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No audio 

output from the 

headphones.

No audio output 

from the 

SCAR

T1. 

(EXT

-1)

No audio output 

from the 

SCAR

T2. 

(EXT

-2)

No audio output from t

he 

EXT

-3.

Are audio signals sent to 

the pi

ns (5)(2) of the 

headphone terminal 

(J402)?

Are audio input/output 

sig

nals of the pins 

(1)(7)/(3)(5) of IC1351 

(HP-AMP) normal?

Are audio output signals 

(SPL/R) sent to the pins 

(123)(124) of IC1001 

(VCTI) normally?

Check the audio input 

signals of IC1001 (VCTI), 

power supply line, I2C li

ne, 

and peripheral c

ircuits.

Confirmation of the se

ttings:

1) Is the MUTE

 button of REMOCON set to ON? … Set to OFF

.

2) Is M

ENU-SOUND-LEVELS-EXTERNAL-SCAR

T/A

V

 VOL

 set to "0=MIN"

? … Set the desired volume between "0-100".

3) Check the connection 

with external equipment. … Is there a connection error?

Are audio signals sent 

to 

the pins (1)(3) 

of SCAR

T

-1 

(SC1451)?

Are audio signals sent to 

the pi

ns (122)(121) of 

IC1001?

Are 

audio signals sent to 

the pins (1)(3) of 

SCAR

T

-2 

(SC1452)?

Are audio signals sent to 

the pins (1)(

7) of IC1402?

Are audio L/R signals sent 

to the pins (120)(129) of 

IC1001?

Check the 2S-MUTE 

and SS-MUTES 

signals and peripheral 

circuits.

Check IC1001 and its 

peripheral circuits.

Check IC1001 and its 

peripheral circui

ts.

Check I

C1402 and its 

peripheral circuits.

Are audio signals sent to 

the pins (5)(8) of the

 EXT

-

3 external terminal J401?

                   YES

External audio input signals 
supplied from SCART1 and EXT3 
are not heard.

External audio input signals 
supplied from SCART2 and PC 
INPUT are not heard.

<SCART1>
Is LI1 audio signal supplied from 
the pin (6) of the input terminal 
SC1451 to the pin (114) of 
IC1001?
Is RI1 audio signal supplied from 
the pin (2) of the input terminal 
SC1451 to the pin (113) of 
IC1001?
<EXT3>
Is LI2 audio signal supplied from 
the J401 terminal to the pin (116) 
of IC1001?
Is RI2 audio signal supplied from 
the J401 terminal to the pin (115) 
of IC1001?

<SCART2>
Is L audio signal supplied from 
the pin (6) of the input terminal 
SC1452 to the pin (15) of 
IC1401?
Is R audio signal supplied from 
the pin (2) of the input terminal 
SC1452 to the pin (2) of IC1401?
<PC-INPUT>
Is L audio signal supplied from 
the PC-AUDIO CONNECTOR 
(J402)  to the pin (12) of 
IC1401?
Is R audio signal supplied from 
the J402 CONNECTOR to the 
pin (1) of IC1401?

Are audio signals sent to the pins 
(3)(13) of IC1401?

Are LI3 and RI3 audio signals 
supplied to the pins (118) and 
(117) of IC1001 respectively?

Check IC1401 and its 
peripheral circuits.

Are audio signals sent to the pins 
(1)(7) of IC1351 normally?

Are audio input signals of the 
pins (11) (15) of IC1301(AUDIO-
AMP-IC)  normal?

Are audio output signals of the 
pins (28)(31)/(24) (27) of 
IC1301(AUDIO-AMP-IC) normal?

Check the connector (P1301) 
and  the left and right SP-boxes.

Check IC1351 and its 
peripheral circuits.

Check HEADPHONE-
JACK (J402) or its 
peripheral circuits.

Check IC1301 and its 
peripheral circuits.

No external input sound Ex 4 comes out

No external analogue input sound Ex 5 comes out

No external digital input sound Ex 5 comes

 out

Is the inputted signal from J1901 to

Check IC1906 and

Is the inputted signal from J1902 to

Check IC1906 and

Is the output digital signal pins 84, 85 and 

Check IC1904 and

input terminals 1 and 3 of  P2103 ?

peripheral components

input terminals 1 and 3 of  P2103 ?

peripheral components

86 of IC1904 as

 specified?

peripheral components

                                         YES

Is the output analogue signal pins 10 and 

Check IC1905 and

11 of IC1905 as specified?

peripheral components

Is the output analogue signal of

Check IC1906 and

pins 1 and 3 of  P2103 ?

peripheral components

Is the output signal pin 9 and 7 of 

Check Components

P2101 as specified?

units and peripheral.

Are audio signals sent to the pins 

Check IC1351 and its

(1) (7) of IC1351 normally?

 peripheral circuits.

Are audio input signals of the pins

Check HEADPHONE-

 (11) (15) of IC1301(AUDIO-AMP-IC)

JACK (J402) or its

 normal?

peripheral circuits.

Are audio output signals of the 

Check IC1301 and its

pins (28)(31)/(24) (27) of IC1301

peripheral circuits.

(AUDIO-AMP-IC) normal?

Check the connector (P1301) and

the left and right SP-boxes.

No FM sound.

Confirmation of the settings:

1) Is the MUTE button of REMOCON set to ON

? … Set to OFF

.

2) Are 

headphones connected to HEA

DPHONE (J402)? 

… Disconnect.

3) Is FM-ANT

-CABLE disconnec

ted or is there a connection error? 

… Connect acc

ording to the operation manual.

4) Is "VOLUME" in MENU-SOUND-LEVELS-SPEAKE

RS-VOLUME set to

 "MIN=0"? 

… Set to the de

sired value between "0-100"

.

Are audio 

signals (SP L/R) sent from 

the pins

 (123)(124) of IC1001 

(VCTI)?

Are audio output sign

als of the pins 

(1)(7) of IC1351 (H-P

HONE-AMP) 

normal?

Are aud

io input signals of th

e pins 

(1

1)(15) of IC1301 (AUDIO-AMP-IC

) 

normal?

Are audio output signals of the pins 

(28)(31)/(24)(27) of IC

1301 (AUDIO-

AMP-IC) normal?

Check the connect

or (P1301) and the 

left and right SP-boxes.

Check 

IC1351 or its peripheral 

circuits.

Check HEADPHONE-J

ACK 

(J402) or its peripheral circui

ts.

Check IC1301 and its peripheral 

circuits.

Check 

SF1201 and its peripheral 

circuits.

Are IF signals 

(IF+/IF-) supplied to the 

pins (109)(

1

10) of IC1001 (VCTI)?

Check if +8V

, +5V and +3.3V are

 

supplied to the pin

s (126), (106) and 

(105) of IC1001 respect

ively

. Or check it

s 

peripheral circuits.

Is FM-IF signal sent

 from the pin (10) 

of TUNER 

(T

U1201)?

Check

 if power of 33V/5V is s

upplied 

to the pins (9)/(7) of 

TUNER

(TU1201). Or check its peripheral 

parts.

Is FM-IF signal sent from 

the pin (4) of 

IC1201 (MIXER