DOWNLOAD Sony XR-1800 / XR-1803 / XR-1804 Service Manual ↓ Size: 2.41 MB | Pages: 34 in PDF or view online for FREE

– 13 –

Tape Speed Adjustment

RV1 MW Auto Scan/Stop Level Adjustment

TU100

RV2 FM Auto Scan/Stop Level Adjustment

RV3 FM Noise Focus Adjustment

RV4 FM Stereo Separation Adjustment

CN901

S1

FREQUENCY

SELECT
SWITCH

10 k (MW)

200 k (FM)

9 k (MW)

50 k (FM)

↔

TP2 (SD)

– SET BOTTOM VIEW –

– SET UPPER VIEW –

– 14 –

•

1

XIN

I

System clock input terminal (4.5 MHz)

2

TEST2

I

Connected to ground

3

NC

I

Not used (fixed at “H”)

4

AM-SD

I

AM signal meter voltage detection input from the FM/AM tuner unit (TU100)    “H” active

5

FM-SD

I

FM signal meter voltage detection input from the FM/AM tuner unit (TU100)    “H” active

6

STEREO

I

Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo 
display input)  FM stereo detection at input of “L”

7

MOTOR

O

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

8

AMP-MUTE2

O

Muting control signal output to the power amplifier (IC500)    “L”: muting on

9

MW/SW

O

MW/SW selection signal output to the FM/AM tuner unit (TU100)    “H”: MW, “L”: SW               
Used for the XR-1804 only

10

—

O

Not used (open)

11

BEEP

O

Beep sound signal output terminal    “H” active

12

POWER-ON

O

Power on/off control signal output    “H”: power on

13

ILL-ON

O

Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp 
and back light lamp    “H”: power on

14

N/R

I

Tape direction switch (S901) input terminal    “H”: forward side, “L”: reverse side

15

TAPE-IN

I

Tape in detection switch (S903) input terminal    “L”: tape in

16

FF-REW

I

FF/REW detection switch (S902) input terminal    “L”: FF/REW mode

17

K1

I

Key matrix return signal input terminal    Not used (fixed at “L”)

18

K0

I

Key matrix return signal input terminal

19

AMP-ON

O

Standby on/off signal output to the power amplifier (IC500)    “L”: standby, “H”: amp on

20

SEEK

O

Seek control signal output to the FM/AM tuner unit (TU100)    “H” active                                       
Used for the XR-1800: E model only

21

SEEK

O

Seek control signal output to the FM/AM tuner unit (TU100)    “L” active                                        
Used for the except XR-1800: E model

22

LOCAL/DX

O

Local/DX selection signal output to the FM/AM tuner unit (TU100)    “L”: DX, “H”: local

23, 24

—

O

Not used (open)

25

T2

O

Key matrix scan signal output terminal    Used for the XR-1800: E model and XR-1804

26

T1

O

Key matrix scan signal output terminal    Not used (open)

27

T0

O

Key matrix scan signal output terminal    Used for the XR-1800: AEP, UK models

28

VOL-CE

O

Chip enable signal output to the electrical volume (IC450)    “H” active

29

VOL-DI

O

Serial data output to the electrical volume (IC450)    “H” active

30

VOL-CL

O

Serial data transfer clock signal output to the electrical volume (IC450)

31

VDD

—

Power supply terminal (+5V)

32

MUTE-REQ

I

Muting request signal input terminal (“H” active)    “L”: accessory on, “H”: accessory off

33

BAND-KEY

I

TUNER switch (S900) input terminal    “L” is input when pressing the switch

34

PANEL-IN

I

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

35

NC

I

Not used (fixed at “L”)

36 to 40

—

O

Not used (open)

41

MUTE

O

Audio muting on/off control signal output terminal    “H”: muting on    Not used (open)

42

—

O

Not used (open)

43

AMP-MUTE

O

Amp muting on/off control signal output terminal    “L”: muting on    Not used (open)

44

ANT-REM

O

Control signal output for the external power antenna and external amplifier    “H” active

45 to 48

—

O

Not used (open)

– 15 –

49

KS2

O

50

KS1

O

Key matrix scan signal output terminal

51

KS0

O

52

—

O

Not used (open)

53

LCD-CLK

O

Serial data transfer clock signal output to the liquid crystal display driver (IC900)

54

LCD-CE

O

Chip enable signal output to the liquid crystal display driver (IC900)    “H” active

55

LCD-DATA

O

Serial data output to the liquid crystal display driver (IC900)    “H” active

56

AM-ON

O

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

57

MONO

O

Not used (open)

58 to 60

—

O

Not used (open)

61

FM-ON

O

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

62

TUNER-ON

O

Tuner system power supply on/off control signal output terminal    “H”: tuner on                             
Not used (open)

63

MW/LW

O

MW/LW selection signal output terminal    “L”: MW, “H”: LW    Not used (open)

64, 65

—

O

Not used (open)

66

NC

I

Not used (fixed at “L”)

67

CE

I

Accessory switch on/off detection signal input terminal                                                                     
“H”: accessory on, “L”: accessory off (hold mode)

68

RESET

I

System reset signal input terminal    “L”: reset

69

KEY-IN

I

Key matrix return signal input terminal (A/D input)

70

IFIN

I

FM and AM intermediate frequency detection signal input from the FM/AM tuner unit (TU100)

71

NC

I

Not used (fixed at “L”)

72

BU-CHECK

I

Battery detect signal input terminal

73

VDD

—

Power supply terminal (+5V)

74

FMIN

I

FM local oscillator input from the FM/AM tuner unit (TU100)

75

AMIN

I

AM local oscillator input from the FM/AM tuner unit (TU100)

76

VSS

—

Ground terminal

77

EO

O

Main charge-pump control signal output terminal

78

—

O

Not used (open)

79

TEST1

I

Connected to ground

80

XOUT

O

System clock output terminal (4.5 MHz)

– 16 –

1

IC1 

1

 (XIN)

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.

•

2

: nonflammable resistor.

•

C

: panel designation.

•

U

: B+ Line.

• 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 (XR-1804 only)

[

] : TAPE PLAYBACK

• 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 (LW/SW)

E

: TAPE PLAYBACK

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

•

¢

: internal component.

• b

: Pattern from the side which enables seeing.

2 Vp-p

222 ns