SERVICE MANUAL
HAMAMATSU, JAPAN
1,387K-2101
Printed in Japan 2002.03
PA
011626
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 .................................................................................... 33
OVERALL CIRCUIT DIAGRAM
PARTS LIST
EMX66M
This document is printed on chlorine free (ECF) paper with soy ink.
• OPTION
RK-88 RACK MOUNT KIT
EMX66M 20020325-75000
RK88 20020325-2500
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2
EMX66M
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 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
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.
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EMX66M
SPECIFICATIONS
G General specifications
•
0 dB=0.775 Vrms
Maximum output power
300 W + 300 W/4Ω @0.5% THD at 1 kHz (SPEAKERS OUT A, B)
205 W + 205 W/8Ω @0.5% THD at 1 kHz (SPEAKERS OUT A, B)
600 W/8Ω @0.5% THD at 1 kHz (BRIDGE)
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 SEND)
Total harmonic distortion
Less than 0.5% @20 Hz–20 kHz, 150 W output into 4Ω (SPEAKERS OUT A, B)
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 (83 dB S/N)
MAIN OUT, MONITOR OUT
Master level control at nominal level and all channel
level controls at minimum.
–69 dB (73 dB S/N)
MAIN OUT, MONITOR OUT
Master level control at nominal level and 1 channel
level control at nominal level.
–75 dB (79 dB S/N)
EFFECT SEND
All channel level controls at minimum.
–69 dB (73 dB S/N)
EFFECT SEND
1 channel level control at nominal level.
Maximum voltage gain
88 dB CH IN (Low-Z) to SPEAKERS OUT (CH1–4)
66 dB CH IN (Low-Z) to MAIN OUT, MONITOR OUT (CH1–4)
72 dB CH IN (Low-Z) to EFFECT OUT (CH1–4)
48 dB CH IN (Low-Z) to REC OUT (CH1–4)
56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH1–4)
26 dB AUX IN to MAIN OUT
24 dB 2TR IN to MAIN OUT
66 dB MIC IN to MAIN OUT, MONITOR OUT (CH5•6)
26 dB LINE IN to MAIN OUT, MONITOR OUT (CH5)
46 dB Super Hi-Z IN to MAIN OUT, MONITOR OUT (CH6)
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 (–10, –5, 0, +3, +6 dB) (MAIN OUT, MONITOR OUT)
Graphic equalizer
7 bands (125, 250, 500, 1 k, 2 k, 4 k, 8 kHz), ±12 dB Maximum (MAIN OUT, MONITOR OUT)
Internal digital effect
8 programs (VO.ECHO 1, VO.ECHO 2, VO.REVERB 1, VO.REVERB 2, HALL 1, HALL 2, ROOM,
PLATE)
Phantom power
+15 V is supplied to electrically balanced inputs for powering condenser microphones via 2.4 kΩ
current limiting/isolation resisters.
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)
Foot switch (FC5)
DIGITAL EFFECT MUTE : on/off
Optional accessories
RK-88, FC5
Power requirement/Power
consumption
USA and Canada
120 V AC 60 Hz/250 W
Europe
230 V AC 50 Hz/300 W
Other
240 V AC 50 Hz/300 W
Dimensions (WxHxD)
482 x 305 x 328 mm
Weight
15 kg
Supplied accessories
AC power cord, Owner’s Manual
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EMX66M
G Input specificaitons
G Output specificaitons
Input connectors
PAD
Actual load
impedance
Nominal
impedance
Input level
Connector
type
Sensitivity1
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.
Nominal level
Max. before
cliping
CH INPUT (Low-Z)
(CH1–4)
OFF
3 kΩ
50–600Ω
Mics
–62 dB (0.616 mV)
–50 dB (2.45 mV)
–20 dB (77.5 mV)
XLR-3-31 type2
ON
600Ω Lines
–32 dB (19.5 mV)
–20 dB (77.5 mV)
+10 dB (2.45 V)
CH INPUT (Hi-Z)
(CH1–4)
OFF
10 kΩ
50–600Ω
Mics
–52 dB (1.95 mV)
–40 dB (7.75 mV)
–10 dB (245 mV)
Phone jack
(TRS)2
ON
600Ω Lines
–22 dB (61.6 mV)
–10 dB (245 mV)
+20 dB (7.75 V)
MIC INPUT (CH5•6)
3 kΩ
50–600Ω
Mics
–62 dB (0.616 mV)
–50 dB (2.45 mV)
–20 dB (77.5 mV)
XLR-3-31 type2
LINE INPUT (CH5) (1, 2)
10 kΩ
600Ω Lines
–22 dB (61.6 mV)
–10 dB (245 mV)
+20 dB (7.75 V)
Phone jack3
Super Hi-Z (CH6) (1, 2)
470 kΩ
1 kΩ
–42 dB (6.16 mV)
–30 dB (24.5 mV)
0 dB (0.775 V)
Phone jack3
AUX IN
10 kΩ
600Ω Lines
–22 dB (61.6 mV)
–10 dB (245 mV)
+20 dB (7.75 V)
Phone jack3
2TR IN (1, 2)
10 kΩ
600Ω Lines
–22 dBV (79.4 mV) –10 dBV (316 mV)
+17.8 dBV (7.76 V) RCA phono
jack3
•
All output jacks are unbalanced.
•
0 dB=0.775 Vrms, 0 dBV=1 Vrms.
Output connectors
Actual source
impedance
Nominal
impedance
Output level
Connector type
Nominal
Max. before cliping
POWER AMP OUT (1•2) (A, B)
0.1Ω
4/8Ω Speaker
60 W/4Ω
(300 W/4Ω)
Phone jack
BRIDGE OUT
0.1Ω
8Ω Speaker
120 W/8Ω
(600 W/8Ω)
Phone jack
MAIN 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
EFFECT OUT
600Ω
10 kΩ Lines
+4 dB (1.23 V)
+20 dB (7.75 V)
Phone jack
REC OUT (1, 2)
600Ω
10 kΩ Lines
–10 dBV (316 mV)
+10 dBV (3.16 V)
RCA phono jack
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EMX66M
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EMX66M
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EMX66M
PANEL LAYOUT
G CONTROL PANEL
1. CONTROL SECTION
• Channel Control
Equalizer (HIGH, MID, LOW)
MONITOR control
EFFECT control
LEVEL control
PAD switch (CH1-4)
• Digital Effect
EFFECT select switch
ON switch, indicator
1
PAD
—15
+15
1
HIGH
MID
LOW
LEVEL
MONITOR
EFFECT
—15
+15
—15
+15
0
+15
0
+15
0
10
1
2
3
4
5
DIGITAL
EFFECT
VOCAL ECHO 1
VOCAL ECHO 2
VOCAL
REVERB 1
VOCAL
REVERB 2
HALL 1
HALL 2
ROOM
PLATE
ON
EFFECT
6
7
1
2
3
4
5
6
7
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EMX66M
➇ Graphic Equalizer
EFFECT RTN control
➉ AUX IN control
2TR IN control
MASTER control
Peak Level Indicator
• MAIN
• MONITOR
• PHANTOM switch, indicator
• YAMAHA SPEAKER PROCESSING
Graphic Equalizer
EFFECT RTN control
2TR IN control
MASTER control
Peak Level Indicator
PHANTOM ON/OFF switch, indicator
ON/OFF switchÅ@
10
0
10
0
EFFECT RTN
2TR IN
GEQ
MASTER
+12
6
0
6
12
+12
6
0
6
12
125
250
500
1k
2k
4k
8k
+6
+3
0
-5
-10
10
0
10
0
MAIN
AUX IN
8
9
10
11
12
13
10
0
10
0
10
0
EFFECT RTN
2TR IN
GEQ
MASTER
+12
6
0
6
12
+12
6
0
6
12
125
250
500
1k
2k
4k
8k
+6
+3
0
-5
-10
MONITOR
14
15
16
17
18
POWER AMP
LIMITER
MON
MAIN
MAIN
MAIN
MAIN
BRIDGE
A
B
19
20
PHANTOM
ON
OFF
21
YAMAHA
SPEAKER
PROCESSING
22
• POWER AMP
LIMITER indicator
POWER AMP select switch
11
12
13
14
15
16
17
18
19
20
21
22
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EMX66M
• POWER switch, indicator
POWER ON/OFF switch, indicator
2. INPUT/OUTPUT SECTION
G REAR PANEL
INPUT terminal (Hi-Z, Low-Z)
(CH1-4)
INPUT terminal (LINE, MIC, Super Hi-Z)
(CH5-6)
EFFECT OUT terminal
FOOT SW terminal
INPUT TO MAIN terminal (AUX IN, 2TR IN)
OUTPUT terminal (REC OUT, MAIN, MONI-
TOR)
SPEAKERS terminal
AC IN socket
ON /
OFF
power
23
EEEngine
SEE REAR PANEL CAUTION
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Low-Z
Low-Z
Low-Z
Low-Z
LINE
MIC
MIC
Super Hi-Z
EFFECT OUT
FOOT SW
AUX IN
INPUT TO MAIN
OUT PUT
2TR
IN
REC
OUT
MAIN
MONITOR
ON /
OFF
1
2
3
4
5
6
1
2
1
2
1
1
2
2
B
BRIDGE
AC IN
2 1
2 1
SPEAKERS
B
A
1
2
23
1
2
3
4
5
6
1
2
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EMX66M
CIRCUIT BOARD LAYOUT & WIRING
PWR 3/4
PWR 4/4
PWR 2/4
MIX66
PWR 1/4
DSP
CN106
CN107
CN902
CN104
CN901
CN301
CN101
CN105
Power Transformer
AC INLET
DC Fan
POWER
ON/OFF
1
2
3
4
Location
Connector Assembly
Remarks
Parts No.
1
MIX66-PWR1/4
24185&2426 15P L=700
V842620
2
MIX66-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
MIX66
PWR 3/4
PWR 4/4
DSP
Power Transformer
PWR 2/4
PWR 1/4
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EMX66M
DIMENSIONS
305mm
481.5mm
448.5mm
327.6mm
62mm
G Front View
G Side View
G Front View with Rack Mount Adaptor
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EMX66M
BLOCK & LEVEL DIAGRAM
INPUT TO MAIN
FOOT SW
CH INPUT
[CH 6]
CH INPUT
[CH 1-4]
CH INPUT
[CH 5]
Low-Z
Hi-Z
Super Hi-Z
MIC
MIC
LINE
AUX IN
2TR IN
MIX66
DSP
1
2
3
1
2
3 4
1
2
3
1
2
3
1
2
3 4
1
2
3 4
1
2
3 4
1
2
3 4
1
2
3 4
1
2
3 4
IC101,301
IC501
IC601
IC603
IC603
IC501
IC502
IC502
IC703
IC703
IC901
IC704
IC704
IC601
IC706
IC306
IC102,302
CN901-27PIN
CN901-27PIN
CN301-27PIN
CN301-27PIN
7
14
21
7
20
8
5
6
14
21
12
13
16
15
3,5
1,7
2,6
SW101-401
SW702
2
3
1
5
7
2
3
1
5
7
5
7
3
1
5
7
6
7
6
7
2
1
6
7
2
1
A
A’
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EMX66M
+
+
+
+
PWR 1/4
PWR 2/4
EFFECT OUT
MONITOR
MAIN
REC OUT
SPEAKERS
BRIDGE
1
2
A
1
2
B
1
2
3 4
1
2
3 4
1
2
3 4
IC901
IC705
IC805,806
IC705
IC702
IC903
IC903
SW701
SW910
IC802
IC706
IC803,804
CN902-15PIN
CN101-15PIN
W101RE1
W101BE1
W101RE2
W101BE2
3
1
2
1
3
1
5
7
3
1
5
7
9
1,2,3,4,6
9
1,2,3,4,6
38CA1-8822111
PA
PA
A
A’
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EMX66M
DSP
[160]
[130]
[130]
[240]
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 panel to the front.
(Fig.1)
1-3.
Remove the screw marked [100]. The front panel
assembly can then be removed. (Fig.1)
(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)
2.
DSP-ZFX 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 [160] to
remove the shield case. (Fig.2)
2-3.
Remove the four (4) screws marked [130]. The
DSP-ZFX circuit board can then be removed. (Fig.2)
[130]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[160]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[240]: Cord Binder TS-0708 KSS (VZ765100)
[80]
[80]
[90]
[100]
Body Assembly
Front Panel Assembly
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EMX66M
3.
MIX66 Circuit Board
(Time required: about 18 min)
3-1.
Remove the front panel assembly. (See Procedure 1)
3-2.
Remove the cable from the cord binder marked
[240]. (Fig.2)
3-3.
Remove the shield case. (See Procedure 2-2)
3-4.
Pull out the connector assembly from CN301 on
the DSP-ZFX circuit board. (Fig.4)
3-5.
Remove the six (6) screws marked [230] to remove
the shield plate. (Fig.3)
3-6.
Remove the fifteen (15) screws marked [40], the
thirteen (13) screws marked [41], and the thirteen
(13) hexagonal nuts marked [A]. (Fig.5)
3-7.
Remove the eighteen (18) knobs marked [50], eight
(8) knobs marked [60], the nine (9) knobs marked
[70], and the eight (8) knobs marked [80].
The mix66 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)
[230] Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
(Fig. 4)
(Fig. 5)
[230]
Top View
Bottom View
DSP
Pull
Pull
[70]
[60]
[80]
[50]
[40]
[40]
[40]
[40]
[40]
[60]
[70] [90]
[A]
[A]
[41]
[41]
(Fig. 6)
[40]: Screw 3X25 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 L-GRAY/D-GRAY (V6225700)
[90]: Bind Head Screw 3.0X8 MFZN2BL (VB659000)
(Fig. 3)
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EMX66M
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, and pull it to the front to
remove. (Fig.7-1)
4-3.
Remove the two (2) screws marked [90]. (Fig.7-2)
4-4.
Remove the power switch knob marked [110]. The
PWR circuit board 4/4 can then be removed.
(Fig.7-2)
[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 Head Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
(Fig. 7-2)
(Fig. 8)
[90]:
Bind Head Screw 3.0X8 MFZN2BL (VB659000)
[110]: Power Switch Knob MX12/4 (VU859000)
[90]
[110]
[90]
[110]
[60]
[60]
[44]
[140]
[150b]
[130]
[150a]
[C]
[44]
(Fig. 7-1)
Pull
Pull
Push
Push
Push
Push
PWR 4/4
5.
Rear Panel Assembly
(Time required: about 2 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)
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EMX66M
(Fig. 9)
5-3.
Hold the cord holder and pull the rear panel to the
front to remove. (Fig.9)
Note: When reinstalling, install the rear panel
assembly and the front panel assembly in that order
to connect the power supply connector easily.
(Fig. 10)
[220]
Rear Panel Assembly
6.
PWR Circuit Board 2/4
(Time required: about 4 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 3 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 [220]. The PWR circuit
board 3/4 can then be removed. (Fig.10)
[220]: Bind Head Screw A4.0X6 MFZN2BL (VP156800)
Pull Up
Pull Up
Rear Panel Assembly
Rear Panel Assembly
Body Assembly
Body Assembly
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EMX66M
8.
PWR Circuit Board 1/4
(Time required: about 10 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 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
PWR 1/4
PWR 1/4
[90]
[90]
[90]
[90]
[90]
[40]
Rear Panel
(Fig. 11)
(Fig. 12)
[90]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ0746000)
[40]: Bind Head Screw SP 3.0X8 MFZN2Y (EG330290)
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EMX66M
9.
Fan (Time required: about 3 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)
Power Transformer
FRONT VIEW
[D]
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.14)
11-3. Remove the ten (10) screws marked [40]. The front
frame can then be removed. (Fig.15)
Body Assembly
Handle
[50]
[50]
Body Assembly
Handle
[50]
[50]
[40]
[40]
[40]
[40]
Body Assembly
[50]: Bind Head Screw 4.0X16 MFZN2BL (EG340110)
[40]: Bind Head Tapping Screw-P 4.0X30 MFZN2BL (V8322700)
(Fig. 14)
(Fig. 15)
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EMX66M
LSI PIN DESCRIPTION
PIN
No.
NAME
I/O
FUNCTION
PIN
No.
NAME
I/O
FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
ED2
ED3
ED4
ED5
ED6
ED7
VSS
VDD
CLKM0
CLKM1
TMS
TDI
TCK
CLKIN
VSS
VDD
CLKO
EA12/ED8
EA13/ED9
EA14/ED10
EA15/ED11
VSS
VDD
EA16/ED12
EA17/ED13
EA18/ES14
EA19/ED15
EA4/ED16
EA5/ED17
EA6/ED18
EA7/ED19
VSS
VDD
EA8/ED20
EA9/ED21
EA10/ED22
EA11/ED23
TEST0
TEST1
TEST2
TEST3
/BIO
/INT1
ARBC1
ARBC2
AX1
AX2
AX3
VSS
VDD
HX/SDA
/EMPTY
AXLR2
AR1
AR2
HRBCK/SA0
HR/SA1
HRS/SA2
VSS
VDD
HXBCK/SCL
HXS/SA3
/CS/SA4
HBCKS/SA5
I2CSEL
VSS
VDD
AXBC1
AXBC2
AXLR1
DIVS
/LAV
/LMV
/DRDY
EMU0
EMU1
TDO
DIV512
ARLR1
ARLR2
HDIR/SA6
SEL5V3V
/MUTE
/TRST
/RS
VSS
VDD
/IOE
/RAS/SRCS
/CAS/SROE
/ROME
/WE
EA0
EA1
EA2
EA3
VSS
VDD
ED0
ED1
I/O
I/O
I/O
I/O
I/O
I/O
S
S
I
I
I
I
I
I
S
S
O
I/O
I/O
I/O
I/O
S
S
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
S
S
I/O
I/O
I/O
I/O
I
I
I
I
I
I
I
I
O
O
O
S
S
I/O/Z
O/Z
I
I
I
I
I
I
S
S
I
I
I
I
I
S
S
I
I
I
O
O
O
O/Z
I/O/Z
I/O/Z
O/Z
O
I
I
I
I
I
I
I
S
S
O
O
O
O
O
O
O
O
O
S
S
I/O
I/O
ZFX-2 (XY297A00)CPU
DSP-ZFX: IC306
External Memory and I/O Data Bus
Ground
Power Supply
Clock Mode
TAP(Test Access Port) Mode Select
TAP Data Input
TAP Clock
Master Clock
Ground
Power Supply
Machine Clock Output
External SRAM and ROM Address Bus/
External DRAM and I/O Data Bus
Ground
Power Supply
External SRAM and ROM Address Bus/
External DRAM and I/O Data Bus
External Memory Address Bus/ External I/O
Data Bus
Ground
Power Supply
External Memory Address Bus/ External I/O
Data Bus
Test Mode Control
Separate Control Input
Interrupt 1
Audio Data Receive Unit 1 bit Clock
Audio Data Receive Unit 2 bit Clock
Audio Data Transmitt Unit 1 Data Output
Audio Data Transmitt Unit 2 Data Output
Audio Data Transmitt Unit 3 Data Output
Ground
Power Supply
Host Interface Data Output/I2C Bus Data
CMEM Update Buffer and HR Resistor Empty Flag Output
Audio Data Transmitt Unit 2/3 Left and
Right Channel Frame Frequency Signal
Audio Data Receive Unit 1 Data Input
Audio Data Receive Unit 2 Data Input
Host Interface Receive Clock / I2C Bus Address 0
Host Interface Data Input/ I2C Bus Address 1
Host Interface Receive Data Frame
Frequency Signal/ I2C Bus Address 2
Ground
Power Supply
Host Interface Transmitt Clock/ I2C Bus Clock
Host Interface Transmitt Data Frame
Frequency Signal/ I2C Bus Address 3
Host Interface Chip Select/ I2C Bus Address 4
HRBCK/HXBCK Active Edge Select/ I2C Bus Address 5
Host Interface Mode Select
Ground
Power Supply
Audio Data Transmitt Unit 1 bit Clock
Audio Data Transmitt Unit 2/3 bit Click
Audio Data Transmitt Unit 1 Left and Right
Channel Frame Frequency Signal
Machine Clock Output then 8 min.
Ruch ALU Overflow Frag Output
Ruch MAC Overflow Frag Output
Host Interface Transmitt Data Ready Frag Output
Emurator Interrupt 0
Emurator Interrupt 1
TAP(Test Access Port) Data Output
Machine Clock then512 min.
Audio Data Receive Unit 1 Left and Right
Channel Frame Frequency Signal
Audio Data Receive Unit 2 Left and Right
Channel Frame Frequency Signal
Host Interface Data Format Select/ I2C Bus Address 6
Input Level Control
Mute Control
TAP(Test Access Port) Reset
Hardware Reset
Ground
Power Supply
External I/O Enable
External DRAM Low Address Strove/External
SRAM Chip Select
External DRAM Culumn Address Strove/External
SRAM Output Enable
External ROM Enable
External Memory and I/O Wright Enable
External Memory and I/O Address Bus
Ground
Power Supply
External Memory and I/O Data Bus
CLKM0
CLKM1
1
0
0
3
1
0
6
0
1
PLL BYPASS
1
1
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EMX66M
PIN
No.
NAME
I/O
FUNCTION
PIN
No.
NAME
I/O
FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
P12/ANI2
P13/ANI3
P14/ANI4
P15/ANI5
P16/ANI6
P17/ANI7
P72/SCK2/ASCK
P71/SO2/TXD
P70/SI2/RXD
P101/T16/T06
P100/T15/T05
P50
P51
P52
P53
P54
VSS
P55
P56
P57
P30
P31
NC
P32
P33
P34
P35/PCL
P36/BUZ
P37
P00
P01/INTP1
P02/INTP2
P03/INTP3
NC
RESET
IC(VPP)
X2
X1
VDD
AVDD
AVREF
AVSS
P10/ANI0
P11/ANI1
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
-
I/O
I/O
I/O
I/O
I/O
I/O
I
I/O
I/O
I/O
-
I
-
-
I
-
-
I
-
I/O
I/O
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
Port 7. 3 bits input/output port./Serial clock
input/output of serial interface./Serial clock
input for asynchronus serial interface.
Port 7. 3 bits input/output port./Serial data output for serial
interface./Serial data output for asynchronus serial interface.
Port 7. 3 bits input/output port./Serial data input of serial
interface./Serial data input for asynchronus serial interface
Port 10. 2 bits input/output port./External count
clock input to 8 bits timer(TM6)./8 bits timer output.
Port 10. 2 bits input/output port./External count
clock input to 8 bits timer(TM5)./8 bits timer output.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 5. 8 bits input/output port.
Port 3. 8 bits input/output port.
Port 3. 8 bits input/output port.
Not connect.
Port 3. 8 bits input/output port.
Port 3. 8 bits input/output port.
Port 3. 8 bits input/output port.
Port 3. 8 bits input/output port./Clock output.
Port 3. 8 bits input/output port./Buzzer output.
Port 3. 8 bits input/output port.
Input only
4 bits input/output port./Effective edge (Rising
edge, falling edge, both rising and falling
edges) specifiable external interrupt input.
4 bits input/output port./Effective edge (Rising
edge, falling edge, both rising and falling
edges) specifiable external interrupt input.
4 bits input/output port./Effective edge (Rising
edge, falling edge, both rising and falling
edges) specifiable external interrupt input.
Not connect
System reset input
Internal connect
Main system clock oscillator X’tal
Main system clock oscillator X’tal
Power Supply
A/D Converter Analog Power Supply
A/D Converter Power Supply Input
A/D Converter ground
8 bits input/output port./A/D converter analog input.
8 bits input/output port./A/D converter analog input.
UPD78082GB-XXX (XY296A00) MCU
DSP-ZFX: IC303
PIN
No.
NAME
I/O
FUNCTION
PIN
No.
NAME
I/O
FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VINL
Vcc1
AGND1
VREFL
VREFR
VINR
CINPR
CINNR
CINNL
CINPL
VCOM
VOUTR
AGND2
Vcc2
VOUTL
LRCIN
BCKIN
DIN
DOUT
XTI
XTO
CLKIO
VDD
DGND
FMT2
FMT1
FMT0
RSTB
I
I
O
O
I
I
I
O
I
O
I/O
I
I
I
I
PCM3001E/2K (X0053A00) ADA
ADC Analog Input, Lch
ADC Analog Power Supply
ADC Analog GND
ADC Reference decouple, Lch
ADC Reference Decouple, Rch
ADC Analog Input, Rch
ADC Anti-areasing Filter Capacitor (+), Rch
ADC Anti-areasing Filter Capacitor (-), Rch
ADC Anti-areasing Filter Capacitior (-), Lch
ADC Anti-areasing Filter Capacitor (+), Rch
DAC Center Voltage Decouple
DAC Analog Output, Rch
DAC Analog GND
DAC Analog Power Supply
DAC Analog Output, Lch
Sampling Clock Input (fs)
Bit Clock Input
Audio Data Input
Audio Data Output
Crystal Oscillator Input, External System Clock Input
Crystal Oscillator Output
Crystal Oscillator Buffer Output, External System Clock Input
Digital Power Supply
Digital GND
Audio Data Format 2 (Pull up to 70k ohm typical)
Audio Data Format 1 (Pull up to 70k ohm typical)
Audio Data Format 0 (Pull up to 70k ohm typical)
Reset Input, Active "L" (Pull up to 70k ohm typical)
DSP-ZFX: IC305
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EMX66M
IC BLOCK DIAGRAM
74HCU04DT (XZ110A00)
INVERTER
DSP-ZFX: IC302
1
1A
2
3
4
5
6
7
1Y
2A
2Y
3A
3Y
VSS
8
9
10
11
12
13
14
VDD
6A
6Y
5A
5Y
4A
4Y
TC74HC138AFEL (XW762A00)
3 to 8 Demultiplexer
1
2
3
4
5
6
7
A
A
Select
Enable
Output
Output
B
B
C
C
G2A
G2A
G2B
G2B
G1
G1
Y7
Y7
Y5
Y4
Y3
Y2
Y1
Y0
Y6
16
15
14
13
12
11
10
Vcc
YO
Y1
Y2
Y3
Y4
Y5
8
GND
9
Y6
MIX66: IC902
NJM2060M(TE2)OP (XM560A00)
Quad Operational Amplifier
MIX66: IC803, IC804, IC805, IC806
NJM4558MT-1 (IG103520)
Dual Operational Amplifier
NJM2068MD-T1 (XJ553A00)
TL072CPSR (XV423A00)
1
2
3
4
-V
8
7
6
5
Output A
+V
Non-Inverting
Input A
-DC Voltage Supply
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
Inverting
Input A
+
-
+
-
MIX66: IC101, IC102, IC301, IC302
IC501, IC601, IC603, IC703
IC704, IC705, IC706, IC707
IC807, IC901, IC903
DSP-ZFX: IC304
LB1403N (XZ348A00)
LED Driver
D1
+
+
+
+
+
+
Constant
Current
Circuit
1
D2
2
D3
3
D4
4
GND
5
D5
6
Amp
Output
7
IN
8
VCC
9
MIX66: IC702, IC802
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EMX66M
CIRCUIT BOARDS
CONTENTS
MIX66 CIRCUIT BOARD (COMPONENT SIDE) .................................................................................................24
MIX66 CIRCUIT BOARD (PATTERN SIDE) ........................................................................................................26
DSP CIRCUIT BOARD (COMPONENT SIDE) ....................................................................................................28
DSP CIRCUIT BOARD (PATTERN SIDE) ...........................................................................................................29
PWR 1/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................30
PWR 2/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................32
PWR 3/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................32
PWR 4/4 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................32
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EMX66M
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
HIGH
MID
LOW
MONITOR
EFFECT
LEVEL
PAD
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Low-Z
Low-Z
Low-Z
Low-Z
MIC
MIC
Super Hi-Z 1
Super
Hi-Z 2
LINE 1
LINE 2
ON
VOVA
VOVA
VOVA
VOVA
A
A'
G MIX66 Circuit Board
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EMX66M
EFFECT OUT
FOOT SW
AUX IN
2TR IN 1
2TR IN 2
REC OUT 1
REC OUT 2
MAIN
MONITOR
POWER
+6
+3
0
-5
-10
+6
+3
0
-5
-10
YAMAHA
SPEAKER
PROCESSING
POWER AMP
MODE
PHAMTOM
ON / OFF
MONITOR
GRAPHIC
EQUALIZER
MAIN GRAPHIC
EQUALIZER
EFFECT RTN
EFFECT RTN
AUX IN
2TR IN
2TR IN
MASTER
MASTER
ON
VOVAL ECHO 1
VOVAL ECHO 2
VOVAL REVERB 1
VOVAL REVERB 2
HALL 1
HALL 2
ROOM
PLATE
to DSP-CN301
to PWR1/4-CN101
A
A'
A
B
Component side
3NA-V826690 1
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EMX66M
A
A'
G MIX66 Circuit Board
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EMX66M
A
A'
Pattern side
3NA-V826690 1
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EMX66M
to MIX66-CN901
G DSP Circuit Board
Component side
3NA-V826710 1
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EMX66M
Pattern side
3NA-V826710 1
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EMX66M
to PWR2/4-W101BE2
to PWR
to PWR2/4-W101RE2
to PWR1/4-W103OR1
to MIX66-CN902
A
A'
G PWR 1/4 Circuit Board
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EMX66M
to PWR1/4-W103OR2
to FAN Assembly
to Power Tranceformer
to PWR2/4-W101BL2
to PWR2/4-W101WH2
A
A'
Component side
3NA-V826900 1
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EMX66M
to PWR 1/4-W101RE1
to PWR 1/4-W101BE1
to PWR 1/4-W101BL1 to PWR 1/4-W101WH1
BRIDGE
SPEAKERS
1
2
1
2
A
B
G PWR 2/4 Circuit Board
Component side
AC IN
to Power Tranceformer
to PWR 4/4-CN107
Component side
G PWR 3/4 Circuit Board
ON / OFF
to PWR 3/4-W102YE/W102BR
G PWR 4/4 Circuit Board
Component side
PWR 2/4: 3NA-V826900 1
PWR 3/4: 3NA-V826900 1
PWR 4/4: 3NA-V826900 1
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EMX66M
INSPECTIONS
0.
PREPARATION
(1) Mesuring instruments
• Oscillator (Ballance output type, Output impedance 150Ω)
• Oscilloscope (Input impedance 100kΩ)
• Level meter (Input impedance 100kΩ)
• Distortion Meter
(2) Notes for mesuring
• Noise level must be mesured by using DIN AUDIO FILTER.
• 0dB is equal to 0.775V.
1.
Power Indicator Check
Confirm that the power indicator LED lights up while the power is ON.
2.
Mixer Check
2.1
Preparation
• Except otherwise indicated, input signal should be 1kHz sine curve and output impedance of signal source should be 150Ω.
• Connect the load of 10kΩ to MAIN OUT, MONITOR OUT, EFFECT OUT and REC OUT terminal.
• Set each control as follows.
CH INPUT 1-4
EQ (HIGH, MID, LOW) level control:
CENTER
MONITOR level control:
MAX
EFFECT level control:
MAX
LEVEL control:
MAX
PAD switch:
OFF
CH INPUT 5-6
EQ (HIGH, MID, LOW) level control:
CENTER
MONITOR level control:
MAX
EFFECT level control:
MAX
LEVEL control:
MAX
EFFECT
DIGITAL EFFECT ON switch:
OFF
MAIN
GRAPHIC EQUALIZER (7 band) fader:
CENTER
EFFECT RTN level control:
MAX
AUX IN level control:
MAX
2TR IN level control:
MAX
MASTER (MAIN) level control:
MAX
MONITOR
GRAPHIC EQUALIZER (7 band) fader:
CENTER
EFFECT RTN level control:
MAX
2TR IN:
MAX
MASTER (MAIN) level control:
MAX
PHANTOM switch:
OFF
YAMAHA SPEAKER PROCESSING switch: OFF
POWER AMP switch:
MAIN-MONITOR
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EMX66M
2.2
Gain Check
On condition of 2.1, confirm that the output level of each terminal meets the table 2.2-1.
Table 2.2-1
[unit: dBs]
INPUT
INPUT LEVEL
MAIN OUT(L,R)
MONITOR OUT
EFFECT OUT
REC OUT
Low-Z
-62
+4±2
+4±2
+4±2
-13.8±2
MIC
-32 (PAD ON)
Hi-Z
-52
+4±2
-
-
-
LINE
-22
+4±2
-
-
-
Super Hi-Z
-42
+4±2
-
-
-
AUX
-22
+4±2
-
-
-
2TR
-22
+4±2
-
-
-
2.3
Frequency Characteristic Check
At each terminal of the Table 2.2-1, confirm that the output level for 20Hz, 20kHz signal are within +1, -3dB from the level for
1kHz signal.
2.4
EQ Response Characteristic Check
On condition of 2.1, set the LOW, MID, HIGH controls according to the table 2.4-1, and mesure the output level of MAIN OUT
and MONITOR OUT.
Then confirm that output level variations from center click position meet the table 2.4-1.
When output level does not meet the table, change the input frequency until the output level meets the table.
If the frequency variation is within ±20% of the rated value, the rusult can be regarded as OK.
Table 2.4-1
[unit: dB]
EQ
VR Setting
INPUT FREQUENCY
RANGE OF VARIATION
HIGH
MAX
10kHz
+12±2
MIN
-12±2
MID
MAX
2.5kHz
+14±2
MIN
-14±2
LOW
MAX
100Hz
+12±2
MIN
-12±2
2.5
GEQ Response Characteristic Check
On condition of 2.1, set the GEQ faders to MIN or MAX, and mesure the output levels of MAIN OUT and MONITOR OUT.
Then confirm that output level variations from center click position meet the table 2.5-1.
When the output level does not meet the table, change the input frequency until the output level meets the table.
If the frequency variation is within ±20% from the rated value, the result can be regarded as OK.
Table 2.5-1
[unit: dB]
125
250
500
1k
2k
4k
8k
INPUT FREQUENCY
125Hz
250Hz
500Hz
1kHz
2kHz
4kHz
8kHz
Variations
(for fader MAX)
+12±2
(for fader MIN)
-12±2
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EMX66M
2.6
LED Meter Check
When the output level of MAIN OUT and MONITOR OUT meets the Table 2.6-1, confirm that the corresponding LED meter
starts to light up.
Table 2.6-1
[unit: dBs]
LED
+6
+3
0
-5
-10
OUTPUT LEVEL
+10±2
+7±2
+4±2
-1±2
-6±2.5
2.7
Distortion Rate Check
On condition of 2.1, set the INPUT and MASTER volume for each terminal to nominal position.
Then, confirm that the distortion rate is within 0.3% when the output level is +14dBs. (except REC OUT)
2.8
Maximum Output Level Check
At MAIN OUT, MONITOR OUT, EFFECT OUT terminals on condition of 2.7, confirm that the output level of +20dBs can be
gained with the distortion rate less than 1%.
2.9
EIN Check
Note: This mesurement should be performed by using DIN AUDIO FILTER.
On condition of 2.1, set the LEVEL control for mesuring channel to maximum and set the LEVEL control for other channels to
minimum.
Connect the 150Ω load between the Low-Z and the MIC of input channel, and confirm that the noise level of MAIN OUT is less
than -58dB.
However, less than -56dB as for CH6.
If noise level is more than the rated value, find the noise level converted from the input level for each channel.
Then confirm that the noise level is less than -124dB as for CH1-5, and less than -122dB as for CH6.
2.10
Remaining Noise Check
On condition of 2.1, set the LEVEL control of all input channels to minimum.
Set the MASTER control of MAIN and MONITOR to maximum or minimum, and mesure the noise level of MAIN OUT,
MONITOR OUT, and EFFECT OUT.
Then, confirm that the noise levels are less than the values shown in the table 2.10-1.
Table 2.10-1
[unit: dB]
MASTER VR
MAIN OUTPUT(L,R)
MONITOR OUTPUT
EFFECT OUT
MAX
-71
-71
-73
MIN
-88
-88
-
2.11
PHANTOM Check
Connect the 2.7kΩ load between the pin1 and pin2 of Low-Z or MIC, and short-circuit the pin2 and pin3 of them.
Then, confirm that the load voltage is 10±1.5V when the PHANTOM switch is ON.
2.12
DIGITAL EFFECT Check
• Turn on the power with VOCAL ECHO1 and ON switch pressed and held, and confirm that the ON LED blinks.
• Set EFFECT level control, LEVEL control, MASTER of MONITOR, and EFFECT of MONITOR to maximum.
Apply -48dBs / 1kHz signal into CH6 Super Hi-Z and mesure the output level of MONITOR OUT.
• Select the PROGRAM switch according to the Table 2.12-1 and confirm that the output level meets the table.
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EMX66M
Table 2.12-1
EFFECT
OPERATION
OUTPUT level (MONITOR OUTPUT)
VOCAL ECHO 1
Press the ON switch
No output [DIN AUDIO] -48dBs
VOCAL ECHO 2
Set the LEVEL to minimum
No output [DIN AUDIO] -48dBs
VOCAL REVERB 1
-
Recognizable
VOCAL REVERB 2
-
No output [DIN AUDIO] -48dBs
HALL 1
Switch the FOOT SW
Less than -30 dBs [DIN AUDIO] or full output
HALL 2
-
No output [DIN AUDIO] -48dBs
ROOM
-
Decays 4.2±1 dBs from the full output
PLATE
-
Full output; 10±3 dBs
• When each PROGRAM switch is pressed, confirm that the corresponding LED lights up.
• Apply the music source (vocal etc), and confirm the effect aurally.
2.13
Stability Check
Note: This mesurement should be performed with a load resistance connected to power amplifier output. (See 3.1.1)
• At each input terminal, connect 10pF~0.1µF capacitor in parallel to the load resistance, and confirm that the system works
normally without oscillation etc.
• Set all VR and EQ faders to maximum, and confirm that the system works normally. (Especially, does not oscillate when the EQ
HIGH is set to maximum)
3.
Power Amplifier Check
3.1
For the case that the POWER AMP switch is 'MAIN-MONITOR' or 'MAIN-MAIN'
3.1.1 Preparation
• INPUT terminal: CH 5 LINE 1
• POWER AMP switch: MAIN-MAIN
• OUTPUT terminal: SPEAKERS A1, SPEAKERS B1
• Load Resistance: 4Ω (more than 300W)
Except otherwise indicated, the load resistance should be connected only for the power amplifier check.
• Set the LEVEL control of CH1-4, 6 to minimum.
• Except the above, same as the setting of 2.1.
3.1.2 Power ON Mute Check
Turn on the power and confirm that the mute system is released and the relay is switched on after 2.5±1 seconds.
3.1.3 Output Terminal D.C. Voltage Check
Ground input terminal and confirm that the D.C. voltage of output terminal is 0±100mV.
3.1.4 Gain Check
• Apply -26dBs signal into the input terminal and confirm that the output level of 20.0±2.0dBs can be gained.
• Set the POWER AMP switch to ’MAIN-MON’ and confirm that the same output level can be gained at SPEAKERS A2, B2
output.
3.1.5 Frequency Response Check
• YAMAHA SPEAKERS PROCESSING Switch OFF
Apply -26dBs signal info input terminal, and confirm that the output level for 20Hz, 20kHz signal are within +1, -3dB from the
level for 1kHz signal.
• YAMAHA SPEAKERS PROCESSING Switch ON
Apply 70Hz / -26dB signal into input terminal, and confirm that the output level is within 6.5±2dB from the level for 1kHz input
with YAMAHA SPEAKERS PROCESSING switch OFF.
Besides, confirm that the LED lights up when YAMAHA SPEAKERS PROCESSING switch is ON and that LED goes out when
the switch is OFF.
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EMX66M
3.1.6 Harmonic Distortion Rate Check
Note: This mesurement should be finished in 30 seconds.
• Apply 1kHz signal into input terminal, and confirm that output level of 300W/4Ω (33.0dBs) can be gained with harmonic
distortion rate less than 0.5%.
• Apply 20Hz, 1kHz and 20kHz signal into input terminal, and confirm that harmonic distortion rate is less than 0.5% as for 20Hz
and 1kMz, less than 0.7% as for 20kHz when output level of 150W/4Ω (30.0dBs) can be gained.
3.1.7 Remaining Noise Check
Set the MASTER (MAIN) and the MASTER (MONITOR) to minimum, and confirm that the noise level of output terminal is less
than -65dB.
Note: Take care not to be affected by inductive noise.
This mesurement should be performed by using DIN AUDIO FILTER.
3.1.8 Stability Check
(1) Connect 10pF~0.47µF capacitor in parallel to the 4Ω load resistance and apply rectangule signal of 10kHz/-26dBs.
Then, confirm that overshoot and ringing are as follows.
Overshoot: Vp/Vo 1.8
Ringing: within 5 waves
(2) Connect 10µH~0.47H inductor in series to the 4Ω load resistance and apply rectangule signal of 10kHz/-26dBs.
Then, confirm that overshoot and ringing meet the same condition as (1).
(3) Remove the 4Ω load resistance and connect only 10pF~0.47µF capacitor as load, and apply rectangule signal of 10kHz/-
26dBs.
Then confirm that the system does not oscillate.
Besides, confirm that overshoot and ringing are as follows.
Overshoot: Vp/Vo 2.5
Ringing: within 7 waves
3.1.9 Protection Circuit Check
(1) Apply 10Hz signal until output level is saturated, and confirm that the protection circuit works and the relay does not open.
(2) Apply 1Hz, Vp-p = 6V(8.7dBs) signal, and confirm that the protection circuit starts to work in 2 seconds to cut off the signal.
(3) Stop applying the input signal, and confirm that the system automatically resumes in 5 seconds.
3.1.10 PC LIMITER Circuit and LIMITER Circuit Check
(1) Connect 1Ω (±5%, 100W) load and apply -20dBs signal into input terminal.
(2) Confirm that the protection circuit starts to work and indicator LED lights up.
(3) Stop applying the input signal, and confirm that the system automatically resumes in 5 seconds.
3.1.11 LIMITER Indicator Check
Apply 1kHz/-10.8dBs signal, and confirm that LIMITER indicator lights up.
3.1.12 Efficiency Check
Apply 1kHz/-24dB signal into input terminal, and confirm that the primary power is 180±50W.
If the primary power does not meet the rated value, adjust the input level until the output level of SPEAKERS becomes
12.2V(24.0dBs).
<__
<__
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EMX66M
3.2
For the case that the POWER AMP switch is 'MAIN BRIDGE'
3.2.1 Preparation
• POWER AMP switch: MAIN BRIDGE
• INPUT terminal: CH 5 LINE 1
• MASTER (MAIN): MAX
• OUTPUT terminal: BRIDGE
• Load Resistance: 8Ω(more than 600W)
Except otherwise indicated, the load resistance of SPEAKER should
be connected only for the amplifier check.
• LEVEL control of CH1-4, 6: MIN
• Except the above, same as the setting of 2.1
3.2.2 Gain Check
Apply -26.0dB signal into input terminal, and confirm that the output level of 22.0±2 dBs can be gained.
3.2.3 Frequency Response Check
Apply -26.0dBs signal into input terminal, and confirm that the output level for 20Hz, 20kHz signal are within +1, -3dB from the
level for 1kHz signal.
4.
Miscellaneous
4.1
Power Supply Voltage Variation
Change the voltage of power supply in the range of ±10%, and confirm that the system works normally.
T
S
meter
Input
GND
Speaker
Terminal
Resistor
Resistor
4Ω
4Ω
Level
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9
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9
9
2
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9
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2
9
8
0
5
1
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1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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40
EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
41
EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
42
EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
43
EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
44
EMX66M
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
EMX66M
EMX66M
EMX66M
A
B
C
D
E
F
G
H
1
2
3
4
5
EMX66M