Sharp LC-37D64U Service Manual page 50

LC-32/37D64U
INPUT-1 No audio
Is INPUT-1 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
YES
Does the audio signal come from pins(5)(L) and (7)(R) of input
terminal(J501) to pins(8)(L) and (13)(R) of IC501(AV_SW) on the
TERMINAL unit?
Check the line between J501 and IC501.
YES
Does the audio signal come from pins(20)(L) and (18)(R) of IC501 to pins(69)(L) and (71)(R) of connector(SC501)?
Are there the audio signal inputs at pins(69)(L) and (71)(R) of connec-
tor(SC2203) on the MAIN unit?
Does the audio signal come from pins(69)(L) and (71)(R) of SC2203 to
pins(35)(L) and (36)(R) of IC1403(CODEC)?
Does the audio signal come from pins(4)(COD_LRCK), (5)(COD_BCK) and
(6)(COD_SDOUT) of IC1403 to pins(AK24), (AH24) and (AJ24) of
IC8001(CPU)?
Does the audio signal come from pins(AJ25)(DSP_LRCK),
(AK25)(DSP_BCKIN), (AL25)(DSP_SDIN1) and (L32)(DSP_SDIN2) of IC8001
to pins(2), (3), (6) and (4) of IC1402(SOUND_DSP)?
Does the audio signal come from pins(19)(DSP_SDOUT1) and
(21)(DSP_SDOUT3) of IC1402 to pins(11) and (12) of IC1403(CODEC)?
Does the audio signal come from pins(AJ25)(DSP_LRCK),
(AK25)(DSP_BCKIN) and (AL24)(DSP_MCLK) of IC8001 to pins(8), (9) and
(10) of IC1403?
Does the audio signal come from pins(17)(SPOUT_LP) and (18)(SPOUT_RP)
of IC1403 to pins(39)(SP_LP) and (43)(SP_RP) of connector(SC2203) on the
MAIN unit?
Are there the audio signal inputs at pins(39)(SP_LP) and (43)(SP_RP) of con-
nector(SC501) on the TERMINAL unit?
Does the audio signal come from pins(39)(SP_LP) and (43)(SP_RP) of SC501
to pins(5)(SP_LP) and (9)(SP_RP) of IC2701(AMP) on the TERMINAL unit?
Is the audio output from IC2701 as specified?
Check the connector(P2701), speakers and their peripheral circuits.
No audio (1)
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
6 – 7
INPUT-2 No audio
Is INPUT-2 selected on the input select menu screen?
Is the audio output selected for "VARIABLE" on the
menu screen?
Set the audio output to "FIXED".
YES
Does the audio signal come from pins(5)(L) and (7)(R) of input
terminal(J503) to pins(7)(L) and (12)(R) of IC501(AV_SW) on
the TERMINAL unit?
Check the line between J503 and IC501.
YES
Check the line between IC501 and SC501 its peripheral circuits.
NO Check the line between SC501 and SC2203.
NO Check the line between IC1403 and SC2203.
Check the line between IC1403 and IC8001.
NO
Check the line between IC8001 and IC1402.
NO
NO Check the line between IC1402 and IC1403.
Check the line between IC8001 and IC1403.
NO
Check the line between SC2203 and
NO
IC1403.(D1305, D1312, Q1306 and Q1307, etc.)
NO Check the line between SC501 and SC2203.
NO Check the line between SC501 and IC2701, and
their peripheral circuits.(AMP_MUTE line, etc.)
NO Check IC2701 and its peripheral circuits.
NO
NO
NO