DOWNLOAD Sony XR-1800R Service Manual ↓ Size: 2.05 MB | Pages: 39 in PDF or view online for FREE

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1

4

3

6

5

8

7

10

9

12

11

14

13

16
15

43

44

41

42

39

40

37

38

35

36

33

34

23

24

25

26

19

20

21

22

29

30

31

32

27

28

17

18

DECODER

LATCH

CONTROL

SHIFT

REGISTER

ROUT

RFIN

RFOUT

RROUT

RVREF

VREF

LVREF

LROUT

LFOUT

LFIN

LOUT

R2

R1

TEST

VSS

NC

CL

DI

CE

L2

VDD

L1

LT3

LT2

L10dBOUT

LT1

LIN

LCT2

LCT1

L10dBIN

LSELO

L3

NC

RT3

RT2

RT1

RIN

R10dBOUT

RCT2

RCT1

R10dBIN

RSELO

NC

R3

+
–

+
–

+ 
–

+

–

LVREF

LVREF

RVREF

LVREF

LVREF

LVREF

LVREF

LVREF

LVREF

+

–

+

–

+

–

+

–

+

–

+ 
–

RVREF

RVREF

RVREF

RVREF

RVREF

RVREF

RVREF

+ 
–

+ 
–

+ 
–

+ 
–

– 31 –

•

Pin No.

Pin Name

I/O

Function

1

TUNMUT

O

FM audio signal muting control output terminal    “H”: muting on

2

AMPON

O

Standby control signal output to the power amplifier  (IC500)    “L”: standby

3

ILLON

O

Power supply on/off control signal output terminal at the illumination and liquid crystal display 
driver (IC900)    “H”: power on

4

PW ON

O

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

5

AMPMUTE

O

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

6

NIL

I

Not used (fixed at “L”)

7

VDD1

—

Power supply terminal (+5V)

8

X IN

I

Main system clock input terminal (8 MHz)

9

X OUT

O

Main system clock output terminal (8 MHz)

10

GND

—

Ground terminal

11

XT IN

I

Sub system clock input terminal (32.768 kHz)

12

XT OUT

O

Sub system clock output terminal (32.768 kHz)

13

EX2

I

Connected to ground

14

RESET

I

System reset signal input from the reset signal generator (IC50) and reset switch (S2)
“L” is input for several 100 msec after power on, then it changes to “H”

15

RDSCKI

I

Serial data transfer clock signal input from the RDS decoder (IC150)

16

BU IN

I

Battery detect signal input terminal    “H”: battery on

17

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”

18

VOLSO

O

Serial data output to the electrical volume  (IC450)

19

VOLCKO

O

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

20

VOLCE

O

Chip enable signal output to the electrical volume  (IC450)

21

TAPE MUTE

O

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

22 to 24

NCO

O

Not used (open)

25

AMS ON

O

Tape auto music sensor control signal output terminal
“L” is output to lower the gain for audio level at FF/REW    Not used (open)

26

ATA ON

I

Not used (fixed at “H”)

27

TAPE IN

I

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

28

FF-REW IN

I

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

29

N/R

I

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

30

RDSSI

I

Serial data input from the RDS decoder (IC150)

31

AD ON

O

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

32, 33

NCO

O

Not used (open)

34

CM ON

O

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

35

TAPE ON

O

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

36

ACC IN

I

Accessory detect signal input terminal    “L”: accessory on

37

PLLSI

I

PLL serial data input from the FM/AM PLL (IC121)

38

BEEP

O

Beep sound signal output terminal

39

PLLSO

O

PLL serial data output to the FM/AM PLL (IC121)

40

PLLCLK

O

PLL serial data transfer clock signal output to the FM/AM PLL (IC121)

41

PLLCE

O

PLL serial chip enable output to the FM/AM PLL (IC121)

42

LCD INH

O

Blank indicate control signal output to the liquid crystal display driver (IC900)                                
“L”: no display

– 32 –

Pin No.

Pin Name

I/O

Function

43

LCD CE

O

Chip enable output to the liquid crystal display driver (IC900)

44

LCD CLK

O

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

45

NCO

O

Not used (open)

46

LCD SO

O

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

47

VDD2

—

Power supply terminal (+5V)

48

AVDD

—

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

49

AVREF+

I

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

50

KEYIN1

I

Key input terminal (A/D input)    OFF, PTY, LOUD, 6/5/3/2/4/1 ATA keys input (S950 to 957)

51

KEYIN0

I

Key input terminal (A/D input)    AF/TA, TUNER BTM, SEEK MANU +/–, DSPL, LEVEL +, 
SEL, LEVEL – keys input (S920 to 927)

52

KEYSEL1

I

Setting terminal for the key function (fixed at “L”)

53

KEYSEL0

I

Setting terminal for the key function (fixed at “L”)

54

DSTSEL1

I

Destination setting terminal (fixed at “L”)

55

DSTSEL0

I

Destination setting terminal (fixed at “L”)

56

NIL

I

Not used (fixed at “L”)

57

FM VSM

I

FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)

58

AVREF–

I

Reference ground terminal

59

AVSS

—

Ground terminal (for A/D converter)

60

GND

—

Ground terminal

61, 62

NCO

O

Not used (open)

63

SEEK OUT

O

Seek control signal output to the FM/AM tuner unit (TU100)

64

TUN ON

O

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

65

FM ON

O

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

66

MUTE

O

Line muting control signal output terminal    “H”: line muting on    Not used (open)

67

AF SEEK

O

PLL low-pass filter time constant selection signal output at AF seek
“H” is output when AF seek

68

NCO

O

Not used (open)

69

NOSESW

I

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

70

ST IN

I/O

71

SD IN

I

Station detector detect input from the FM/AM tuner unit (TU100)                                                     
Stop level for SEEK, BTM, etc. is determined    SD is present at input of “H”

72

NIL

I

Not used (fixed at “L”)

73

PW SEL

I

Power select switch input terminal
“L”: halt mode, “H”: operation mode    Not used (fixed at “L” in this set)

74 to 78

NIL

I

Not used (fixed at “L”)

79

TEST

I

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

80

NIL

I

Not used (fixed at “L”)

Input of FM stereo detection signal from FM/AM tuner unit (TU100), and output of forced 
monaural control signal to FM/AM tuner unit (TU100)  (Commonly used for stereo display 
input and forced monaural output) 
FM stereo detection at input of “L”, forced monaural at output of “L”

– 33 –

• Items marked “*” are not stocked since they

are seldom required for routine service. Some
delay should be anticipated when ordering
these items.

• The mechanical parts with no reference num-

ber in the exploded views are not supplied.

• Hardware (# mark) list and accessories and

packing materials are given in the last of the
electrical parts list.

NOTE:

• -XX and -X mean standardized parts, so they

may have some difference from the original
one.

• Color Indication of Appearance Parts

Example:
KNOB, BALANCE (WHITE) . . . (RED)

↑

↑

Parts Color Cabinet's Color

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

1

3-022-475-01 PANEL, SUB

2

X-3367-636-1 LOCK ASSY

3

3-924-404-11 DOOR, CASSETTE

4

3-377-892-01 SPRING (C DOOR), TORSION

* 5

3-022-479-01 BRACKET (MD)

6

3-937-529-01 COVER (FF/REW)

7

3-937-528-01 COVER (EJECT)

8

3-376-464-11 SCREW(+PTT 2.6X6),GROUND POINT

9

3-029-047-01 PLATE (C), GROUND

* 10

X-3375-529-1 COVER ASSY

* 11

3-022-470-01 BRACKET (IC)

12

1-776-527-31 CORD (WITH CONNECTOR) (ISO) (POWER)

* 13

3-022-477-01 HEAT SINK

* 14

A-3317-253-A MAIN BOARD, COMPLETE (AEP, UK, SE)

* 14

A-3317-255-A MAIN BOARD, COMPLETE (G)

* 15

3-022-487-01 SHEET, INSULATING

* 16

3-022-476-01 CHASSIS, MAIN

17

3-338-263-01 CUSHION (U)

* 18

3-022-469-01 SPRING GROUND

F901

1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) (10A)

#3

#2

#2

#2

#2

#2

F901

Front panel section

#1

#4

#4

MG-36SZ9-32

• Abbreviation

G

: German

SE

: South European