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– 21 –

– SET UPPER VIEW –

– MAIN BOARD (CONDUCTOR SIDE) –

RV402  VCO Frequency Adjustment

RV401
L401







Sub Carrier Adjustment

TU1

RV1  AM Auto Scan/Stop Level Adjustment

RV2  FM Auto Scan/Stop Level Adjustment

RV4  FM Stereo Separation Adjustment

RV221

(R-CH)

RV121
(L-CH)















DOLBY Level

Adjustment

Tape Speed Adjustment

J1
antenna jack

TP

(VCO)

TP

(PLT)

TP (DOLBY  R)
TP (GND)
TP (DOLBY  L)

ON

↑

OFF

TU1

S701

power select

switch

IC401

– 22 –

1

DSEL

I

Destination setting terminal (fixed at center voltage)

2

RCIN0

I

Rotary remote commander shift key A/D input terminal

3

SD IN

I

Station detector detect input from the FM/AM tuner unit (TU1)
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

4

AVSS

—

Ground terminal (for A/D converter)

5

ST

I/O

6

PLL CE

O

PLL serial chip enable output to the FM/AM PLL (IC31)

7

AVREF1

I

Reference voltage (+5V) input terminal (for D/A converter)

8

PLLSI

I

PLL serial data input from the FM/AM PLL (IC31)

9

PLLSO

O

PLL serial data output to the FM/AM PLL (IC31)

10

PLLCKO

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC31)

11

POL ST

I

Polar stereo signal input from the polar multiplexer (IC401)

12

LCDSO

O

Serial data output to the liquid crystal display driver (IC901)

13

LCDCKO

O

Serial data transfer clock signal output to the liquid crystal display driver (IC901)

14

LCDCE

O

Chip enable output to the liquid crystal display driver (IC901)

15

LCDINH

O

Blank indicate control signal output to the liquid crystal display driver (IC901)
“L”: no display

16

UNISI

I

Serial data input from the bus interface (IC571) (for SONY bus)

17

UNISO

O

Serial data output to the bus interface (IC571) (for SONY bus)

18

UNICKI

I

Serial data reading clock signal input terminal

19

UNICKO

O

Serial data transfer clock signal output to the bus interface (IC571) (for SONY bus)

20

BUSON

O

Bus on/off control signal output to the bus interface (IC571) (for SONY bus)    “L”: bus on

21

SYSRST

O

Reset signal output to the bus interface (IC571) (for SONY bus)    “L”: reset

22

AMPON

O

Standby control signal output to the power amplifier (IC471)

23

AMPMUTE

O

Muting control signal output to the power amplifier (IC471)

24

TUNON

O

Tuner system power supply on/off control signal output to the BA3918 (IC601)    “H”: tuner on

25

FM ON

O

FM system power supply on/off control signal output to the BA3918 (IC601)    “H”: FM on

26

PW ON

O

Main system power supply on/off control signal output to the BA3918 (IC601)    “H”: power on

27

COLOR

I

Input terminal to set whether the illumination color change function is present or not
“L”: illumination color change function is present (fixed at “L”)

28

AMS ON

O

Tape auto music sensor control signal output to the CXA2510Q (IC321)
“L” is output to lower the gain for audio level at FF/REW

29

REL

I

Reel table rotation detect signal input from the take-up and supply reel sensor

30

MTLIN

I

Input terminal to set whether the auto metal function is present or not
“L”: auto metal function is present

31

POS3

I

32

POS2

I

33

GND

—

Ground terminal

34

POS0

I

35

POS1

I

Input of FM stereo detection signal from FM/AM tuner unit (TU1), and output of forced
monaural control signal to FM/AM tuner unit (TU1)  (Commonly used for stereo display input
and forced monaural output)    FM stereo detection at input of “L”, forced monaural at output
of “L”

Tape position detect input from the tape operation switch (S901)

Tape position detect input from the tape operation switch (S901)

– 23 –

36

LM LOD

O

Loading/tape operation motor (M902) control signal output to the MM1322XF (IC651)
(For the loading direction and forward side operation)  *1

37

LM EJ

O

Loading/tape operation motor (M902) control signal output to the MM1322XF (IC651)
(For the eject direction and reverse side operation)  *1

38

N/R OUT

O

Forward/reverse direction control signal output to the CXA2510Q (IC321)
“L: forward direction, “H”: reverse direction

39

NC

I

Not used (fixed at “H”)

40

CM ON

O

Capstan/reel motor (M901) drive signal output terminal    “H”: motor on

41

TAPEON

O

Tape system power supply on/off control signal output terminal    “H”: tape on

42

COLSEL

I

Setting terminal for the illumination color    “L”: amber, “H”: green (fixed at “H”)

43

RCIN1

I

Rotary remote commander shift key A/D input terminal

44

TEST

I

Setting terminal for the test mode    “L”: test mode (normally fixed at “H”)

45

ILLON

O

Power supply on/off control signal output terminal at the illumination and liquid crystal display
driver (IC901)    “H”: power on

46

BEEP

O

Beep sound output terminal

47

MUTE

O

Muting control signal output terminal    “H”: mute on

48

VOLCE

O

Chip enable output to the electrical volume (IC351)

49

SUBCE

O

Chip enable output terminal    Not used this set (open)

50

VOLCKO

O

Serial data transfer clock signal output to the electrical volume (IC351)

51

SUBCKO

O

Serial data transfer clock signal output terminal    Not used this set (open)

52

VOLSO

O

Serial data output to the electrical volume (IC351)

53

TAPMUT

O

Tape mute on/off control signal output to the CXA2510Q (IC321)    “H”: tape mute on

54

DOLON

O

Dolby on/off control signal output to the CXA2510Q (IC321)    “H”: dolby on

55

DOLBC

I

Setting terminal for dolby type    “L”: dolby B and C type, “H”: dolby B type only (fixed at “H”)

56

AMSIN

I

Whether a music is present or not from CXA2510Q (IC321) is detected at auto music sensor
“L”: music is present, “H”: music is not present

57

MTLSEL

O

Tape metal position control signal output to the CXA2510Q (IC321)    “H”: metal on

58

AD ON

O

Power supply on/off control signal output for the A/D converter    “L”: power on

59

RAMBU

I

Internal RAM reset detection signal input from the RN5VD23AA (IC552)    Input terminal to
check that RAM data are not destroyed due to low voltage    This checking is made within
100msec after reset

60

RESET

I

System reset signal input from the reset signal generator (IC551)
“L” is input for several 100msec after power on, then it changes to “H”

61

SIRCS

I

Sircs signal input terminal    Not used this set (fixed at “H”)

62

BUIN

I

Battery detect signal input terminal    “H”: battery on

63

PW SEL

I

Power select switch (S701) input terminal    “L”: off (halt mode), “H”: on (operation mode)

64

ACCIN

I

Accessory detect signal input terminal    “L”: accessory on

65

NOSESW

I

Detects the removal of the attaching and removing type front panel block    “L”: attaching

66

TELMUTE

I

Telephone mute signal input terminal    At input of “L”, the signal is attenuated by –20dB

67

KEYACK

I

Input of acknowledge signal for the key entry    Acknowledge signal is input to accept function
and eject keys in the power off status    On at input of “L”

68

VDD

—

Power supply terminal (+5V)

69

X OUT

O

Main system clock output terminal (5MHz)

70

X IN

I

Main system clock input terminal (5MHz)

71

GND

—

Ground terminal

– 24 –

72

XT OUT

O

Sub system clock output terminal (32.768kHz)

73

XT IN

I

Sub system clock input terminal (32.768kHz)

74

AVDD

—

Power supply terminal (+5V) (for A/D converter)

75

AVREF0

I

Reference voltage input terminal (+5V) (for A/D converter)

76

KEYIN0

I

Key input terminal (A/D input)

77

KEYIN1

I

Key input terminal (A/D input)

78

D.BASS

I

D-BASS switch (SW951) input (A/D input)

79

VSM

I

FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)

80

KEYSEL

I

Setting terminal for the key (fixed at center voltage)

*1  motor control

                     MODE

 TERMINAL

LM LOD (pin 

#§)

“L”

“H”

“L”

“H”

LM EJ (pin 

#¶)

“L”

“L”

“H”

“H”

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE