Telex MCE325 manual Mother Board, 9027624501, Title, Dwg. No

5

4

3

2

1

+7V

+14V

C61

16

U13

4053

J22

+14V

D

1nF

X0

745783-3

D

C60

R117

R118

SIDETONE

12

RP6B

X

USMB

4W-A LO

+

14

3

1

+14V IN

13

(SHT1,6A)

X1

13

C88

SPKR MUTE

25

(1D)

10/25

20.0K

10.0K

10K

NE5532

8

ISO

12

.1/50

1%

1%

4W-A LSN

2

Y0

RP6A

REM MIC

24

Y

R172

C89

15

2

1

+7V

3

+

11

COM

1

Y1

1

+

4 WIRE A IN

10K

U17A

+18V IN

23

2

10

-

301

COM

0dBu NOM

C63

6

5

Z0

10/25

R173

-

LSN1

RP6C

4W-B LO

22

(-10dBu TO

100pF

7

(-6dBu NOM)

Z

4

4

1

1%

100K

9

U11B

4W-B HI

+8dBu)

5

(SHT1,4D)

3

Z1

R170

4

R171

-4dBu NOM

21

+

4W-A LO

TL072

(SHT3,7D)

10K

(+6dBu pK)

4W-A HI

8

C62

R119

RP6D

(SHT1,6B)

R174

C90

STC

11

XX

KEY4

20

10K

10K

4W-A HI

+

5

1

USM

+

KEY3

7

(SHT3,2D)

10

19

YY

10K

+

C87

KEY2

(1D)

10/25

20.0K

301

10/25

R175

10/25

KEY1

6

1%

LIST1

9

ZZ

1%

100K

18

R120

C64

J21

5

MOLEX FFC

10.0K

1nF

(SHT3,2D)

HP COM

17

1%

2

3

10

39-51-3304

MIC HI

4

6

7

8

MIC LO

16

RP5A

RP5B

RP5I

30

J19

(R1)

CHS GND

3

+7V

22K

22K

22K

VOL 1

29

PGM L

PM HI

15

929647-01-04

C67

28

PM COM

2

1

1

1

27

(6A)

R177

14

TC2

1

(R3)

26

100K

1

2

C66

R124

1nF

R125

+14V

(1D)(SHT1,6D)

PGM

25

3

+

(SHT3,2D)

VOL

24

C97

4W-B LO

4

4

7

23

R176

C91

LM386

10.0K

100/25

(1D)

10/25

20.0K

22

2

R183

+

1%

1%

+14V

C137

(R2)

21

5

U18

U14

VOL 2

22

22K

.1/50

3

R181

10

TL072

4

4053

16

C93

4 WIRE B IN

C65

+7V

.1/50

C92

C94

C95

2.7

HP L

.1/50

0dBu NOM

C69

2

.1/50

(SEE SD6246)

1nF

6 1

8

10/25

R182

-

(-10dBu TO

100pF

1

4W-B LSN

12

X0

10K AUDIO POT

+

22K

(SHT1,8D)

U11A

LSN3

.1/50

+8dBu)

3

X

14

3 REQD

+

(SHT1,4B)

13

X1

+14V

C

C96

C

C68

R126

8

(-6dBu NOM)

(SHT3,7D)

2

Y0

R180

.1/50

4W-B HI

+

+14V

2N5460

Y

15

MONO SW

1K

(1D)

(SHT1,1C)

10/25

20.0K

1

Y1

R178

Q10

1%

RP7A

C86

MONO

R127

C70

5

Z0

2

+

LSN2

1

10.0K

1nF

Z

4

1M

(SHT3,5D)

10K

1%

(SHT1,4C)

3

Z1

10/25

C98

(SHT3,7D)

RP7B

.1/50

+7V

LIST3

11

XX

3

1

(SHT3,2D)

10K

10

YY

PROGRAM A

RP7C

LIST2

8

4

9

9

ZZ

4

1

C72

(SHT3,2D)

C141

+14V

10K

4

7

C105

J14

RP5G

RP5C

RP5H

U15

RP7D

R184

C99

LM386

6

7

8

16

100/25

SN37A-14B

22K

22K

22K

5

1

2

R189

C71

R130

1nF

R131

(1D)(SHT1,5A)

.1/50

4053

5

+

R

10K

U19

1

+

1

1

1

(SHT3,2D)

(SHT3,7D)

22K

.1/50

3

X0

R187

10

2RB

10.0K

TC4

1

LSN4

12

C101

3TB

10/25

20.0K

+14V

X

14

C100

C102

C103

2.7

HP R

2

(SHT1,4A)

X1

.1/50

6 1

8

T

4

1%

1%

PGMA

13

1nF

10/25

R188

3

(SHT1,8C)

S

5

R185

+

22K

4

J20

(SHT1,5B)

+14V

2

Y0

100K

.1/50

Y

+14V

C74

6

R135

929647-01-04

1

Y1

15

C104

-

R186

.1/50

100pF

7

1

1

1

5

U12B

RP5F

5

Z0

PGM R

1K

+

10K

RP5E

RP5D

Z

4

(6A)

TL072

22K

22K

C73

R132

22K

+7V

3

Z1

+14V

+

(SHT3,2D)

7

6

5

+7V

11

XX

10/25

20.0K

LIST4

R48

8

U33B

(SHT3,2D)

1%

10

10K

YY

SPKR ON

R133

C75

5

+

C107

B

10.0K

1nF

SPKR DIM

9

ZZ

C143

7

B

PROGRAM B

1%

6

-

(SHT3,2D)

4.7uF

REAR PANEL

4.7uF

R43

LM833

+7V

C81

6

7

8

20K

4

J23

SPKR JACK

J15

C82

U34

J27

SN37A-14B

MLSS100-3

MN-114B

C77

R138

1nF

R139

+

P23

1

R

R

1

+

R157

R47

6

INA

OUTA

7

1

1

2

2RB

1/50

2

1

2

2

3

INB

OUTB

T

3TB

10/25

20.0K

10.0K 1%

SPKR DIM

20K

3

3

4

T

4

1%

ADJUST

C113

5

BIAS

5

S

S

5

(MIN=6dB

LM4752/TO

4

C76

R152

MAX=26dB)

20K TRIMPOT

270pF

3

VCC

200

LIN

C79

2

.1/50

R142

4

-

100pF

1

+14V

3

U12A

+

10K

TL072

C78

R140

8

C84

8

U31A

C109

+

PGMB

R153

C142

1000uF

3

C106

+

10/25

20.0K

(SHT1,6B)

500pF

1

R44

R45

E1

1%

+14V

160K

R156

20K

4.7uF

R46

2

-

2.7

2.7

R141

C80

R154

20K

4.7uF

10.0K

1nF

J16

LM833

17-25VDC SOURCE

E2

1%

4

929647-01-03

47K

R25

+7V

ON

R155

C83

C108

C110

C111

1

10K

PGM ASSIGN

PGM L

+

6

100uF

0.1uF

0.1uF

2

-

TO HDST L

7

OFF

3

(4D)

47K

10/25

5

U16B

R54

+

TL072

20K

C112

J17

+7V

+7V

929647-01-03

ON

1

270pF

PGM ASSIGN

PGM R

2

A

TO HDST R

A

OFF

3

(4B)

NOTES: SEE SHEET 3 OF 3

J18

R56

929647-01-03

0

PGM ASSIGN

1

2

TO SPEAKER

Title

PAGE

3

MOTHER BOARD

MCE325

2

DWG. NO.

REV

9027624501

A

5

4

3

2

1