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4-26E

MJ-91
(MIC JACK, AMP)
[GA70K/GA77K/GF90K/GF99K]

FR-140
(POWER,
EJECT SWITCHES)

JK-166
(LINE IN/OUT)
[GA66/GA77K/GF80/
GF90K/GF99K/PH99]

FR-142
(MODE CONTROL)

FR-141
(TAPE OPERATION)

SR-35
(SURROUND)
[GA66/GA77K/GF99K]

MA-336
VIDEO, AUDIO,
SERVO/SYSTEM CONTROL,
TUNER, POWER SUPPLY

— Ref. No. JK-166 Board; 2,000 Series —

5-1

*1

Synchronized with drum rotation. 25 Hz (PAL), 30 Hz (NTSC) 50% duty cycle.

*2

Normally “L“. “H“ when CTL signal is not generated.

*3

V period “H“ pulse.

*4

Selected by REC mode. “H“ in LP mode.“

*5

Composite sync signal (positive).

RF SWP

QVD

C SYNC

NT JUDGE

@¢
@¶
%¢
!•

O

O

I

O

*1

L

*4

L

*1

L

*5

L

*1

L

*5

L

*1

*2

*5

L

*1

*3

*5

L

*1

*3

*5

L

*1

*3

*5

L

*1

*2

*5

L

*1

*3

*5

L

*1

L

*5

L

*1

L

*5

L

*1. 25 Hz (PAL), 30 Hz (NTSC) pulse.
*2. Pulse at tape running.
*3. Reverse logic pulse of STEP PLS.
*4. “L” when drum rotation stops.
*5. Unstable period pulse.
*6. Pulse in period in proportional to tape speed.
*7. 300 Hz (PAL), 360 Hz (NTSC) pulse.
*8. Pulse at tape running.
*9. Approx. 2 msec period “H” or “L” pulse.
*10. Approx. 1.5 msec period “H” or “L” pulse.
*11. “L” when FWD SLOW, “H” when RVS SLOW.

CTL (+)

CTL (–)

DRM PG

DRM FG

CAP FG

CAP VS

DRM VS

#¡
#™
#ª
#•
$º
@∞
@§

O

I

I

I

I

O

O

Hi-Z

H

*4

*4

H/L

*8

*10

Hi-Z

*6

*1

*7

*6

*8

*10

Hi-Z

*6

*1

*7

*6

*8

*10

Hi-Z

*5

*5

*5

*8

*10

Hi-Z

*5

*5

*5

*8

*10

Hi-Z

*1

*1

*7

*6

*9

*10

Hi-Z

H/L

*1

*7

H/L

*8

*10

Hi-Z

*2

*1

*7

*2

*8

*10

Hi-Z

*6

*1

*7

*6

*9

*10

Hi-Z

*6

*1

*7

*6

*8

*10

Hi-Z

*6

*1

*7

*6

*9

*10

*1

*1

*1

*7

*6

*9

*10

Hi-Z

H

*1

*7

H/L

*8

*10

5-2

 *1. 30 Hz 50 % duty pulse approx. 5 msec delayed from RF SW P.

*1. Uncertainly.
*2. “L” when erasing protection tab is bent.  “H” when not bent.
*3. Pause of period in proportion to reel rotating speed.
*4. Approx. 2 msec period “H” pulse.
*5. Pulse at tape running.
*6. Normally “L”. 2 msec period “H” pulse when tape top or tape end is detected.

CAM2

MODE 1 (*8)

MODE 2 (*8)

MODE 3 (*8)

MODE 4 (*8)

REC PRF

T REEL FG

S REEL FG

END LED

CAP RVS

T SENS

S SENS

(∞
^™
^£
^¢
^∞
1
*•
*ª
&¢
%∞
!™
!¡

HI-Z

I

I

I

I

I

I

I

O (O.D)

O

I

I

L

H

H

L

L

H

H/L

H/L

*4

H

*4

*4

H

L

L

L

H

*2

H/L

H/L

*4

*4

*4

L

L

L

L

H

*2

H/L

H/L

*4

*4

*4

H

*1

*1

*1

*1

*2

H/L

*3

*4

L

*6

*6

L

*1

*1

*1

*1

*2

H/L

*3

*4

H

*6

*6

*7

H

H

H

L

*2

H/L

H/L

*4

H/L

*6

*6

*7

H

H

L

H

*2

*3

*3

*4

L

*6

*6

*7

H

H

L

H

*2

*3

*3

*4

H

*6

*6

*7

H

L

L

H

*2

*3

*3

*4

L

*6

*6

*7

H

L

L

L

*2

H/L

H/L

*4

L

*6

*6

*7

H

L

L

L

*2

*3

*3

*4

L/*5

*6

*6

*7

H

L

L

L

*2

*3

*3

*4

L

*6

*6

*7

H

L

L

L

*2

*3

*3

*4

L

*6

*6

*7

L

L

H

L

*2

*3

*3

*4

H

*6

*6

*7

H

L

L

L

*2

*3

*3

*4

L

*6

*6

*7

H

L

L

L

*2

H/L

H/L

*4

L

*6

*6

*7. When transition to UNLOADING direction : “L”.

When transition to LOADING direction : “H”.
When CAM MOTOR is stopped : Hi-Z.

*8. When RVS slow : Mode 1=”L”

When RVS slow : Mode 2=”L”
When RVS slow : Mode 3=”H”
When RVS slow : Mode 4=”L”

 AF ENV

 A MUTE

 AF REC P

 AF SWP

!¢
@¡
!¶
@£

 I

 O (O.D)

 O

 O

 L

 L

 *1

 L

 L

 *1

 L

 L

 *1

 *1

 L

 *1

 H

 L

 *1

 H

L

*1

 H

 L

 *1

 H

 L

 *1

 H

 L

 *1

 L

 H

 *1

 L

 L

 *1

AF RF envelope signal input terminal for automatic tracking.

5-3

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

REC PRF

AVSS

KEY1

KEY2

KEY3

KEY4

DEST2

V SWP ADJ

A SWP ADJ

DEST

S SENS

T SENS

VIDEO RF

AUDIO RF

AVCC

RESET

REC P

NTSC

KILL IN

SHARPCONT1

AU MUTE

VCC

AF SWP

RF SWP

CAP VS

DRUM VS

QVD

NC

SHARPCONT2

NC

CTL (+)

CTL (–)

VSS (SERVO)

CTLI-1

CTLI-2

CTLI-3

CTLAMP

DRUM FG

DRUM PG

CAP FG

VCC (SERVO)

VCC (OSD)

CVIN

VREF

CVOUT

CHAR. BIAS

AFC LPF

AFC OSC

VSS(OSD)

DOSC IN

I

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I (A/D)

I

O

O

I

O

O

O

O

O

O

O

O

I/O

I/O

I

I

I

I

O

I

Erasing protection tab. cassette in detection.

Analog circuit ground

Analog voltage (KEY) input 1.

Analog voltage (KEY) input 2.

Analog voltage (KEY) input 3.

Analog voltage (KEY) input 4.

Destination discrimination input 2

Video switching position adjustment

Audio switching position adjustment

Destination discrimination input 1

Supply side end sensor input

Take-up side end sensor input

Video RF envelope input

HiFi audio envelope input

Analog circuit power supply

Reset signal input

HiFi pre-amp, linear audio REC bias. REC PAUSE: L.

Video IC      NTSC: H, PAL: L

Video IC

SHARPNESS control  H: Active

Video IC  Mute on: H, Mute off: L

Power supply

AF switching pulse output

RF switching pulse output

Capstan error output

Drum error output

Quasi VD pulse output

Not connected

SHARPNESS control  H: Active

Not connected

CTL signal I/O

CTL signal I/O

Servo circuit ground

CTL amp control output

CTL amp control input

CTL amp control output

CTL amp output

Drum FG input

Drum PG input

Capstan FG input

Servo circuit power supply

OSD circuit power supply

Video signal input for character generator

Video signal output from character generator

External character brightness level input

AFC LPF pin input

AFC oscillator pin input

OSD circuit ground

DOSC IN