Sony KV-32WS2B Service Manual ▷ View online
21
2-4-2. SERVICE POSITION (2)
2-5. A BOARD REMOVAL
2-6. A EXTENSION BOARD
1 Remove CN301 before removing A board
A Board
A board
BE-3D Extension Board
Clip bracket into Beznet
2-7. A1 EXTENSION BOARDS
A1 Board
22
Cushion
8 Coil Demagnetic
9 Spring Extension
6 Chassis
1 Two screws
2 Speaker
15 Picture tube
2-8. PICTURE TUBE REMOVAL
Anode button
a
* REMOVING PROCEDURES.
Turn up one side of the rubber cap in
the direction indicated by the arrow a
the direction indicated by the arrow a
1
2 Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow b
firmly in the direction indicated by the
arrow b
3 When one side of the rubber cap is
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling it up in
the direction of the arrow c
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling it up in
the direction of the arrow c
b
b
c
Note : Short circuit the anode of the picture tube and the anode cap to the metal chassis, CRT
shield or carbon paint on the CRT, after removing the anode.
shield or carbon paint on the CRT, after removing the anode.
• REMOVAL OF ANODE-CAP
•
HOW TO HANDLE THE ANODE-CAP
1
To prevent damaging the surface of the anode-cap do not use sharp materials.
2
Do not apply too great a pressure on the rubber, as this may cause damage to the
anode connector.
anode connector.
3
A metal fitting called a shatter hook terminal is fitted inside the rubber cap.
Do not turn the rubber foot over excessively this may cause damage if the shatter
hook sticks out.
Do not turn the rubber foot over excessively this may cause damage if the shatter
hook sticks out.
11 VM board
10 C board
12 Neck assy
13 Deflection
yolk
yolk
4 Speaker
5 Anode cap
7 DGC holders
14 Four Tapping
Screws (m)
Screws (m)
3 Two screws
23
REMOVAL AND REPLACEMENT OF THE MAIN-BRACKET
BOTTOM PLATES.
BOTTOM PLATES.
(1) REMOVING THE PLATES
In the event of servicing being required to the solder side of the D Board printed
circuit, the bottom plates fitted to the main chassis bracket require to be removed.
This is performed by cutting the gates with a sharp wire cutter at the locations
shown and indicated by arrows.
circuit, the bottom plates fitted to the main chassis bracket require to be removed.
This is performed by cutting the gates with a sharp wire cutter at the locations
shown and indicated by arrows.
Note : There are 5 plates fitted to the main bracket and secured by 4 or 6 gates.
Only remove the necessary plate to gain access to the circuit board.
FOR SAFETY REASON THIS
PLATE MUST BE REMOUNTED
AFTER CUTTING AND
TAKING AWAY.
Fig 1
For safety reasons, on no account should the plates be removed
and not refitted after servicing.
and not refitted after servicing.
Because the plates differ in size it is important that the correct plates are refitted in their
original location.
The plates are identified by markings A-B-C-D-E on their top side.
original location.
The plates are identified by markings A-B-C-D-E on their top side.
1.
Identify the plate by locating its marking.
2.
Turn the plate over noting where the marking is located.
3.
Locate the corresponding marking indicated on the main chassis bracket. See Fig 2.
4.
Refit the plate as indicated in Fig 3 with the markings located next to each other.
(2) REFITTING THE PLATES
FOR SAFETY REASON THIS
PLATE MUST BE REMOUNTED
AFTER CUTTING AND
TAKING AWAY.
ATTENTION
FOR SAFETY REASON THIS
PLATE MUST BE REMOUNTED
AFTER CUTTING AND
TAKING AWAY.
ATTENTION
E
D
INDEX MARKING
AT BRACKET FRAME
Fig 2
In the event of the plates requiring to be
removed at a later stage, this can be achieved
by inserting a screwdriver in the snap-recess
indicated as in Fig 4 and lifting out.
removed at a later stage, this can be achieved
by inserting a screwdriver in the snap-recess
indicated as in Fig 4 and lifting out.
INSERT FROM
THE BOTTOM
SIDE
THE BOTTOM
SIDE
Fig 3
MAIN BRACKET
Fig 4
24
•
When complete readjustment is necessary or a new
picture tube is installed, carry out the following
adjustments.
picture tube is installed, carry out the following
adjustments.
•
Unless there are specific instructions to the contrary,
carry out these adjustments with the rated power supply.
carry out these adjustments with the rated power supply.
•
Unless there are specific instructions to the contrary, set the
controls and switches to the following settings :
controls and switches to the following settings :
Contrast
...............
80% [or remote control normal]
Brightness
...............
50%
Carry out the following adjustments in this order :
3-1.
3-1.
Beam Landing
3-2.
Convergence
3-3.
White balance
3-4.
Focus
Note :
Test equipment required
1.
1.
Color bar/pattern generator.
2.
Degausser.
3.
Oscilloscope.
4.
Digital multimeter.
5.
DC Power supply.
SECTION 3
SET-UP ADJUSTMENTS
a
b
c
d
a
c
b
d
Purity control corrects
this area.
this area.
Deflection yolk positioning
corrects these areas.
corrects these areas.
Disk magnets or
rotatable disk
magnets correct
these areas (a - d).
rotatable disk
magnets correct
these areas (a - d).
GREEN
BLUE
RED
Purity control
Neck Assy
A buckle
G2
G1
Deflection yolk
Preparation:
1.
In order to reduce the influence of geomagnetism on the set’s
picture tube, face it in an easterly or westerly direction.
picture tube, face it in an easterly or westerly direction.
2.
Switch on the set’s power and degauss with the
degausser.
degausser.
3-1. BEAM LANDING
1.
Input an all white signal from the pattern generator.
Set the Contrast and Brightness to normal.
Set the Contrast and Brightness to normal.
2.
Set the pattern generator raster signal to Red.
3.
Move the deflection yolk forward and adjust with the purity
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
4.
Move the deflection yolk forward and adjust so that the entire
screen becomes Red. [See Fig.3-1]
screen becomes Red. [See Fig.3-1]
5.
Switch the raster signal to Blue, then to Green and verify the
condition.
condition.
6.
When the position of the deflection yolk has been determined,
fasten the deflection yolk with the screws.
fasten the deflection yolk with the screws.
7.
If the beam does not land correctly in all the corners, use a
magnet to correct it. [See Fig.3-4]
magnet to correct it. [See Fig.3-4]
Fig. 3-1
Fig. 3-2
Fig. 3-3
Fig. 3-4
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