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EMX3000




A

OUTPUT

L R FOOTSW
L L
CNM01:
9L 11L TAPE REC to PWR1-CN102
MIC L R MONO

10R 12R R R
LINE 9L 11L L(MONO) L MONI1 MONI2 EFFECT

8
10R 12R R ST-SUB1 R ST-SUB2 L R C-R/PHONES

9/10 11/12

C-R/PHONES




PEAK POWER
+8
GAIN GAIN GAIN MONI 1 TAPE IN ST
+5
LEVEL
+3
L/MONO R
+1
HIGH HIGH HIGH MONI 2 -0
PHANTOM
-1 ON/OFF
-3
MID ST MONI 1 MONI 2 ST -5
MID MID C-R/PHONES
-7
-10
-15
LOW LOW LOW PARAMETER -30 ST2
PFL PROGRAM ON

ST SUB1
CNM04:
MONI 1 MONI 1 MONI 1 MONI 1 to DSP-CN101


MONI 2 MONI 2 MONI 2 MONI 2



EFFECT EFFECT EFFECT ST
ON


PAN BAL BAL
PFL
GRAPHIC EQUALIZER
ST SUB2

PFL PFL PFL AFL AFL AFL AFL AFL




3NA-V698310 1
Component side
A 21
EMX3000




A
MAIN Circuit Board




A
22
EMX3000




A




Pattern side
A
23
EMX3000




DSP Circuit Board




CN102:
to PWR1-CN101




CN101: to MAIN-CNM04
Component side




Pattern side


3NA-V698320 2


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PWR1 Circuit Board
to MAIN-CNM01 to DSP-CN102 to FAN
CN104:




CN103:
to PWR2 2/3
1 W301RE
CN101:




2 W301WH
3 W301BE
4 W301BL
CN102:




CN105:
to Transformer
CN106:
to PWR2 3/3
1 W302RE
2 W302BL
3 W302BE




Component side




3NA-V698330 2


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PWR2 1/3 Circuit Board
to Transformer




POWER ON/OFF

Component side
AC IN


to PWR1 to PWR1 to PWR1 to PWR1
PWR2 2/3 Circuit Board
-CN103 4 -CN103 3 -CN103 2 -CN103 1




2 1 BRIDGE 2 1
R/MONO L/MONO
SPEAKERS
Component side

PWR2 3/3 Circuit Board



to PWR1-CN106 1

to PWR1-CN106 2

to PWR1-CN106 3



Component side
3NA-V698350 1


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EMX3000


INSPECTIONS


A. INSPECTION OF MIXER SECTION
1. PREPARATIONS
· Unless otherwise specified, the signal to be applied should be 1kHz, -70dBs sine wave and the signal source impedance
should be 150 ohm. Also, the load resistance at each output terminal should be of the following values.
CH INSERT OUT, REC OUT 10k ohm
ST1,ST2,MONO,MONO1,MONO2,EFFECT 600 ohm
C-R/PHONES 40 ohm
· The signal level used in this specification is 0 dBs=0.775V
· Unless otherwise specified, set the controls as specified in 1-1 to 1-8 below.

1-1 CH INPUT (CH1~8)
GAIN trim Minimum
EQ(HIGH, MID, LOW) gain control CENTER
MNITOR(1, 2)level control Maximum
EFFECT level control Maximum
PAN control CENTER
Fader Maximum
PFL switch OFF

1-2 Stereo INPUT (9/10, 11/12)
A/B switch A
GAIN trim Minimum
EQ(HIGH, MID, LOW) gain control CENTER
MONITOR(1, 2) level control Maximum
EFFECT level control Maximum
PAN control CENTER
Fader Maximum
PFL switch OFF

1-3 ST SUB IN (1,2)
ST level control Maximum
MONITOR(1,2) level control Maximum
PFL switch OFF

1-4 TAPE IN
ST level control Maximum
PFL switch OFF

1-5 DIGITAL EFFECT
ON/OFF switch OFF
PROGRSM select switch 1
PARAMETER control Maximum
ST level control Maximum
MONITOR (1,2) level control Maximum

1-6 MASTER
ST GRAPHIC EQUALIZER control CENTER
GRAPHIC EQUALIZER ON switch OFF
ST1, MONO, MONITOR (1, 2), EFFECT fader Maximum
ST2, C-R/PHONES level control Maximum
ST1, MONO, MONITOR (1, 2), EFFECT AFL switch OFF




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1-7 POWER AMP
POWER AMP switch ST1L-ST1R
POWER AMP (L/BRIDGE, R) level control Minimum

1-8 PHANTOM
PHANTOM switch OFF

1-9 Measuring equipment
· The oscillator connected to the balanced type input terminal should be balanced output type with 150 ohm output impedance.
· The input impedance of the oscilloscope, level meter, etc. should be 100k ohms or more.
· The DIN audio filer should be used to measure the noise level.

2. GAIN
In the state as described in 1 above, check that the output level within the range specified in Tables 2-1 to 2-7 can be
obtained at each output terminal.

[Table 2-1] Input terminal CH1 to CH8 [Unit: dBs]
Input Input GAIN INSERT ST1,2 MONO MONI 1,2 EFFECT REC C-R/PHONES
level Trim OUT *2 OUT(L,R) OUT OUT OUT OUT (L,R) OUT *3
-60 MAX 0 +/- 2 +1 +/- 2 +4 +/- 2 +4 +/- 2 +10 +/- 2 -10.8 +/- 2 +8.5 +/- 2
MIC
-16 MIN -- +1 +/- 2 ST1(L) *1 -- -- -- -- --
-34 MAX -- +1 +/- 2 ST1(L) *1 -- -- -- -- --
LINE
+10 MIN -- +1 +/- 2 ST1(L) *1 -- -- -- -- --
INSERT *2 0 -- -- +1 +/- 2 ST1(L) *1 -- -- -- -- --
*1: Measure the display output only.
*2: Measure CH1 to CH4 only.
*3: Turn on the PFL switch of the channel to which the signal was input.

[Table 2-2] Input terminal CH9/10, 11/12 [Unit: dBs]
Input Input A/B GAIN ST1 MONI 1,2 EFFECT C-R/PHONES
level Switch Trim OUT ( L,R ) OUT OUT OUT *2
A-L/MONO +1 +/- 2 +7 +/- 2 +13 +/- 2 +8.5 +/- 2
-34 MAX
A-R +1 +/- 2 ST1( R ) *1 +1 +/- 2 MONI 1 *1 +7 +/- 2 +8.5 +/- 2
A
A-L/MONO +1 +/- 2 ST1( L ) *1 -- -- --
+10 MIN
A-R +1 +/- 2 ST1( R ) *1 -- -- --
B-L -34 MAX +1 +/- 2 ST1( L ) *1 -- -- --
B
B-R +10 MIN +1 +/- 2 ST1( R ) *1 -- -- --

*1: Measure the display output only.
*2: Turn on the PFL switch of the channel to which the signal was input.

[Table 2-3] Input terminal ST SUB IN [Unit: dBs]
Input Input level ST1 OUT ( L ) ST1 OUT ( R ) MONI 1,2 OUT C-R/PHONES OUT *1
L/MONO +4 +/- 2 +4 +/- 2 +7 +/- 2 +3.5 +/- 2 *2
+4
R -- +4 +/- 2 +1 +/- 2 +3.5 +/- 2 *2
*1: Turn on the PFL switch of the SUB IN to which the signal is input.
*2: The input level should be -6dBs.

[Table 2-4] Input terminal TAPE IN [Unit: dBs]
Input Input level ST1 OUT ( L ) ST1 OUT ( R ) C-R/PHONES OUT *1
L +4 +/- 2 -- +3.5 +/- 2 *2
-7.8
R -- +4 +/- 2 +3.5 +/- 2 *2
*1: Turn on the PFL switch.
*2: The input level should be -17.8dBs.


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· In the state as described in 1 above, input the signal of the following level to MIC IN of CH1 and turn on each AFL switch. Then
check that the output as described in [Table 2-5] is obtained at C-R/PHONES OUT (L, R).
[Table 2-5] AFL switch [Unit: dBs]
Input level GAIN Trim ST1 OUT ( L,R ) MONO OUT MONITOR 1,2 OUT EFFECT OUT
-40 MIN -7.0 +/- 2 -4.0 +/- 2 -4.0 +/- 2 +2.0 +/- 2

3. FREQUENCY RESPONSE
· In the state as described in 2, input a signal at the frequency of 20Hz and 20kHz and check that the output level at each output
terminal is within the range of +1.0/-3.0dB with 1kHz used as a reference frequency. At 20Hz with GAIN trim at the maximum
position only, however, the output level should be within the range of +1dB/-4.5dB. Also, check the output level at SUB IN for
C-R/PHONES.

4. EQUALIZER CHARACTERISTICS
· In the state as described in 1, move each of LOW, MID and HIGH of INPUT controls and check that the output level of the
frequency obtained at ST1 OUT (L, R)falls within the range given in [Table 4-1] with the output level obtained at the center click
position used as a reference.
· If the output level at a specified frequency does not fall within the range given in [Table 4-1], vary the frequency of the input signal
within the range of specified frequency +/- 20% and check that the output level within the range of [Table 4-1] is obtained.

[Table 4-1] EQ characteristics [Unit: dBs]
Control GAIN Input signal frequency Variation width
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

5. GRAPHIC EQUALIZER CHARACTERISTICS
· In the state as described in 1, move the fader of GEQ and check that the output level of the frequency obtained at ST1 OUT
(L, R) falls within the range given in [Table 5-1] with the output level obtained at the center click position used as a reference.
If the output level at a specified frequency does not fall within the range given in [Table 5-1], vary the frequency of the input signal
within the range of specified frequency +/- 20% and check that the output level within the range of [Table 5-1] is obtained.
[Table 5-1] GRAPHIC EQUALIZER characteristics [Unit: dBs]
Fader name 125 250 500 1K 2K 4K 8K
Input signal frequency 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
FADER MAX +12 +/- 2
FADER MIN -12 +/- 2


6. PEAK LED LIGHTING LEVEL
· In the state as described in 1, input a signal to MIC IN or L/MONO IN and check that the PEAK LED lights up at the input signal
level as in [Table 6-1].
[Table 6-1] PEAK LED lighting level [Unit: dBs]
Input channel CH1~8 (MIC IN) CH9/10, 11/12 (L/MONO)
Input signal level -43 +/- 2 -17 +/- 2

7. METER LIGHTING LEVEL
Check that when the output level of ST1 OUT (L, R) is as in[Table 7-1], each corresponding METER LED lights up.
[Table 7-1] METER lighting level [Unit: dBs]
LED name PEAK +8 +5 +3 +1 0 -1
Lighting start level +17 +/- 2 +12 +/- 2 +9 +/- 2 +7 +/- 2 +5 +/- 2 +4 +/- 2 +3 +/- 2
LED name -3 -5 -7 -10 -15 -20 --
Lighting start level +1 +/- 2 -1 +/- 2 -3 +/- 2 -6 +/- 2 -11 +/- 3 -16 +/- 5 --

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EMX3000




8. DISTORTION FACTOR
· In the state as described in 1, check that the distortion factor when +14dBs output is obtained at each output terminal is 0.1%
or less (except for REC OUT and INSERT OUT).
· In the case of C-R/PHONES OUT, set the 12 o'clock point of the level control to the Norminal position and the master fader
control to 5 on the scale. In this state, check that the distortion factor when +3dBs output is obtained is 0.2% or less.
· When taking measurements in [Table 2-1] and [Table 2-2], set the GAIN trim of the channel being measured only to the
maximum position but the GAIN trim of other channels to the minimum position.
· When taking measurements in [Table 2-3] and [Table 2-4], set the GAIN trim of the channels to the minimum position.

9. MAXIMUM OUTPUT
· In the state as described in 8 above, check that +20dBs output with 1% or less distortion factor is obtained at ST1 OUT (L, R),
ST2 OUT (L, R), MONO OUT, MONI 1 OUT, MONI 2 OUT and EFFECT OUT. Also, check that +8dBs output with 1% or less
distortion factor is obtained at C-R/PHONES (L, R) OUT.

10. EIN
· In the state as described in 1, set only the fader and GAIN trim of the input channel to be measured to the maximum position
and the fader of all the other input channels to the minimum position and short MIC IN with 150 ohm. Then check the noise
level obtained at ST1 OUT (L). It should be -65.5dBs or less. If it exceeds -65.5dBs, calculate the input converted noise level
and check that the result is 126.5dBs or less. (Use the DIN audio filter.)

11. RESIDUAL NOISE
· In the state as described in 1., set all Fader/Level controls in the input section to the minimum position. Then set the Fader/
Level controls in the MASTER section in [Table 11-1]to the maximum or minimum position and check that the noise level is at
the level indicated in [Table 11-1] or less.
[Table 11-1] Residual noise [Unit: dBs]
Fader or Level control ST1,2 OUT (L,R) MONO OUT MONI 1,2 OUT EFFECT OUT C-R/PHONES OUT
Maximum -87 -87 -87 -83 -78
Minimum -95.5 -95 -95 -95 -97


12. PHANTOM POWER SUPPLY (+48V)
· Connect a 10k ohms load resistance between pins 1 and 2 of MIC IN to short-circuit between signals 2 and 3. Then check that
+35 +/- 3 V voltage is obtained at both ends of the load resistance when the PHANTOM switch is turned on.

13. DIGITAL EFFECT
· In the state as described in 1, input -16 dBs/1kHz signal to MIC IN of channel 1, set MONI 1, 2 level controls of channel 1 to
the minimum position and check that -30dBs or more signal is obtained at MONI 1, 2 OUT when the DIGITAL EFFECT switch
is turned on. Also, check that a signal in the same range is obtained when the PARAMETER control is set to the minimum
position. Change the PROGRAM select switch to 2 to 16 and perform the same check.
· Check that the EFFECT function works when the signal from the music source is input.
· Check that the DIGITAL EFFECT function can be turned on and off using the foot switch.
· In the state as described in 1, change all the channel fader settings to the minimum position. Then turn on the DSP switch and
check that the noise level at ST1 OUT (L, R) is -61dBs or less. (Use the DIN audio filter.)

14. STABILITY
· Connect 10pF to 0.1µF capacitance in parallel with the load resistance at each output terminal and check that no abnormality
such as oscillation occurs.
· Set all the VR and EQ controls to the maximum position and check that no abnormality such as oscillation occurs. Be sure to
connect a load resistance to the power amplifier for this check.




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EMX3000




B. INSPECTION OF POWER AMPLIFIER
INSPECTION AT ST1L-ST1R
1 PREPARATIONS
· Input terminal: ST SUB IN 1 L/MONO
· POWER AMP Switch : ST1L-ST1R
· POWER AMP (L/BRIDGE, R) level control:MAX
· Output terminal: SPEAKER L (1), SPEAKER R (1)
· Load resistance: 40 ohm (300W or more)
Unless otherwise specified, the load resistance of the speaker should be connected only when checking the power amplifier.
· Set all the Fader/Level controls of channels1 to 10, SUB IN 2 and TAPE IN to the minimum position.
· Other than the above, use the same setting as described under PREPARATIONS for inspection.

2 Muting function at power ON
· Check that the muting function is cancelled and the relay turns on at 2.5 +/- 1 seconds after the POWER switch is turned on.

3 Fan
· Short-circuit the 2 jumper wires within the frame (between C141 and Q139) marked FAN-C in the PWR circuit board and
check that the fan runs at a low speed.

4 DC voltage at output terminal
· Ground the input terminal and check that the DC voltage at the output terminal is 0 +/- 100mV.

5 GAIN
· Input a -9.0 dBs signal to the input terminal and check that the output level of measured gain is as specified in Table 5-1 when
the POWER AMP switch setting is changed.
[Table 5-1] Gain [Unit: dBs]
POWER AMP switch ST1L-ST1R MONI 1-MONO
SPEAKER L (1,2) +20.0 +/- 2.0 +23.0 +/- 2.0
SPEAKER R (1,2) +20.0 +/- 2.0 +23.0 +/- 2.0

6 FREQUENCY RESPONSE
· Input 20Hz, 1kHz, 20kHz/-9.0dBs sine wave signals to the input signal and check that the frequency response at 20Hz and
20kHz is within the range of +1.0/-3.0dB with 1kHz used as a reference.

7 TOTAL HARMONIC DISTORTION
· Input a 1kHz signal to the input terminal and check that the total harmonic distortion is 0.5% or less when 300W + 300W/4
ohm (33.0dBs) output is obtained.
· Also, input 20Hz, 2kHz and 20kHz signals to the input terminal and check that the total harmonic distortion is 0.5% or less
when 150W + 150W/4 ohm (30.0dBs) signal is obtained at the output terminal.

8 RESIDUAL NOISE
· Set the POWER AMP L/BRIDGE, POWER AMP R level controls to the minimum position and check that the noise level at the
output terminal is -62dBs. Use care so that the measurement is not affected by the induction noise. (Use the DIN audio filter.)

9 STABILITY
· With 10kHz · -3.2dBs rectangular signal input, connect 10pF to 0.47 µ F capacitance in p parallel with 4 ohm load resistance
or 10 µ H to 0.47H inductance and check that the following items are satisfied.
Overshoot: Vp/Vo 1.8
Ringing: Within 5 waves Vp
Vo




· Disconnect 4 ohm load resistance to make the load consisting of 10pF to 0.47 µ F capacitance only, check that ringing is
within 7 waves at Vp/Vo 2.5 and no oscillation or the like occurs.
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EMX3000




10 PROTECTION CIRCUIT
· With a signal input to POWER AMP IN (L), clip the output waveform of the 10Hz signal and check that the protection circuit
functions to prevent the relay from opening.
· Check that the protection circuit functions within 2 seconds to shut off the output when a 1Hz, Vp-p=10V(13.2dBs) signal is
input and the output is restored automatically within 5 seconds when the input signal is stopped.

11 PC LIMITER CIRCUIT, LIMITER CIRCUIT, LIMITER INDICATOR
· With 1 ohm load resistance (+/- 5%, 100W) connected to the output terminal, input a 0dBs signal to the input terminal and
observe the output terminal using an oscilloscope. Then the protection circuit should function to shut off the output and the
output is restored automatically within 5 seconds when the input signal is stopped.

12 EFFICIENCY
· Input a -5.6dBs signal and check that the primary voltage is 190 +/- 50W. 12.2V (24.0dBs) output should be obtained at
SPEAKER OUT 1 and 2 at this time.

INSPECTION OF MAIN BRIDGE
1 PREPARATIONS
· Input terminal: ST BUS IN 1 L/MONO
· POWER AMP Switch : MONO BRIDGE
· POWER AMP (L/BRIDGE, R) level control : Maximum
· Output terminal: BRIDGE
· Load resistance: 8 ohm (600W or more)
Unless otherwise specified, the load resistance of the speaker should be connected only when performing inspection.
· Set all the Fader/Level controls of channels 1 to 10, SUB IN 2 and TAPE IN to the minimum position.
· Other than the above, use the same settings as described under "Inspection 1" for inspection.

· Connection of measuring equipment
T Measuring equipment input
4

Horn plug Measuring equipment GND
4


S
2 GAIN
· Input a -12.0dBs signal to the input terminal and check that +20.0 +/- 2 dBs output is obtained.

3 FREQUENCY RESPONSE
· Input 20Hz, 1kHz, 20kHz/-12.0dBs signals to the input terminal and check that the frequency response at 20Hz and 20kHz is
within the range of +1.0/-3.0dB with 1kHz used as a reference.

C. OTHER INSPECTIONS
1 POWER VOLTAGE VARIATION
· Check that no abnormality occurs with operation even when the power voltage is varied by +/- 10%.

D. FACTORY SETTINGS
· EQ GAIN, GEQ GAIN CENTER
· All VR and fader controls other than above Minimum
· All push switches OFF
· PHANTOM switch OFF
· POWER AMP switch ST1L-ST1R
· POWER AMP LEVEL VR Maximum
· POWER switch OFF
· PROGRAM switch 1

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CIRCUIT DIAGRAMS


CONTENTS

CIRCUIT DIAGRAM 1/9 (MAIN 1/5) ....................... C1
CIRCUIT DIAGRAM 2/9 (MAIN 2/5) ....................... C2
CIRCUIT DIAGRAM 3/9 (MAIN 3/5) ....................... C3
CIRCUIT DIAGRAM 4/9 (MAIN 4/5) ....................... C4
CIRCUIT DIAGRAM 5/9 (MAIN 5/5) ....................... C5
CIRCUIT DIAGRAM 6/9 (DSP) ............................... C6
CIRCUIT DIAGRAM 7/9 (PWR1 1/2) ...................... C7
CIRCUIT DIAGRAM 8/9 (PWR1 2/2) ...................... C8
CIRCUIT DIAGRAM 9/9 (PWR1/3, 2/3, 3/3) ........... C9




NJM7805FA (XJ607A00) NJM7812FA (XJ608A00)
REGULATOR +5V REGULATOR +12V
NJM7815FA (XD853A00)
REGULATOR +15V




1
2
3
1: OUTPUT 1: INPUT
1 2: COMMON
2 2: GND
3 3: INPUT 3: OUTPUT




: Metal Film Resister
: Flame Proof Carbon Resistor
: Mylar Capacitor
: Ceramic Capacitor
: Capacitor

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




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