Read Sharp LC-26GA3 (serv.man8) Service Manual online
35
LC-26GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
No sound comes out.
(1)
No sound comes out at UHF/VHF reception.
Is the SIF output from the tuner as
specified?(TU1
101_Pin7)
Are the audio outputs (A-OUT_L/R) from pins (28)
and (29) of IC2714 as specified?
Are the audio outputs from pins (28) and (29) of
IC2714 to pins (13) and (15) of P3801 (1-bit
amplifier input) as specified?
Is the signal from the 1-bit amplifier inputted to
each terminal of P3810?
Is relay normally switched from R
Y3801 (speaker
switching) of
A
V
PWB ?
Are the audio signals from pins (34) and (33)
(SC2_OUTL/R) of IC2701 to pins (32) and (33) of
IC2714 (DIR) as specified?
Is the input signal to pin (67) (ANA_IN1+) and pin
(69) (ANA_IN2) of IC2701
(MUL
TI_SOUND_PROCESSOR) as specified?
Check
TU1
101 (UV tuner) and its peripheral
circuits.
No external input sound comes out.
Are the audio signals inputted to pins (56) (L-ch) and (57) (R-ch) of IC2701?
Is the L-ch audio signal outputted to pin (52) of IC3801?
Is the R-ch audio signal outputted to pin (54) of IC3801?
<INPUT
-1>
Is the L-ch audio signal inputted from pin (6) of input terminal SC1
101 to pin (2) of IC3801?
Is the R-ch audio signal inputted from pin (2) of input terminal SC1
101 to pin (4) of IC3801?
<INPUT
-2>
Is the L-ch audio signal inputted from pin (6) of input terminal SC1
102 to pin (9) of IC3801?
Is the R-ch audio signal inputted from pin (2) of input terminal SC1
102 to pin (1
1) of IC3801?
<INPUT
-3>
Is the L-ch audio signal inputted from pin (2) of input terminal J1
101 to pin (16) of IC3801?
Is the R-ch audio signal inputted from pin (5) of input terminal J1
101 to pin (18) of IC3801?
<INPUT
-4>
Is the L-ch audio signal inputted from pin (2) of input terminal J1900 to pin (29) of IC3801?
Is the R-ch audio signal inputted from pin (3) of input terminal J1900 to pin (31) of IC3801?
Check the peripheral circuits of filter circuits
(Q1
121-2) (Q1
1
19-20).
Check IC2714 and its peripheral circuits.
Check the 1-bit amplifier and its peripheral circuits.
Check the lines from pins (28) and (29) of IC2714
to pins (13) and (15) of P3801 (1-bit amplifier
input).(IC3802, Q3805-6)
Are signals LRCK, BICK, SDT
O and SDT
O
inputted/outputted from IC2714 to IC2710 (DSP)
normally?
Check the lines from pins (34) and (33)
(SC2_OUTL/R) of IC2701 to pins (32) and (33) of
IC2714.
YES
YES
YES
NO
NO
No sound comes out from the headphones.
Check IC2714 and its peripheral circuits.
Check the mute control terminal pin (2) of
IC2702.H:
Active, L: Mute
Are audio output pins (26) and (27) of IC2714
(DIR) as specified?
Are audio output pins (1) and (7) of IC2702
(H/P_AMP) as specified?
Check J2402 (HEAD_PHON_JACK) and its
peripheral circuits.
NO
NO
NO
YES
YES
YES
YES
YES
No sound comes out.
(2)
No sound comes out.
(3)
Are audio output pins (37) and (36)
(SC1_OUT_L/R) of IC2701 (MUL
TI_SOUND_
PROCESSOR) as specified?
Are audio output pins (7) and (1) of IC2704
(EQ_AMP) as specified?
Is MUTE circuit normal? (Q1
1
16-7)
Check
AUDIO OUTPUT
terminal peripheral circuit.
No monitor audio output comes out.
Is the monitor audio output set to anything other
than "V
ariable"?
Are the headphones disconnected?
Check IC2701 and its peripheral circuits.
Check IC2704 and its peripheral circuits.
Check Q1
1
16-7 and M.MUTE line.
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