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33

Pin No.

Pin Name

I/O

Description

75

DAVN

I

Data transmit completed detect signal input from the RDS decoder (IC51)    “H” active

76

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”

77

BU-IN

I

Battery detect signal input from the SONY bus interface (IC701) and battery detect circuit
“L” is input at low voltage    IC701: Used for the XR-C33R only

78

ILL IN

I

Auto dimmer control illumination line detection signal input terminal
“L” is input at dimmer detection    Fixed at “L” in this set

79

TEL-ATT

I

Telephone muting signal input terminal    At input of “H”, the signal is attenuated by –20 dB
Not used (open)

80

NOSESW

I

Front panel block remove/attach detection signal input terminal
“L”: front panel is attached

81

ACC IN

I

Accessory detect signal input terminal    “L”: accessory on

82 to 85

NCO

O

Not used (open)

86

HSTX

I

Hardware standby input terminal    “L”: hardware standby mode    Reset signal input in this set

87

MD2

I

Setting terminal for the CPU operational mode (fixed at “L” in this set)

88, 89

MD1, MD0

I

Setting terminal for the CPU operational mode (fixed at “H” in this set)

90

RESET

I

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

91

VSS

—

Ground terminal

92

X0

I

Main system clock input terminal (3.68 MHz)

93

X1

O

Main system clock output terminal (3.68 MHz)

94

VCC

—

Power supply terminal (+5V)

95 to 99

NCO

O

Not used (open)

100

9K/10K

I

AM frequency step (9 kHz or 10 kHz) selection signal input terminal
“L”: 9 kHz, “H”: 10 kHz    Not used (open)

101

NCO

O

Not used (open)

102

MTLIN

I

Auto metal detection signal input terminal    “L”: auto metal    Fixed at “L” in this set

103

AMSIN

I

Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present

104

REEL

I

Rotation detect signal input from supply reel sensor and take-up reel sensor on the deck
mechanism

105

POS0

I

106

POS1

I

107

POS2

I

108

POS3

I

109

LM-EJ

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the eject direction and reverse side operation)    *1

110

LM-LOD

O

Motor drive signal output to the loading/tape operation motor drive (IC361)    “H” active
(For the loading direction and forward side operation)    *1

111

CM-ON

O

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

112

TAPEON

O

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

113

N-ROUT

O

Forward/reverse direction control signal output to the CXA2509AQ (IC301)
“L”: forward direction, “H”: reverse direction

114

AMSON

O

Tape auto music sensor control signal output to the CXA2509AQ (IC301)
“L” is output to lower the gain for audio level at FF/REW mode

115

MTLON

I/O

Tape position (EJECT/FF/REW/
REV/FWD mode) detect input from
the tape operation switch on the deck
mechanism

POS0: “L”: EJECT mode, “H”: others mode
POS1: “L”: FF and FWD mode, “H”: others mode
POS2: “L”: REW mode, “H”: others mode
POS3: “L”: REV and EJECT mode, “H”: others mode

METAL control in/out terminal
At initial mode: auto/manual mode selection input of METAL function (manual at “L” input)
At manual mode: METAL on/off control signal output terminal (METAL on at “H” output)
At auto mode: input at MTLIN (pin <z/x)

34

Pin No.

Pin Name

I/O

Description

116

DOLON

I/O

Dolby control in/out terminal
At initial mode: valid/invalid selection input of dolby function (valid at “L” input)
At normal mode: dolby on/off control signal output terminal (dolby on at “H” output)
Not used this function (fixed at “H”)

117

TAPE MUTE

O

Tape muting on/off control signal output to the CXA2509AQ (IC301)    “H”: muting on
Active at ATA, FF/REW mode

118

AMP ON

O

Standby on/off control signal output to the power amplifier (IC611)
“L”: standby mode, “H”: amp on

119

VSS

—

Ground terminal

120

POWON

O

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

*1  Loading/tape operation motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LM-LOD (pin <zz/)

“L”

“H”

“L”

“H”

LM-EJ (pin <z/.)

“L”

“L”

“H”

“H”

Mode

Terminal

35

• 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

3-030-828-01 PANEL, SUB

2

X-3367-636-1 LOCK ASSY

3

3-027-437-41 DOOR, CASSETTE

4

3-935-003-01 SPRING, TORSION

* 5

A-3326-071-A MAIN BOARD, COMPLETE (3100R)

* 5

A-3326-073-A MAIN BOARD, COMPLETE (C33R: AMBER)

* 5

A-3326-106-A MAIN BOARD, COMPLETE (C33R: GREEN)

* 6

3-031-828-01 BRACKET (REG. IC)

* 7

3-019-147-01 BRACKET (IC) (M)

* 8

3-031-050-02 HEAT SINK (C33R)

* 8

3-031-056-01 HEAT SINK (3100R)

9

3-915-923-01 SCREW, GROUND POINT

* 10

X-3373-269-1 COVER ASSY (ISO)

11

3-012-859-01 CAP (25), RUBBER

12

3-937-650-01 PLATE (C), GROUND

13

1-782-093-11 CORD (WITH CONNECTOR) (ISO-S)

(SPEAKER)

14

1-777-989-21 CORD (WITH CONNECTOR) (AMP REM)

(C33R)

15

1-782-092-11 CORD (WITH CONNECTOR) (ISO-P) (POWER)

16

3-935-014-01 CUSHION (U)

* 17

3-009-306-01 SHEET, INSULATING

* 18

3-009-813-43 CHASSIS

19

3-042-244-11 SCREW (T)

F801

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

TU1

1-693-440-23 TUNER UNIT (FM/AM TUNER UNIT)

#2

#2

#2

#2

#2

#2

F801

#2

#3

#4

MG-25G-136

Front panel section

#2

not supplied

TU1

• Abbreviation

AMBER : Amber illumination type
GREEN : Green illumination type

36

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

51

3-030-835-01 BUTTON (1-6) (OFF. SHIFT. 1. 2. 3. 4. 5. 6)

52

3-030-837-01 BUTTON (D-BASS)

53

3-030-838-03 BUTTON (RELEASE)

54

3-932-475-01 SPRING (RELEASE)

55

X-3378-491-1 PANEL SUB ASSY (C33R)

55

X-3378-492-1 PANEL SUB ASSY (3100R)

56

3-030-834-01 BUTTON (M/S) (MODE o. SOUND)

57

3-030-836-01 BUTTON (D/P/A)

(Z. – DISC +. DSPL. PTY. AF/TA) (C33R)

57

3-031-027-01 BUTTON (P/P/A)

(Z. – PRST +. DSPL. PTY. AF/TA) (3100R)

58

3-030-831-02 BUTTON (SOURCE)

59

3-030-830-01 KNOB (VOL)

60

3-030-832-01 LEVER (S/A) (+. –)

* 61

3-030-840-01 PLATE (B), GROUND

* 62

3-030-839-01 SHEET (REFLECTOR)

* 63

3-030-824-01 PLATE, LIGHT GUIDE

64

1-694-508-11 CONDUCTIVE BOARD, CONNECTION

* 65

3-030-825-01 HOLDER (LCD)

66

3-030-827-01 PANEL, FRONT BACK

LCD901 1-803-497-11 DISPLAY PANEL, LIQUID CRYSTAL

LCD901

#5

not supplied
(KEY board)