Emerson EWC1902 Schematic

Servo/System Control Block Diagram

(DECK ASSEMBLY)

AC HEAD ASSEMBLY

CL402

CONTROL
HEAD

5 5CTL(+)
6 6CTL(-)

BLOCK DIAGRAMS

MAIN CBA

Q202 Q206

SENSOR CBA
(ST-SENSOR)

Q201

END-SENS.

SENSOR CBA
(END-SENSOR)

TIMER+5V

D203
S-LED

T-REELST-SENS.

AL+5V

SW212
LD-SW

RS201

WF3

CTL

Q205

RESET

REMOTE
SENSOR

J116

AL+5V

IC201

(SERVO/SYSTEM CONTROL)

KEY 0

KEY 1

REMOTE

14

CTL AMP-OUT

97
95

CTL(+)
CTL(-)

94

LD-SW1

ST-SENS.

9
7

END-SENS.
T-REEL

80

34

RESET

P-ON-H

P-DOWN

REC LED
REC LED 22

I2C-OPEN

SP-MUTE

A-MUTE

D-REC-H

SCL

SDA

31
84

23

71

72

45

12
65
44

SW201 SW205

5

6

KEY
SWITCH

SW206 SW210

KEY
SWITCH

D204 REC

P-ON-H

P-DOWN

TO POWER
SUPPLY BLOCK

(MEMORY)

IC202

SCL

6

5

SDA

CS

7

I2C-OPEN

SP-MUTE

A-MUTE

D-REC-H

EXT-H/INSEL

SCL
SDA

SCL
SDA

AL+5V

TO CHROMA
/TUNER
BLOCK

TO AUDIO
BLOCK

CYLINDER ASSEMBLY

PG
SENSOR

DRUM
MOTOR

M

LOADING
MOTOR

M

CAPSTAN MOTOR

CAPSTAN
MOTOR

M

C-CONT

D-CONT

CN201
1C-F/R
2AL+12V
3D/L+12V
4P-ON+5V
5GND
6C-FG
7
8GND

9D-FG
10LD-CONT
11
12D-PG

AL+12V
D/L+12V
P-ON+5V

C-F/R

66

C-FG

87

C-CONT

76

D-FG

89

LD-CONT

82

D-CONT77
D-PG

90

REC-SAFETY

REC/EE/PB

C-SYNC

DV-SYNC

RF-SW

TAPE-SPEED 28

EXT-H/INSEL 29

RENTAL 30

SPL-PLAY

V-ENV

ROTA

33

27
74
13
10
15
18

32

SW211

REC
SAFETY

REC/EE/PB

C-SYNC

DV-SYNC

V-ENV

ROTA

RF-SW

TAPE-SPEED

EXT-H/INSEL

RENTAL

SPL-PLAY

TO VIDEO
BLOCK

1-8-1 1-8-2 T7300BLS

Video Block Diagram

REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC

TO CHROMA/
TUNER BLOCK

TO CHROMA/
TUNER BLOCK

JK701
REAR V-IN

FROM/TO
SERVO/SYSTEM
CONTROL BLOCK

V-OUT

VIDEO

TU-VIDEO
EXT-V-IN

EXT-H/INSEL
RENTAL
REC/EE/PB

SPL-PLAY
C-SYNC

ROTA
D-V SYNC
TAPE-SPEED

WF5

J188

IC401

VIDEO/AUDIO
SIGNAL PROCESS

WF4

TUNER

42

42

38

LINE

71
36

RENTAL
REC/EE/PB

16
73

TRICK

34

ROTA

14

D-V SYNC

39

SP/LP/EP

59

V-AGC

SYNC
SEPA

Q401

BUFFER

R

P

35

6dB

AMP

CHARA

MIX

FBC

R P

Y/C
MIX

MAIN CBA

45 47 49 44

CCD 1H

DELAY

DOC YNR Y/C COMB

CHROMINANCE

SIGNAL PROCESS

Q402

BUFFER

LUMINANCE

SIGNAL PROCESS

AGC
AMP

(DECK ASSEMBLY)

CYLINDER ASSEMBLY

VIDEO (L) HEAD

VIDEO (R) HEAD

CL401

V(L)

3

V-COM

2

V(R)

1

FROM/TO
SERVO/SYSTEM
CONTROL BLOCK

WF1

RF-SW

V-ENV

J190

RF-SW

88
89
90
91

13

93

L
R

HPF

ENV
DET

74

J189

PB-C-MONI

WF6

R

P

1-8-3 1-8-4 T7300BLV

Audio Block Diagram



FROM/TO
CHROMA/TUNER
BLOCK

FROM/TO
SERVO/SYSTEM
CONTROL BLOCK

JK702
A-IN

TU-AUDIO

SDA
SCL

WF7

BLOCK DIAGRAM FOR SECTION 2 (DECK MECHANISM)

48

26
27

53

IC301

LIMITER

SERIAL

I/F

FM DET

AF
AMP

TUNER

LINE/PB

ATT

54

51

WF8

J187

A-OUT

Q302

BUFFER

PB-AUDIO SIGNAL REC-AUDIO SIGNAL

MAIN CBA

IC801 (AMP)

7

OUTPUT

AMP

MUTE

5

IC401

(AUDIO PROCESS)

1

SP-MUTE
FROM PIN 12
OF IC201

80

Mode : SP/REC

76

TUNER

LINE

CN802
SP
SP-GND 2

JK801
EARPHONE JACK

1

SP801
SPEAKER

AC HEAD ASSEMBLY

AUDIO
HEAD

AUDIO
ERASE
HEAD

FE HEAD UNIT

FULL
ERASE
HEAD

CN287

A-PB/REC

AE-H
AE-H/FE-H

ALC

REC
AMP

LINE
AMP

D-REC-H

12

11

MUTE

71

EXT-H/INSEL TO SERVO/

D-REC-H

96

A-MUTE

SYSTEM
CONTROL
BLOCK

R

CL402
4
3A-COM
1
2

A-PB/REC

4

A-COM

3

AE-H

1

AE-H/FE-H

2

CL403

FE-H

1

FE-H GND

2

Q873

Q874

Q872
BIAS

OSC

Q871

P-ON+5V

Q875

P-ON+5V

4

99

EQ
AMP

SP/LP-ON

3

AUTO
BIAS

1
2

6

100

WF9

P

7 98

1-8-5

T7300BLA1-8-6

Chroma/Tuner Block Diagram

TU001

AGC

1

IF

11

SDA

5

SCL

4

FSC

8

INT.MONITOR

I2C-OPEN

SDA 4
SCL 5

CN303 is used for
adjustment at factory

REC-AUDIO SIGNAL

J191

RF AGC-OUT

SF001

SAW
FILTER

CN303(NO CONNECTION)
1
2

IC301 VIDEO/AUDIO/CHROMA/DEFLECTION/IF

59

63

64

43

26
27

18

WF2

31

SERIAL
I/F

INTELLIGENT
MONITORING

IF SIGNAL
CONTROL
CIRCUIT

REC VIDEO SIGNAL PB VIDEO SIGNAL Mode : SP/REC

MAIN CBA

TUNER

LINE

TUNER

58

41
38

CF301

4.5MHz
TRAP

CF302

4.5MHz
BPF

Q301

BUFFER

TU VIDEO TO VIDEO BLOCK

TU AUDIO

VIDEO
EXT V-IN

TO AUDIO BLOCK

FROM
VIDEO BLOCK

TO SERVO/SYSTEM
CONTROL BLOCK

SCL
SDA

I2C-OPEN

IC201

(SYSTEM CONTROL/OSD)

56

CV-IN

WF18
WF17

OSD-R
OSD-G
OSD-B

OSD-BLK

V-SYNC

H-SYNC

64
63
62
60

59
58

WF10

23
22
21
24

20
19

SYNC
SEPARATION

CHROMA
TRAP

LUMA
SIGNAL
PROCESS

V-SYNC
PROCESS
CIRCUIT

5
6

H-SYNC
PROCESS
CIRCUIT

CIRCUIT

OSD MIX/RBG MATRIX/
BLANKING

CHROMA
BPF

CHROMA
SIGNAL
PROCESS
CIRCUIT

LINE

CLOCK
CONTROL
CIRCUIT

34

16
15
14

10
11
33

X301

3.58MHz

WF11

J233
B-OUT

CL504

BLUE4
GREEN3
RED

2

AFC
H-DRIVE
ACL
V-RAMP-NF
V-DRIVE

TO
CRT/H.V. BLOCK
CL504A

FROM/TO
CRT/H.V. BLOCK

T7300BLC1-8-7 1-8-8