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– 17 –

[SOURCE]

button: FM

Procedure:
1. Tune the set to 69.5 MHz, and set the internal modulation level

of the FM RF signal generator to 10 kHz deviation (20%).

2. Connect the frequency counter to the TP (VCO) on MAIN

board.

3. Adjust RV402 so that the reading on the frequency counter

becomes to 31.25 ± 0.1 kHz.

Adjustment Location:  See page 18.

[SOURCE]

button: FM

Procedure:
1. Connect the level meter to the TP (PLT) on MAIN board.
2. Set the modulation frequency of the FM RF signal generator

to 1 kHz, 40 kHz deviation (80 %)

3. Then output level is supposing that (A) dB.
4. Set the modulation frequency of the FM RF signal generator

to 31.25 kHz, 10 kHz deviation (20%)

5. Adjust L401 so that the reading on the level meter becomes to

maximum.

6. Adjust RV401 so that the reading on the level meter becomes

to (A) + 13.0 dB ± 0.5 dB.

Adjustment Location:  See page 18.

set

FM RF signal

generator

antenna jack (J1)

Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)

    

TP (VCO)

MAIN board

frequency counter

+

–

set

FM RF signal

generator

antenna jack (J1)

Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)

    

TP (PLT)

MAIN board

level meter

+

–

– 18 –

– MAIN BOARD (CONDUCTOR SIDE) –

– SET  UPPER  VIEW –

TP

(VCO)

TU1

IC401

J1

antenna jack

TP

(PLT)

TP (DOLBY R)
TP (GND)
TP (DOLBY L)

S701

power select

switch

A

(ON)

↑

B

(OFF)

Tape Speed Adjustment

RV4 FM Stereo Separation Adjustment

RV221
(R-CH)

RV121
(L-CH)

DOLBY Level

Adjustment

RV2 FM Auto Scan/Stop Level Adjustment

RV1 AM (MW) Auto Scan/Stop Level Adjustment

TU1

Sub Carrier Adjustment

RV402 VCO Frequency Adjustment

RV401
L401

        

 





– 19 –

•

µ

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

PLLCE

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

P-STIN

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 (for SONY bus)

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)    “L”: standby

23

AMPMUTE

O

Muting control signal output to the power amplifier (IC471)    “L”: muting on

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    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 (IC651)
(For the loading direction and forward side operation)    *1

37

LM EJ

O

Loading/tape operation motor control signal output to the LB1638M (IC651)
(For the eject direction and reverse 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”

– 20 –

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

CMON

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

46

BEEP

O

Beep sound output terminal

47

MUTE

O

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

48

VOLCE

O

Chip enable signal output to the electrical volume (IC351)

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 (IC351)

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 (IC351)

53

TAPMUT

O

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

54

DOLON

I/O

55

DOLBC

I/O

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

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 (IC551)
“L” is input for several 100 msec after power on, then it changes to “H”

61

SIRCS

I

Sircs signal input terminal    Not used in 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 muting signal input terminal    At input of “L”, the signal is attenuated by –20 dB

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”

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 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 (S701) on mode: “H” output at the accessory on
At power select switch (S701) 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 CXA2510Q (IC321)
“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 CXA2510Q (IC321)
“H”: METAL on
At auto mode: input at MTLIN (pin #º)