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– 17 –

•

µ

1

DSEL

I

Destination setting terminal    Frequency select switch (S502) input in this set
“L”: MW 9k step or FM 50k step, “H”: MW 10k step or FM 200k step

2

RC IN0

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

PLLCE

O

PLL serial chip enable output to the FM/AM PLL (IC1)

7

AVREF1

I

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

8

PLLSI

I

PLL serial data input from the FM/AM PLL (IC1)

9

PLLSO

O

PLL serial data output to the FM/AM PLL (IC1)

10

PLLCKO

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC1)

11

P-STIN

I

Polar stereo signal input terminal    Not used (fixed at “H”)

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 (IC701) (for SONY bus)

17

UNISO

O

Serial data output to the bus interface (IC701) (for SONY bus)

18

UNICKI

I

Serial data reading clock signal input terminal (for SONY bus)

19

UNICKO

O

Serial data transfer clock signal output to the bus interface (IC701) (for SONY bus)

20

BUSON

O

Bus on/off control signal output to the bus interface (IC701) (for SONY bus)    “L”: bus on

21

SYSRST

O

Reset signal output to the bus interface (IC701) (for SONY bus)    “L”: reset

22

AMPON

O

Standby control signal output to the power amplifier (IC611)    “L”: standby

23

AMP MUT

O

Muting control signal output to the power amplifier (IC611)    “L”: muting on

24

TUNON

O

Tuner system power supply on/off control signal output to the BA3918 (IC671)    “H”: tuner on

25

FM ON

O

FM system power supply on/off control signal output to the BA3918 (IC671)    “H”: FM on

26

PW ON

O

Main system power supply on/off control signal output to the BA3918 (IC671)    “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” in this set)

28

AMSON

O

Tape auto music sensor control signal output to the CXA2510AQ (IC301)
“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    Not used this function in this set (fixed at “H”)

31

POS3

I

32

POS2

I

33

GND

—

Ground terminal

34

POS0

I

35

POS1

I

36

LM LOD

O

Loading/tape operation motor control signal output to the LB1638M (IC361)
(For the loading direction and forward side operation)    *1

Tape position detect input from the tape operation switch on the mechanism block

Tape position detect input from the tape operation switch on the mechanism block

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”

– 18 –

37

LM EJ

O

Loading/tape operation motor control signal output to the LB1638M (IC361)
(For the eject direction and reverse side operation)    *1

38

N/R OUT

O

Forward/reverse direction control signal output to the CXA2510AQ (IC301)
“L: forward direction, “H”: reverse direction

39

P.ON

O

Polar stereo detection signal output terminal    “H”: polar stereo    Not used (open)

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

RC IN1

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

ILL ON

O

46

BEEP

O

Beep sound signal output terminal

47

MUT

O

Line muting control signal output terminal    “H”: line muting on

48

VOLCE

O

Chip enable signal output to the electrical volume (IC161)

49

SUBCE

O

Chip enable signal output terminal    Not used in this set (open)

50

VOLCKO

O

Serial data transfer clock signal output to the electrical volume (IC161)

51

SUBCKO

O

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

52

VOLSO

O

Serial data output to the electrical volume (IC161)

53

TAPMUT

O

Tape muting on/off control signal output to the CXA2510AQ (IC301)    “H”: tape muting on

54

DOLON

I/O

55

DOLBC

I/O

56

AMSIN

I

Whether a music is present or not from CXA2510AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present

57

MTLSEL

I/O

58

AD ON

O

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

59

RAMBU

I

60

RESET

I

System reset signal input from the reset signal generator (IC652) and reset switch (S503)
“L” is input for several 100 msec after power on, then it changes to “H”

61

SIRCS

I

Sircs signal input from the remote control receiver (IC902)

62

BU IN

I

Battery detect signal input terminal    “H”: battery on

63

PW SEL

I

Power select switch (S501) 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

TELMUT

I

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

Internal RAM reset detection signal input from the RN5VD23AA (IC651)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset

Power supply on/off control signal output terminal at the illumination and liquid crystal display
driver (IC901)    “H”: power on
At power select switch (S501) on mode: “H” output at the accessory on
At power select switch (S501) off mode: “H” output at the power on

Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function (“L” input: valid)
At normal mode: dolby on/off control signal output to the CXA2510AQ (IC301)
“H”: dolby on

Dolby B/C selection control in/out terminal
At initial mode: dolby B only/dolby B and C type selection input (“L” input: dolby B and C)
At normal mode: dolby type selection signal output    “L”: dolby B, “H”: dolby C
Not used this function (fixed at “H”)

METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function    “L”: manual mode
At manual mode: METAL on/off control signal output to the CXA2510AQ (IC301)
“H”: METAL on
At auto mode: input at MTLIN (pin #º)

– 19 –

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 “H”

68

VDD

—

Power supply terminal (+5V)

69

X OUT

O

Main system clock output terminal (5 MHz)

70

X IN

I

Main system clock input terminal (5 MHz)

71

GND

—

Ground terminal

72

XT OUT

O

Sub system clock output terminal (32.768 kHz)

73

XT IN

I

Sub system clock input terminal (32.768 kHz)

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

77

KEYIN1

I

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 “L”)

Key input terminal (A/D input)
OFF, SOURCE, MODE 

*, SEEK AMS + + ), SEEK AMS = 0 –, VOLUME –,

SEL, VOLUME +, DSPL, ATT keys input (LSW901 to LSW910)

Key input terminal (A/D input)
6, INTRO 1, REPEAT 2, SHUF/a 3, BL SKIP 6, ATA 5, BANK/MTL 4, BTM LCL, FILE,
PRESET DISC +/– keys input (LSW921 to LSW931)

*1  loading/tape operation motor control

                           MODE

 TERMINAL

LM LOD (pin #§)

“L”

“H”

“L”

“H”

LM EJ (pin #¶)

“L”

“L”

“H”

“H”

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

– 20 –

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

¢

: internal component.

•

C

: panel designation.

•

U

: B+ Line.

•

H

: adjustment for repair.

• Power voltage is dc 14.4V and fed with regulated dc power

supply from ACC and BATT cords.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
no mark : FM
(

) : MW/SW

〈〈

 

〉〉

: TAPE PLAYBACK

∗

: Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.
• Signal path.

F

: FM

f

: MW/SW

E

: TAPE PLAYBACK

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

• b

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Conductor Side)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Component Side)

the parts face are indicated.