Sharp LC-46D92U Service Manual page 59

[Audio signal] INPUT-1 No audio
[INPUT-1 input]
Is INPUT-1 selected on the input select menu
screen?
Is the audio output selected for
"VARIABLE" on the menu
screen?
YES
Set the audio output to "FIXED".
[INPUT-1] Does the audio signal come from
pins (4) (L) and (2) (R) of input terminal
(J508) to pins (8) (L) and (6) (R) of connector
(SC502) on the TERMINAL unit?
Check the audio signal from
J508 to SC502, and their
peripheral circuits.
YES
[INPUT-1] Is there the audio signal input at
pins (8) (L) and (6) (R) of connector (SC1102)
on the MAIN unit?
Check the SC502 and SC1102
connectors
YES
[INPUT-1] Does the audio signal come from
pins (8) and (6) of SC1102 to pins (59)(L) and
(60)(R) of IC1404 (CODEC)?
Check the line between SC1102
and IC1404 and their periph-
eral circuits.
YES
Is there the audio signal output at pins (38)(L) and (39)(R) of IC1404?
YES
Is there the audio signal output at pins (11)(L) and (14)(R) of connec-
tor (SC1301) on the main unit?
YES
[Audio signal] INPUT-2 No audio
[INPUT-2 input]
Is INPUT-2 selected on the input select menu
screen?
NO
Is the audio output selected for
"VARIABLE" on the menu screen?
YES
YES
Set the audio output to "FIXED".
[INPUT-2] Does the audio signal come from pins
(4) (L) and (2) (R) of input terminal (J509) to pins
(12) (L) and (10) (R) of connector (SC502) on the
TERMINAL unit?
NO
Check the audio signal from J509 to
SC502, and their peripheral circuits.
YES
[INPUT-2] Is there the audio signal input at pins
(12) (L) and (10) (R) of connector (SC1102) on
the MAIN unit?
NO
Check the SC502 and SC1102 con-
nectors
YES
[INPUT-2] Does the audio signal come from pins
(12) and (10) of SC1102 to pins (53)(L) and
(54)(R) of IC1404 (CODEC)?
NO
Check the line between SC1102 and
IC1404 and their peripheral circuits.
YES
No audio (1)
NO
YES
NO
NO
NO
Check the line between IC1404 and SC1301.
NO
4 – 11
LC-46D92U/LC-52D92U
[Audio signal] INPUT-3 No audio
[INPUT-3 input]
Is INPUT-3 selected on the input select
menu screen?
Is the audio output selected for
"VARIABLE" on the menu
screen?
YES
Set the audio output to
"FIXED".
[INPUT-3] Does the audio signal come
from pins (4) (L) and (2) (R) of input termi-
nal (J505) to pins (4) (L) and (2) (R) of con-
nector (SC502) on the TERMINAL unit?
Check the audio signal from
J505 to SC502, and their
peripheral circuits.
YES
[INPUT-3] Is there the audio signal input at
pins (4) (L) and (2) (R) of connector
(SC1102) on the MAIN unit?
Check the SC502 and SC1102
connectors
YES
[INPUT-3] Does the audio signal come
from pins (4) and (2) of SC1102 to pins
(61)(L) and (62)(R) of IC1404 (CODEC)?
Check the line between
SC1102 and IC1404 and their
peripheral circuits.
YES
Check IC1404 and its
peripheral circuits.
NO
NO
YES
NO
NO
NO