Sony KV-21R1A Service Manual ▷ View online
— 14 —
KV-21R1
SECTION 2
DISASSEMBLY
2-1. REAR COVER REMOVAL
2-2. SERVICE POSITION
A board
2
Rear Cover
1
Four screws
(BVTP 4x16)
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KV-21R1
2-3. PICTURE TUBE REMOVAL
•
HOW TO HANDLE AN ANODE-CAP
Don't damage the surface of anode-cap with sharp shaped material !
Don't press the rubber hardly not to hurt inside of anode-caps !
A metal fitting called as shatter-hook terminal is built into the rubber.
Don’t turn the foot of rubber over hardly !
The shatter-hook terminal will stick out or damage the rubber
Don't press the rubber hardly not to hurt inside of anode-caps !
A metal fitting called as shatter-hook terminal is built into the rubber.
Don’t turn the foot of rubber over hardly !
The shatter-hook terminal will stick out or damage the rubber
.
1
2
3
•
REMOVAL OF ANODE-CAP
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.
b
b
Anode button
a
* REMOVING PROCEDURES.
c
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
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
1
Anode cap
2
A board
C board
3
4
Deflection yoke
DGC holder
5
6
7
Spring tension
Degaussing coil
Four PT screws
8
Picture tube
9
Cushion
KV-21R1
— 16 —
SECTION 3
SET-UP ADJUSTMENTS
Preparation:
•
In order to reduce the influence of external magnetic
forces on the picture tube, face the TV set in an easterly
or westerly direction.
forces on the picture tube, face the TV set in an easterly
or westerly direction.
•
Turn the power switch for the unit ON and erase the
magnetic force using a degausser.
magnetic force using a degausser.
3-1. BEAM LANDING
Demagnetize with a degausser.
1.
1.
Input an all white raster signal from the pattern generator.
CONTRAST
BRIGHTNESS
BRIGHTNESS
2.
Switch the raster signal of the pattern generator to Red.
3.
Move the deflection yoke backward, and adjust with the
purity control so that Red is at the centre and the Blue and
Green are evenly spaced at the sides. see (Fig. 3-1 - 3-3)
purity control so that Red is at the centre and the Blue and
Green are evenly spaced at the sides. see (Fig. 3-1 - 3-3)
4.
Move the deflection yoke forward, and adjust so that the
entire screen becomes Red. (Fig. 3-1)
entire screen becomes Red. (Fig. 3-1)
5.
Switch the raster signal to Blue and then Green to confirm
the condition.
the condition.
6.
When the position of the deflection yoke has been
determined, tighten it with the deflection yoke mounting
screw.
determined, tighten it with the deflection yoke mounting
screw.
7.
When the landing at the corners is not correct, adjust by
using disk magnets. (Fig. 3-4)
using disk magnets. (Fig. 3-4)
Fig. 3-1
normal
Perform the adjustments in the following order:
1.
1.
Beam Landing
2.
Convergence
3.
Screen (G2), Drive, White Balance, Sub Colour and
Sub Brightness.
Sub Brightness.
4.
Focus
Note: Test Equipment Required.
1. Colour bar/Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital multimeter
5. Oscilloscope
2. Degausser
3. DC Power Supply
4. Digital multimeter
5. Oscilloscope
•
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
realignment is required or a new picture tube is installed.
•
These adjustments should be performed with the rated
power supply voltage, unless otherwise noted.
power supply voltage, unless otherwise noted.
The Contrast and Brightness controls should be set as follows
unless otherwise noted:
unless otherwise noted:
CONTRAST control ............... 80%
(or Normal by commander)
BRIGHTNESS control ........... 50%
Purity control
Fig. 3-2
Fig. 3-3
Fig. 3-4
GRN
BLU
RED
Green
Blue
Red
Purity control corrects
this area
Disk magnets or
rotatable disk
magnets correct
these areas (a-d).
Deflection yoke pos.
corrects these areas
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