Yamaha EMX88S User manual

SERVICE MANUAL
HAMAMATSU, JAPAN
1,387K-7041 Printed in Japan 2002.03
PA 011625
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
PARTS LIST
EMX68S EMX88S
This document is printed on chlorine free (ECF) paper with soy ink.
• OPTION
RK-88 RACK MOUNT KIT
EMX68S 20020325-92000
EMX88S 20020325-105000
RK88 20020325-2500

2
EMX68S / EMX88S
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 per-
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.
IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-
tion, recognition of any applicable technical capabilities, or establish a principal-agent 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, 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
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this
buss).
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 WelfareAgency (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 FORANY 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
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.

3
EMX68S / EMX88S
SPECIFICATIONS
● General specifications
Maximum output power 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
Frequency response 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)
Total harmonic distortion 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)
Hum & noise
(Average, Rs=150Ω)
(with 20 Hz–20 kHz BPF)
–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
Maximum voltage gain
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
Crosstalk at 1 kHz 65 dB adjacent input, 65 dB input to output
Input channel equalization
±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.
Meters 5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT)
Graphic equalizer 7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz)
±12 dB Maximum (MAIN OUT, MONITOR OUT)
Internal digital effect 16 programs, parameter control, tap delay control
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) POWER switch on/off mute, DC detection, TEMP (heatsink temp.≥90°C)
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
USA and Canada 120 V AC 60 Hz/300W
Europe 230 VAC 50 Hz/350W
Other 240 V AC 50 Hz/350W
Dimensions (WxHxD) 482 x 305 x 328 mm
Weight 15.5 kg
Supplied accessories AC power cord, Owner’s Manual

4
EMX68S / EMX88S
• All output jacks are unbalanced.
• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.
Input connectors PAD Actualload
impedance Nominal impedance
Input level Connector
type
Sensitivity*1
*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.)
Nominal level Max. before
clipping
CH INPUT (Low-Z)
(CH1–4/1–6) OFF 3 kΩ50–600ΩMics –62 dB (0.616 mV) –50 dB (2.45 mV) –20 dB (77.5 mV) XLR-3-31
type*2
*2. Balanced.
ON 600ΩLines –32 dB (19.5 mV) –20 dB (77.5 mV) +10 dB (2.45V)
CH INPUT (Hi-Z)
(CH1–2/1–4) OFF 10 kΩ50–600ΩMics –52 dB (1.95 mV) –40 dB (7.75 mV) –10 dB (245 mV) Phone jack
(TRS)*2
ON 600ΩLines –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)
CH INPUT
(Super Hi-Z)
(CH3–4/5–6)
OFF 470 kΩ1kΩ–42 dB (6.16 mV) –30 dB (24.5 mV) 0 dB (775 mV) Phone jack*3
ON –12 dB (195 mV) 0 dB (775 mV) +10 dB (3.16 V)
MIC INPUT 3 kΩ50–600ΩMics –62 dB (0.616 mV) –50 dB (2.45 mV) –20 dB (77.5 mV) XLR-3-31 type*2
LINE INPUT (L, R) 10 kΩ600ΩLine –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) Phone jack*3
*3. Unbalanced.
• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.
AUX IN (L, R) 10 kΩ600ΩLine –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) Phone jack*3
2TR IN (L, R) 10 kΩ600ΩLine –22 dBV (79.4 mV) –10 dBV (316 mV) +17.8 dBV (7.76 V)
Phono jack
Output connectors Actual source
impedance Nominal impedance
Output level Connector
type
Nominal
Max. before clipping
SPEAKERS OUT A, B (1, 2) 0.1Ω4/8ΩSpeaker 80 W/4Ω(400 W/4Ω) Phone jack
BRIDGE 0.1Ω8ΩSpeaker 160 W/8Ω) Phone jack
MAIN OUT (L, R) 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
EFFECT OUT 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
MONITOR OUT 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
REC OUT (L, R) 600Ω10 kΩLines –10 dBV (316 mV) +10 dBV (3.16 V) Phono jack
(800 W/8Ω
● Input specificaitons
● Output specificaitons

5
EMX68S / EMX88S

6
EMX68S / EMX88S

7
EMX68S / EMX88S
PANEL LAYOUT
햲
햳
햴
햵
햶
햷
햸
햹
햺
햻
●CONTROLPANEL
1. CONTROL SECTION
•Channel Control
햲Equalizer (HIGH, MID, LOW)
햳MONITOR control
햴EFFECT control
햵PAN control (EMX-68S/CH1-4, EMX-88S/CH1-6)
BAL/PAN control (EMX-68S/CH5-6, EMX-88S/CH7-8)
햶LEVEL control
햷PAD switch (EMX-68S/CH1-4, EMX-88S/CH1-6)
•Digital Effect
햸PROGRAM selector
햹PARAMETER control
햺ON switch
햻TAP switch

8
EMX68S / EMX88S
햽
헂
헁
햾햿헀
헃
헄
헅
헆
21
22
23
24
25
햽Graphic Equalizer
햾EFFECT RTN control
햿AUX IN control
헀2TR IN control
헁MASTER control
헂Peak Level Indicator
•MAIN
•MONITOR
•PHANTOM switch, indicator
•POWER AMP
•YAMAHA SPEAKER PROCESSING
헃Graphic Equalizer
헄EFFECT RTN control
헅2TR IN control
헆MASTER control
21
Peak Level Indicator
22
PHANTOM ON/OFF switch
23
LIMITER indicator
24
Power Amp select switch
25
ON/OFF switch

9
EMX68S / EMX88S
26
27
햳햴 햶
햵햷햸 햹햲
햳햲
26
ON/OFF switch
27
POWER ON/OFF switch,
indicator
•STAND-BY •POWER switch, indicator
2. INPUT/OUTPUT SECTION
●REARPANEL
햲INPUT terminal (Low-Z)
(EMX-68S/CH1-4, EMX-88S/CH1-6)
햳INPUT terminal (Hi-Z)
(EMX-68S/CH1-2, EMX-88S/CH1-4)
햴INPUT terminal (Super Hi-Z)
(EMX-68S/CH3-4, EMX-88S/CH5-6)
햵INPUT terminal (MIC, LINE)
(EMX-68S/CH5-6, EMX-88S/CH7-8)
햶EFFECT OUT terminal
햷FOOT SW terminal
햸INPUT TO MAIN terminal (AUX IN, 2TR IN)
햹OUTPUT terminal (REC OUT, MAIN(STEREO),
MONITOR)
햲SPEAKERS terminal
햳AC IN socket

10
EMX68S / EMX88S
CIRCUIT BOARD LAYOUT & WIRING
MIX88
MIX68
PWR 3/4
PWR 3/4
PWR 4/4
PWR 4/4
DSP
PowerTransformer
PWR 2/4
PWR 1/4
PWR 2/4
MIX88
MIX68
PWR 1/4
DSP
CN106
CN107
CN903
CN104
CN901 CN101
CN101
CN105
PowerTransformer
AC INLET
DC Fan
POWER
ON/OFF
1
2
3
4
Location Connector Assembly Remarks Parts No.
1 MIX68/88-PWR1/4
24185&2426 15P L=700 V842620
2 MIX68/88-DSP 100mm P=1.25 MF12710
3 PWR1/4-PWR2/4 B&B4P (V827270)
4 PWR3/4-PWR4/4 PSW V827290
2P
6P
3P
3P
15P
15P
27P 27P

11
EMX68S / EMX88S
DIMENSIONS
305mm
481.5mm
448.5mm
327.6mm
62mm
●Front View ●Side View
●Front View with Rack Mount Adaptor

12
EMX68S / EMX88S
MIX88
MIX68
DSP
INPUT TO MAIN
FOOT SW
CH INPUT
EMX-68S [CH5,6]
EMX-88S [CH7,8]
CH INPUT
EMX-68S [CH3,4]
EMX-88S [CH5,6]
CH INPUT
EMX-68S [CH1,2]
EMX-88S [CH1-4]
EFFECT
ON/OFF
TAP
Low-Z
Low-Z
Hi-Z
Super Hi-Z
MIC
L/MONO
R
L/MONO
R
L
R
LINE
AUX IN
2TR IN
12
3
12
3
12
3
1
2
34
1
2
34
1
2
34
1
2
34
1
2
34
1
2
34
1
2
34
1
2
34
EMX-68S:IC101
EMX-88S:IC101,301 EMX-68S:IC103 EMX-88S:IC103,303
EMX-68S/88S:
IC503 EMX-68S/88S:
IC504
EMX-68S/88S:
IC102
EMX-68S/88S:
SW906
EMX-68S/88S:
IC502
EMX-68S/88S:IC501
EMX-68S/88S:IC704 EMX-68S/88S:
IC701,801 EMX-68S/88S:
IC702,802
EMX-68S/88S:
IC702,802
EMX-68S/88S:
IC701,801
EMX-68S/88S:IC703,803
EMX-68S/88S:IC703,803
EMX-68S/88S:IC901
EMX-68S/88S:IC901
EMX-68S/88S:IC902
EMX-68S/88S:IC902
EMX-68S/88S:EN901
EMX-68S/88S:VR905
EMX-68S/88S:
IC923
EMX-68S/88S:
IC923 EMX-68S/88S:I
C
EMX-68S/88S:
IC922
EMX-68S/88S:
IC922
EMX-68S/88S:
IC904
EMX-68S/88S:
IC921
EMX-68S/88S:
IC921
EMX-68S/88S:
IC903
EMX-68S/88S:
IC903 E
M
E
M
E
M
EMX-68S/88S:
IC920
EMX-68S/88S:
IC920
EMX-68S/88S:IC505
829
21-24 12-15
20 16
13 23 22
14
928 1027
18,19
20,21
CN101-27PIN
CN901-27PIN
CN901-27PIN
6
57
6
55
7
6
57
7
57
31
57
57
216767
216721
216767
216721
57
31
21
67
21
57
57
A
A’
BLOCK & LEVEL DIAGRAM

13
EMX68S / EMX88S
+
+
+
+
PWR 1/4
PWR 2/4 SPEAKERS
EFFECT OUT
MAIN L
MAIN R
MONITOR
REC OUT BRIDGE
1
2
A
1
2
B
1
2
34
1
2
34
1
2
34
1
2
34
EMX-68S/88S:
IC923
E
MX-68S/88S:
C
923 EMX-68S/88S:IC904 EMX-68S/88S:IC916
EMX-68S/88S:
IC922
E
MX-68S/88S:
C
922
EMX-68S/88S:
IC904
EMX-68S/88S:IC916
EMX-68S/88S:
IC921
M
X-68S/88S:
C
921
EMX-68S/88S:
IC903
EMX-68S/88S:
IC903
EMX-68S/88S:IC914
EMX-68S/88S:IC914
EMX-68S/88S:IC905,906
EMX-68S/88S:IC907,908
EMX-68S/88S:IC909,910
EMX-68S/88S:
IC920
M
X-68S/88S:
C
920
EMX-68S/88S:IC911
EMX-68S/88S:IC917,918
EMX-68S/88S:
IC917,918
EMX-68S/88S:IC912
EMX-68S/88S:SW904
EMX-68S/88S:SW905
EMX-68S/88S:IC915
EMX-68S/88S:IC915
EMX-68S/88S:IC913
CN903-15PIN CN101-15PIN
W101RE1
W101BE1
W101RE2
W101BE2
21676757
57
21672131
31
21676757
21672131
8
1,2,3,4,7
8
1,2,3,4,7
8
1,2,3,4,7
38CA1-8822109 1
PA
PA
A
A’

14
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. old 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)
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)
[80]
[80]
[90] [100]
Body Assembly
Front Panel Assembly
DSP
[170] [140]
[140]
[250] [270]
(Fig. 1)
[80]: Bind Head Screw 4.0X12 MFZN2BL (VB132700)
[90]: Bind Head Screw 4.0X20 MFZN2BL (VB403600)
[100]: Bind Head Screw A4.0X8 MFZN2BL (VP156800)
(Fig. 2)
[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)

15
EMX68S / EMX88S
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)
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)
Note: When placing the front panel assembly on
the table, take care not to weight the PWR
circuit board 4/4. (Fig.6)
DSP
PullPull
(Fig. 4)
[240]
Top View
Bottom View
(Fig. 3)
[240]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)

16
EMX68S / EMX88S
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) [100]: Bind Head Screw 3.0X8 MFZN2BL (VB659000)
[120]: Power Switch Knob MX12/4 (VU859000)
[50]
[70]
[60]
[80]
[90]
[70]
[60]
[80]
[90]
[60] [70] [90][90][50]
[40] [40] [40] [40] [40] [40] [40] [40] [40][40]
[60] [70] [90][90]
EMX88SEMX68S
[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)
(Fig. 5)
(Fig. 6)
[100][100]
[120]
[120]
(Fig. 7-2)

17
EMX68S / EMX88S
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. old the cord holder and pull the rear panel
forward to remove. (Fig.9)
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)
[240]
Rear Panel Assembly
(Fig. 10)
[240]: Bind Head Screw A4.0X8 MFZN2BL (VP156800)
[60]
[60][44]
[140][150b]
[130]
[150a]
[C]
[44]
(Fig. 8)
(Fig. 9)
[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)

18
EMX68S / EMX88S
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)
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.
PowerTransformer
FRONTVIEW
[D]
(Fig. 13) (Fig. 14)
Power Transformer
FRONT VIEW
Direction to lead
the cables
Upper Side View Bottom Side View
PWR 1/4 PWR 1/4
[90][90] [90]
[90]
[90]
[40] Rear Panel
(Fig. 12)
(Fig. 11) [40]: Bind Head Screw SP 3.0X8 MFZN2Y
(EG330290)
[90]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)

19
EMX68S / EMX88S
Body Assemb
Body Assemb
ly
Handle
Handle
[50] [50]
Body Assembly
Handle
[50] [50]
[40]
[40]
[40][40]
Body Assembly
(Fig. 15)
[50]: Bind Head Screw 4.0X16 MFZN2BL (EG340110)
(Fig. 16)
[40]: Bind Head Tapping Screw-P 4.0X30 MFZN2BL (V8322700)
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)

20
EMX68S / EMX88S
LSI PIN DESCRIPTION
●M30622MCA-XXXFP (X2416A00) CPU DSP: IC109
PIN PIN
NO. NAME I/O FUNCTION NO. NAME I/O FUNCTION
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 P51/WRH/BHE I/O CMOS 8Bit Input Output Port
6 P91/ I/O 46
P50/WRL/WR I/O CMOS 8Bit Input Output Port
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 I/O CMOS 8Bit Input Output Port 50 P44/CS0 I/O CMOS 8Bit Input Output Port
11 P86/X COUT I/O CMOS 8Bit Input Output Port 51 P43/A19 I/O
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/TA4IN/U I/O 61 P31/A9 I/O
22 P80/TA4OUT/U I/O 62 Vcc
23 P77/TA3IN I/O 63 P30/A8(/-/D7) I/O CMOS 8Bit Input Output Port
24 P76/TA3OUT I/O 64 Vss
25 P75/TA2IN/W I/O 65 P27/A7(D7/D6) I/O
26 P74/TA2OUT/W I/O CMOS 8Bit Input Output Port 66 P26/A6(/D6/D5) I/O
27 P73/ TA1IN/V I/O 67 P25/A5(/D5/D4) I/O
28 P72/CLK2/TA1OUT I/O 68 P24/A4(/D4/D3) I/O CMOS 8Bit Input Output Port
29 P71/RXD2 I/O 69 P23/A3(/D3/D2) I/O
30 P70/TXD2 I/O 70 P22/A2(/D2/D1) I/O
31 P67/TXD1 I/O 71 P21/A1(/D1/D0) I/O
32 P66/RXD1 I/O 72 P20/A0(/D0/-) I/O
33 P65/CLK1 I/O 73 P17/D15/INT5 I/O
34 P64/ RTS1 I/O CMOS 8Bit Input Output Port 74 P16/D14/INT4 I/O
35 P63/TXD0 I/O 75 P15/D13/INT3 I/O
36 P62/RXD0 I/O 76 P14/D12 I/O CMOS 8Bit Input Output Port
37 P61/CLK0 I/O 77 P13/D11 I/O
38 P60/CTS0/RTS0 I/O 78 P12/D10 I/O
39 P57/RDY/CLKOUT I/O CMOS 8Bit Input Output Port 79 P11/D9 I/O
40 P56/ALE I/O CMOS 8Bit Input Output Port 80 P10/D8 I/O
●YM3436DK (XG948E00) DIR2 (Digital Format Interface) DSP: IC103
PIN PIN
NO. NAME I/O FUNCTION NO. NAME I/O FUNCTION
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 Fsx 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 Channel status sampling frequency display output 1
12 XI I Crystal oscillator connection or external clock input 34 FS0 O Channel status sampling frequency display output 0
13 XO O Crystal oscillator connector 35 CSM I Channel status output method selection
14 P256 O VCO oscillating clock connection 36 EXTW I External synchronous auxiliary input word clock
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 Channel status emphasis control code output
20 DOM1 I Data output mode selection 42 CD0 O 3-wire type microcomputer interface data output
21 DOM0 I Data output mode selection 43 CCK I 3-wire type microcomputer interface clock input
22 KM1 I Clock mode switching input 1 44 CLD I 3-wire type microcomputer interface load input