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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 the 

EXT

-3.

Are audio signals sent to 

the pins (5)(2) of the 

headphone terminal 

(J402)?

Are audio input/output 

signals 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 line, 

and peripheral circuits.

Confirmation of the settings:

1) Is the MUTE button of REMOCON set to ON? … Set to OFF

.

2) Is MENU-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 pins (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 circuits.

Check IC1402 and its 

peripheral circuits.

Are audio signals sent to 

the pins (5)(8) of the EXT

-

3 external terminal J401?

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.

External audio input signals 
supplied from EXT4 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?

Check IC1401 and 
its peripheral 
circuits.

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

<EXT4>
Are audio signals supplied 
from J1901 to the pins (4)(11) 
of IC1401?

Check COMPONENT 
UNIT (J1901) and its 
peripheral circuits.

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

Check IC1351 and its 
peripheral circuits.

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

Check IC1301 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.

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 HEADPHONE (J402)? 

… Disconnect.

3) Is FM-ANT

-CABLE disconnected or is there a connection error? 

… Connect according to the operation manual.

4) Is "VOLUME" in MENU-SOUND-LEVELS-SPEAKERS-VOLUME set to "MIN=0"? 

… Set to the desired value between "0-100".

Are audio signals (SP

 L/R) sent from 

the pins (123)(124) of IC1001 (VCTI)?

Are audio output signals of the pins 

(1)(7) of IC1351 (H-PHONE-AMP) 

normal?

Are audio input signals of the pins 

(1

1)(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 or its peripheral 

circuits.

Check HEADPHONE-JACK 

(J402) or its peripheral circuits.

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 pins (126), (106) and 

(105) of IC1001 respectively

. Or check its 

peripheral circuits.

Is FM-IF signal sent from the pin (10) 

of TUNER 

(TU1201)?

Check if power of 33V/5V is supplied 

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)?

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