Sharp LC-13B2U, Service Manual

Page: 19 / 46

19
LC-13B2U
TROUBLE SHOOTING TABLE
(Continued)
No sound fr
om
speaker
s
Yes
No
Is Pin (53) of IC2001 at
“L
”?
Chec
k all the settings on the microprocessor
’s adjust process men
u.
No sound
No
Are outputs at Pins (1) and (7) of IC3301 as specified?
Yes
No
Are inputs at Pins (2) and (4) as w
ell as
outputs at Pins (8) and (12), all of IC3305, as specified?
Muting eff
ect is
on.
Chec
k the
FSMUTE line
.
Chec
k IC3301,
IC3302, IC3303 and their per
ipher
al par
ts
.
Chec
k the line
in question, IC3301 and its per
ipher
al
par
ts
.
Yes
Chec
k the
speak
ers and
their per
ipher
al
par
ts
.
No sound fr
om
headphone
Yes
No
Is Pin (55) of IC2001 at
“L
”?
Chec
k the
headphone and its per
ipher
al
par
ts
.
Chec
k Q2050,
J3500 and their per
ipher
al
par
ts
.
No sound fr
om output
line
Yes
No
Is Pin (52) of IC2001 at
“L
”?
No
Are outputs at Pins (14) and (15) of IC3501 as specified?
Yes
Chec
k the line
in question.
Chec
k the
LMUTE line
.
Chec
k IC3501,
IC3304 and its per
ipher
al
par
ts
.
TV sound failure
Yes
No
Is output at Pins (15) and (16) of tuner as specified?
No
Is input at Pin (67) of IC3304 as specified?
Yes
Chec
k IC3304,
X3301 and their per
ipher
al
par
ts
.
Chec
k the
tuner and its per
ipher
al
par
ts
.
Chec
k Q3201,
Q3202 and their per
ipher
al
par
ts
.