Sharp LC-12A2E (serv.man2) Service Manual ▷ View online
9
LC-12A2E
[4] Initialization
4-1. Connect the 81 pin and 82 pin of IC2001 (microcomputer) to GND, and turn on the power.
4-2. Select the model name (A2E/A2E(K)).
4-3. Select the inch size (12).
4-4. Return the 81 pin and 82 pin of IC2001 (microcomputer) to the original state.
4-2. Select the model name (A2E/A2E(K)).
4-3. Select the inch size (12).
4-4. Return the 81 pin and 82 pin of IC2001 (microcomputer) to the original state.
[5] Transmission data by model
Transmission data
[6] Adjustment
6-1. +B adjustment
1) Receive the E-12CH (PAL color bar).
2) Adjust the voltage of the 49 pin of SC401 to 5.00V
2) Adjust the voltage of the 49 pin of SC401 to 5.00V
±
0.02V.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
6-2. 38.9-VCO adjustment
1) Set the sound system to the B/G mode.
2) Send the CW signal of 38.9MHz, 90dB
2) Send the CW signal of 38.9MHz, 90dB
µ
V from SG to TP3201 (IF-OUT).
3) Adjust the L3231 coil so that a voltage of 2.5
±
0.2V is obtained at TP3203 (AFT).
Note 1: The input impedance of the digital voltmeter must be 1M
Ω
or more.
Note 2: To adjust L3231, use a non-magnetic driver.
Note 3: No signal must not be input from the antenna.
Note 3: No signal must not be input from the antenna.
6-3. 33.9-L’-VCO adjustment
1) Set the sound system to the L’ mode.
2) Send the CW signal of 33.9MHz, 90dB
2) Send the CW signal of 33.9MHz, 90dB
µ
V from SG to TP3201 (IF-OUT).
3) Adjust the R3233 volume so that a voltage of 2.5
±
0.2V is obtained at TP3203 (AFT).
Note 1: The input impedance of the digital voltmeter must be 1M
Ω
or more.
Note 2: After performing the adjustment of the item 6-2, execute this item.
Note 3: No signal must not be input from the antenna.
Note 3: No signal must not be input from the antenna.
6-4. RF-AGC cut-in adjustment
1) Set the sound system to the B/G mode, and receive the E-12CH (PAL color bar).
2) Set the antenna input level to 56dB
2) Set the antenna input level to 56dB
µ
V (75
Ω
termination, QP value).
3) Turn the R3231 (AGC volume) clockwise so that the voltage of the TP3202 (RF-AGC terminal) becomes
maximal.
4) Turn it counterclockwise, and adjust the AGC terminal voltage to the point that is lower than the maximal
voltage by 0.5
±
0.2V.
6-5. Opposed bias adjustment
1) Receive the monoscope pattern.
2) Adjust the "COM BIAS" so that the contrast of the stairway-shaped part may become the biggest.
2) Adjust the "COM BIAS" so that the contrast of the stairway-shaped part may become the biggest.
Model
E2PROM adress
Item
Write Data
OSD Display
LC-12A2E
10
6-6. TAMP adjustment
1) Receive the E-12CH (PAL color bar).
2) If the reading of “Y” on the page 2 of the adjustment processing is not located between B0 and BA, perform
2) If the reading of “Y” on the page 2 of the adjustment processing is not located between B0 and BA, perform
the adjustment of “PAL TAMP” on the same page so that the reading of “Y” is located between B0 and BA.
3) If the adjustment of “PAL TAMP” is executed, write its adjustment value to the followings manually.
“NTSC TAMP”
“SECAM TAMP”
“PAL.M TAMP”
“PAL.N TAMP”
“NTSC TAMP”
“SECAM TAMP”
“PAL.M TAMP”
“PAL.N TAMP”
(Screen of the page 2 of the adjustment processing menu OSD)
0
1
2
3
4
5
6
7
8
9
10
11 12 13
14 15 16
17 18 19
20 21 22
23 24 25 26
2
C
O
M
B
I
A
S
1
1
7
N
T
S
C
T
A
M
P
2
7
P
A
L
T
A
M
P
2
7
S
E
C
A
M
T
A
M
P
2
7
P
A
L
-
M
T
A
M
P
2
7
P
A
L
-
N
T
A
M
P
2
7
T
V
H
-
P
E
A
K
I
N
G
3
R
C
U
T
O
F
F
+
3
G
C
U
T
O
F
F
0
B
C
U
T
O
F
F
-
9
G
3
B
3
R
3
0
0
0
0
0
0
G
1
B
4
Y
0
0
0
0
B
5
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
3)
Item
6-7. White balance adjustment
1) Receive the monoscope pattern.
2) Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the color of
2) Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the color of
the same level as the standard set.
Caution: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value
range of –10 ~ +10.
Caution: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value
range of –10 ~ +10.
11
LC-12A2E
TROUBLE SHOOTING TABLE
No picture
at all
Yes
No
Are inputs
and outputs
of IC802 as
specified?
Chec
k all the settings on the microprocessor’
s adjust process men
u.
No picture
Chec
k IC802
and its
per
ipher
al
par
ts
.
Yes
No
Are inputs
and outputs
of IC1201 as
specified?
Chec
k
IC1201 and
its per
ipher
al
par
ts
.
Chec
k LCD
panel v
oltage
and
wav
e
fo
rm
.
No TV
and
VIDEO 1
output
Yes
No
Are inputs
and outputs
of IC402 as
specified?
Chec
k IC402
and its
per
ipher
al
par
ts
.
No
Is input at Pin
(73) of IC802
as specified?
Chec
k IC802,
A
V1 line and
their
per
ipher
al
par
ts
.
No TV
output
Yes
No
Are v
oltages
at Pins (6),
(7) and (9) of
tuner as
specified?
Chec
k the
po
w
er line
.
Yes
No
Is output at
Pin (19) of
tuner as
specified?
Chec
k the
tuner and its
per
ipher
al
par
ts
.
No
Is input at Pin
(1) of IC402
as specified?
Chec
k the
line in
question.
Yes
Chec
k IC402
and its
per
ipher
al
par
ts
.
Yes
No
Are Pins (2)
and (4) of
IC402 at
“H”
and “L
”
respectiv
ely?
Are Pins (65)
and (66) of
IC2001 at
“H”
and “L
”
respectiv
ely?
No VIDEO
1 output
Yes
No
Is input at Pin
(1) of IC402
as specified?
Chec
k the
line in
question.
Yes
No
Are Pins (2)
and (4) of
IC402 both at
“L
”?
No
No VIDEO
2 output
No
Is input at Pin
(74) of IC802
as specified?
Chec
k J3409,
A
V2 line and
their
per
ipher
al
par
ts
.
No S
VIDEO
output
No
Are inputs at
Pins (71) and
(72) of IC802
as specified?
Chec
k
SC3301, SY
line
, SC line
and
per
ipher
al
par
ts
.
No
COMPONENT
output
No
Is input at
Pins (4), (5),
(6) and (75)
of IC802 as
specified?
Chec
k J3404,
J3405, J3406,
D
VD-Y line
,
CB line
, CR
line and
per
ipher
al
par
ts
.
Are Pins (65)
and (66) of
IC2001 both
at “L
”?
Chec
k IC402
and its
per
ipher
al
par
ts
.
Yes
Yes
Yes
Yes
Chec
k the
line in
question.
Are data
signal at pins
(31)~(57) of
IC802 as
specified?
Chec
k data
signals at
pins (13),
(14) of IC802.
No
Are input and
output of
IC1201 as
specified?
Yes
Chec
k the
wire breaks
and the shor
t
of circuits of
IC802.
IC1201 and
its per
ipher
al
par
ts
.
Chec
k the
wire breaks
and the shor
t
of circuits of
IC1201 and
its per
ipher
al
par
ts
.
Yes
Chec
k the
line in
question.
Yes
Are input and
output of
IC1201 as
specified?
No
Are data
signals at
pins (31)~(57)
of IC802 as
specified?
No
No
Chec
k data
signals at
pins (13), (14)
of IC802.
Yes
Chec
k the
wire breaks
and the shor
t
of circuits of
IC802,
IC1201 and
its per
ipher
al
par
ts
.
Chec
k the
wire breaks
and the shor
t
of circuits of
IC1201 and
its per
ipher
al
par
ts
.
1
Yes
2
1
Yes
Are input and
output of
IC1201 as
specified?
No
Are data
signals at
pins (31)~(57)
of IC802 as
specified?
Chec
k data
signals at
pins (13), (14)
of IC802.
Yes
Chec
k IC802,
IC1201 and
its per
ipher
al
par
ts
.
Chec
k the
wire breaks
and the shor
t
of circuits of
IC1201 and
its per
ipher
al
par
ts
.
2
LC-12A2E
12
TROUBLE SHOOTING TABLE
(Continued)
No picture and sound
No color
No TV
color
No S-VIDEO color
Yes
No
Do F3701 and F3702
function?
No
Yes
No
Chec
k all the settings on the microprocessor’
s adjust process men
u.
No
Are secondar
y outputs
(+38V
, +16V
, +9V
, +5V
, -8V)
of
T701 as specified?
Yes
Are the oscillation w
a
v
e
fo
rm
at
T701’
s pr
imar
y side as
specified?
Yes
No
Disconnect F3701 and
F3702.
Is the load side
shor
t-circuited?
Yes
No
Is an
y of
T701’
s pr
imar
y side
,
Q701, Q710 and S4701
shor
t-circuited?
Chec
k J3701, its per
ipher
al
par
ts and connection cab
le
.
Replace F3701 and F3702.
Chec
k S4701 and
connection cab
le
.
Chec
k the secondar
y-side
load of
T701.
Fluorescent lamp
Yes
No
Does F3751 function?
Yes
No
Is Pin (34) of IC1201 at
“H”?
Yes
Yes
No
Are the oscillation w
a
v
e
fo
rms
at the pr
imar
y side of
T751
and
T752 as specified?
Yes
Replace F3751.
No
Is input at Pin (71) of IC802
as specified?
Chec
k SC3301, SC line and
per
ipher
al par
ts
.
No
Are data signals at pins
(31)~(57) of IC802 as
specified?
Chec
k each DC pin v
oltages
of IC802 and its per
ipher
al
par
ts
.
Chec
k input and output
signals of IC1201.
Chec
k the line
, IC1201 and
its per
ipher
al par
ts
.
Chec
k Q751, Q752,
T751,
T752, Q753 and their
per
ipher
al par
ts
.
Replace the fluorescent lamp
and chec
k the oscillation
w
a
v
e
fo
rm
again.
No VIDEO
color
Chec
k all the settings on the microprocessor’
s adjust process men
u.
No COMPONENT color
No
Is input at Pins (4) and (6) of
IC802 as specified?
Chec
k J3404, J3405, CB line
,
CR line and per
ipher
al par
ts
.
Yes
Are data signals at
pins (31)~(57) of
IC802 as specified?
Chec
k input and
output signals of
IC1201.
No
Chec
k each DC
pin v
oltages of
IC802 and its
per
ipher
al par
ts
.
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