Sharp TU-GD10U-T Service Manual page 40

TU-GD10U-T
TU-45GAD/T
LC-45GX6U/D/T
TROUBLE SHOOTING TABLE
No sound comes out at BS reception.
Does the volume icon select
"speaker" when operating the volume
key?
Is the input signal to pin (3) of
IC3805/3812 normal?
Check the "HP-PLUG" signal Line.
Check Pin (4) of Headphone (J2402)
thru Pin (7) of IC1102.
Is input signal between pin (3)
(MAINL/R) of IC3805/3812 and pins
(56) and (57) of IC2501
(MULTISOUNDPROCESSOR)
normal?
Is audio output between pins (33) and
(34) (SC2_OUT_L/R) of IC2501
(MULTISOUNDPROCESSOR) and
pins (32) and (33) of IC2702 normal?
Is each audio output from pins (28)
and (29) of IC2702 normal?
(AOUT_L/R)
Is audio output between pins (28) and
(29) of IC2702 and pins (13) and (15)
of P3801 (1-bit amplifier input)
normal?
Is the relay normally switched from
P6003 of AUDIOIF PWB to RY6001
(speaker switching) or RY6000
(speaker A/B switching)?
No sound comes out. (2)
If the monitor output in the main menu
is set to "Variable", change to "Fixed".
Check between pins (9) and (7) (L/R
OUT) of P1105 and pins (3) of
IC3805/3812.
Is each signal (I2S/LRCK, BICK,
SDTO and SDTI) input/output from
IC2702 to IC2700 (DSP)?
Check between pins (33) and (34)
(SC2_OUT_L/R) of IC2501
(MULTISOUNDPROCESSOR) and
pin (32) and (33) of IC2702.
Check IC2702 and its peripheral
circuits.
Check the circuits between pins (28)
and (29) of IC2702 and pins (13) and
(15) of P3801 (1-bit amplifier input).
Check1-Bit Amp. and its peripheral
circuits.
40
(Continued)
No sound comes out at UHF/VHF
reception.
Does the volume icon select
"speaker" when operating the volume
key?
Is input signal to pin (67) (SOUND
IF1) of IC2501
(MULTISOUNDPROCESSOR)
normal?
Is SIF output from the tuner normal?
(Pin (14) of TU1101)
Check TU1101 (UV tuner) and its
peripheral circuits.