Sony KV-21XE42C Service Manual ▷ View online
— 25 —
KV-21XE42C
6. Connect an oscilloscope to CN1752 Pin
4 or (R OUT) of
C Board and ground.
7. Select RDRV with and .
8. Adjust with and for: 1.70
7. Select RDRV with and .
8. Adjust with and for: 1.70
±
0.05 Vp-p.
9. Reset the item DCOL to "1" level.
10. Write the memory by pressing
then
.
11. Return the following back to normal after adjustment.
PICTURE . . . . . . . . . . .
MAX
COLOR . . . . . . . . . . .
CENTER
BRIGHT . . . . . . . . . . . CENTER
R ON . . . . . . . . . . . ON (1)
G ON . . . . . . . . . . . ON (1)
G ON . . . . . . . . . . . ON (1)
B ON . . . . . . . . . . .
ON (1)
DISPLAY POSITION ADJUSTMENT (DISP)
1. Input a color-bar signal.
2. Set to Service adjustment Mode.
3. Select DISP with and
.
4. Adjust with and
for adjustment of characters to center .
5. Write the memory by pressing
then
.
6. Check if the text is displayed on the screen.
SUB BRIGHT ADJUSTMENT (SBRT)
1. Input a cross-hatch signal.
2. Set to Service adjustment Mode.
3. Set the PICTURE and BRIGHT to minimum.
2. Set to Service adjustment Mode.
3. Set the PICTURE and BRIGHT to minimum.
4. Select SBRT with
and
.
5. Adjust with and
to obtain a faintly visible cross-hatch.
6. Write into the memory by pressing
then
.
SUB HUE, SUB COLOR ADJUSTMENT (SHUE, SCOL)
1: ON
0: OFF
0: OFF
SERVICE RON 1
5-2.
A BOARD ADJUSTMENTS
H. FREQUENCY ADJUSTMENT
1. Input a monoscope signal.
2. Set to Service adjustment Mode.
3. Connect a frequency counter to base of Q501
2. Set to Service adjustment Mode.
3. Connect a frequency counter to base of Q501
(TP-500 H. DRIVE).
4. Select the item of AFC, set to 3 level (free run).
5. Check H. Frequency for the 15650
±
200 Hz.
6. Select the item of AFC again, adjust the level "0".
7. Write into the memory by pressing
7. Write into the memory by pressing
then
.
V. FREQUENCY ADJUSTMENT
1. Select video 1 with no signal input.
2. Set the conditions with standard setting.
3. Connect the frequency counter across TP-508 or CN501
VDY (+) pin
6 connector and ground.
4. Check V. Frequency for the 50
±
2 Hz.
SUB CONTRACT ADJUSTMENT (SCON)
1. Input a color-bar signal.
2. Select the red color.
3. Set to Service adjustment Mode.
4. Select the item DCOL to "0" level.
5. Set the conditions as follows.
2. Select the red color.
3. Set to Service adjustment Mode.
4. Select the item DCOL to "0" level.
5. Set the conditions as follows.
PICTURE . . . . . . . . . . .
MAX
COLOR . . . . . . . . . . .
MIN
BRIGHT . . . . . . . . . . .
CENTER
R ON
. . . . . . . . . . .
ON (1)
G ON
. . . . . . . . . . .
OFF (0)
B ON
. . . . . . . . . . . OFF (0)
1.8
±
0.05 Vp-p
White
n
n
Black
1.70
±
0.05 Vp-p
SERVICE DISP 15
(5)
Feature ID Map
KV-
DESTINATION
ID-0
ID-1
ID-2
ID-3
ID-4
ID-5
1 2 1 X E 4 2 C
(E) 23 3 1
195
51 1
3
6
1
4
1. Input a color-bar signal.
2. Set to Service adjustment Mode.
2. Set to Service adjustment Mode.
— 26 —
KV-21XE42C
H. CENTER ADJUSTMENT (HPOS)
Note : Perform this adjustment after checking H. FREQUENCY.
1. Input a cross-hatch signal.
2. Set the Service adjustment Mode.
2. Set the Service adjustment Mode.
3. Select HPOS with and
.
4. Adjust with
and for the best horizontal center.
5. Write into the memory by pressing
then
/
/
V. SIZE (VSIZ)
/
?
H. CENTER (VPOS)
/
?
V. CENTER (VPOS)
V. LINEARITY (VLIN) AND V CORRECTION
1. Input a cross-hatch signal.
2. V. Correction is automatically adjusted from the circuit and
2. V. Correction is automatically adjusted from the circuit and
should satisfy the conditions below:
…
SERVICE ADJUSTMENT MODE MEMORY
1. Change DCOL to "1".
2. After completing all adjustments, press "0" then
.
3. Select the item DCOL and set to "0" level.
4. Connect an oscilloscope to
CN1752 Pin
6
(BLUE OUT) of
C Board and ground.
5. Select SHUE and SCOL with
and
.
6. Adjust with and
for the V1 = V4
±
0.1Vp-p (SCOL)
and V2 = V3
±
0.1Vp-p (SHUE).
V1
V2
V3
V4
7. Reset the item DCOL to "1" level.
8. Write into the memory by pressing
then
.
V. SIZE ADJUSTMENT ( VSIZ)
1. Input a cross-hatch signal.
2. Set to Service adjustment mode.
2. Set to Service adjustment mode.
3. Select VSIZ with
and
.
4. Adjust with and
for the best vertical size.
V. CENTER ADJUSTMENT (VPOS)
1.Input a cross-hatch signal.
2.Set to Service adjustment Mode.
2.Set to Service adjustment Mode.
3.Select VPOS with
and
.
4.Adjust with
and
for the best vertical center.
5.Write into the memory by pressing
then
READ FROM MEMORY
Green
0
SERVICE
READ
Red
6.2 CIRCUIT BOARD LOCATIONS
IC301, IC521, IC602, D572,
D573, D574, DY, C511,C574
C575, R578, R582, R583, R584,
R585, R586, R625, R626, R634,
R635,T504 (FBT)
D573, D574, DY, C511,C574
C575, R578, R582, R583, R584,
R585, R586, R625, R626, R634,
R635,T504 (FBT)
IC001, IC602, R030,
R626, R632, R633, R635,
R636, R637, R638, R639
R626, R632, R633, R635,
R636, R637, R638, R639
Part replaced (
]
)
• All voltages are in V.
• Voltage is DC with respect to ground unless otherwise
noted.
• Readings are taken with a 10M
• Voltage is DC with respect to ground unless otherwise
noted.
• Readings are taken with a 10M
Ω
digital multimeter.
• Readings are taken with a color-bar signal input.
• Voltage variations may be noted due to normal produc-
tion tolerance.
• Circled numbers are waveform references.
• Voltage variations may be noted due to normal produc-
tion tolerance.
• Circled numbers are waveform references.
•
: B + Line
•
: B - Line
•
m
: signal path
Reference Information
RESISTOR : RN
METAL FILM
: RC SOLID
: FPRD NON FLAMMABLE CARBON
: FUSE NON FLAMMABLE FUSIBLE
: RW
: FPRD NON FLAMMABLE CARBON
: FUSE NON FLAMMABLE FUSIBLE
: RW
NON FLAMMABLE WIREWOUND
: RS
NON FLAMMABLE METAL OXIDE
: RB
NON FLAMMABLE CEMENT
: ADJUSTMENT
RESISTOR
COIL : LF-8L MICRO INDUCTOR
CAPACITOR : TA TANTALUM
CAPACITOR : TA TANTALUM
: PS STYROL
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED
POLYESTER
: MPP METALIZED
POLYPROPYLENE
: ALB BIPOLAR
: ALT HIGH
: ALT HIGH
TEMPERATURE
: ALR HIGH
RIPPLE
- - - - -
Pitch: 5mm
Rating electrical power 1/4W
Rating electrical power 1/4W
• All resistors are in ohms.
K
Ω
=1000
Ω
, M
Ω
=1000K
Ω
•
f
nonflammable resistor.
•
∆
:
internal component.
•
p
: panel designation and adjustment for repair.
• All variable and adjustable resistors have charac-
teristic curve B, unless otherwise noted.
teristic curve B, unless otherwise noted.
• The components identified by
]
in this manual have
been carefully factory-selected for each set in order to
satisfy regulations regarding X-ray radiation. Should
replacement be required, replace only with the value
originally used.
satisfy regulations regarding X-ray radiation. Should
replacement be required, replace only with the value
originally used.
• When replacing components identified by
]
make the
necessary adjustments indicated. If results do not
meet the specified value, change the component
identified by
meet the specified value, change the component
identified by
[
and repeat the adjustment until the
specified value is achieved.
(Refer to R582 on page 21 & 22).
(Refer to R582 on page 21 & 22).
• When replacing parts in the table below be sure to
perform the related adjustment.
perform the related adjustment.
6.3 PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
Note:
•
•
All capacitors are in
µ
F unless otherwise noted.
pF:
µµ
F 50WV or less are not indicated except
for electrolytic and tantalums.
• All electrolytics are 50V unless otherwise specified
• Indication of resistance, which does not have one for
rating electrical power, is as follows:
• All electrolytics are 50V unless otherwise specified
• Indication of resistance, which does not have one for
rating electrical power, is as follows:
Adjustment (
[
)
HV HOLD-DOWN
(R582)
(R582)
B+ VOLTAGE
CONFIRMATION
CONFIRMATION
Note: The symbol
G
display is on the component side.
The components identified by shading and mark
¡
¡
¡
¡
¡
are
critical for safety. Replace only with part number
specified.
specified.
The symbol
G
indicates fast operating fuse.
Replace only with fuse of same rating as marked.
— 28 — — 29 — — 30 —
— 27 —
SECTION 6
DIAGRAMS
KV-21XE42C
6.1 BLOCK DIAGRAM
870 Block Diagram.p65 6/10/99, 10:28 AM
1
DIODE
IC
D001
G-10
IC001
I-10
D002
G-12
IC002
I-12
D003
I-8
IC003
J-11
D004
I-9
IC004
G-13
D038
I-11
IC200
G-3
D090
H-10
IC201
H-4
D201
H-3
IC301
H-9
D202
G-3
IC401
F-6
D203
J-13
IC521
F-4
D204
J-12
IC541
E-4
D205
G-3
IC601
B-9
D208
E-10
IC602
E-8
D209
J-12
TRANSISTOR
D210
I-2
Q001
G-10
D302
G-8
Q002
H-9
D310
H-9
Q202
F-7
D311
H-9
Q203
F-10
D403
F-11
Q204
F-10
D502
D-4
Q205
I-6
D541
F-4
Q300
G-9
D552
D-3
Q301
H-8
D561
D-2
Q302
G-8
D562
D-1
Q305
H-10
D571
D-3
Q390
J-6
D572
F-3
Q391
G-7
D573
F-3
Q392
H-10
D574
F-4
Q393
G-9
D581
F-3
Q394
G-9
D601
C-10
Q501
D-6
D602
E-10
Q502
B-6
D603
E-11
Q571
E-3
D605
D-10
Q601
E-9
D609
A-9
Q602
G-10
D610
B-10
Q604
F-9
D611
D-7
Q605
D-8
D613
C-8
Q607
A-12
D614
C-8
Q608
A-12
D615
A-16
Q650
H-6
D616
B-7
Q670
E-10
D617
C-7
D620
B-6
D631
C-11
D632
B-11
D633
B-12
D634
A-13
D635
A-13
D636
C-12
D637
A-13
D638
A-13
D650
H-7
A BOARD LOCATION LIST
— 31 —
— 32 —
— 33 —
— 34 —
[TUNING CONTROL, Y/C/J, POWER SUPPLY, DEFLECTION, TUNER/IF, AUDIO MTS]
A BOARD: IC541 TDA8172
A BOARD: IC401 TDA7057Q
A BOARD: IC301 CXA2060AS
KV-21XE42C
A Board
8
7
6
5
1
2
3
4
BUFFER
58K
58K
B
I
A
S
S
Vin1
SW1
Vin2
SW2
Vin3
V+
Gnd
Vout
Signal
Gnd
+
-
8
I + i
I - i
STABILIZER
TEMPERATURE
PROTECTION
+
4
REF
V
+
-
Vp
I + i
I - i
Power
Gnd 2
Gnd 2
9
12
Power
Gnd 1
Gnd 1
6
2
n.c
3
1
5
7
DC
Volume Control 2
Input 1
Input 2
DC
Volume Control 1
10
13
11
Pos.
Out 1
Neg.
Out 1
Pos.
Out 2
Neg.
Out 2
1
2
A BOARD: IC200, 201 NJM2521M
1
2
3
4
5
6
7
8
9
10
11
A
B
C
D
E
F
G
H
I
12
13
J
870 A PWB page.p65
6/10/99, 1:30 PM
1
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