SERVICE MANUAL
HAMAMATSU, JAPAN
1,387K-939
Printed in Japan 2002.03
PA
011627
CONTENTS
SPECIFICATIONS .............................................................................. 3
PANEL LAYOUT.................................................................................. 7
CIRCUIT BOARD LAYOUT & WIRING
.......................................................................................................... 10
DIMENSIONS ....................................................................................11
BLOCK & LEVEL DIAGRAM............................................................. 12
DISASSEMBLY PROCEDURE ......................................................... 14
LSI PIN DESCRIPTION .................................................................... 19
IC BLOCK DIAGRAM........................................................................ 20
CIRCUIT BOARDS ........................................................................... 21
INSPECTION .................................................................................... 29
OVERALL CIRCUIT DIAGRAM
PARTS LIST
EMX62M
This document is printed on chlorine free (ECF) paper with soy ink.
• OPTION
RK-88 RACK MOUNT KIT
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2
EMX62M
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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EMX62M
SPECIFICATIONS
G General specifications
Maximum output power
135 W/8Ω @0.5% THD at 1 kHz (SPEAKERS OUT)
200 W/4Ω @0.5% THD at 1 kHz (SPEAKERS OUT)
175 mW/40Ω @0.5% THD at 1 kHz (PHONES OUT)
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, 100 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, –68 dB residual output noise (SPEAKERS OUT)
–88 dB residual output noise (MAIN OUT, MONITOR OUT)
–79dB (83 dB S/N)
(MAIN OUT, MONITOR OUT)
Master level control: nominal level
Channel level controls: minimum
–69 dB (73 dB S/N)
(MAIN OUT, MONITOR OUT)
Master level control: nominal level
1 channel level control: nominal level
–75 dB (79 dB S/N)
(EFFECT OUT)
All channel level controls: minimum
–69 dB (73 dB S/N)
(EFFECT OUT)
1 channel level control: nominal level
Maximum voltage gain
86 dB CH IN (Lo-Z) to SPEAKERS OUT (CH1–4)
66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT (CH1–4)
66 dB CH IN (Lo-Z) to EFFECT OUT (CH1–4)
48 dB CH IN (Lo-Z) to REC OUT (CH1–4)
56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH1–4)
26 dB LINE IN to MAIN OUT (CH5)
26 dB AUX IN to MAIN OUT
22 dB 2TR IN to MAIN OUT
46 dB Super Hi-z IN to MAIN 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 *
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
Graphic equalizer
7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz) MAIN OUT
±12 dB Maximum
Internal digital effect
3 programs (VOCAL REVERB, LARGE HALL, SMALL HALL)
Phantom power
+15 V (balanced input)
Limiter
Comp. : THD≥0.5% (SPEAKERS OUT)
LIMIT indicator
Turn 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
USA and Canada: 120 V AC 60 Hz
Europe:
230 V AC 50 Hz
Other:
240 V AC 50 Hz
Power consumption
110 W
Dimensions (WxHxD)
482 x 305 x 328 mm
Weight
12 kg
Supplied accessories
AC power cord, Owner’s Manual
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EMX62M
G Input specificaitons
G Output specificaitons
Input connectors
PAD
Actual load
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 cliping
CH INPUT (Lo-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
type*2
*2. Balanced.
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)
LINE IN (CH5) (1–2)
10 kΩ
600Ω Line
–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.
Super Hi-Z IN (CH6) (1–2)
470 kΩ
1kΩ
–42 dB (6.16 mV)
–30 dB (24.5 mV)
0 dB (0.775 V)
Phone jack*3
AUX IN
10 kΩ
600Ω Line
–22 dB (61.6 mV)
–10 dB (245 mV)
+20 dB (7.75 V)
Phone jack*3
2TR IN (1–2)
10 kΩ
600Ω Line
–22 dBV (79.4 mV)
–10 dBV (316 mV)
+17.8 dBV (7.76 V)
Phono jack
• PHONE 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
SPEAKERS OUT (1, 2)
0.1Ω
4/8Ω Speaker
40 W/4Ω
200 W/4Ω
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
PHONES OUT
35Ω
40 Ω Phones
33 mW
175 mW
Phone jack
REC OUT (1, 2)
600Ω
10 kΩ Lines
–10 dBV (316 mV)
+10 dBV (3.16 V)
Phono jack
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EMX62M
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EMX62M
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EMX62M
PANEL LAYOUT
G CONTROL PANEL
1. CONTROL SECTION
• Channel Control
x Equalizer (HIGH, LOW)
➁ MONITOR control
➂ EFFECT control
√ LEVEL control
➄ PAD switch (CH1-4)
• Digital Effect
≈ EFFECT select switch
∆ ON switch, indicator
x
➁
➂
➃
➄
➅
➆
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EMX62M
17
➇ Graphic Equalizer
EFFECT RTN control
➉ AUX IN control
2TR IN control
MASTER control
Peak Level Indicator
LIMITER indicator
• MAIN
• MONITOR
• PHANTOM switch, indicator
• YAMAHA SPEAKER PROCESSING
• POWER switch, indicator
EFFECT RTN control
MASTER control
PHANTOM ON/OFF switch
POWER ON/OFF switch, indicator
➇
10
11
12
13
14
15
16
18
19
ON/OFF switch
11
12
13
14
15
16
17
18
19
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EMX62M
2. INPUT/OUTPUT SECTION
G REAR PANEL
INPUT terminal (Hi-Z, Low-Z)
(CH1-4)
INPUT terminal (LINE 1, 2)
(CH5)
INPUT terminal (Super Hi-Z)
(CH6)
EFFECT OUT terminal
FOOT SW terminal
INPUT TO MAIN terminal (AUX IN)
INPUT TO MAIN terminal (2TR IN)
OUTPUT terminal (REC OUT)
OUTPUT terminal (MAIN)
OUTPUT terminal (MONITOR)
OUTPUT terminal (PHONES)
SPEAKERS 1, 2 terminal
AC IN socket
2
1
1
2
3
5
6
7
8
9
10
11
4
1
2
3
4
5
6
7
8
9
10
11
1
2
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EMX62M
CIRCUIT BOARD LAYOUT & WIRING
PWR 3/3
MIX62 2/2
PWR 2/3
PWR 1/3
CN103
CN107
CN903
CN104
CN101
Power Transformer
AC INLET
POWER
ON/OFF
1
2
3
Location
Connector Assembly
Remarks
Parts No.
1
MIX621/2-PWR1/3
2426&2426 14P L=700
(V842610)
2
PWR1/3-PWR2/3
B&B2P
(V828330)
3
PWR3/3-MIX622/2
PSW
V8272900
6P
3P
3P
15P
15P
MIX62 1/2
PWR 3/3
PWR 1/3
MIX62 2/2
MIX62 1/2
PWR 2/3
Power Transformer
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EMX62M
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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EMX62M
BLOCK & LEVEL DIAGRAM
INPUT TO MAIN
FOOT SW
CH INPUT
CH6
CH INPUT
CH5
CH INPUT
CH1-4
Low-Z
Hi-Z
1
2
1
2
LINE
1
AUX IN
2TR IN
Super Hi-Z
2
(MUTE)
MIX62
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
1
2
3 4
IC101,201
SW401
IC301
2,6
3,5
1,7
3
1
IC302
3
1
IC303
5
7
IC303
IC507
SW501
SW503
SW101-102
SW201-202
3
1
IC404
6
7
IC401
6
7
IC401
2
1
IC
IC102,202
IC301
IC302
5
IC403
6
7
9
11
13
15
16
25,27
A
A'
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EMX62M
[+4db]
SPEAKERS
A
B
MAIN
MAIN OUT
MONITOR OUT
PHONES
EFFECT OUT
+
+
-
-
PWR 1/3
PWR 2/3
1
2
3 4
1
2
3 4
1
2
3 4
1
2
3 4
SW403
IC401
7
IC401
1
IC402
IC408,409
5
7
IC406
8
1,2,3,4,6
IC407
3
1
IC403
7
IC402
3
1
IC403
3
1
OUTPUT
REC OUT
CN501-14PIN
CN101-14PIN
W101RE1
W101RE2
W101BL1
W101BL2
38CA1-8822112
A
A’
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EMX62M
[80]
[80]
[90]
[100]
Body Assembly
Front Panel Assembly
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.
MIX62 Circuit Board 1/2
(Time required: about 16 min)
2-1.
Remove the front panel assembly. (See Procedure 1)
2-2.
Remove the cable from the cord binder marked
[170]. (Fig.2)
[170]
[170]: Cord Binder TS-0708 KSS (VZ765100)
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EMX62M
[160]
Top View
Bottom View
(Fig. 3)
[160] Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
2-3.
Remove the six (6) screws marked [160] to remove
the shield plate. (Fig.3)
2-4.
Remove the fifteen (15) screws marked [40], the
nine (9) screws marked [41], and the fourteen (14)
hexagonal nuts marked [A]. (Fig.4)
2-5.
Remove the twelve (12) knobs marked [50], eight
(8) knobs marked [60], the eight (8) knobs marked
[70], and the eight (8) knobs marked [80].
The mix62 circuit board 1/2 can then be removed.
(Fig.4)
Note: When placing the front panel assembly on
the table, take care not to weight the MIX62
circuit board 2/2. (Fig.5)
[70]
[60]
[80]
[50]
[40]
[40]
[40]
[40]
[40]
[60]
[70]
[90]
[A]
[A]
[41]
[41]
(Fig. 4)
[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. 5)
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EMX62M
[44]:
Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)
[60]:
Bind Head Screw 4.0X12 MFZN2BL (VB132700)
[90]:
Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)
[100]: Bonding Head Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
(Fig. 6-1)
3.
MIX62 Circuit Board 2/2
(Time required: about 4 min)
3-1.
Remove the front panel assembly. (See Procedure 1)
3-2.
Pinch slightly the stopper of the power switch
escutcheon with a plyer, and pull it to the front to
remove. (Fig.6-1)
3-3.
Remove the two (2) screws marked [90]. (Fig.6-2)
3-4.
Remove the power switch knob marked [110]. The
MIX62 circuit board 2/2 can then be removed.
(Fig.6-2)
Pull
Pull
Push
Push
Push
Push
MIX 2/2
[90]
[110]
[90]
[110]
(Fig. 6-2)
4.
Rear Panel Assembly
(Time required: about 5 min)
4-1.
Remove the front panel assembly. (See Procedure 1)
4-2.
Remove the six (6) screws marked [60] and the two
(2) screws marked [44]. (Fig.7)
4-3.
Hold the cord holder and pull the rear panel to the
front to remove. (Fig.8)
Note: When reinstalling, install the rear panel
assembly and the front panel assembly in that
order to connect the power supply connector
easily.
[60]
[44]
[44]
[C]
[100]
[90] [100]
Pull Up
Pull Up
Rear Panel Assembly
Rear Panel Assembly
Body Assembly
Body Assembly
(Fig. 7)
(Fig. 8)
[90]:
Bind Head Screw 3.0X8 MFZN2BL (VB659000)
[110]: Power Switch Knob MX12/4 (VU859000)
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EMX62M
[30]
[80]
[60]
[30]
[30]
[60]
[80]
[70]
5.
PWR Circuit Board 2/3
(Time required: about 7 min)
5-1.
Remove the rear panel assembly. (See Procedure 4)
5-2.
Remove the screw marked [100] and the two (2)
hexagonal nuts marked [C]. The PWR circuit board
2/3 can then be removed. (Fig.7)
6.
PWR Circuit Board 1/3
(Time required: about 9 min)
6-1.
Remove the rear panel assembly. (See Procedure 4)
6-2.
Remove the PWR circuit board 2/3. (See Procedure 5)
6-3.
Remove the six (6) screws marked [30], the six (6)
screws marked [60], the screw marked [70] and the
three (3) screws marked [80].
The PWR circuit board 1/3 can then be removed.
(Fig.9)
(Fig. 9)
[30]: Bind Head Screw SP 3.0X8 MFZN2Y (EG330290)
[60]: Bind Head Tapping Screw-B 3.0X10 MFZN2BL (EP600140)
[70]: Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
[80]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)
(Fig. 10)
7.
PWR Circuit Board 3/3
(Time required: about 6 min)
7-1.
Remove the rear panel assembly. (See Procedure 4)
7-2.
Remove the two (2) screws marked [90] and the
screw marked [100]. (Fig.7)
7-3.
Remove the screw marked [170]. The PWR circuit
board 3/3 can then be removed. (Fig.10)
[170]: Bind Head Screw A4.0X6 MFZN2BL (EG340290)
[170]
Rear Panel Assembly
PWR 3/3
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EMX62M
[40]
[40]
[40]
[40]
Body Assembly
[43]
Power Transformer
[50]: Bind Head Screw 4.0X16 MFZN2BL (EG340110)
[40]: Bind Head Tapping Screw-P 4.0X30 MFZN2BL (V8322700)
(Fig. 12)
(Fig. 13)
(Fig. 11)
8.
Power Transformer
(Time required: about 6 min)
8-1.
Remove the rear panel assembly. (See Procedure 4)
8-2.
Remove the four (4) screws marked [43]. The
power transformer can then be removed. (Fig.11)
[43]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)
9.
Front Frame (Time required: about 6 min)
9-1.
Remove the front panel assembly. (See Procedure 1)
9-2.
Remove the four (4) screws marked [50] to remove
the handle assembly. (Fig.12)
9-3.
Remove the ten (10) screws marked [40]. The front
frame can then be removed. (Fig.13)
Body Assembly
Handle
[50]
[50]
Body Assembly
Handle
[50]
[50]
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EMX62M
LSI PIN DESCRIPTION
MIX62: IC507
1
MD4
I/O
33
AVDD
-
DC A+5Vs bus
2
MD3
I/O
34
VDD
-
DC D+5V
3
MD0
I/O
External RAM interface data
35
TST0
-
DC D+5V
4
MD1
I/O
36
TST1
-
DC D+5V
5
MD2
I/O
37
DOEN
-
DC D+5V
6
MCKO
O
Master clock output
38
SDO1
O
N.C.
7
XO
O
Crystal oscillator connection
39
SDO0
O
N.C.
8
XI
I
Crystal oscillator connection
40
WC
O
N.C.
9
ER0
I
41
BCO
O
N.C
10
ER1
I
Eary refrection preset select
42
MA0
O
11
ER2
I
43
MA1
O
12
REV0
I
44
MA2
O
13
REV1
I
Effect select
45
MA3
O
14
REV2
I
46
MA4
O
15
MUTEN
I
DC D+5V
47
MA5
O
External RAM interface address
16
ICN
I
Initial clear
48
MA6
O
17
PRG
I
DC D+5V
49
MA7
O
18
MODE
I
Preset mode (H=DC +5V)
50
MA12
O
19
VSS
-
Ground
51
MA14
O
20
AVSS
-
Ground
52
VSS
-
Ground
21
CVA
-
N.C.
53
MA10
O
22
AORL
O
N.C.
54
MA011
O
23
AORR
O
N.C.
55
MA09
O
External RAM interface address
24
CHL
I
Sample hold capacitor connection
56
MA8
O
25
AIL
I
Lch ADC input
57
MA13
O
26
VDD
-
DC D+5V
58
VDD
-
DC D+5V
27
AIR
I
Rch ADC input
59
WEN
I
Write enable
28
CHR
I
Sample hold capacitor connection
60
OEN
I
Output enable
29
AOFL
O
Lch DAC output
61
CEN
I
Chip select
30
AOFR
O
Rch DAC output
62
MD7
I/O
31
AVDD
-
DC A+5V
63
MD6
I/O
External RAM interface data
32
CVB
I
Rch midpoint voltage
64
MD5
I/O
PIN
NAME
I/O
FUNCTION
NO.
PIN
NAME
I/O
FUNCTION
NO.
YSS234 (XN299A00) Digital Sound Processor
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EMX62M
IC BLOCK DIAGRAM
74HC14DT (X2166A00)
Hex Inverter
MIX62: IC504
1
2
3
4
5
6
7
13
12
11
10
9
8
14
1A
1Y
2A
2Y
3A
3Y
GND
VDD
6A
6Y
5A
5Y
4A
4Y
74HC74DT (X2167A00)
Dual D-Type Flip-Flop
MIX62: IC505
Vcc
2CLR
2Q
GND
1Q
1PR
1CRL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2PR
1Q
1CK
1D
2D
2CK
2Q
Q
PR
Q
CK
D
Q
PR
D
CK
Q
CLR
CLR
INPUTS
OUTPUTS
L
L
H
H
H
H
PR
H
L
L
H
H
H
CLR
X
X
X
L
CLK
X
X
X
H
L
X
D
H
H
L
H
L
Q
Q
L
H
H
L
H
Q
Q
NJM2060M (TE2) OP (XM560A00)
Quad Operational Amplifier
MIX62: IC408, IC409
LB1423N (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
MIX62: IC406
TL072CPSR (XV423A00)
Dual Operational Amplifier
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
+
-
+
-
NJM4558MT-1 (IG103520)
NJM2068MD-T1 (XJ553A00)
MIX62: IC101, IC102, IC201, IC202
IC301, IC302, IC303, IC401
IC402, IC403, IC404, IC407
IC501, IC502, IC503
NJM4558L-D(XQ212A00)
1
A
2
3
4
5
6
7
8
IN
V
+IN
OUT
A
A
A
+V
IN
+IN
OUT
B
B
B
+
B
+
OP AMP
PWR 1/3: IC101
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EMX62M
CIRCUIT BOARDS
CONTENTS
MIX62 1/2 CIRCUIT BOARD (COMPONENT SIDE) ...........................................................................................22
MIX62 1/2 CIRCUIT BOARD (PATTERN SIDE) ..................................................................................................24
PWR 1/3 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................26
PWR 2/3 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................28
PWR 3/3 CIRCUIT BOARD (COMPONENT SIDE) .............................................................................................28
MIX62 2/2 CIRCUIT BOARD (COMPONENT SIDE) ...........................................................................................28
MIX62 2/2 CIRCUIT BOARD (PATTERN SIDE) ..................................................................................................28
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EMX62M
G MIX62 1/2 Circuit Board
HIGH
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
LOW
MONITOR
EFFECT
LEVEL
PAD
HIGH
LOW
MONITOR
EFFECT
LEVEL
HIGH
LOW
MONITOR
EFFECT
LEVEL
HIGH
LOW
MONITOR
EFFECT
LEVEL
PAD
Hi-Z
Low-Z
Hi-Z
Low-Z
Hi-Z
Low-Z
Hi-Z
Low-Z
Super Hi-Z 1
Super Hi-Z 2
LINE 1
LINE 2
EFFEC
FOOT SW
O
SMALL HA
LARGE HA
VOCAL
A
A'
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EMX62M
EFFECT OUT
FOOT SW
AUX IN
2TR IN 1
2TR IN 2
REC OUT 1
REC OUT 2
PHONES
MAIN
MONITOR
POWER
+6
+3
0
-5
-10
YAMAHA
SPEAKER
PROCESSING
ON / OFF
ON / OFF
GRAPHIC
EQUALIZER
EFFECT RTN
EFFECT RTN
AUX IN
2TR IN
MASTER
MASTER
ON
SMALL HALL
LARGE HALL
VOCAL
PHAMTOM
A
A'
to PWR1/3-CN101
Component side
3NA-V826700 1
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EMX62M
G MIX62 1/2 Circuit Board
A
A'
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EMX62M
A
A'
Pattern side
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EMX62M
G PWR 1/3 Circuit Board
to PWR2/3-W101RE2
to PWR2/3-W101BL2
to MIX62-CN501
A
A'
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EMX62M
Component side
3NA-V826840
to Power Transformer
A
A'
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EMX62M
Pattern side
G PWR 2/3 Circuit Board
SPEAKERS
1
2
to PWR 1/3-W101BL1
to PWR 1/3-W101RE1
AC IN
to Power Tranceformer
to MIX62 2/2-CN001
ON / OFF
to PWR 3/3
1Pin-W102YE
2Pin-Non Connect
3Pin-W102BR
G PWR 3/3 Circuit Board
G MIX62 2/2 Circuit Board
Component side
PWR 2/3: 3NA-V826840 1
PWR 3/3: 3NA-V826840 1
PMIX62 2/2: 3NA-V826700 1
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EMX62M
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 and connect the load of
40Ω to PHONES OUT.
• Set each control as follows.
CH INPUT 1-4
EQ (HIGH, LOW) level control:
CENTER
MONITOR level control:
MAX
EFFECT level control:
MAX
LEVEL control:
MAX
PAD switch:
OFF
CH INPUT 5-6
EQ (HIGH, 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
EFFECT RTN level control:
MAX
MASTER (MAIN) level control:
MAX
PHANTOM switch:
OFF
YAMAHA SPEAKER PROCESSING switch: OFF
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EMX62M
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
MONITOR OUT
EFFECT OUT
REC OUT
PHONES OUT
-62
Low-Z
-32
+4±2
+4±2
+4±2
-13.8±2
+3.4±2
(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, 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
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
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
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EMX62M
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 and PHONES 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: dBs]
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
• Confirm that the ON LED lights up when DIGITAL EFFECT switch is ON, and that the LED goes out when the switch is OFF.
• Apply the music source (vocal etc), and confirm the effect aurally.
• Turn on the DIGITAL EFFECT ON switch, and confirm that sound effect can be switched on or off by using a foot switch.
2.13
Stability Check
Note: This mesurement should be performed with a load resistance connected to power amplifier output. (See 3.1)
• 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)
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3.
Power Amplifier Check
3.1
Preparation
• INPUT terminal: CH 5 LINE 1
• OUTPUT terminal: SPEAKERS 1
• Load Resistance: 4Ω (more than 200W)
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.
3.2
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.
3.3
Output Terminal D.C. Voltage Check
Ground input terminal and confirm that the D.C. voltage of output terminal is 0±100mV.
3.4
Gain Check
• Apply -26dBs signal into the input terminal and confirm that the output level of 20.0±2.0dBs can be gained.
• Confirm that the same output level can be gained at SPEAKERS 2 output.
3.5
Frequency Response Check
• YAMAHA SPEAKERS PROCESSING Switch OFF
Apply -26dBs signal into 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.
3.6
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 200W/4Ω (31.2dBs) can be gained with harmonic
distortion rate less than 0.5%.
• Apply 20Hz, 1kHz and 20kHz signal into input terminal, and confirm that output level of 100W/4Ω (28.2dBs) can be gained
with harmonic distortion rate less than 0.5%.
3.7
Remaining Noise Check
Set the MASTER (MAIN) to minimum, and confirm that the noise level of output terminal is less than -68dBs.
Note: Take care not to be affected by inductive noise.
This mesurement should be performed by using DIN AUDIO FILTER.
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3.8
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
3.9
Protection Circuit Check
• Apply 10Hz signal until output level is saturated, and confirm that the protection circuit works and the relay does not open.
• 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.
• Stop applying the input signal, and confirm that the system automatically resumes in 5 seconds.
3.10
PC LIMITER Circuit and LIMITER Circuit Check
Connect 1Ω(±5%, 100W) load and apply -20dBs signal into input terminal.
Mesure the output level and confirm that Vp-p 20V and the waveform is not a rectangule.
3.11
LIMITER Indicator Check
Apply 1kHz/-10.8dBs signal, and confirm that LIMITER indicator lights up.
3.12
Efficiency Check
Adjust the input level so that the output level of SPEAKER becomes 10V (22.2dBs).
Then confirm that the primary power is 100±20W.
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.
<__
<__
<__
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EMX62M
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