Yamaha EMX860ST User manual

SERVICE MANUAL
PA 011457
19990220-99800 1.96K-296 Printed in Japan ’99.03
HAMAMATSU, JAPAN
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
本资料由ＯＫＸＩＡ视听皮带资源库ｗｗｗ．ｏｋｘｉａ．ｃｎ提供

EMX860ST
2
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.
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.
LITHIUM BA TTERY 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.
2

CH INPUT (Lo-Z) OFF 3 kΩ50–600ΩMics –62 dB (616 µV) –50 dB (2.45 mV) –20 dB (77.5 mV) XLR-3-31
(CH1–6) ON 600ΩLines –32 dB (19.5 mV) –20 dB (77.5 mV) +10 dB (2.45 V) type
CH INPUT (Hi-Z) OFF 10 kΩ50–600ΩMics –52 dB (1.95 mV) –40 dB (7.75 mV) –10 dB (245 mV) Phone jack
(CH1–6) ON 600ΩLines –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) (TRS)*2
MIC INPUT (CH7, 8) 3 kΩ50–600ΩMics –62 dB (616 µV) –50 dB (2.45 mV) –20 dB (77.5 mV) XLR-3-31 type*2
LINE INPUT (CH7, 8) (L, R) 10 kΩ600ΩLine –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) Phone jack
TAPE IN (L, R) 10 kΩ600ΩLine –22 dBV (79.4 mV) –10 dBV (316 mV) +17.8 dBV (7 V) Phono jack
AUX IN (L, R) 10 kΩ600ΩLine –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) Phone jack*3
MAIN STEREO: 135 W+135 W/8Ω@0.5% THD at‹°kHz, 200 W+200 W/4Ω@0.5% THD at 1 kHz
MAIN BRIDGE: 400 W/8Ω@0.5% THD at 1 kHz
MONITOR: 135 W/8Ω@0.5% THD at 1 kHz, 200 W/4Ω@0.5% THD at 1 kHz
20 Hz–20 kHz +1 dB, –3 dB @1 W output into 8Ω(POWER AMP OUT)
20 Hz–20 kHz +1 dB, –3 dB @+4 dB output into 10 kΩ(MAIN OUT, MONITOR OUT, EFFECT OUT)
Less than 0.5% @20 Hz–20 kHz, 100 W output into 4Ω(POWER AMP OUT)
Less than 0.3% @20 Hz–20 kHz, +14 dB output into 10 kΩ(MAIN OUT, MONITOR OUT, EFFECT OUT)
–125 dB equivalent input noise, –68 dB residual output noise (POWER AMP OUT)
–95 dB residual output noise (MAIN OUT, MONITOR OUT, EFFECT OUT)
–80 dB (MAIN OUT) Master level control: nominal level, All channel level controls: minimum
–75 dB (MONITOR OUT) Master level control: nominal level, All channel level controls: minimum
–71 dB (MAIN OUT) Master level control: nominal level, 1 channel level control: nominal level
–84 dB (EFFECT OUT) Master level control: nominal level, All channel level controls: minimum
–64 dB (EFFECT OUT) Master level control: nominal level, 1 channel level control: nominal level
86 dB CH IN (Lo-Z) to POWER AMP OUT (CH1–6)
66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT (CH1–6)
72 dB CH IN (Lo-Z) to EFFECT OUT (CH1–6)
48 dB CH IN (Lo-Z) to REC OUT (CH1–6)
56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH1–6)
26 dB AUX IN to MAIN OUT
24 dB TAPE IN to MAIN OUT
66 dB MIC IN to MAIN OUT (CH7–8)
26 dB LINE IN to MAIN OUT (CH7–8)
–65 dB adjacent input, –65 dB input to output
±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.
5 POINTS LED METER (MAIN OUT L/R, MONITOR OUT)
7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz)
±12 dB Maximum (MAIN OUT, MONITOR OUT)
3 types (Vocal, L Hall, S Hall)
+48 V is supplied to electrically balanced inputs for powering condenser microphones via 6.8 kΩcurrent
limiting/isolation resisters.
Comp. : THD 0.5% (MAIN, MONITOR)
Turns on. : THD 0.5% (MAIN, MONITOR)
DIGITAL EFFECT MUTE : on/off
FC5 Foot switch
USA and Canada 120 V AC 60 Hz
Europe 230 V AC 50 Hz
Other 240 V AC 50 Hz
300 W
497x324x275 mm
17 kg
Maximum output power
Frequency response
Total harmonic distortion
Hum & noise
(Average, Rs=150Ω)
(with 20 Hz–20 kHz BPF)
Maximum voltage gain
(PAD: OFF)
Crosstalk at 1 kHz
Input channel equalization
Meters
Graphic equalizer
Internal digital effect
Phantom power
Limiter
LIMIT indicators
Foot switch
Optional accessories
Power requirement
Power consumption
Dimensions (WxHxD)
Weight
3
EMX860ST
SPECIFICATIONS
General specifications
Input connectors
Input specifications
Actual load
impedance
Input level
Sensitivity*1Nominal level Max. before
cliping
Connector
type
PAD Nominal
impedance
MAIN AMP OUT (L, R) (A, B) 0.1Ω4/8ΩSpeaker 37.7 W/4Ω(200 W/4Ω) Phone jack
MAIN BTL OUT 0.1Ω8ΩSpeaker 75.4 W/8Ω(400 W/8Ω) Phone jack
MONITOR AMP OUT (A, B) 0.1Ω8ΩSpeaker 37.7 W/4Ω(200 W/4Ω) Phone jack
MAIN OUT (L, R) 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
MONITOR OUT 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
EFFECT OUT 600Ω10 kΩLines +4 dB (1.23 V) +20 dB (7.75 V) Phone jack
REC OUT (1, 2) 600Ω10 kΩLines –10 dBV (316 mV) +10 dBV (3.16 V) Phono jack
Output connectors
Output specifications
Actual source
impedance
Output level
Nominal Max. before cliping Connector type
Nominal
impedance
• All output jacks are unbalanced.
• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.
Specifications are subject to change without prior notice.
*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.
*3. Unbalanced.
• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.

4
EMX860ST

EMX860ST
5
1
2
3
4
5
6
Equalizer controls (HIGH, MID, LOW)
Monitor controls (MONI)
Effect control (EFFECT)
PAN control (BAL/PAN control for CH7/8)
Level control (LEVEL)
Pad switch (PAD) (1-6 only)
PANEL LAYOUT
010
LR
–15 +15
–15 +15
–15 +15
010
010
1
1
LEVEL
LOW
PAD
MONI
PAN
EFFECT
MID
HIGH
1
2
3
4
5
6
ON
VOCAL
L HALL
S HALL
DIGITAL
EFFECT
7
8
EFFECT
EFFECT OUT
010
9
7
8Effect select switch
DIGITAL EFFECT ON switch
DIGITAL EFFECT section
EFFECT section
9EFFECT OUT control
Channel section

EMX860ST
6
14
15
16
17
18
19
MONITOR section
010
+6
+3
0
–5
–10
•
6
•
0
•
6
•
MASTER
EFFECT RTN
MONITOR
125 250 500 1k 2k 4k 8k
–12
+12
•
6
•
0
•
6
•
–12
+12
010
10
11 12
13
+6
+3
0
–5
–10
LR
MAIN STEREO
MASTER
EFFECT RTN AUX IN TAPE IN
125 250 500 1k 2k 4k 8k
•
6
•
0
•
6
•
–12
+12
•
6
•
0
•
6
•
–12
+12
010
010010
010
14
16
15
18
19
17
MONI
LR
LIMITER
LIMITER
L+R
BRIDGE
STEREO
MAIN
POWER
AMP
20
21
POWER
PHANTOM
+48V
ON
OFF
22
23
MAIN section
POWER AMP section POWER indicator & PHANTOM switch
Graphic equalizer
EFFECT RTN control
MASTER control
Peak level indicator
10
11
12
13
Graphic equalizer
EFFECT RTN control
AUX IN control
TAPE IN
MASTER control
Peak level indicator
LIMITER indicator
Stereo/Bridge select switch
20
21
POWER indicator
PHANTOM +48V switch
22
23

7
EMX860ST
REC
OUT
TAPE
IN OUTPUT
L
LL
RR RL
(MONO) RMAIN(STEREO) MONITORAUX IN
POWERED MIXER
FOOT SW
MICLo-Z
Hi-Z LINE EFFECT
OUT
INPUT TO MAIN
LR
(MONO)
MIC
LINELR
(MONO)
Lo-Z
Hi-Z
Lo-Z
Hi-Z
Lo-Z
Hi-Z
Lo-Z
Hi-Z
Lo-Z
Hi-Z
1 2 3456
SPEAKERS
POWER
RL
BABAB
ON/ OFF
A
MONITOR L+R
BRIDGE
1 2
3
1
2
3
4
5
6
Channel input jacks (Hi-Z, Lo-Z) 1-6
Channel input jacks (MIC/LINE) 7-8
Effect output jack (EFFECT OUT)
Foot switch jack (FOOT SW)
AUX IN/TAPE IN jacks
REC OUT/MONITOR/MAIN (STEREO) jacks
Input/output panel
1
2
3
SPEAKERS MONITOR jacks
SPEAKERS L/R/L+R BRIDGE jacks
Power switch
Rear panel
DIMENSIONS
30816
H:324
16
W:497 D:275
Unit: mm
（単位）
CIRCUIT BOARD LAYOUT
MIX
SUB
MIX
Power
transformer
POWER 1/3
POWER 2/3
POWER 3/3

8
EMX860ST
BLOCK & LEVEL DIAGRAM
KEC-92359

EMX860ST
9
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)
[P120] [A]
[30] [30]
[30]
[30]
[P40]
[P40]
[P40]
[P120]
17
[70]
[P110]
[P110]
[70]
Fig.1
Fig.2
[30]: Bonding B-Tyte Screw 4.0X8 MFZN2BL (VR779900)
[P40]: Hexagonal Socket Screw-P 3X25 MFZNBL (V3289800)
[P120]: Bonding Tapping Screw-P 3.0X8 MFZN2BL (VN413300)
[70]: Bind Head Screw SP 5.0X10 MFZN2BL (VU688100)

EMX860ST
10
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)
[R80] [R40]
[R40] [R80]
[R80]
[R40]
[R60]
[R80]
[50]
[R210B]
[R210A]
[50]
[50]
[R150] [50]
[R150]
[R100]
[R100]
7
[B]
Fig.3
Fig.4
[50]: Bonding B-Tyte Screw 4.0X8 MFZN2BL (VR779900)
[R100]: Bind Head Screw 3.0X30 ZMC2BL (VT520200)
[R150]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)
[R210]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[R40]: Bind Head Screw SP 3.0X8 MFZN2Y (EG330290)
[R80]: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)

IC BLOCK DIAGRAM
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
11
EMX860ST
LSI PIN DISCRIPTION
NJM2068L-D (XM356A00)
NJM4558L (XM922A00)
Dual Operational Amplifier
BA6137 (XA534A00)
LED Driver
M5229P (XG203A00)
7 SEGMENTS GRAPHIC EQUALIZER TC74HC14AP (IR001400)
Hex Inverter
TC74HC74AP (IR007400)
Dual D-Type Flip-Flop
D1
+++++
+
Constant
Current
Circuit
1
D2
2
D3
3
D4
4
GND
5
D5
6
Amp
Output
7
IN
8
VCC
9
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
IN1
IN2
IN3
IN4
IN5
NF1
NF2
NF3
NF4
NF5
-Vcc
GND
+Vcc
OUTPUT
INVERTED
INPUT
NON-INVERTED
INPUT
NF7
NF6
IN7
IN6
-+
-+
-+
-+
-+
-+
-+
-+
47k
560
47k
560
47k
560
47k
560
47k
47k
47k
47k
560
10k
10k 11A
2
3
4
5
6
7
1Y
2A
2Y
3A
3Y
GND 8
9
10
11
12
13
14 VDD
6A
6Y
5A
5Y
4A
4Y
PR CLR
INPUTS OUTPUTS
CK D Q Q
LH H L
HL L H
LL H H
HH tHH L
HH t L H L
HH L Q Q
D
CK
PR
Q
Q
D
CK
PR
Q
Q
CLR
CLR
OO
2PR
11CLR
2
3
4
5
6
7
1D
1CK
1PR
1Q
1Q
GND 8
9
10
11
12
13
14 VCC
2CLR
2D
2CK
2Q
2Q
PIN NAME I/O FUNCTION
NO. PIN NAME I/O FUNCTION NO.


















YSS234 (XN299A00) Digital Sound Processor


































12
EMX860ST
CIRCUIT BOARDS
MIX Circuit Board
Component side
LED installation
CN803: to SUB-CN101
LED
LED Spacer
Circuit Board
Note : See parts list for details of circuit board component parts.

CN101:
to MIX
-CN803
CN301:
to PWR
-CN101
CN202:
to MIX
-CN802
CN201:
to MIX
-CN801
SUB Circuit Board
Component side
3NA-V295250
13
EMX860ST

CN104 : to PWR 1/3 -W101RE-1
-W101BL-2
-W101BE-3
-W101WH-4
-W101OR-5
-W101BR-6
14
EMX860ST
PWR 1/3 Circuit Board
Component side KEC-72360
Component side
Component side
PWR 2/3 Circuit Board PWR 3/3 Circuit Board
CN105:
to AC
Cable
CN106:
to Transformer
CN101:
to SUB-CN301
CN102:
to Transformer

EMX860ST
15
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

EMX860ST
16
Hi-Z -52 +1 - - -
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 InputLevel MAIN OUT (L, R) MONITOR OUT EFFECT OUT REC OUT (L, R)
Lo-Z -62
-32
(PAD ON) +1 +4 +10 -16.8
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 +7 ±2+13
LINE L -22 +1 +7 ±2+13
LINE R -22 +1 +1 ±2+7
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.
+2.5
2.0
+2.5
2.0
+2.5
2.0
+2.5
2.0
+2.5
2.0
+2.5
2.0
+2.5
2.0
+2.5
2.0 +2.5 2.0 +2.5 2.0
±2

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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.

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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 applying a 1 kHz -26.0 dBs sine wave to an INPUT terminal, confirm that the SPEAKERS L+R terminal
output levels are +17.0 dBs and the SPEAKERS MONITOR terminal output levels is +23.0 dB dBs.
The SPEAKERS L-B, R-B and MONITOR B output terminals should also be measured.
3-5 Frequency Response
Apply a 20 Hz, 1 kHz and 20 kHz = 26 dB sine wave signal separately to the input; the output level should be
between -3 and +1 dB at 20 Hz and 20 kHz, when 1 kHz is set as the reference. (0 dB)
3-6 Harmonic Distortion
Apply a 1 kHz sine wave signal to the input; the three output levels should be 200 W/4 ohms (31.2 dBs/ch); the
distortion ratio should be less than 0.5 %.
Apply a sine wave signal of 20 Hz, 1 kHz and 20 kHz separately to the input; the three output level should be 100 W
/4 ohms (28.2 dBs/ch); the distortion ratio should be less than 0.5 %.
Do this inspection within 30 seconds.
3-7 Residual Noise
Set the MASTER level controls (MONITOR and MAIN) at minimum; the residual noise should be less than -68 dBs.
Notes: Apply a DIN-AUDIO filter.
3-8 Stability
Apply a 10 kHz -26 dBs rectangular signal to the input and connect a capacitor (10 pF to 0.47 F) parallel to the 4
ohm load resistor, or connect an inductor (10 H to 0.47 H) serial to the 4 ohm load resistor. Confirm that the output
signal is as illustrated below.
Overshoot: Vp/Vo <= 1.8
Ringing: 5wavesandlessthan5waves Vp Vo
Next, only connect a capacitor (10 pF to 0.47µF) to the SPEAKERS terminal as a load, and confirm that the output
is as follows:
Overshoot: Vp/Vo <= 2.5
Ringing: It should end within 7 waves; there is no oscillation.
+2.5
2.0 +2.5 2.0

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3-9 Protection
Apply a 10 Hz sine wave signal to the input; increase the input signal so that the output signal is clipped. Confirm
that the protection does not operate and that the speaker relay does not be open.
When applying a 1 Hz, 6 Vp-p (8.7 dBs) sine wave signal to the input, confirm that the protection operates within 2
seconds and that the speaker relay is turned off. When turning off the input signal, confirm that the protection stops
the operation seconds and that the speaker relay automatically turns on within 5 seconds.
3-10 PC Limiter and Limiter
Apply a 1 kHz -20 dBs sine wave signal to the input and then connect a 1 ohm ( +/- 5% 100 W) resistor; confirm that the
output signal is Vp-p <= 20V and that the signal is not rectangular.
3-11 LIMITER Indicator
When applying a 1 kHz -10.8 dBs sine wave signal to the input, the LIMITER indicator should light up.
3-12 Efficiency
When adjusting for the output of L and R to become 10V (+2.2 dBs), confirm that the power consumption is 330 +/- 50W.
4. Main Bridge
4-1 Setting Conditions
Input Terminal: INPUT CH 8 LINE L
POWER AMP switch: BRIDGE
Measuring Output Terminal: SPEAKERS, L + R BRIDGE
Output Load: 8 ohm (more than 400 W)
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.
4-2 Connection
Tip Measuring instruments input
4 ohm
Phone Plug Measuring instruments ground
4 ohm
Sleeve
4-3 Gain
Apply a 1 kHz -26.0 dBs sine wave signal to the input; confirm that the output levels are +20.0 dBs dB.
4-4 Frequency Response
Apply a sine wave signal to the input; the output level should be between -3 and +1 dB at 20 Hz and 20 kHz,
when 1 kHz is set as the reference. (0 dB)
5. Power Supply Fluctuation
There should be no operational problems when the power supply fluctuation is within +/- 10% of the nominal
voltage.
+2.5
2.0

EMX860ST
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