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SERVICE MANUAL




CONTENTS
SPECIFICATIONS ................................................ 3/4
PANEL LAYOUT .................................... 5
CIRCUIT BOARD LAYOUT ................. 7
BLOCK DIAGRAM ............................ 8
DISASSEMBLY PROCEDURE .............................. 9
LSI PIN DESCRIPTION .............................. 11
IC BLOCK DIAGRAM ................................. 11
CIRCUIT BOARDS ...................................... 12
INSPECTION .............................................................. 15
MIDI INPLEMENTATION CHART .......................................... 25
PARTS LIST




PA 011457 HAMAMATSU, JAPAN
19990220-99800 1.96K-296 Printed in Japan '99.03
EMX860ST




IMPOR TANT 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 under-
stood 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 perform as specified. For
these reasons, we advise all Yamaha product owners that all service required should be performed by an
authorized Yamaha Retailer or the appointed service representative.

IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certifi-
cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of
any form.

The data provided is belived to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and
service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable
and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to
exist, please contact the distributor's Service Division.

WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body may
have accumulated by grounding yourself to the ground 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.


LITHIUM BA TTER Y HANDLING
This product uses a lithium battery for memory back-up.
WARNING : Lithium batteries are dangerous because they can be exploded by improper handling. Observe the following pre-
cautions when handling or replacing lithium batteries.
Leave lithium battery replacement to qualified service personnel.
Always replace with batteries of the same type.
When installing on the PC board by soldering, solder using the connection terminals provided on the battery cells.
Never solder directly to the cells. Perform the soldering as quickly as possible.
Never reverse the battery polarities when installing.
Do not short the batteries.
Do not attempt to recharge these batteries.
Do not disasemble the batteries.
Never heat batteries or throw them into fire.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig handtering. Udskiftning ma kun ske med batteri af samme fabrikat og type. lever det brugte
batteri tilbage til leverandren.
VARNING
Explosionsfara vid felaktigt batteribyte.
Anvand samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren.
Kassera anvant batteri enligt fabrikantens instruktion.
VAROITUS
Paristo voi rajahtaa, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiiin.
Havita kaytetty paristo valmistajan ohjeiden mukaisesti.
The following information complies with Dutch official Gazette 1995. 45; ESSENTIALS OF ORDER ON THE COLLECTION OF BATTERIES.
· Please refer to the diassembly procedure for the removal of Back-up Battery.
· Leest u voor het verwijderen van de backup batterij deze beschrijving.



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.


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




2
EMX860ST


SPECIFICATIONS

General specifications Input specifications
MAIN STEREO: 135 W+135 W/8 @0.5% THD at<° kHz, 200 W+200 W/4 @0.5% THD at 1 kHz Input level
Maximum output power MAIN BRIDGE: 400 W/8 @0.5% THD at 1 kHz Actual load Nominal Connector
Input connectors PAD impedance impedance type
Sensitivity*1 Nominal level Max. before
MONITOR: 135 W/8 @0.5% THD at 1 kHz, 200 W/4 @0.5% THD at 1 kHz cliping
20 Hz­20 kHz +1 dB, ­3 dB @1 W output into 8 (POWER AMP OUT)
Frequency response CH INPUT (Lo-Z) OFF 3 k 50­600 Mics ­62 dB (616 µV) ­50 dB (2.45 mV) ­20 dB (77.5 mV) XLR-3-31
20 Hz­20 kHz +1 dB, ­3 dB @+4 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT)
Less than 0.5% @20 Hz­20 kHz, 100 W output into 4 (POWER AMP OUT) (CH1­6) ON 600 Lines ­32 dB (19.5 mV) ­20 dB (77.5 mV) +10 dB (2.45 V) type
Total harmonic distortion CH INPUT (Hi-Z) OFF 10 k 50­600 Mics ­52 dB (1.95 mV) ­40 dB (7.75 mV) ­10 dB (245 mV) Phone jack
Less than 0.3% @20 Hz­20 kHz, +14 dB output into 10 k (MAIN OUT, MONITOR OUT, EFFECT OUT)
­125 dB equivalent input noise, ­68 dB residual output noise (POWER AMP OUT) (CH1­6) ON 600 Lines ­22 dB (61.6 mV) ­10 dB (245 mV) +20 dB (7.75 V) (TRS)*2

­95 dB residual output noise (MAIN OUT, MONITOR OUT, EFFECT OUT) MIC INPUT (CH7, 8) 3 k 50­600 Mics ­62 dB (616 µV) ­50 dB (2.45 mV) ­20 dB (77.5 mV) XLR-3-31 type*2

Hum & noise ­80 dB (MAIN OUT) Master level control: nominal level, All channel level controls: minimum LINE INPUT (CH7, 8) (L, R) 10 k 600 Line ­22 dB (61.6 mV) ­10 dB (245 mV) +20 dB (7.75 V) Phone jack

(Average, Rs=150) ­75 dB (MONITOR OUT) Master level control: nominal level, All channel level controls: minimum TAPE IN (L, R) 10 k 600 Line ­22 dBV (79.4 mV) ­10 dBV (316 mV) +17.8 dBV (7 V) Phono jack

(with 20 Hz­20 kHz BPF) ­71 dB (MAIN OUT) Master level control: nominal level, 1 channel level control: nominal level AUX IN (L, R) 10 k 600 Line ­22 dB (61.6 mV) ­10 dB (245 mV) +20 dB (7.75 V) Phone jack*3

­84 dB (EFFECT OUT) Master level control: nominal level, All channel level controls: minimum *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.
*2. Balanced.
­64 dB (EFFECT OUT) Master level control: nominal level, 1 channel level control: nominal level *3. Unbalanced.
· 0 dB=0.775 Vrms, 0 dBV=1 Vrms.
86 dB CH IN (Lo-Z) to POWER AMP OUT (CH1­6)
66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT (CH1­6)
72 dB CH IN (Lo-Z) to EFFECT OUT (CH1­6)
Output specifications
Maximum voltage gain 48 dB CH IN (Lo-Z) to REC OUT (CH1­6)
(PAD: OFF) 56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH1­6) Output level
Actual source Nominal
26 dB AUX IN to MAIN OUT Output connectors impedance impedance Connector type
24 dB TAPE IN to MAIN OUT Nominal Max. before cliping

66 dB MIC IN to MAIN OUT (CH7­8) MAIN AMP OUT (L, R) (A, B) 0.1 4/8 Speaker 37.7 W/4 (200 W/4) Phone jack
26 dB LINE IN to MAIN OUT (CH7­8)
MAIN BTL OUT 0.1 8 Speaker 75.4 W/8 (400 W/8) Phone jack
Crosstalk at 1 kHz ­65 dB adjacent input, ­65 dB input to output
MONITOR AMP OUT (A, B) 0.1 8 Speaker 37.7 W/4 (200 W/4) Phone jack
±15 dB Maximum
HIGH 10 kHz shelving MAIN OUT (L, R) 600 10 k Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
Input channel equalization MID 2.5 kHz peaking MONITOR OUT 600 10 k Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
LOW 100 Hz shelving
EFFECT OUT 600 10 k Lines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
* Turn over/roll-off frequency of shelving: 3 dB below maximum variable level.
Meters REC OUT (1, 2) 600 10 k Lines ­10 dBV (316 mV) +10 dBV (3.16 V) Phono jack
5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT)
7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz) · All output jacks are unbalanced.
Graphic equalizer · 0 dB=0.775 Vrms, 0 dBV=1 Vrms.
±12 dB Maximum (MAIN OUT, MONITOR OUT)
Internal digital effect 3 types (Vocal, L Hall, S Hall) Specifications are subject to change without prior notice.
+48 V is supplied to electrically balanced inputs for powering condenser microphones via 6.8 k current
Phantom power
limiting/isolation resisters.
Limiter Comp. : THD 0.5% (MAIN, MONITOR)
LIMIT indicators Turns on. : THD 0.5% (MAIN, MONITOR)
Foot switch DIGITAL EFFECT MUTE : on/off
Optional accessories FC5 Foot switch
USA and Canada 120 V AC 60 Hz
Power requirement Europe 230 V AC 50 Hz
Other 240 V AC 50 Hz
Power consumption 300 W
Dimensions (WxHxD) 497x324x275 mm
Weight 17 kg



3
EMX860ST




4
EMX860ST


PANEL LAYOUT

Channel section


1 1 Equalizer controls (HIGH, MID, LOW)
2 Monitor controls (MONI)
HIGH
3 Effect control (EFFECT)
­15 +15 4 PAN control (BAL/PAN control for CH7/8)
MID 5 Level control (LEVEL)
1 6 Pad switch (PAD) (1-6 only)
­15 +15
LOW


­15 +15

MONI

2
0 10
EFFECT

3
0 10
PAN

4
L R
LEVEL

5
0 10


PAD
6
1




DIGITAL EFFECT section

7 Effect select switch
8 DIGITAL EFFECT ON switch
VOCAL


L HALL 7

S HALL




ON 8

DIGITAL
EFFECT




EFFECT section

9 EFFECT OUT control
9
0 10
EFFECT OUT


EFFECT




5
EMX860ST




MONITOR section


10
10 Graphic equalizer
11 EFFECT RTN control
­12 ­12 +6
· · 12 MASTER control
6 6 +3
· ·
0 0 0 13 13 Peak level indicator
· ·
6 6 ­5
· ·
+12 +12 ­10
125 250 500 1k 2k 4k 8k




11 12
0 10 0 10
EFFECT RTN MASTER

MONITOR




MAIN section
14
14 Graphic equalizer
15 EFFECT RTN control
­12 ­12 +6
·
6
·
6 +3
16 AUX IN control
· ·
0
·
0
·
0 19 17 TAPE IN
6 6 ­5
·
+12
·
+12
18 MASTER control
­10
125 250 500 1k 2k 4k 8k L R
19 Peak level indicator




18
0 10 0 10 0 10 0 10
EFFECT RTN AUX IN TAPE IN MASTER
MAIN STEREO

15 16 17




POWER AMP section POWER indicator & PHANTOM switch
LIMITER
20 LIMITER indicator
MONI 21 Stereo/Bridge select switch 22 POWER


PHANTOM
+48V
MAIN 20 ON
OFF
L R

23
LIMITER

22 POWER indicator
L+R
BRIDGE 23 PHANTOM +48 V switch

21
STEREO

POWER
AMP



6
EMX860ST


CIRCUIT BOARD LAYOUT

Input/output panel


L LINE R L LINE R EFFECT
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z (MONO) (MONO) OUT

POWERED MIXER SUB
L L
Lo-Z Lo-Z Lo-Z Lo-Z Lo-Z Lo-Z MIC MIC AUX IN MAIN(STEREO) MONITOR MIX
FOOT SW L (MONO) R L R
R R



INPUT TO MAIN TAPE REC OUTPUT
IN OUT

Power
1 2 3 4 5 6 transformer

MIX



1 Channel input jacks (Hi-Z, Lo-Z) 1-6
2 Channel input jacks (MIC/LINE) 7-8
3 Effect output jack (EFFECT OUT)
4 Foot switch jack (FOOT SW)
5 AUX IN/TAPE IN jacks
6 REC OUT/MONITOR/MAIN (STEREO) jacks




Rear panel

SPEAKERS POWER 1/3
L+R
MONITOR R BRIDGE L
POWER 2/3


POWER 3/3

B A B A B A



1 2

POWER

3
DIMENSIONS
ON/ OFF
W:497 D:275

16

1 SPEAKERS MONITOR jacks
2 SPEAKERS L/R/L+R BRIDGE jacks
3 Power switch




308

H:324
16
Unit: mm


7
EMX860ST


BLOCK & LEVEL DIAGRAM




KEC-92359

8
EMX860ST


DISASSEMBLY PROCEDURE


1. MIX Circuit Board
1-1 Remove the six (6) screws marked [30]. The panel
assembly can then be removed. (Fig. 1)
1-2 Remove the sixty-three (63) knobs, the seventeen
(17) hexagonal nuts marked [A] and the seventeen
(17) screws marked [P120]. (Fig. 1)
1-3 Remove the fourteen (14) screws marked [P40]. The
MIX circuit board can then be removed. (Fig. 1)

2. SUB Circuit Board
2-1 Remove the panel assembly. (See Procedure 1.)
2-2 Remove the SUB circuit board from the spacer port
marked [P110]. (Fig. 2)




[P40] [P110]
[30]


[30]



[P40] [P40]




[70] [P110]
[30] [30]




[P120] [A] 17 [P120] [70]

[30]: Bonding B-Tyte Screw 4.0X8 MFZN2BL (VR779900) [70]: Bind Head Screw SP 5.0X10 MFZN2BL (VU688100)
[P40]: Hexagonal Socket Screw-P 3X25 MFZNBL (V3289800)
[P120]: Bonding Tapping Screw-P 3.0X8 MFZN2BL (VN413300) Fig.2

Fig.1




9
EMX860ST




3. PWR 1/3, 2/3, 3/3 Circuit Boards
3-1 Remove the panel assembly. (See Procedure 1.)
3-2 Remove the two (2) connectors from the power
transformer and the six (6) screws marked [50].
The rear assembly can then be removed. (Fig. 3)
3-3 Remove the six (6) screws marked [R150]. The
radiating plate with the PWR 1/3 circuit board can
then be removed. (Fig. 3)
Remove the fourteen (14) screws marked [R80], the
six (6) screws marked [R40] and the TR holder
marked [R60]. The PWR 1/3 circuit board can then
be removed. (Fig. 4)
3-4 Remove the seven (7) hexagonal nuts marked [B]
and the screw marked [R210A].
The PWR 2/3 circuit board can then be removed.
3-5 Remove two (2) screws marked [R210B]. The PWR
3/3 circuit board can then be removed. (Fig. 3)

4. Motor fan
4-1 Remove the panel assembly. (See Procedure 1-1.)
4-2 Remove the rear assembly. (See Procedure 3-2.)
4-3 Remove the PWS 1/3 circuit board. (See Procedure
3-3.)
4-4 Remove the two (2) screws marked [R100]. The
motor fan can then be removed.

5. Power transformer
5-1 Remove the panel assembly. (See Procedure 1-1.)
5-2 Remove the rear assembly. (See Procedure 3-2.)
5-3 Remove the four (4) screws marked [70]. The power
transformer can then be removed. (Fig. 2)



[R100] [50] [R100] [R150]
[R80] [R40] [R80]
[R60]




[R40]


[50] [50]
[R150] [B] [50]
7
[R210A] [R80] [R40] [R80]

[R210B]




[50]: Bonding B-Tyte Screw 4.0X8 MFZN2BL (VR779900) [R40]: Bind Head Screw SP 3.0X8 MFZN2Y (EG330290)
[R100]: Bind Head Screw 3.0X30 ZMC2BL (VT520200) [R80]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)
[R150]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)
[R210]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
Fig.4
Fig.3


10
EMX860ST


LSI PIN DISCRIPTION IC BLOCK DIAGRAM


YSS234 (XN299A00) Digital Sound Processor
NJM2068L-D (XM356A00) BA6137 (XA534A00)
PIN NAME I/O FUNCTION PIN NAME I/O FUNCTION NJM4558L (XM922A00) LED Driver
NO. NO. Dual Operational Amplifier
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 +
Constant
Current
6 MCKO O Master clock output 38 SDO1 O N.C. Circuit


7 XO O Crystal oscillator connection 39 SDO0 O N.C. 1 2 3 4 5 6 7 8 9
8 XI I Crystal oscillator connection 40 WC O N.C.
D1 D2 D3 D4 GND D5 Amp IN VCC
9 ER0 I 41 BCO O N.C Output

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 M5229P (XG203A00) TC74HC14AP (IR001400)

15 MUTEN I DC D+5V 47 MA5 O External RAM interface address
16 ICN I Initial clear 48 MA6 O 7 SEGMENTS GRAPHIC EQUALIZER Hex Inverter

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 IN1 1 - + 47k 20 -Vcc 1A 1 14 VDD
10k
21 CVA - N.C. 53 MA10 O 560
NF1 2 19 GND 1Y 2 13 6A
22 AORL O N.C. 54 MA011 O
10k
23 AORR O N.C. 55 MA09 O External RAM interface address IN2 3 - + 47k 18 +Vcc 2A 3 12 6Y
560
24 CHL I Sample hold capacitor connection 56 MA8 O
NF2 4 OUTPUT
2Y 4 11 5A
17
25 AIL I Lch ADC input 57 MA13 O
3A 5 10 5Y
26 VDD - DC D+5V 58 VDD - DC D+5V IN3 5 - + 47k 16 INVERTED
560
- + INPUT 3Y 6 9 4A
27 AIR I Rch ADC input 59 WEN I Write enable 47k
NF3 6 15 NON-INVERTED
28 CHR I Sample hold capacitor connection 60 OEN I Output enable INPUT GND 7 8 4Y

29 AOFL O Lch DAC output 61 CEN I Chip select IN4 7 - + 47k 14 NF7
560
30 AOFR O Rch DAC output 62 MD7 I/O - +
NF4 8 47k 13 IN7
31 AVDD - DC A+5V 63 MD6 I/O External RAM interface data

32 CVB I Rch midpoint voltage 64 MD5 I/O IN5 9 - + 47k 12 NF6
560
- +
NF5 10 47k 11 IN6




TC74HC74AP (IR007400)
Dual D-Type Flip-Flop

1CLR 1 14 VCC




CLR
1D 2 D 13 2CLR




CLR
1CK 3 CK D 12 2D


1PR 4 PR CK 11 2CK


1Q 5 Q PR 10 2PR


1Q 6 Q Q 9 2Q


GND 7 Q 8 2Q




INPUTS OUTPUTS
PR CLR CK D Q Q
L H H L
H L L H
L L H H
H H t H H L
H H t L H L
H H L QO QO




11
EMX860ST


CIRCUIT BOARDS

MIX Circuit Board
CN803: to SUB-CN101

LED installation

LED

LED Spacer

Circuit Board




Component side

Note : See parts list for details of circuit board component parts.




12
EMX860ST




SUB Circuit Board




CN301:
to PWR
-CN101
CN101:
to MIX
-CN803




CN202:
to MIX
-CN802




CN201:
to MIX
-CN801




Component side




3NA-V295250

13
EMX860ST



PWR 1/3 Circuit Board




CN101:
to SUB-CN301




CN102:
to Transformer




Component side




PWR 2/3 Circuit Board PWR 3/3 Circuit Board




CN105:
to AC
Cable

CN106:
to Transformer

CN104 : to PWR 1/3 -W101RE-1
-W101BL-2 Component side
-W101BE-3
-W101WH-4
-W101OR-5 Component side
-W101BR-6 KEC-72360

14
EMX860ST


INSPECTIONS


1. Measuring Instruments
Low Frequency Oscillator: Balance Output, Output Impedance = 150 ohms
Oscilloscope: Input Impedance >= 100 kohms
Level Meter: Input Impedance >= 100 kohms

Note: Use a balance input measuring instrument

2. Mixer Part

2-1 Setting Conditions
Setting conditions are as follows unless otherwise specified.

2-2 Input and Output Load
Input Signal: 1 kHz, sine wave (Rs = 150 ohms)
Load: All output terminals have a 10 k ohms load

2-3 Control Panel Setting
Channel Input (CH1-CH6) Section
EQ (HIGH, MID, LOW) level controls: Center
MONITOR level control: Maximum
EFFECT level control: Maximum
PAN: Center
LEVEL: Maximum
PAD: OFF
Stereo Channel Input (CH7-CH8) Section
EQ (HIGH, MID, LOW) level controls: Center
MONITOR level control: Maximum
EFFECT level control: Maximum
PAN: Center
LEVEL: Maximum
EFFECT Section
DIGITAL EFFECT ON switch OFF
EFFECT OUT level control Maximum
MAIN Section
GRAPHIC EQUALIZER (7 band) Fader: Center
EFFECT RTN level control: Maximum
AUX IN: Maximum
TAPE IN: Maximum
MASTER (MAIN): Maximum
MONITOR Section
GRAPHIC EQUALIZER (7 band) Fader: Center
EFFECT RTN level control: Maximum
MASTER (MAIN) level control: Maximum
Others
PHANTOM +48V switch OFF
POWER AMP switch STEREO




15
EMX860ST



2-4 Gain
Each output gain should be as shown in the table below.

Table 1: INPUT CH 1-CH 6 [Units: dBs]
Input Terminal Input Level MAIN OUT (L, R) MONITOR OUT EFFECT OUT REC OUT (L, R)
Lo-Z -62
-32 +1 +2.5
2.0 +4 ± 2 +10 +2.5
2.0 -16.8 +2.5
2.0
(PAD ON)
+2.5
Hi-Z -52 +1 2.0 - - -

Note: When the POWER AMP MODE switch is set to the BRIDGE side, confirm the gain

Table 2: INPUT CH7-CH8 [Units: dBs]
Input Terminal Input Level MAIN OUT MONITOR OUT EFFECT OUT
MIC -62 +1 +2.5
2.0 +7 ± 2 +13 +2.5
2.0
LINE L -22 +1 +2.5
2.0 +7 ± 2 +13 +2.5
2.0
LINE R -22 +1 +2.5
2.0 +1 ± 2 +7 +2.5
2.0


Table 3: AUX IN and TAPE IN [Units: dBs]
Input Terminal Input Level MAIN OUTPUT
AUX IN -22 +4 ± 2
TAPE IN -22 +1.8 ± 2

2-5 Frequency Response
When the input signal frequency is set to 20 Hz and 20 kHz for the systems shown in Tables 1, 2 and 3, the each
output terminal should fall within the range of +1 and -3 dB at 20 Hz and 20 kHz, using 1 kHz as the reference.

2-6 Equalizer Characteristics
When the input signals shown below are applied to the channel input in the states of 2-3 and the channel EQ (HIGH,MID,
LOW) level controls are changed from center position (flat), the boost/cut range at the MAIN OUT should be as follows:


Table 4 [Units: dB]
EQ Controls GAIN Frequency Response
LOW Maximum 100 Hz +12 ± 2
Minimum +12 ± 2
MID Maximum 2.5 kHz +12 ± 2
Minimum +12 ± 2
HIGH Maximum 10 kHz +12 ± 2
Minimum +12 ± 2
If the result of the equalizer is out of the specified range, change the input signal frequency so that the output
signal is at the set level. Its frequency should then be within the range of 80 - 120% of the standard frequency.

2-7 Graphic Equalizer Characteristics
When the input signals shown below are applied to the channel input in the states of 2-3 and graphic equalizer level controls are
changed from center position (flat), the boost/cut range at the MAIN OUT and the MONITOR OUT should be as follows:


Table 5 [Units: dB]
Input signal frequency and Fader name
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
Response Maximum +12 ± 2
Minimum -12 ± 2
If the result of the graphic equalizer is out of the specified range, change the input signal frequency so that the
output signal is at the set level. Its frequency should then be within the range of 80 - 120% of the standard
frequency.

16
EMX860ST



2-8 Meter LED
When the MAIN OUT and MONITOR OUT output levels are as shown in the table below, the corresponding
METER LED lights up.

Table 6 [Units: dBs]
LED Name Lighting Level
+6 +10 ± 2
+3 +7 ± 2
0 +4±2
-5 -1 ± 2
-10 -6 ± 2.5

2-9 Distortion
Set each volume control of the INPUT section and MASTER section to nominal for the systems shown in Tables 1,
2 and 3. When each output except the REC OUT level reaches +14 dBs, the distortion ratio should be less than
0.1 % from 20 Hz to 20 kHz.

2-10 Maximum Output Level
In the states of 2-9, the maximum output levels of MAIN OUT, MONITOR OUT and EFFECT OUT should be
+20 dBs with a distortion of less than 1%.

2-11 Equivalent Input Noise
The measurement CH level volume is assumed to be at maximum, and the other CH level volumes are assumed to be at
minimum in the states of 2-3.
When the Lo-z and MIC input terminals are connected with a 150 ohms resistor, the MAIN OUT terminal noise level
should be less than -61 dBs. If the noise level does not reach -61 dBs due to a gain variance, the converted noise level (=
noise level minus the actual gain of the channel) should be less than -124 dBs. (Apply a DIN-AUDIO filter.)

2-12 Residual Noise
Set all the input level controls at minimum in the states of 2-3. When the MASTER and EFFECT OUT level
controls in the MAIN and MONITOR section are changed to maximum or minimum, the residual noise should be
as shown in the table below. (Apply a DIN-AUDIO filter.)

Table 7 [Unit: dBs]
MASTER VOLUME MAIN OUTPUT MONITOR OUT EFFECT OUT
Maximum -73 -68 -77
Minimum -94 -94 -94

2-13 Phantom Power (+48 V)
Connect a load resistance of 10 K ohm (more than 1W) between pins 1 and 2 of both the Lo-z IN and the MIC IN
input terminals, then short between pins 2 and 3 of the Lo-z IN and the MIC IN input terminal.
When the PHANTOM switch is turned on, +35 ± 3 V should be obtained between the load resistance.

2-14 Digital Effect
When the DIGITAL EFFECT ON switch is turned on, the ON LED lights up. When the DIGITAL EFFECT ON
switch is turn off, the ON LED light goes out.
When the DIGITAL EFFECT ON switch is turned on while inputting a sine wave of -60 dB to the CH1 Lo-z IN
at a minimum MONITOR level control setting, the signal level of the MONITOR OUT will be more than -25 dBs.
Even if the SELECT switch is changed to VOCAL, L HALL and S HALL, confirm that the output level is even.
Confirm that the output soundfrom the vocals musics souce has a digital effect, and confirm that the effect is able
to be turned on and off by the FOOT SW.

2-15 Stability
When a capacitor of 10 FP to 0.1 F is connected in parallel to the loading resistor at each SPEAKER OUT
terminal, or when all VR and EQ control volumes are set to MAX , there should be no abnormality; for example,
there should be no oscillation. Especially, do not oscillate if the FREQ LEVEL is at maximum.


17
EMX860ST



3. Power Amplifier Part

3-1 Setting Conditions
Setting conditions are as follows unless otherwise specified.

Input Terminal: INPUT CH 8 LINE L
POWER AMP switch: STEREO
Measuring Output Terminal: (SPEAKERS) L-A, R-A, MONITOR-A
Output Load: 4 ohm (more than 200 W)
Connect the resistor when inspecting the power amplifier section
INPUT CH 1- CH 7
MONITOR level control: Minimum
EFFECT level control: Minimum
LEVEL level control: Minimum
Note: Other control settings are the same as the mixer part in section 2-3.

3-2 Power ON Muting
The muting relay should be released 2.5 +/- 1 seconds after the power switch is turned on.

3-3 Speaker Terminal DC Voltage
When input terminals are grounded, confirm that each output terminal voltage is 0 +/- 100 mV.

3-4 Gain
When applyin