

LOW

MO

EFFECT

BAL/

LEVEL

PAD

Hi-Z Hi-Z

LEVEL

PAD

LEVEL

PAD

Hi-Z Hi-Z

LEVEL

PAD

LEVEL

PAD

Super Hi-Z Super Hi-Z

LEVEL

PAD

LEVEL

LINE L

LINE R

LEVEL

LINE L

LINE R

28

Low-Z Low-Z

Low-Z Low-Z

Low-Z Low-Z

MIC MIC

A'

A

HIGH

EMX68S / EMX88S

LOW

EFFECT

BAL/PAN

MID

MONITOR

ON

PROGRAM

PARAMETER

EFFECT RTN

MAIN GRAPHIC

EQUALIZER

MONITOR
GRAPHIC

EQUALIZER

2TR IN

+6
+3

0

-5

-10

PHAMTOM

ON / OFF

MASTER

POWER AMP

MODE

YAMAHA

SPEAKER

PROCESSING

LEVEL

LINE L

LINE R

MIC

TAP

EFFECT OUT

EFFECT

ON/OFF

TAP

EFFECT RTN

AUX IN L

AUX IN R

AUX IN

2TR IN L

2TR IN R

REC OUT L

REC OUT R

2TR IN

MAIN L

MAIN R

MASTER

MONITOR

STAND BY

POWER

to PWR1/4-CN101
to DSP-CN101

3NA-V826670 1

A’

Component side

29

EMX68S / EMX88S

●

MIX88 Circuit Board

A

30

A’