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– 37 –

Pin No.

Pin Name

I/O

Function

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

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

80

NOSESW

I

Front panel block remove/attach detection switch (S504) 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

MD1

I

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

89

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

Frequency select switch (S502) input terminal
“L”: AM 9 kHz/FM 50 kHz step, “H”: AM 10 kHz/FM 200 kHz step
Used for the XR-C7300/C7300W only

101

NCO

O

Not used (open)

102

NCO

I

Not used (open)

103

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

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 CXA2510AQ (IC301)
“L”: forward direction, “H”: reverse direction

114

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 mode

115

MTLON

I/O

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 to the CXA2510AQ (IC301)
(METAL on at “H” output)
At auto mode: input at MTLIN (pin `⁄‚¤)

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

– 38 –

Pin No.

Pin Name

I/O

Function

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 to the CXA2510AQ (IC301)
(dolby on at “H” output)

117

TAPE MUTE

O

Tape muting on/off control signal output to the CXA2510AQ (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 `⁄⁄‚)

“L”

“H”

“L”

“H”

LM-EJ (pin `⁄‚·)

“L”

“L”

“H”

“H”

Mode

Terminal

– 39 –

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

3-031-048-01 COLLAR (C7220/C7300)

1

3-031-048-11 COLLAR (C7300W)

2

X-3376-749-1 PANEL ASSY, SUB

3

X-3376-699-1 GEAR ASSY

4

3-027-437-11 DOOR, CASSETTE

5

3-935-003-01 SPRING, TORSION

6

3-031-188-01 BUTTON (EJECT) (

6)

* 7

1-673-172-11 SUB BOARD

8

X-3376-700-1 LOCK ASSY

* 9

3-031-189-01 SHEET, INSULATING

* 10

X-3373-269-1 COVER ASSY (ISO)

11

3-915-923-01 SCREW, GROUND POINT

12

3-012-859-01 CAP (25), RUBBER

13

3-937-650-01 PLATE (C), GROUND

14

1-776-207-72 CORD (WITH CONNECTOR) (POWER)

15

3-935-014-01 CUSHION (U)

* 16

A-3317-359-A MAIN BOARD, COMPLET (C7220)

* 16

A-3317-360-A MAIN BOARD, COMPLET (C7300/C7300W)

* 17

3-031-828-01 BRACKET (REG. IC)

* 18

3-018-390-01 BRACKET (IC)

* 19

3-031-023-01 HEAT SINK

* 20

3-031-049-01 CHASSIS

F801

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

• 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.

F801

MG-25G-136

#3

#3

#3

#4

#3

#3

#3

#2

#2

Front panel section

#1

#5

B

B

A

A

– 40 –

Ref. No.

Part No.

Description

Remark

Ref. No.

Part No.

Description

Remark

51

3-031-089-01 BUTTON (1-6) (OFF. SHIFT. 1. 2. 3. 4. 5. 6)

52

3-031-093-01 BUTTON (OPEN) (C7220/C7300)

52

3-031-093-11 BUTTON (OPEN) (C7300W)

53

3-935-151-01 SPRING (OPEN)

54

3-031-091-01 BUTTON (D-BASS) (C7220/C7300)

54

3-031-091-11 BUTTON (D-BASS) (C7300W)

55

X-3376-560-1 PANEL SUB ASSY (C7220)

55

X-3376-898-1 PANEL SUB ASSY (C7300)

55

X-3377-199-1 PANEL SUB ASSY (C7300W)

56

3-031-064-01 BUTTON (D/F/D) (+ DISC –. LIST. DSPL)

57

3-031-088-01 BUTTON (M/S) (MODE 

*. SOUND)

58

3-031-047-01 LEVER (S/A) (+. –) (C7220/C7300)

58

3-031-047-11 LEVER (S/A) (+. -) (C7300W)

* 59

3-031-326-01 PLATE (A), GROUND

60

1-694-507-11 CONDUCTIVE BOARD, CONNECTION

* 61

3-031-092-01 SHEET (REFLECTOR)

* 62

3-034-309-01 PLATE, LIGHT GUIDE

* 63

3-034-310-01 HOLDER (LCD)

64

3-031-046-01 BUTTON (SOURCE)

65

3-031-045-01 KNOB (VOL) (C7220/C7300W)

65

3-031-045-11 KNOB (VOL) (C7300)

66

3-031-086-01 PLATE (VOL), LIGHT GUIDE

67

X-3376-751-1 PANEL ASSY, FRONT BACK

LCD901 1-803-494-11 DISPLAY PANEL, LIQUID CRYSTAL

#8

not supplied
(KEY board)

LCD901

#8