Read Sharp LC-20B2EA (serv.man5) Service Manual online
16
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No sound
(1/2)
No sound from front speakers
No sound from headphone
No sound from
output line
Check all the settings microprocessor's adjust process menu.
Is the pin 53 of IC2001
Muting effect is on.
Is the pin 52 of IC2001
Muting effect is on.
Is output at pins 33
Check IC1901 and
its
in the "L" state?
No
Check the FSMUTE
in the "L" state?
No
Check the HP_MUTE
and 34 of IC1901
No
peripheral parts.
Yes
Yes
Yes
Yes
l
ine.
line.
normal?
Ye
s
Is output at pins 27 and
Check IC1901 and its
Is output at pin
s 24 and
Check IC1901 and its
Is output at pins 1 and
Check IC3500 and its
28 of IC1901 normal?
No
peripheral parts.
25 of IC1901 normal?
No
peripheral parts.
7 of IC3500 normal?
No
peripheral parts.
Yes
Yes
Is output at pins 1 and
Check IC1903 and its
Is output at pins
1 and
Check IC304 and its
7 of IC1903 normal?
No
peripheral parts.
7 of IC304 normal?
No
peripheral parts.
Ye
s
Is output at pins 8 and
Check IC3305 and its
Check headphone jack
12 of IC3305 normal?
No
peripheral parts.
and connection cable.
Check front speakers
and connection cable.
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