Sharp Aquos LC-32AX3X, Руководство по обслуживанию

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LC-32AX3H/M/X
LC-37AX3H/M/X
26
TROUBLE SHOOTING TABLE
(Continued)
No audio hear
d (1)
No sound in the UHF/VHF reception.
No e
xter
nal audio heard
Is the IF output from the tuner (TU1100) as specified?
Chec
k
TU1100 and its per
ipher
al circuits
.
NO
YES
Is the SIF signal input at pins (23) and (24) of IC1104 (IF PLL) as specified?
Chec
k Q1101, Q1104, SF1101 and their per
ipher
al
circuits
.
NO
YES
Is the audio signal from pin (12) of IC1104 to pin (67) of IC2501 (MUL
TI ST
AND
ARD SOUND PR
OCESSOR) as specified?
Chec
k IC1104, IC2501 and their per
ipher
al circuits
.
(Q2500)
NO
YES
YES
YES
Is there the L-ch audio signal output at pin (28) of IC2501? Is there the R-ch audio signal output at pin (27) of IC2501?
Chec
k IC2501 and its per
ipher
al circuits
.
*A:
Bac
k from "No audio heard (3)"
NO
YES
<INPUT 1> Is there the L-ch audio signal input from pin (5) of input ter
minal J1201 to pin
(56) of IC2501? Is there the R-ch audio signal input from pin (3) of input ter
minal J1201 to pin
(57) of IC2501? <INPUT 2> Is there the L-ch audio signal input from pin (5) of input ter
minal J1202 to pin
(53) of IC2501? Is there the R-ch audio signal input from pin (3) of input ter
minal J1202 to pin
(54) of IC2501? <INPUT 3> Is there the L-ch audio signal input from pin (5) of input ter
minal J1203 to pin
(50) of IC2501? Is there the R-ch audio signal input from pin (2) of input ter
minal J1203 to pin
(51) of IC2501?
Is there the L-ch audio signal output at pin (7) of IC2504 (AMP)? Is there the R-ch audio signal output at pin (1) of IC2504 (AMP)?
Chec
k IC2504 and its per
ipher
al circuits
.
NO NO
YES
Is there the L-ch audio signal input at pin (11) of IC2701 (A
udio Output IC)?
Is there the R-ch audio signal input at pin (15) of IC2701 (A
udio Output IC)?
Chec
k IC2701, m
ute circuit and their per
ipher
al
circuits
. (Q2700 thr
u Q2702)
YES
Is there the L-ch audio signal output betw
een pins (31) and (28) of IC2701 (A
udio Output IC)?
Is there the R-ch audio signal output betw
een pins (27) and (24) of IC2701 (A
udio Output IC)?
NO
Chec
k IC2701 and the audio m
ute logic circuit.
(Q2705, Q2706, D2501 thr
u D2503, D2700,
D2706)
YES
Chec
k the rela
y circuit (R
Y2700) and its per
ipher
al circuits
.
Chec
k the speak
ers and their per
ipher
al circuits
.
YES
No audio hear
d (2)
No audio signal at the monitor audio output ter
minal.
No sound heard from the headphone
.
Is there the L-ch audio signal output at pin (34) of IC2501? Is there the R-ch audio signal output at pin (33) of IC2501?
Chec
k IC2501 and its per
ipher
al circuits
.
NO
YES
Is the L-ch audio signal outputted to Q1215? Is the R-ch audio signal outputted to Q1216?
Chec
k Q1215, Q1216 and their per
ipher
al circuits
.
NO
YES
NO
Does the audio m
ute circuit function? (Q1206 and Q1207)
Chec
k Q1206, Q1207, Q1219, Q1220, pin (72) of
IC1203 and their per
ipher
al circuits
.
YES
Chec
k the monitor audio output ter
minal (J1203) and its per
ipher
al
circuits
.
Is there the audio signal output at pins (25) (L-ch) and (24) (R-ch) of IC2501?
NO
YES
Is the m
ute signal input at pin (2) of IC2506 as
specified?
NO
Chec
k Q3905, Q2705, Q2706 (MUTE CIRCUIT) and
their per
ipher
al circuits
.
Chec
k J2500 and it per
ipher
al circuits
, as w
ell as the headphone jac
k line
.
Is there the L-ch audio signal output at pin (1) of IC2506 (H/P AMP)? Is there the R-ch audio signal output at pin (7) of IC2506 (H/P AMP)?