LC-15PX1U
24
TROUBLE SHOOTING TABLE
(Continued)
No sound
No sound fr
om speaker
s
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
Chec
k the f
ollo
wing.
1
No audio output from
TV ...
Chec
k the
per
ipher
al circuits of Q3203, Q3204 and
TU3000.
2
No audio output from A
V1 input ...
Chec
k
J3402 thr
u pins (2) and (4) of IC3401.
3
No audio output from A
V2 input ...
Chec
k
J3404 thr
u pins (22) and (24) of IC3401.
4
No audio output from COMPONENT input
...
Chec
k J3406 thr
u
pins (46) and (48) of
IC3401.
Is there the audio output in an
y input mode (TV
, A
V1,
A
V2 and COMPONENT)?
Chec
k the f
ollo
wing.
1
Is the monitor output setting at "A
udio fix
ed"?
2
Is the sound v
olume loud enough?
3
Is the m
ute mode released?
4
Are the headphones unplugged?
Is the po
w
er supply v
oltage at each circuit nor
mal?
Pin (8) of IC3301 and pin (39) of IC3201
Appro
x.
+8V
Pins (11), (12), (13), (65) and (66) of IC3201
Appro
x.
+5V
No sound fr
om monitor output
Is there the audio signal output at pins
(36)(Rch) and (37)(Lch) of IC3201?
Is pin (55) of IC2001 "H"?
Is the signal from the Q3403 collector "L"?
Chec
k pins (33)(Rch) and (34)(Lch) of IC3201
thr
u pins (4)(Lch) and (2)(Rch) of J3404.
Chec
k the f
ollo
wing.
1
Is there the audio output from speak
ers?
2
Is the monitor output connected correctly?
3
Is the m
ute mode released?
No sound fr
om the
headphones
Chec
k
the line from J4201
to IC3305 and IC3201.
Chec
k the f
ollo
wing.
1
Go to "No A
udio from
Speak
ers".
2
Connect the monitor output
correctly
.
3
Release the m
ute mode
.
Chec
k
the per
ipher
al circuits of
IC3201.
Chec
k pin (4) of J4021 thr
u pin
(58) of IC2001.
Chec
k pin (55) of IC2001 thr
u
Q2203, and Q2201.
Is there the control signal input at each pin of IC3201?
Pin (2) of IC3201 SCL1
Pin (3) of IC3201 SD
A1
Are the oscillation w
a
ves from pins (71) and (72) of
IC3201 nor
mal?
Chec
k pins (29) and (30) of IC2001 thr
u pins
(2) and (3) of IC3201.
Chec
k the per
ipher
al circuits of X3201.
Is there the audio signal output at pins (27)(Rch) and
(28)(Lch) of IC3201?
Chec
k pins (27)(Rch) and (28)(Lch) of IC3201 thr
u
pins (7)(Rch) and (1)(Lch) of IC3304, and the
per
ipher
al circuits of IC3301.
Chec
k the per
ipher
al circuits of IC3201.
YES
YES
NO
NO
Is the v
oltage at pin (7) (po
w
er input ter
minal) of
IC3304 as specified (about +12V)?
Chec
k the A
C
adaptor as w
ell as the line from
A
C
adaptor to pin (7) of IC3304.
Is the v
oltage at pin (5) (standb
y control ter
minal) of
IC3304 as specified (about +2.8V)?
Chec
k the line from pin (56) of IC2001 to pin
(5) of IC3304.
Rechec
k the f
ollo
wing.
1
Set the monitor output to "A
udio fix
ed".
2
Increase the sound v
olume
.
3
Release the m
ute mode
.
4
Unplug the headphones
.
Chec
k the f
ollo
wing.
+8V system ...
Chec
k the per
ipher
al circuits of
Q3711 thr
u pin (8) of IC3301
and pin (39) of IC3201.
+5V system ...
Chec
k the IC702, Q713 output
5V (SUB)
line thr
u each +5V input pin of
IC3201.
Summary of Contents for LC-15PX1U
Page 27: ...LC 15PX1U 27 17 16 19 18 15 14 13 12 11 10 INVERTER Unit OPERATION Unit ANALOG Unit ...
Page 30: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 30 OVERALL WIRING DIAGRAM ...
Page 31: ...LC 15PX1U 31 17 16 19 18 15 14 13 12 11 10 ...
Page 33: ...33 6 5 4 3 2 1 A B C D E F G H LC 15PX1U SCHEMATIC DIAGRAM Ë OPERATION Unit ...
Page 34: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 34 ËMAIN Unit 1 14 ...
Page 35: ...LC 15PX1U 35 17 16 19 18 15 14 13 12 11 10 ...
Page 36: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 36 ËMAIN Unit 2 14 ...
Page 37: ...LC 15PX1U 37 17 16 19 18 15 14 13 12 11 10 ...
Page 38: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 38 ËMAIN Unit 3 14 ...
Page 39: ...LC 15PX1U 39 17 16 19 18 15 14 13 12 11 10 ...
Page 40: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 40 ËMAIN Unit 4 14 ...
Page 41: ...LC 15PX1U 41 17 16 19 18 15 14 13 12 11 10 ...
Page 42: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 42 ËMAIN Unit 5 14 ...
Page 43: ...LC 15PX1U 43 17 16 19 18 15 14 13 12 11 10 ...
Page 44: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 44 ËMAIN Unit 6 14 ...
Page 45: ...LC 15PX1U 45 17 16 19 18 15 14 13 12 11 10 ...
Page 46: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 46 ËMAIN Unit 7 14 ...
Page 47: ...LC 15PX1U 47 17 16 19 18 15 14 13 12 11 10 ...
Page 48: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 48 ËMAIN Unit 8 14 ...
Page 49: ...LC 15PX1U 49 17 16 19 18 15 14 13 12 11 10 ...
Page 50: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 50 ËMAIN Unit 9 14 ...
Page 51: ...LC 15PX1U 51 17 16 19 18 15 14 13 12 11 10 ...
Page 52: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 52 ËMAIN Unit 10 14 ...
Page 53: ...LC 15PX1U 53 17 16 19 18 15 14 13 12 11 10 ...
Page 54: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 54 ËMAIN Unit 11 14 ...
Page 55: ...LC 15PX1U 55 17 16 19 18 15 14 13 12 11 10 ...
Page 56: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 56 ËMAIN Unit 12 14 ...
Page 57: ...LC 15PX1U 57 17 16 19 18 15 14 13 12 11 10 ...
Page 58: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 58 ËMAIN Unit 13 14 ...
Page 59: ...LC 15PX1U 59 17 16 19 18 15 14 13 12 11 10 ...
Page 60: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 60 ËMAIN Unit 14 14 ...
Page 61: ...LC 15PX1U 61 17 16 19 18 15 14 13 12 11 10 ...
Page 62: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 62 ËANALOG Unit 1 4 ...
Page 63: ...LC 15PX1U 63 17 16 19 18 15 14 13 12 11 10 ...
Page 64: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 64 ËANALOG Unit 2 4 ...
Page 65: ...LC 15PX1U 65 17 16 19 18 15 14 13 12 11 10 ...
Page 66: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 66 ËANALOG Unit 3 4 ...
Page 67: ...LC 15PX1U 67 17 16 19 18 15 14 13 12 11 10 ...
Page 68: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 68 ËANALOG Unit 4 4 ...
Page 69: ...LC 15PX1U 69 17 16 19 18 15 14 13 12 11 10 ...
Page 70: ...70 6 5 4 3 2 1 A B C D E F G H LC 15PX1U ËR C LED Unit ...
Page 71: ...71 6 5 4 3 2 1 A B C D E F G H LC 15PX1U ËCARD LED Unit ...
Page 72: ...72 6 5 4 3 2 1 A B C D E F G H LC 15PX1U ËCARD DETECT Unit ...
Page 73: ...73 6 5 4 3 2 1 A B C D E F G H LC 15PX1U ËINVERTER Unit ...
Page 78: ...LC 15PX1U 8 7 10 9 6 5 4 3 2 1 A B C D E F G H 78 ANALOG Unit Side A ...
Page 79: ...LC 15PX1U 79 17 16 19 18 15 14 13 12 11 10 ...
Page 82: ...82 6 5 4 3 2 1 A B C D E F G H LC 15PX1U INVERTER Unit Side A ...