Sharp LC-32D62U Service Manual page 38

LC-32D62U/LC-37D62U 1st
[Audio signal] INPUT-1 No audio
[INPUT-1 input]
Is INPUT-1 selected on the input select menu
screen?
NO
Is the audio output selected for
"VARIABLE" on the menu
screen?
YES
Set the audio output to "FIXED".
YES
[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?
NO
Check the audio signal from J508
to SC502, and their peripheral cir-
cuits.
YES
[INPUT-1] Is there the audio signal input at
pins (8) (L) and (6) (R) of connector (SC1102)
on the MAIN unit?
NO
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)?
NO
Check the line between SC1102
and IC1404 and their peripheral
circuits.
YES
Is there the audio signal output at pins (38) (L) and (39) (R) of IC1404?
Is there the audio signal output at pins (11) (L) and (14) (R) of connector (SC1301) on the MAIN unit?
Is there the audio signal input at pins (11) (L) and (14) (R) of connector (P2704) on the TERMINAL
unit?
No audio (1)
[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
Set the audio output to "FIXED".
YES
[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 cir-
cuits.
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
connectors.
YES
[INPUT-2] Does the audio signal come from
pins (12) (L) and (10) (R) 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
YES
YES
6 – 6
[Audio signal] INPUT-3 No audio
[INPUT-3 input]
Is INPUT-3 selected on the input select
menu screen?
NO
Is the audio output selected
for "VARIABLE" on the menu
screen?
YES
Set the audio output to
YES
"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?
NO
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?
NO
Check the SC502 and
SC1102 connectors.
YES
[INPUT-3] Does the audio signal come
from pins (4) (L) and (2) (R) of SC1102 to
pins (61) (L) and (62) (R) of IC1404
(CODEC)?
NO
Check the line between
SC1102 and IC1404 and their
peripheral circuits.
YES
NO
Check IC1404 and its periph-
eral circuits.
NO Check the line between
IC1404 and SC1301.
NO Check the SC1301 and
P2704 connectors.