Sharp LC-32LE700E Service Manual page 54

LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
Is there a audio input signal in pins (3/TUNER_OUT_L) and (1/
TUNER_OUT_R) of EXT1 (SC503)?
Is there a audio input signal in pins (3/MONITOR_L) and (2/
MONITOR_R) of EXT2 (SC502)?
Is (AF11/SC1-MUTE) of IC3302
(Digital AV decode & Main CPU) at H?
Is (AG11/SC2-MUTE) of IC3302
(Digital AV decode & Main CPU) at H?
Is there a audio output signal in pins(N27/TUNER_OUT_L) and
(N28/TUNER_OUT_R) of IC3302 (Digital AV decode & Main
CPU)?
Is there a audio output signal in pins(M30/MONITOR_L) and
(M29/MONITOR_R) of IC3302 (Digital AV decode & Main CPU)?
Check IC3302 and its peripheral circuits.
Is audio signal (L/R) output to pins (2, 4) of AUDIO_OUTPUT ter-
minal(J506)?
Is MONITOR_MUTE signal [AF13/MONI_MUTE] of IC3302 or
MUTE_A_ALL signal [21pin of IC2002(UCOM)] at "H"?
Is audio signal (L/R) input to pins [M29/MONITOR_R] [M30/
MONITOR_L] of IC3302?
Check IC3302 and its peripheral circuits.
The audio signal is not output (1)
No audio signal output from EXT1/EXT2 terminal.
NO
NO
NO
The audio signal is not output (2)
No audio signal output from AUDIO_OUTPUT terminal.
NO
NO
NO
YES Check the setting of an external input device that connects with
EXT1.
YES Check the setting of an external input device that connects with
EXT2.
YES Check the peripheral circuits of IC3302 and SC1-MUTE.(Q502,
D529etc.)
YES Check the peripheral circuits of IC3302 and SC2-
MUTE.(Q501,D528etc.)
YES Check the line between IC3302 and SC503.
YES Check the line between IC3302 and SC502.
YES Check the connection to AUDIO_OUTPUT terminal and external
input devices.
YES Check the peripheral circuits of IC3302 and MUTE-
A_ALL_LINE.(D526, etc.)
YES Check the line between IC3302 and J506.
(Q507,508,Q509,D526)
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