Telex manual MOTHER BOARD MCE325, 9027624501, Title, Dwg. No

5 4 3 2 1

D

+5V

CALL LIGHT MUX

				R198		C134
				270K		.1/50	7
		+14V					U30A
U21							2
		16					3
4053
					VOX IN		1
							4093
			X0		(2A)
14	X			12			14
			X1	13
15	Y		Y0	2	LSN1	(SHT1,4D)	,(SHT2,5D)
			Y1	1
					LSN2	(SHT1,4C),(SHT2,5C)
4	Z		Z0	5	LSN3	(SHT1,4B),(SHT2,6C)
			Z1	3
					LSN4	(SHT1,4B),(SHT2,5C)
			XX	11		CALL CTL1	(TO 2D)
			YY	10		CALL CTL2	(TO 2D)
				9	8
			ZZ	9	RP2G
				RP2H	22K
				22K
	6	7	8	1	1
					+14V

U23

1

CLK

D0

16

TC1

(SHT1,6D)

2

15

DI

D1

TC2

(SHT1,6D)

6

14

STR

D2

TC3

(SHT1,6A)

7

13

EN

D3

TC4

(SHT1,5A)

+5V

C139

D4

12

SPKR ON

(SHT2,6B)

5

DO

D5

11

HMS/PMS

(SHT1,8B)

D6

10

STC

(SHT2,6D)

C140

U29

40

.1/50

D7

9

SPKR DIM

(SHT2,6B)

.1/50

3

4

+5V

2

.

VCC

3

39

VPP

OSC1

VDD

Y1

R200

8

GND

28

PC0

4.00MHz

2.2M

C115

38

UCN5821A

+5V

27

PC1

OSC2

1

10pF

26

PC2

(SHT2,3C)

MONO

25

11

C116

PC3

PA0

U24

(SHT1,4D)

CALL 1

24

PC4

PA1

10

10pF

23

9

1

16

(SHT1,4C)

CALL 2

PC5

PA2

CLK

D0

LIST1

(SHT2,6D)

(SHT1,4C)

CALL 3

22

PC6

PA3

8

2

DI

D1

15

LIST2

(SHT2,7C)

(SHT1,4B)

CALL 4

21

PC7

PA4

7

6

STR

D2

14

LIST3

(SHT2,7C)

6

7

13

+5V

PA5

EN

D3

LIST4

(SHT2,6B)

5

12

PA6

D4

CALL CTL1

(7D)

4

5

11

PA7

DO

D5

CALL CTL2

(7D)

29

10

(2B)

PD0/RDI

D6

+14V

30

12

9

DSW5

PD1/TDO

PB0

D7

R199

31

13

E16

+14V

PD2/MISO

PB1

10K

32

14

3

4

+17-25VDC

PD3/MOSI

PB2

.

VCC

33

15

PD4/SCK

PB3

E10

E11

34

16

8

PD5/SS

PB4

GND

+5V

E14

E15

35

17

TCMP

PB5

36

18

UCN5821A

(AUDIBLE)

DSW7

PD7

PB6

+5V

J21

19

PB7

37

TCAP

E12

39-51-3304

E13

MOLEX FFC

+5V

2

IRQ

RESET

1

+

U25

1

VSS

C135

1

16

RP14A

1

2

680

2

CLK

D0

MIC ON

D

C

C118

.1/50

C119R208

.01/5010K

MYLAR

R209
1K	+7V

2

3

C117

10pF

R207

100K

4	C85
-	.1/50
	1
U16A
+	TL072
8	+14V

+5V

C120 R211

100pF 22K

R213

270K

								22/50					2	DI			D1	15		RP14B		3		4	680					3	SPKR ON
													6					14		RP14C		5		6		680				4
														STR			D2														PANEL MIC
							MC68HC7058						7					13		RP14D		7		8		680				5
														EN			D3														CALL LIGHT
					20													12		RP14E		9		10		680				6		FRONT
																	D4														CH 4
													5					11		RP15B		3		4		680				7		PANEL
														DO			D5														CH 3
																		10		RP15C		5		6		680				8		LEDS
																	D6														CH 2
								+5V										9		RP15D		7		8		680				9
																	D7														CH 1
																				RP15E		9		10		680				10
R212		U30B						R201					3					4													CALL RED
														.		VCC				+5V
270K		5						3.01K
		4							1%				8	GND
		6
								R215						UCN5821A
		4093				U22		100K
	C121	R214				MC33064																						+5V
					2			1
						IN	RSET
	10pF	10K
						GND					1	RP8A	1	RP8B	1	RP8C	1	RP8D	1	RP8E	1	RP8F	1	RP8G		1	RP8H	1	RP8I	J21
								C122																						39-51-3304
						3		.1/50				22K		22K		22K		22K		22K		22K		22K			22K		22K	MOLEX FFC
																												10	N.C.	11
								RP10B	4	3 100K	2		3		4		5		6		7		8			9				12	MIC ON
								RP10A	1	2 100K																				13
																															SPKR ON
			+5V					RP10C	6	5 100K																				14
																															PANEL MIC
		C138						RP10D	8	7 100K																				15	CALL LIGHT	FRONT
								RP11D	7	8 100K																				16	CH 4	PANEL
								RP11C	5	6 100K																				17		SWITCHES
		.1/50	8																												CH 3
								RP11B	3	4 100K																				18
																															CH 2
			+					RP11A	1	2 100K																				19
																															CH 1
		4	O	I	3																									20

C

B

A

U30C

8

10

9

4093

U30D

12

11

13

4093

REAR PANEL MOUNTED
F1
1	2
HOT
0.5A SBLO
2
AC PLUG
3EARTH
1
NEUTRAL

T1

TO-10R-RT 15VA

15VAC

15VAC

U28

S

1

2

93C56

C

-

+5V

RP9H

RP9F

RP9G

RP9A

RP9B

RP9C

RP9D

RP9E

5

1

1

1

1

1

1

1

1

1

22K

22K

22K

22K

22K

22K

22K

22K

RP9I

22K

RP12A

1

2 100K

9

7

8

2

3

4

5

6

10

(SHT1,8D)

REM MIC

(SHT2,1D)

RP12B

3

4 100K

CARB MIC

(SHT1,7C)

RP12C

5

6 100K

ISO

(SHT2,1D)

RP12D

7

8 100K

SPKR MUTE (SHT2,1D)

S1

1

16

K40-8S

2

15

3

14

4

13

(5D)

DSW5

5

12

ANALOG MID

6

11

(5D)

DSW7

7

10

VOLTAGE

R264

C129

8

9

+

(7D)

VOX IN

-

6

220K

100/25

7

+7V

17-25VDC SOURCE

U17B

5

R269

OFF

ON

SOURCE

+

D21

NE5532

10K

R265

+18V IN

VOX REC

220K

1N4004

D20

1N4004

(SHT2,1D)

CR1

(SHT1,1D)

(SHT1,4A)

E6

+14V

SOURCE

R268

+5V

KBL005

+14V IN

1

+4.5V

SOURCE

50VRRM

HEATSINK

D22

(TO ELECTRET PANEL

4.0A

LM317T

200

1N4004

MIC VIA NETWORK)

LM317T

E7

U26

U27

-

+ 2

OUT 2

3 IN

4

3

IN

OUT

2

+5V SOURCE

A

R263

A

R267

+

(TO DIGITAL IC'S)

+

301

+

301

C133

C125

1

1%

C128

C130

1

1%

100/25

E8

3

4700/35

10/25

.1/50

C132

+

909

+

.1/50

3.01K

R262

C127

R266

C131

1%

1%

10/25

10/25

E9

R261

C126

GND TP

22K

.1/500

2. CAPACITANCE VALUES ARE SHOWN IN MICROFARADS/VOLTS.

1. ALL RESISTORS ARE CARBON FILM,1/8W,5%.

NOTES: UNLESS OTHERWISE SPECIFIED

Title

PAGE

MOTHER BOARD MCE325

3

DWG. NO.

REV

9027624501

A

B

A

5 4 3 2 1