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MA-308

IC401

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IC401

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IC401

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IC401

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IC401

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IC401

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MA-308

IC401

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MA-308

IC401

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MA-308

IC401

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MA-308

IC401

7

MA-308

IC401

6

LOAD

MODE 1

MODE 2

MODE 3

MODE 4

REC PRF

T REEL

S REEL

END LED

T SENS

S SENS

O

I

I

I

I

I

I

I

O

I

I

∗

5

–

–

–

–

L

H/L

H/L

L

∗

3

∗

3

H

–

–

–

–

∗

1

H/L

H/L

∗

3

∗

3

∗

3

L

–

–

–

–

∗

1

H/L

H/L

∗

3

∗

3

∗

3

H

–

–

–

–

∗

1

H/L

∗

2

∗

3

∗

4

∗

4

L

–

–

–

–

∗

1

H/L

∗

2

∗

3

∗

4

∗

4

∗

5

H

H

L

H

∗

1

∗

2

∗

2

∗

3

∗

4

∗

4

∗

5

H

H

H

L

∗

1

H/L

H/L

∗

3

∗

4

∗

4

∗

5

H

L

L

L

∗

1

∗

2

∗

2

∗

3

∗

4

∗

4

∗

5

H

H

L

H

∗

1

∗

2

∗

2

∗

3

∗

4

∗

4

∗

5

H

L

L

L

∗

1

∗

2

∗

2

∗

3

∗

4

∗

4

∗

1.

“H” when erasing protection tab is bent. “L” when not bent.

∗

2.

Pulse of period in proportion to reel rotating speed.

∗

3.

Approx. 2 msec period “H” pulse.

∗

4.

Normally “L” .2 msec period “H” pulse when tape top or tape end is detected.

∗

5.

Hi-Z

MA-308

IC401

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MA-308

IC401

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MA-308

IC401

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IC401

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IC401

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I

O

O

I/O

O

RESET

V. DATA

V. CLOCK

AF. DATA

AF. CLOCK

Normally “H”, “L” when service interruption is detected or restored.

Serial communication data to video microprocessor.

Serial communication clock with video microprocessor.

Serial communication data to audio microprocessor.

Serial communication clock with audio microprocessor.

A MUTE

REC P

SP/EP

MA-308

IC401

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MA-308

IC401

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MA-308

IC401

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L

L

∗

1

L

L

∗

1

L

L

∗

1

L

L

∗

2

O

O

O

L

L

∗

1

•

L

H

∗

1

∗

1.

Selected by SP/EP selector. SP mode “L”, EP mode: “H”.

∗

2.

Selected by tape recording mode. SP mode: “L”, EP mode: “H”.

LINE SW

MA-308

IC401

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Input select control signal

O

56

TV/VTR LED

O

TV/VTR LED control signal output

57

LINE SW

O

“H” output when LINE 1

58

KR PON SW

I

KARAOKE SW signal input

59

KTV-PAUSE

-

Not used

60

SR. A LED

O

WIDE LED control signal output

61

SR. B LED

O

WAPE LED control signal output

62

EP-ON PAL

-

Not used

63

A LINE OUT MUTE

-

Not used

64

END LED

O

T/E LED control signal output

65

UNLOAD

-

Not used

66

LOAD

O

CAM motor control signal output

67

-

Not used

68

V. DATA

O

Signal for serial communication (VIDEO)

69

N.C.

-

Not used

70

V. CLK

O

Signal for serial communication (VIDEO)

71

AF. CLK

O

Signal for serial communication (Hi-Fi)

72

AF. DATA

I/O

Signal for serial communication (Hi-Fi)

73

-

Not used

74

A MUTE

O

Audio mute output

75

NTSC

-

Not used

76

CAP RVS

O

Capstan reverse control

77

CAP ERR

O

Capstan error D/A output

78

DRUM ERR

O

Drum error D/A output

79

S REEL

I

Supply reel sensor signal input

80

T REEL

I

Take up reel sensor signal input

81

ME SECAM

I

MESECAM judgment input

82

AMS

I

Normal audio detection

83

C-KILL

I

Color killer detect signal input

84

C-SYNC

I

Composite sync input

85

CAP FG

I

Capstan FG input

86

DRUM PG

I

Drum PG input

87

DRUM FG

I

Drum FG input

88

AMP VSS

-

Analog amplifier ground

89

AMP VREF OUT

O

Analog amplifier reference voltage output

90

AMP VREF IN

I

Analog amplifier reference voltage input

91

CTL IN –

I/O

CTL signal (–) input/output

92

CTL IN +

I/O

CTL signal (+) input/output

93

CTL SW OUT

O

CTL switch output

94

CTL AMP IN

I

CTL amplifier input

95

AMPC

-

CTL amplifier AC ground

96

CTL VSS

-

CTL amplifier ground

97

CTL AMP OUT

O

CTL amplifier output

98

AMP VCC

-

CTL amplifier 5 V

99

A VCC

-

Analog 5 V

100

A SWP

I

Hi-Fi switching position adjustment input

1

MONO DET

I

VARTUAL SOUND switch input

2

KEY 3

I

INPUT SELECT switch input

3

V SWP ADJ

I

Video switching position adjustment input

4

KEY 2

I

9 key input

5

KEY 1

I

9 key input

6

S SENS

I

Tape end sensor input

7

T SENS

I

Tape top sensor input

8

V ENV

I

Video envelope signal

9

AF ENV

I

Hi-Fi audio envelop signal

10

NTSC 3.58

-

Not used

11

-

Not used

12

LP-PAL

-

Not used

13

QVD

O

Quasi VD pulse output

14

REMOCON

I

Remote control signal input

15

SP/EP

O

Tape speed select

“L” output when SP mode

16

REC P

O

“H” output when REC mode

17

PAL

-

Not used

18

RF SWP

O

RF switching pulse output

19

AF SWP

O

AF switching pulse output

20

TV/VTR

O

RFU control signal output

21

PB

O

“L” output when PB mode

22-25

SUR CTRL 4-1

O

SURROUND circuit control

26-29

MODE 4-1 SW

I

Mechanism section CAM encoder (rotary switch) input

30

REC PRF

I

Erasing protection tab, cassette in detection input

31-33

DSET 1-3

I

Destination judgment

34

NUB

-

Not used (Fixed to Ground)

35

NUA

-

Not used (Fixed to Ground)

36

CLK SEL

I

Not used (Fixed to 5 V)

37

VCC

-

Power supply 5 V

38

X IN

I

Main clock input (16 MHz)

39

X OUT

O

Main clock output (16 MHz)

40

VSS

-

Ground

41

X CIN

-

Not used (Fixed to Ground)

42

X COUT

-

Not used

43

RESET

I

Reset signal input

44

DNS 3 LED

O

DANCE 3 LED control signal output

45

DNS 2 LED

O

DANCE 2 LED control signal output

46

DNS 1 LED

O

DANCE 1 LED control signal output

47

-

Not used

48

SP/EP SW

I

TAPE SPEED switch input

49

PWR R

-

Not used

50

PWR G

O

ON/STANDBY LED (GREEN) control signal output

51

C IN LED

O

C-IN (cassette-in) LED control signal output

52

REC LED

O

REC LED control signal output

53

HF LED

O

Hi-Fi LED control signal output

54

HF L LED

O

Hi-Fi L LED control signal output

55

HF R LED

O

Hi-Fi R LED control signal output

Fig.  6-2-1

Fig. 6-2-2

Mode

 Time

Video signal

Audio signal

(hifi/Normal)

1

SP

Seven minutes

Color bar

2

SP

Three minutes

Monoscope

3

EP

Seven minutes

Color bar

4

EP

Three minutes

Monoscope

400Hz

In this adjustment, NTSC pattern generator is connected with LINE
input signal terminal. Check that the amplitudes of video signal
SYNC signal, of picture portions, and of burst signals are flat at
approximately 0.3, 0.7 and 0.3 V, respectively, and that the level
ratio of the burst signal and “red” signal are 0.30: 0.66. Fig. 7-2-2.
shows video signals (color bars) used in adjusting the video section.

Video output

(75 

Ω

)

Pattern generator

VCR

VIDEO LINE IN

Monitor TV

VIDEO LINE OUT

Refer to the SERVICE  MANUAL of VHS MECHANICAL
ADJUSTMENT VI.

Necessary items and indications for total adjustment of electric
circuit of this machine will be described in this chapter.

1)

Color TV

2)

Oscilloscope 1 or 2 phenomena, band more than 30 MHz, de-
lay mode, as provided.

3)

Frequency counter (min. 8 digits)

4)

NTSC pattern generator

5)

Digital voltmeter

6)

Audio level meter

7)

Audio generator

8)

Attenuator

9)

Alignment tape
Part Code:  8-192-605-32 KRV-51N2

Unless otherwise specified, connect and adjust the measur-
ing instruments as shown in the following diagram.