Sony KV-29FV15A Service Manual ▷ View online
— 25 —
KV-29FV15A/34FV15A/38FX250A
3-2. CONVERGENCE
(1) Vertical and Horizontal Static Convergence
1.
Adjust V. STAT magnet to converge red, green and blue
dots in the center of the screen. (Vertical movement)
dots in the center of the screen. (Vertical movement)
B
G
R
V.STAT
Magnet
Center dot
Tilt the V. STAT magnet and adjust static convergence
to open or close the V. STAT magnet.
to open or close the V. STAT magnet.
2.
When the V. STAT magnet is moved in the direction of
arrow a and b, red, green, and blue dots move as
shown below:
arrow a and b, red, green, and blue dots move as
shown below:
B
R
G
B
R
G
R
G
B
G
R
B
G
B
R
B
G
R
1
2
3
a
b
a
b
b
b
a
a
b
b
a
b
a
b
Operation of BMC (Hexapole) Magnet
The respective dot positions resulting from moving each
magnet interact, so perform adjustment while tracking.
magnet interact, so perform adjustment while tracking.
Use the VSTAT tabs to adjust the red, green, and blue dots so
they line up at the center of the screen (move the dots in a
horizontal direction.)
they line up at the center of the screen (move the dots in a
horizontal direction.)
R G
B
R
G
B
R
G B
R
G
B
R
G
B
R
G
B
Y Separation Axis Correction Magnet Adjustment
1.
Input cross-hatch pattern, adjust PICTURE to minimum
and BRIGHTNESS to normal.
and BRIGHTNESS to normal.
2.
Adjust the deflection yoke upright so it touches the CRT.
3.
Adjust so that the Y separation axis correction magnet on
the neck assembly is symmetrical from top to bottom
(open state).
the neck assembly is symmetrical from top to bottom
(open state).
Purity
V. STAT
BMC (Hexapole)
4. Return the deflection yoke to its original position.
Preparation:
•
Before starting, perform FOCUS, V. LIN and V. SIZE adjustments.
•
Set BRIGHTNESS control to minimum.
•
Input dot pattern.
— 26 —
KV-29FV15A/34FV15A/38FX250A
(2) Dynamic Convergence Adjustment
•
Before starting, perform Horizontal and Vertical
Static Convergence Adjustment.
Static Convergence Adjustment.
1.
Slightly loosen deflection yoke screw.
2.
Remove deflection yoke spacers.
3.
Move the deflection yoke for best convergence as
shown below:
shown below:
B G R B
G
R
R
B
G
R
R
G
B
R G B
R G B
R G B B G R
R G B R
G
B
B
R
G
B
B G R
4.
Tighten the deflection yoke screw.
5.
Install the deflection yoke spacers.
(3) Screen-corner Convergence
Affix a permalloy assembly corresponding to the
misconverged areas:
misconverged areas:
a
b
c
d
b
a
d
c
a-d : screen-corner
misconvergence
misconvergence
(4) TLH Plate Adjustment
•
Input crosshatch pattern
•
Adjust PICTURE QUALITY to standard, PICTURE and
BRIGHTNESS to␣ 50%, and OTHER to standard.
BRIGHTNESS to␣ 50%, and OTHER to standard.
•
Adjust the Horizontal Convergence of red and blue dots
by␣ tilting the TLH plate on the deflection yoke.
by␣ tilting the TLH plate on the deflection yoke.
TLH Plate
YCH
RV1750
V.STAT
V.STAT
XCV
C Board
TLV
(TLV)
1. Adjust XCV core to balance X axis.
2. Adjust YCH VR to balance Y axis.
3. Adjust vertical red and blue convergence with V.TILT
(TLV␣ VR.)
Perform adjustments while tracking items 1␣ and␣ 2.␣
(5 ) H Center SW Adjustment
•
Before adjusting H Center SW (S501, S502), make sure
that HPOS data is "7".
that HPOS data is "7".
B R R B
(R)(B) (B)(R)
(R)(B) (B)(R)
TLH+
TLH-
TLH-
— 27 —
KV-29FV15A/34FV15A/38FX250A
8.
Push the JUMP again to release the cut off.
3-5. WHITE BALANCE ADJUSTMENTS
NO.
Disp.
Item
All Models
24
RDRV
Red Drive
31
25
GDRV
Green Drive
31
26
BDRV
Blue Drive
31
27
RCUT
Red Cut-off
7
28
GCUT
Green Cut-off
7
29
BCUT
Blue Cut-off
7
38
SBRT
Sub Bright
7
1.
Set program palette to "STANDARD" and push
"RESET.
"RESET.
2.
Input an entire white signal.
3.
Set to Service adjustment Mode.
4.
Set the PICTURE and BRIGHT to minimum.
5.
Adjust with SBRT if necessary.
6.
Set RCUT to "14".
7.
Select GCUT and BCUT with 1 and 4.
8.
Adjust with 3 and 6 for the best white balance.
9.
Set the PICTURE and BRIGHT to maximum.
10. Select GDRV and BDRV with 1 and 4.
11. Adjust with 3 and 6 for the best white balance.
12. Write into the memory by pressing
11. Adjust with 3 and 6 for the best white balance.
12. Write into the memory by pressing
then
**.
NOTE:
White Balance should be adjusted after Sub Contrast
because RDRV is also used in Sub Contrast adjustment.
(See page 29)
White Balance should be adjusted after Sub Contrast
because RDRV is also used in Sub Contrast adjustment.
(See page 29)
325 MARK
CENTER
CIRCLE
35 MARK
35
325
3-3. FOCUS
1.
Input Monoscope signal.
2.
Set user controls to normal.
3.
Set Video mode to STANDARD.
4.
Set the PICTURE to maximum.
5.
Adjust FOCUS control for best picture at center circle.
6.
Then receive an entire white signal. Make sure
Magenta Ring is at acceptable level
Magenta Ring is at acceptable level
3-4. SCREEN (G2)
1.
Input signal from the pattern generator.
2.
Set the user controls to NORMAL.
3.
Attach the G2-Jig to the C Board.
4.
Adjust RCUT, GCUT, BCUT, and SBRT in service
mode with an oscilloscope so that voltages on the
red, green, and blue cathodes are 170 + 2 V DC.
mode with an oscilloscope so that voltages on the
red, green, and blue cathodes are 170 + 2 V DC.
5.
Observe the screen and adjust SCREEN (G2) VR to
obtain the fairly visible background of dot signal.
obtain the fairly visible background of dot signal.
6.
Push the TEST +JUMP (+ Channel) to cut off the
signal, then the screen is bright or dark. Brightness
of raster must be increased when adjusting.
signal, then the screen is bright or dark. Brightness
of raster must be increased when adjusting.
7.
Adjust screen VR until the screen is just cut off, or
scarcely lights up. A signal cannot be seen when the
brightness of the raster is high.
scarcely lights up. A signal cannot be seen when the
brightness of the raster is high.
NN
NN
pedestal
NN
GND
170 + 2 Vdc
— 28 —
KV-29FV15A/34FV15A/38FX250A
Always perform the following adjustments when replacing the
following components marked with a
]
mark on the schematic
diagram:
A BOARD:
IC355, IC501, D302, D519, D520, D521, C531,
C532, Q301, R356, R359, R361, R387, R529,
R530, R531, R532, R 533, R550, T503
C532, Q301, R356, R359, R361, R387, R529,
R530, R531, R532, R 533, R550, T503
GA BOARD: IC6003, R6088
Step 1
Preparation before Confirmation
Turn the POWER switch ON.
Input a white signal and set the PICTURE and BRIGHT
controls to maximum.
controls to maximum.
Confirm that, when the set is operating normally, the
voltage at check terminal TP85 is more than 23.0 V DC.
voltage at check terminal TP85 is more than 23.0 V DC.
At AC input: 120.0
±
2.0 VAC
Step 2
29" Input a white signal and verify that I ABL is within the
29" Input a white signal and verify that I ABL is within the
specified range: 1730.0 + 100
µ
A, +B = 135.5 + 1 VDC .
At AC input: 120.0
±
2.0 VAC
34"/38" Input a white signal and verify that I ABL is within the
specified range: 2062.5 + 100
µ
A, +B = 135.5 + 1 VDC .
At AC input: 120.0
±
2.0 VAC
+
I ABL
ABL
T503
FBT
range
-
ammeter
3.0 mA DC
A
Step 3
Record the voltage between TP85 and ground.
Step 4
Using an external DC power supply, apply voltage
between TP85 and ground.
between TP85 and ground.
Increase the voltage gradually and confirm that the
holdown works (raster disappears) at lower than the
voltage recorded in Step 3.
holdown works (raster disappears) at lower than the
voltage recorded in Step 3.
29" Lower than 24.78 + (-0.1) V DC.
At AC input: 120.0
±
2.0 VAC
34" Lower than 26.95 + (-0.1) V DC.
At AC input: 120.0
±
2.0 VAC
38" Lower than 22.05 + (-0.1) V DC.
At AC input: 120.0
±
2.0 VAC
A BOARD - CONDUCTOR SIDE
Step 5
Confirm that a voltage appears between TP85 and
ground, of more than 23.0 V DC.
ground, of more than 23.0 V DC.
At AC input: 120.0
±
2.0 VAC
SECTION 4
SAFETY RELATED ADJUSTMENTS
Always perform the following adjustments when replacing the
following components marked with
following components marked with
] on the schematic diagram:
GA BOARD:
IC6003, R6088
1)
Using Variac, apply AC input voltage: 130.0
±
2.0 VAC
2)
Input a monoscope signal.
3)
Set the PICTURE control and the BRIGHT control to
initial reset value.
initial reset value.
4)
Confirm the voltage of GA Board CN6007, between pin
1 to ground on "GA" PWB is less than 135.5 + 1.0 V DC.
1 to ground on "GA" PWB is less than 135.5 + 1.0 V DC.
5)
If step 4 is not satisfied, replace R6088 and repeat the
above steps.
[
R530, R531 CONFIRMATION METHOD (HOLD-DOWN CONFIRMATION) AND READJUSTMENTS
B+ VOLTAGE CONFIRMATION AND ADJUSTMENT
+
-
+
-
A
+
-
11
T503
FBT
FBT
TP85
R531
R530
DC Power Supply
digital multimeter
ammeter
3mA DC range
3mA DC range
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