Telex MCE325 Schematic Diagram, Motherboard, 9027624501, Title, Size, Orcad Generated Drawing

D

C

B

A

5	4	3	2			1
						REVISIONS
				LOC	REV	DESCRIPTION	ECO. NO	DRFT	CHKR	APP	DATE
					A	RELEASE TO FACTORY	73521	CK			12/7/00

FRONT PANEL

R1

C1 +

+4.5V

CHANNEL 1

1K

100/25

R2

R51

C18

R52

BILAT

J28

2K

+7V

+14V

CALL 1

R61

R62

C25

M-114B

47K

+7V

+

(SHT3,5D)

22K

C19

100pF

R

J1

20.0K

1

P1

16

U3

100pF

C20

60.4K

22/50

JST-B-3B-ZR

1%

2

R3

C2

4053

1%

+14V

1

J8

T

3

1

+

100pF

8

C24

4

2

2

12

X0

LISTEN BUFFER

R53

R55

NC3FDH

100

+14V

.1/50

C26

S

5

3

3

10/25

X

14 TALK CH.1/4W-A

CH.1

3

+

R63

C27

1

COM

+

13

X1

1

+

2

PANEL

(SHT2,6D)

22K

22K

U9A

CH 1

PM HI

+ 5

2

3

-

CH 2

MIC

2

Y0

7

NE5532

47/16

100

22/50

LSN1

U5B

JACK

(SHT2,1D)

Y

15 TALK

6

TALK

R64

1 1

-

4

4

100K

1

Y1

CH.2

(SHT3,7D)

TL072

+7V BUFFER

C32

RP2C

2

R58

J9

REM MIC (SHT2,1D)

RP2A

CH.1

-

.1/50

R59

22K

22K

5

Z0

R49

R50

1

NC3MDH

MIC LO

(SHT2,1D)

Z

4 TALK

U6A

LOOP

J6

+7V

3

1

MIC HI

(SHT2,1D)

2 4

3

Z1

+

60.4K

20.0K

C23

D6

D7

HP L (SHT2,2C)

CH.3/

4WIRE A

2

THRU

4W-B

PROGRAMMING

22K C21

10K

TL072

R57

1%

1%

10pF

1N4004

1N4004

3

HP R(SHT2,2C)

(SHT3,

RP1B

3

4

11

8

DIFF MIC PRE AMP (+20dB)

XX

+14V

J24

TC1

3

2D)

RP1C

2

+14V

UNBAL/BAL

(SHT3,

TC2

5

6

10

YY

100pF

2WIRE

1

MIC PROGRAMMING

C7

1nF MONO

2D)

RP1D

10K TRIMPOT VM

7

8

9

4WIRE

929647-01-03

UNBAL

1

ZZ

LIN

DYN

2

R7

R8

100K

R65

C29

R66

HEADSET

BAL

3

D15

CALL 2

CHANNEL 2

6

7

8

CONN

929647-01-03

3.01K

KEY1

R76

BILAT

R77

C36

301

(SHT3,5D)

22K

C28

100pF

47K

+

J2

+7V

JST-B-6B-ZR

FB4

FB3

C3

1%

1%

1N914

(SHT2,1D)

100pF

+

C30

60.4K

20.0K

22/50

1

KEY2

1%

1%

2

R4

100/25

D16

(SHT2,1D)

3

#73

#73

R6

100pF

4

100K

1K

6

1N914

LISTEN

+14V

R67

C4

-

R68

C34

5

7

BUFFER

8

5

+

R78

C35

1nF MONO

5

U1B

CH.2

7

+

6

R5

+

22K

22K

U9B

+

NE5532

+

3

6

-

FB2

FB1

100K

C5

R9

(IFB-A)

LSN2

1

U5A

NE5532

47/16

100

22/50

2

C22

R79

(SHT2,6C)

-

100K

+

R12

TL072

.1/50

#73

#73

100/25

301

R10

1K

(SHT3,7D)

4

6

-

R74

R75

1%

C6

R69

U6B

7

+14V

R13

3.01K

+7V

5

1nF MONO

+

TL072

60.4K

+14V

1%

20.0K

C33

D8

D9

22K

TALK

R73

1%

1%

10pF

1N4004

1N4004

R11

22K

Q1

R70

C31

BUFFER

620

2N5087

+7V

10K

CH.2

C57

+

100pF

+14V

R14

+7V

10K TRIMPOT VM

CARB MIC

(SHT3,1B)

R18

LIN

22/50

22K

100 1/4W

Q2

R80

C38

R81

CARB

R19

R16

2N5210

CALL 3

MIC

620

22K

R15

CARBON MIC SENSE

CHANNEL 3

CONN

22K

(SHT3,5D)

22K

C37

100pF

47K

R91

BILAT

R92

C44

J3

R17

100pF

+7V

+

(SHT2,6B)

SN37A-14B

100 1/4W

60.4K

20.0K

C10

C11

R21

PGMA

C39

22/50

R

1

C41

1%

+14V

1%

J4

J10

2RB

.1/50

.1/50

100pF

8

C43

3TB

C9

R20

D1

.1/50

12K

IFB A

+14V

R82

R83

NC3FDH

T

.1/50

C45

4

100K

1N4004

(TO CH 3)

3

R94

C46

1

S

.1/50

C12

(IFB-B)

LISTEN BUFFER

8

+

1

+

COM

5

1

22K

U10A

+

2

CH 3

10/25

+

ON

CH.3

3

22K

2

3

2

+14V

+

-

100

22/50

CH 4

C56

1

47/16

OFF

3

LSN3

U7A

NE5532

.1/50

2

U4

16

(SHT2,6C)

-

+7V

4

C51

4

R95

929647-01-03

TL072

4053

100K

+7V

(SHT3,7D)

2

.1/50

R89

R90

R84

4

R85

-

1

12

X0

3

U8A

+7V

+14V

C136

(SHT2,7A)

3Vpp

X

14

TALK CH.4

+

TL072

60.4K

20.0K

C42

D10

D11

+7V

R23

U2

+7V

PGMB

13

X1

22K

10K

TALK

8

R88

1%

1%

10pF

1N4004

1N4004

16

J5

C40

BUFFER

+14V

4053

R22

22K

.1/50

2

Y0

J7

CH.3

R24

IFB B

+14V

22K

(TO CH 4)

Y

15

4WIRE B

12

X0

X

100K

ON

1

1

Y1

PROGRAMMING

100pF

10K TRIMPOT VM

14

2

3

LIN

13

X1

MIC PRE/LIMITER

5

Z0

2WIRE

OFF

3

Z

2

4

1

2

Y0

929647-01-03

3

Z1

4WIRE

Y

15

+14V

+7V

1

Y1

R38

RP3C

6

11

929647-01-03

CHANNEL 4

5

XX

100

R96

C48

R97

R107

BILAT

R108

C53

NE5532

8

C8

5

Z0

RP3B 3

4

10

+7V

+

YY

CALL 4

Z

4

3

+

.1/50

C17

22K

47K

60.4K

20.0K

3

Z1

1

RP3D

7

8

9

(SHT3,5D)

100pF

C49

22/50

U1A

+

ZZ

2

C47

1%

1%

-

TC3

100K

HMS/PMS

11

XX

1/50

(SHT3,2D)

100pF

R98

R99

100pF

(SHT3,2D)

4

6

7

8

LISTEN

C54

10

YY

USM

5

+

R109

C55

+

10

(SHT2,4D)

BUFFER

U10B

7

+

RP2I

9

ZZ

RP2F

CH.4

+

5

22K

22K

6

R26

R27

R28

RP2E

-

47/16

100

22/50

22K

+14V

1

7

LSN4

7

U7B

NE5532

TALK

6

1

+14V

-

6

+7V

R110

22K

(SHT2,5C)

TL072

BUFFER

1

6

7

8

5.1M

200

22K

TC4

22K

100K

D4

KEY4

(SHT3,7D)

CH.4

6

R105

R106

-

+14V

Q3

C15

(SHT3,2D)

R100

R101

7

1N914

U8B

J305

D5

(SHT2,1D)

+7V

5

+

60.4K

R30

1N914

TL072

20.0K

C52

D12

D13

R29

1nF

22K

10K

R104

1%

1%

10pF

1N4004

1N4004

KEY3

3

+7V

5.1M

5

+14V

C50

100K

+7V

(SHT2,1D)

RP2B

R31

D2

22K

RP2D

+14V

C16

R37

(SHT2,6D)

22K

R42

100pF

10K TRIMPOT VM

5.1M

.1/50

1

100K

1N914

SIDETONE

1

LIN

NOTES: SEE SHEET 3 OF 3

10K TRIMPOT

+14V

+14V

C59

100K

R32

LIN

D14

C13

100pF

VOX REC

.1/50

+

+14V R33

R41

C14

15K

+7V

1N914

(SHT3,1A)

DR.

CHK.

APP.

Title

100/25

470K

THESE DRAWINGS AND SPECIFICATIONS ARE THE

R35

C58

R39

CK

PRPOERTY OF TELEX COMMUINCATIONS, INC.AND

R34

D3

100K

Q5

SCHEMATIC DIAGRAM

DATE

SCALE

2N5210

SHALL NOT BE REPRODUCED, COPIED, OR USED

.1/50

2K

7/15/01

22K

2N5210

FOR ANY PURPOSE WITHOUT EXPRESS WRITTEN

MOTHERBOARD

MCE325

R40

1N914

R36

30K

CONSENT.

DO NOT SCALE DRAWING

Q4

10K

TELEX

P/N

D

DWG. NO.

SIZE

9027624501

ORCAD GENERATED DRAWING

COMMUNICATIONS, INC.

Sheet 1 of 3

FILE NAME: J/IC_GROUP/ECAD/SCHEMATIC/6245

BURNSVILLE, MINNESOTA

PLANT DIST:

B.E.

5

4

3

2

1