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No sound from HEAD PHONE_OUTPUT/ AUDIO_OUTPUT terminal.
Does not the sound of the audio signal output to Headphone mode go
out?
Check whether it is selected "Headphone" by Headphone/Audio out
select under Menu-Setup-Option-Terminal setting-Headphone/Audio
out select.
Do audio signals output from pins [ 2/MONI_HP_R , 3/MONI_HP_L ] of J504(HP Jack/AUDIO OUT)?
Is HP_PLUG [1pin] of J504 at "H" ?
NO
Is HPOUT_MUTE at "H" ?
Is HP_MUTE [B27] of IC3301 at "H"?
Is AUDIO_MUTE(MUTE_A_ALL) [pin 23] of IC2004(UCOM) at "H"?
NO
Do audio signals output from pins [ 10/MONI_HP_R, 12/MONI_HP_L ]
of IC1702(HP-AMP) ?
NO
Do audio signals input to pins [14,15] of IC1702 ?
NO
Do audio signals (HP_MONITOR_L/R) output from pins
[AN34/CPU_ALO_ADAC,AN35CPU_ARO_ADAC ] of IC3301 ?
NO
Check IC3301 and its peripheral circuits.
No sound from DIGITAL AUDIO OUTPUT terminal.
Does audio signal output from pin[1] of sound output terminal (D527)
?
NO
D
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[ n
NO
Is AUDIO_MUTE(MUTE_A_ALL) [pin23] of IC2004(UCOM) at "H"?
NO
D
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] 2
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NO
Does audio signal (OPT_OUT) output from pin[AR16/CPU_ASDDIFO] of
IC3301(Digital AV decode & Main CPU) ?
NO
Check IC3301 and its peripheral circuits.
No sound from external output device (5)
No sound from external output device (6)
] 4
f o
C I
5
0
3
?
C I
5
0
3
?
6 – 9
Does not the sound of the audio signal output to Audio out mode go
out?
Check whether it is selected "Audio out" by Headphone/Audio out
select under Menu-Setup-Option-Terminal setting-Headphone/
Audio out select.
YES
Check the setting of an external input device that connects with
J504.
And check the line between J504 and IC3301(Digital AV decode &
Main CPU)
YES
Check the line between J504 and HPOUT_MUTE.
(Q506,Q510,IC3301 & IC2004 etc...)
YES
Check the line between IC1702 and J504.
YES
Check IC1702 and its peripheral circuits.
YES
Check the line between IC3301 and IC1702.
YES
Check D527 and peripheral circuits.
Y
E
S
C
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C I
5
YES
Check the peripheral circuits of IC503 and AUDIO_MUTE
(Q505 etc...)
Y
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S
C
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k
C I
5
0
3
a
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l a
YES
Check the line between IC3301 and IC503.
LC-90Y8T
0
3
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D
5
2
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