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– 25 –

R742

1.2k  1/2W

R792

1.2k  1/2W

(Page 14)

(Page 14)

(Page 14)

The components identified by mark 

!

 or dotted

line with mark 

!

 are critical for safety.

Replace only with part number specified.

– 26 –

•

µ

Pin No.

Pin Name

I/O

Description

1 to 7

DIG7 to DIG1

O

Digit drive signal output to the fluorescent indicator tube (FL201)

8

VDD

—

Power supply terminal (+5V)

9

S.CLK

O

Serial data transfer clock signal output to the LC78212 (IC401), PLL IC on FM/AM tuner pack    
“L” active

10

S.DATA

O

Serial data output to the LC78212 (IC401), PLL IC on FM/AM tuner pack    “L” active

11

PLL.DATA

I

Serial data input from the PLL IC on FM/AM tuner pack    “L” active

12

S.CE (LC7822)

O

Serial chip enable signal output to the LC78212 (IC401), PLL IC on FM/AM tuner pack
“H” active

13

S.CE (LV1010)

O

Serial chip enable signal output terminal     “L” active    Not used (pull down)

14

REAR-RY

O

Relay drive signal output for the rear side speaker    “H”: relay on    Not used (open)

15

BRIDGE

O

Bridgeable relay drive signal output terminal    “H”: relay on    Not used (open)

16

PROTECT

I

Over load detect signal input from the protect circuit    “L”: protect detect

17

RESET

I

System reset signal input from the reset signal generator (IC950, Q201)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”

18

AUTO-STOP

I

Tuned display detection signal input from the FM/AM tuner pack    “L”: tuned

19

STEREO-IN

I

Stereo detection signal input from the FM/AM tuner pack    “L”: stereo

20

AVSS

—

Ground terminal (for A/D converter analog system)

21

SP-RY

O

Relay drive signal output for the speaker protect    “H”: relay on

22

SURR-RY

O

Relay drive signal output for the surround speaker    “H”: relay on    Not used (pull down)

23

POWER-RY

O

Relay drive signal output for the power on/off control    “H”: relay on

24

SIGNAL

I

FM and AM signal meter voltage detection signal input from the FM/AM tuner pack

25

A/D-4

I

Key input terminal (A/D input)    S210 (NAME) key input
(Used for the AEP and UK models only)

26

A/D-3

I

Key input terminal (A/D input)    S231 to S239 (BASS BOOST, MUTING, SHIFT, 0, MEMORY 
or MEMORY/ENTER, CD, MD/TAPE, TV/SAT or TV/LD, RDS PTY) keys input
(S239 RDS PTY key: used for the AEP and UK models only)

27

A/D-2

I

Key input terminal (A/D input)    S221 to S230 (FM or FM/AM, 6, 5, 4, 7, 8, 9, FM MODE, 
VIDEO, TUNER) keys input

28

A/D-1

I

Key input terminal (A/D input)    S211 to S220 (DISPLAY, AM or RDS EON, 3, 2, 1, TUNING 
or TUNING/CHAR –/+, PRESET TUNING or PRESET/PTY SELECT –/+, DIRECT) keys input 
(S211 DISPLAY key: used for the AEP and UK models only)

29

AVDD

—

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

30

AVREF

I

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

31

RDS DATA IN

I

RDS data input from the RDS decoder (IC1) (Used for the AEP and UK models only)

32

OPEN

—

Not used (open)

33

GND

—

Ground terminal

34

X1

I

Main system clock input terminal (4.19 MHz)

35

X2

O

Main system clock output terminal (4.19 MHz)

36

WOFER RLY

O

Relay drive signal output for the woofer speaker    “H”: relay on    Not used (open)

37

LED SELECT

O

LED select signal output terminal    “H” active    Not used (open)

38

DOLBY LED

O

LED drive signal output terminal    “H”: LED on    Not used (open)

39

C STUDIO LED

O

LED drive signal output terminal    “H”: LED on    Not used (open)

40

HALL LED

O

LED drive signal output terminal    “H”: LED on    Not used (open)

41

ENTER LED

I

Not used (fixed at “L”)

42

VOL DOWN

O

Motor drive signal (volume down direction) output to the volume motor drive (IC202)
“H” active

43

VOL UP

O

Motor drive signal (volume up direction) output to the volume motor drive (IC202)
“H” active

– 27 –

Pin No.

Pin Name

I/O

Description

44

SYS-POWER

I

Power on/off switch (S240 I/

u) input terminal    “L” is input when key pressing

45

TUNER MUTE

O

Muting control signal output to the FM/AM tuner pack    “H”: muting on

46

RDS CLK IN

I

RDS serial clock signal input from the RDS decoder (IC1)
(Used for the AEP and UK models only)

47

STOP

I

Power down detection signal input from the reset signal generator (IC950)
“L”: power down, normally: “H”

48

VSS

—

Ground terminal

49

SIRCS

I

Sircs remote control signal input from the remote control receiver (IC203)

50

MUTING LED

O

LED drive signal output of the MUTING indicator (D211)    “L”: LED on

51

5.1 LED

O

LED drive signal output terminal    “L”: LED on    Not used (open)

52

VDD

—

Power supply terminal (+5V)

53

LOW BOOST

O

Control signal output of the BASS BOOST circuit and LED drive signal output of the BASS 
BOOST indicator (D212)    “H”: BASS BOOST on (LED on)

54

FUNC. MUTE

O

Audio line muting on/off control signal output terminal    “H”: muting on

55

IC. MUTE

O

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

56

VERSION

I

Setting terminal for the version

57, 58

S2, S1

O

Not used (open)

59 to 61

LED1 to LED3

O

LED drive signal output terminal    “H”: LED on    Not used (open)

62 to 70

S15 to S7

O

Segment drive signal output to the fluorescent indicator tube (FL201)

71

VLOAD

—

Negative power supply terminal for the fluorescent indicator tube drive (–24V)

72 to 77

S6 to S1

O

Segment drive signal output to the fluorescent indicator tube (FL201)

78 to 80

DIG10 to DIG8

O

Digit drive signal output to the fluorescent indicator tube (FL201)

– 28 –

The components identified by
mark 

! or dotted line with mark

! are critical for safety.

Replace only with part number
specified.

• 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

X-4947-207-1 FOOT ASSY (F50150S) (AEP, UK)

1

X-4947-208-1 FOOT ASSY (F50150S) (US)

2

3-710-901-11 SCREW, TAPPING

* 3

4-998-206-21 CASE (413226)

#1

#1

#1

#1

Front panel 
section

not supplied

not 
supplied

not supplied

not 
supplied

Chassis section