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37

Pin No.

Pin Name

I/O

Description

35

DSPLAT

O

Serial data latch pulse output to the CXD2726Q (IC100)

36

DSPRST

O

Reset signal output to the CXD2726Q (IC100)    “L”: reset

37

NC

O

Not used (open)

38

DVCC

—

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

39

DVSS

—

Ground terminal (for D/A converter)

40, 41

NC

O

Not used (open)

42

AVCC

—

Power supply terminal (+5V) (for analog system)

43

AVRH

I

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

44

AVRL

I

Reference voltage (0V) input terminal (for A/D converter)

45

AVSS

—

Ground terminal (for analog system)

46

KEYIN0

I

Key input terminal (A/D input) (LSW901 to LSW908, S901 to S904)
OFF, SOURCE, SOUND EQ, MENU, PTY DSPL, LIST, ENTER, o MODE, SEEK/AMS - 
. m + > M, DISC/PRST +, DISC/PRST – keys input

47

KEYIN1

I

Key input terminal (A/D input) (LSW801, LSW909 to LSW917)
Z, DSO, TA, AF, 6 to 3 SHUF 2, REP 1 keys input

48

RCIN0

I

Rotary remote commander key input terminal (A/D input)

49

DSTSEL

I

Destination setting terminal (A/D input)    “L”: XR-C7500R/C7500RX: TYPE A,
 “M”: XR-C7500R/C7500RX: TYPE C, “H”: XR-C7500R/C7500RX: TYPE B

50

QUALITY

I

Noise level detection signal input at SEEK mode (A/D input)

51

FMAGC

I

FM AGC detection signal input from the FM/AM tuner unit (TUX1) (A/D input)

52

MPTH

I

Multi-path detection signal input from the RDS decoder (IC50) (A/D input)

53

VSM

I

FM and AM signal meter voltage detection input from the FM/AM tuner unit (TUX1) (A/D input)

54

VCC

—

Power supply terminal (+5V)

55

AMP ON

O

Standby on/off control signal output to the power amplifier (IC700)
“L”: standby mode, “H”: amp on

56

NS-MASK

O

Discharge control signal output for the noise detection circuit   “H”: discharge

57

MTLOUT

O

METAL on/off control signal output to the CXA2510AQ (IC250)    “H”: METAL on

58

REEL

I

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

59

LM-EJ

O

Motor drive signal output to the loading/tape operation motor drive (IC201)    “H” active
(For the eject direction and reverse side operation)    *1

60

LM-LOD

O

Motor drive signal output to the loading/tape operation motor drive (IC201)    “H” active
(For the loading direction and forward side operation)    *1

61

CM ON

O

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

62

TAPE ON

O

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

63

VSS

—

Ground terminal

64

NC

I

Not used (fixed at “L”)

65

POS0

I

66

POS1

I

67

POS2

I

68

POS3

I

69

FLASH-W

I

Internal flash memory data write mode detection signal input terminal    “L”: data write mode
Not used (fixed at “H”)

70

I2C SDA

I/O

Two-way data I

2

C bus with the FM/AM tuner unit (TUX1), RDS decoder (IC50) and electrical 

volume (IC10)

71

I2C SCL

O

I

2

C bus clock signal output to the FM/AM tuner unit (TUX1), RDS decoder (IC50) and electrical 

volume (IC10)

72

RCIN1

I

Rotary remote commander shift key input terminal

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

Description

73

X1A

O

Sub system clock output terminal (32.768 kHz)

74

X0A

I

Sub system clock input terminal (32.768 kHz)

75

DAVN

I

Data transmit completed detection signal input from the RDS decoder (IC50)    “H” active

76

CDON-ON

I

CD/MD on/off control signal input terminal (fixed at “L” in this set)

77

BU-IN

I

Battery detection signal input from the SONY bus interface (IC500) and battery detect circuit
“L” is input at low voltage

78

DSPREADY

I

Transfer enable signal input from the CXD2726Q (IC100)
“L”: transfer prohibition , “H”: transfer permission

79

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”

80

AD ON

O

A/D converter power control signal output terminal
When the KEYACK (pin ul) that controls reference voltage power for key A/D conversion input 
is active, “L” is output from this terminal to enable the input

81

ACCIN

I

Accessory detection signal input terminal    “L”: accessory on

82

FLASH ON

O

Power on/off control signal output of the illumination LED and liquid crystal display driver 
(IC800)    “H”: power on

83

PW-ON

O

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

84

TESTIN

I

Setting terminal for the test mode    “L”: test mode, Normally: fixed at “H”

85

RAMBU

I

Internal RAM reset detection signal input from the RAM reset (IC570)
Input terminal to check that RAM data are not destroyed due to low voltage
This checking is made within 100 msec after reset

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 (IC560) and reset switch (S500)
“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

ILLIN

I

Auto dimmer control illumination line detection signal input terminal
“L” is input at dimmer detection

96

TELATT

I

Telephone detection signal input terminal    At input of “H”, the signal is attenuated by –20 dB

97

EMPH

I

Emphasis control signal input terminal    Not used (open)

98

F CH

O

Frequency changing terminal     “H”: frequency change    Not used (open)

99 to 102

NC

O

Not used (open)

103

4V SEL

I

Input terminal of whether line driver is mounted or not is detected
“L”: line driver is not mounted, “H”: line driver is mounted

104

COL SEL

I

Setting terminal for the illumination color
“L”: 2 color (XR-C7500R), “H”: 1 color (XR-C7500RX)

105

AMPATT

O

Power amplifier muting on/off control signal output terminal    “H”: muting on

106

BOOT

O

Serial data output to the liquid crystal display drive controller (IC800)

107

DSP GAIN

O

Not used (open)

108

NC

O

Not used (open)

109

XR CDMD

I

Setting terminal for the internal mechanism tape or CD/MD
“L”: tape, “H”: CD/MD (fixed at “L” in this set)

110

DSP ON

O

Power supply on/off control signal output terminal    “H”: DSP on    Not used (open)

39

Pin No.

Pin Name

I/O

Description

111

CD MD

I

Setting terminal for the internal mechanism CD or MD
“L”: CD, “H”: MD (fixed at “L” in this set)

112

NC

I

Not used (fixed at “L”)

113

TUNON

O

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

114

NC

O

Not used (open)

115

REIN1

I

Dial pulse input of the rotary encoder (RE901) (A phase input) 
(for VOLUME/BASS/TREBLE/BALANCE/FADER control)

116

REIN0

I

Dial pulse input of the rotary encoder (RE901) (B phase input)
 (for VOLUME/BASS/TREBLE/BALANCE/FADER control)

117

NOSE-SW

I

Front panel block remove/attach detection signal input from the nose detection switch (S600)
“L”: front panel is attached

118

DOORIND

O

LED drive signal output of the tape window illumination and Z indicator (LED801, LSW801)
“H”: LED on    “H” is output to turn on LED when front panel is opened

119

VSS

—

Ground terminal

120

DOLBY

O

Dolby-B on/off select signal output to the CXA2510AQ (IC250)    “H”: dolby on

*1  Loading/tape operation motor control

STOP

LOADING/

FORWARD

EJECT/

REVERSE

BRAKE

LM-LOD (pin y; )

“L”

“H”

“L”

“H”

LM-EJ (pin tl )

“L”

“L”

“H”

“H”

Terminal

Mode

40

• 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.

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

X-3378-397-1 PANEL ASSY, SUB

* 2

1-676-603-12 SUB BOARD

3

1-792-195-11 CABLE, FLEXIBLE FLAT

4

X-3377-621-2 LOCK ASSY

5

3-040-990-01 BUTTON (EJECT) (Z)

6

3-935-003-01 SPRING, TORSION

7

3-027-437-12 DOOR, CASSETTE

8

X-3376-699-2 GEAR ASSY

9

3-713-786-51 SCREW +P 2X3

10

3-030-909-02 DAMPER, OIL

* 11

3-040-994-01 CHASSIS

* 12

3-040-995-01 COVER

13

3-915-923-01 SCREW, GROUND POINT

14

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

14

1-776-527-71 CORD (WITH CONNECTOR) (ISO) (POWER)

(EXCEPT E)

* 15

3-045-828-01 INSULATED PLATE

16

3-012-859-01 CAP (25), RUBBER

* 17

3-045-878-01 PLATE (TU), GROUND

* 18

3-045-877-01 CUSHION (TU)

* 19

A-3326-274-A MAIN BOARD, COMPLETE (C7500R: TYPE A)

* 19

A-3326-278-A MAIN BOARD, COMPLETE (C7500R: TYPE B)

* 19

A-3326-280-A MAIN BOARD, COMPLETE (C7500R: TYPE C)

* 19

A-3326-284-A MAIN BOARD, COMPLETE (C7500RX: TYPE A)

* 19

A-3326-288-A MAIN BOARD, COMPLETE (C7500RX: TYPE B)

* 19

A-3326-290-A MAIN BOARD, COMPLETE (C7500RX: TYPE C)

* 20

3-040-998-01 BRACKET (IC)

* 21

3-041-262-01 HEAT SINK (REG/XR)

* 22

3-040-996-22 HEAT SINK (2P)

* 23

3-046-991-01 SPACER (COVER R)

* 24

3-046-990-01 SPACER (COVER L)

F1

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

TUX1

A-3220-738-A FM/AM TUNER UNIT (TUX-020)

• Hardware (# mark) list and accessories and

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

• Please refer to servicing notes (page 2) for

system of TYPE A, B and C.