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GenEXXA 32-8207 Service Manual

Made by: GenEXXA
Type: Service Manual
Category: Music Mixer
Pages: 11
Size: 0.68 MB

 

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STEREO SOUND MIXER

Cat. No. 32-8207

Specification 

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Block Diagam 

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Circuit Description 

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Troubleshooting 

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PCB Views 

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Electrical Parts List 

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Exploded View 

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IC Lead Identification 

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Voltage Chart. 

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Schematic Diagram 

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14

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©1 994 InterTAN  Inc.

All Rights Resewed.

Trademark of InterTAN  Inc.

 


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SPECIFICATIONS

Input Sensitivity/Impedance:

MIC ................................................... 3mV / 600 ohms
PHONO 1,2 .............................................. 3mV / 50k ohms
CD 1,2 ................................................. 150mV / 50k ohms
VIDEO .................................................. 150mV / 50k ohms
LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Level:

MASTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......

......

. . . . . . . . . .

150mV / 50k ohms

. . . . . . . . . . . . . .

RATED: 1.5V
MAX 

:

 6V

RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RATED: 0.775V

MAX 

:

 5V

PHONES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RATED:  28.28mV

S/N Ratio:

MIC ............................................................... 60 dB
PHONO ............................................................. 70 dB
CD,LINE,VIDEO ..................................................... 75 dB

Distortion:

MIC ............................................................... 0.5%
PHONO ............................................................. 0.2%
CD,LINE,VIDEO ..................................................... 0.02%

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370mm(L)x212mmWx65mm(H)

-2-

 


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CIRCUIT DESCRIPTION

THEORY OF OPERATION

AS SHOWN IN THE BLOCK DIAGRAM, THIS MIXER HAS 5 INPUTS AND 3 OUTPUTS.

THE DC 15V POWER SUPPLY ENABLES THE 18V/AC ADAPTOR TO BE CONVERTED TO ±15V
/DC AND IS USED TO FEED THE IC OF EACH STAGE AND LAMP OF THE VU METER.

THE MIC SIGNAL FROM INPUT JACK THROUGH MIC AMPLIFIER (IC2 IS A LINEAR AMP-
LIFIER) MAGNIFICATION, THEN SEND TO THE MIC LEVEL CONTROL(VRl), AFTERWARD,
THE MIC SIGNAL IS SEND TO THE MIXING BUS. AND THE PHONO l(IC3.VR2)/PHONO 2

(IC4/VR3) LIKEWISE. (IC3/IC4 IS A MATCH TO RIAA CURVES UNLINEAR AMPLIFIER)

THE SIGNAL OF CDl/VIDEO  FROM INPUT JACK IS DIRECTLY SEND TO THE LEVEL CON-
TROL(VR4),  THEN SEND TO THE MIXING BUS. AND CD2/LINE LIKEWISE.

THE SIGNAL OF MIXING BUS GOES TO THE WEIGHTED SUMMING AMPLIFIER(IC6) AND
THEN ON TO THE MASTER GAIN STAGE(IC1) MAGNIFYING IT WHICH RESULTS AS OUT-
PUT GOING TO THE REC OUTPUT JACKS AND THE MASTER OUTPUT STAGE (IC5), AND
THE MASTER OUTPUT STAGE(IC5 IS A LINEAR AMPLIFIER) SEND THE OUTPUT SIGNAL
TO THE OUTPUT JACKS.

THE SIGNAL COMING FROM THE MASTER OUTPUT STAGE(IC5) GOES THROUGH THE VU
METER AMPLIFIER(IC7),  WHICH IS THEN SHOWN ON THE VU METER.

THE SIGNAL(PRE-FADE) OF EACH CHANNELS GOES 

THROUGH THE

 

MONITOR

 SELEC

T swI-

TCH (ROTARY SWITCH SW1)WHICH IS THEN TRANSMITTED TO THE HEADPHONE AMPLIFI-
ER(IC8) & MAGNIFIED,THEN GOES TO THE HEADPHONE JACK.

 


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TROUBLESHOOTING

THIS TROUBLESHOOTING GUIDE SUGGEST AREAS TO CHECK TO FIND PROBLEMS. IN
GENERAL, EACH FAULT IS FOLLOWED BY A LIST OF POINTS TO CHECK. THESE
POINTS RANGE FROM THE MOST POSSIBBLE TO THE LEAST LIKELY.

FAULT POINTS TO CHECK

DEAD UNIT * CHECH THE AC ADAPTOR.

(VU METER NO LIGHT) * CHECK THE POWER SWITCH.

* CHECK THE POWER INPUT JACK.

VU METER WITH * CHECK THE VOLTAGE REGULATORS. (IC9,IClO)
LIGHT BUT MASTER * CHECK IC6,ICl,IC5,IC7
OUTPUT NO SIGNAL

VU METER WORKS BUT * CHECK THE WIRE CONNECTED BETWEEN R46, R47 AND
MASTER OUTPUT NO MASTER OUTPUT JACKS.
SIGNAL OUTPUT

MIC CHANNEL NOT * CHECK IC2 AND SURROUNDING PARTS
WORKING

PHONO 1 NOT WORKING * CHECK IC3 AND SURROUNDING PARTS

PHONO 2 NOT WORKING * CHECK IC4 AND SURROUNDING PARTS

HEADPHONE OUTPUT * CHECK IC8 AND SURROUNDING PARTS
NOT WORKING

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Ref.No. Description

RESISTORS

RS Part No. MFR'S PART NO.

R42 RESISTORS CARBON 1/4W±5% 1K OHM 12RCT1/4JlK
R43 RESISTORS CARBON 1/4W±5% 1K OHM 12RCT1/4JlK
R44 RESISTORS CARBON 1/4W±5% 1OOK OHM 12RCT1/4JlK
R45 RESISTORS CARBON 1/4W±5% 100K OHM 12RCT1/4JlK
R46 RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R 4 7

RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R48 RESISTORS CARBON 1/4W±5%

150K OHM 12RCT1/4J150K

R49 RESISTORS CARBON 1/4W±5%

150K OHM 12RCT1/4J150K

R50 RESISTORS CARBON 1/4W±5% 1OOK OHM 12RCT1/4JlOOK
R51 RESISTORS CARBON 1/4W±5% 1OOK OHM 12RCT1/4JlOOK
R52 RESISTORS CARBON 1/4W±5% 1OOK OHM 12RCT1/4JlOOK
R53 RESISTORS CARBON 1/4W±5% 100K OHM 12RCT1/4JlOOK
R54 RESISTORS CARBON 1/4W±5% 1OOK OHM 12RCT1/4JlOOK
R55 RESISTORS CARBON 1/4W±5% 3.3K OHM 12RCTY4J3.3K
R56 RESISTORS CARBON 1/4W±5% 3.3K OHM 12RCT1/4J3.3K
R57 RESISTORS CARBON 1/4W±5% 3.3K OHM 12RCT1/4J3.3K
R58 RESISTORS CARBON 1/4W±5% 3.3K OHM 12RCT1/4J3.3K
R59 RESISTORS CARBON 1/4W±5% 6.8K OHM 12RCT1/4J6.8K
R60 RESISTORS CARBON 1/4W±5% 6.8K OHM 12RCT1/4J6.8K
R61 RESISTORS CARBON 1/4W±5%

56K OHM 12RCT1/4J56K

R62 RESISTORS CARBON 1/4W±5%

390K OHM 12RCT1/4J390K

R63 RESISTORS CARBON 1/4W±5%

390K OHM 12RCT1/4J390K

R64 RESISTORS CARBON 1/4W±5%

56K OHM 12RCT1/4J56K

R65 RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R66 RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R67 RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R68 RESISTORS CARBON 1/4W±5%

390K OHM 12RCT1/4J390K

R69 RESISTORS CARBON 1/4W±5%

390K OHM 12RCT1/4J390K

R70 RESISTORS CARBON 1/4W±5%

100 OHM 12RCT1/4JlOO

R71

RESISTORS CARBON 1/4W±5%

150K OHM 12RCT1/4J150K

ICS

ICl

OPRATIONAL AMPLIFIER IC NJM4558DD 03ICNJM4558DD

IC2

OPRATIONAL AMPLIFIER IC NJM4558DD 03ICNJM4558DD

IC3

OPRATIONAL AMPLIFIER IC NJM4558DD 03ICNJM4558DD

IC4 OPRATIONAL AMPLIFIER IC NJM4558DD 03ICNJM4558DD
IC5 OPRATIONAL AMPLIFIER IC NJM4558DD 03ICNJM4558DD
IC6 OPRATIONAL AMPLIFIER IC NJM4558DD

03ICNJM4558DD

IC7 OPRATIONAL AMPLIFIER IC NJM4558DD

03ICNJM4558DD

IC8 OPRATIONAL AMPLIFIER IC NJM4558DD

03ICNJM4558DD

IC9

VOLTAGE REGULATOR IC NJM7815

03ICNJM7815

IClO

VOLTAGE REGULATOR IC NJM7915

03ICNJM7915

-8-

 


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Ref.No. Description

DIODES

RS Part No. MFR'S PART NO.

DIODE lN4148

lODITlN4148

DIODE lN4148

lODITlN4148

D3 DIODE lN4148

lODITlN4148

D4 DIODE lN4148

lODITlN4148

DIODE lN4001

lODITlN4001

DIODE lN4001

lODITlN4001

D7 DIODE lN4001

lODITlN4001

SLIDE POTENTIOMETERS & SWITCHS

VRl
VR2
VR3
VR4
VR5
SW1

SLIDE POTENTIOMETER 60mm

1OOK B*2

16SV60F1572BlOOK

SLIDE POTENTIOMETER 60mm

1OOK B * 2

16SV60F1572BlOOK

SLIDE POTENTIOMETER 60mm

1OOK B * 2

16SV60F1572BlOOK

SLIDE POTENTIOMETER 60mm

1OOK B * 2

16SV60F1572BlOOK

SLIDE POTENTIOMETER 60mm

1OOK B * 2

16SV60F1572BlOOK

ROTARY SWITCH 5 BAND 2 CIRCUIT

63SWR05L2S12PlB

CAPACITORS

Cl
c2
c3

C6
c7
C8
c9
Cl0
Cl1
Cl2
Cl3
Cl4
Cl5
Cl6
Cl7
Cl8
Cl9
c20
c21
c22
C23
C24
C25
C26

C27

CERAMIC

±10%

20PF/lOOV

CERAMIC

±10%

20PF/lOOV

ELECTROLYTIC ±10%

470UF/16V

ELECTROLYTIC ±10%

470UF/16V

ELECTROLYTIC ±10%

47UF/16V

CERAMIC

±10%

47PF/lOOV

ELECTROLYTIC ±10%

4.7UF/50V

ELECTROLYTIC ±10%

4.7UF/50V

ELECTROLYTIC ±10%

4.7UF/50V

ELECTROLYTIC ±10%

47UF/16V

ELECTROLYTIC ±10%

47UF/16V

MYLAR

±10%

O.O022UF/lOOV

MYLAR

±10%

O.O082UF/lOOV

MYLAR

±5%

O.O082UF/lOOV

MYLAR

±5%

O.O022UF/lOOV

ELECTROLYTIC ±20%

4.7UF/50V

ELECTROLYTIC ±20%

4.7UF/50V

MYLAR

±5%

O.lUF/lOOV

MYLAR

±5%

O.lUF/lOOV

ELECTROLYTIC ±20%

47UF/16V

ELECTROLYTIC ±20%

47UF/16V

ELECTROLYTIC ± 2 0 %

4.7UF/50V

ELECTROLYTIC ±20%

4.7UF/50V

ELECTROLYTIC ±20%

47UF/16V

ELECTROLYTIC ±20%

47UF/16V

MYLAR

O.O022UF/lOOV

MYLAR

±5%

O.O082UF/lOOV

09CClOOK20PF
09CClOOK20PF
05CE16M470UF
05CE16M470UF
05CE16M47UF
09CClOOK47PF
05CE50M4.7UF
05CE50M4.7UF
05CE50M4.7UF
05CE16M47UF
05CE16M47UF
08CMlOOJ0.0022UF
08CMlOOJ0.0082UF
08CMlOOJ0.0082UF
08CMlOOJ0.0022UF

05CE50M4.7UF
05CE50M4.7UF
08CMlOOJO.lUF
08CMlOOJO.lUF
05CE16M47UF
05CE16M47UF
05CE50M4.7UF
05CE50M4.7UF
05CE16M47UF
05CE16M47UF
08CMlOOJ0.0022UF
08CMlOOJ0.0082UF

-9-

 


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