Sony KP-51DS1U Service Manual ▷ View online
– 29 –
KP-51DS1U
K
RM-892
3-9. N AND A2 BOARDS REMOVAL
3-10. E BOARD REMOVAL
5
N board
4
Claw
3
N shield
6
Pin cable
7
Two claws
2
A2 bracket
1
Two bosses
8
A2 board
1
Two screws
(+BVTP 3 x 12)
(+BVTP 3 x 12)
3
E board
2
Three claws
– 30 –
KP-51DS1U
K
RM-892
3-11. G BOARD REMOVAL
3-13. PICTURE TUBE REMOVAL
3-12. HIGH-VOLTAGE
CABLE REMOVAL
AND INSTALLATION
AND INSTALLATION
1
Rubber cap
2
HV cable
turn 90
turn 90
°
2
Rubber cap
1
HV cable
Hook
Gutter
(1) Removal
(2) Installation
2
G board
1
Four claws
1
Two claws
Removing the arrow-marked screw is strictly inhibited.
If removed, it may cause liquid spill.
If removed, it may cause liquid spill.
1
Four screws
(+BVTP 4 x 16)
(+BVTP 4 x 16)
2
Lens
6
Four screws
(+BVTP 4 x 16)
(+BVTP 4 x 16)
7
Picture
tube
tube
5
Deflection
yoke
yoke
4
Neck
assembly
assembly
3
CR board
– 31 –
KP-51DS1U
RM-892
SECTION 4
SET-UP ADJUSTMENTS
4-1. SCREEN VOLTAGE ADJUSTMENT
(ROUGH ALIGNMENT)
1. Receive the Monoscope signal.
2. Set 50% BRIGHTNESS and minimum PICTURE.
3. Turn the red VR on the focus pack all the way to the left
2. Set 50% BRIGHTNESS and minimum PICTURE.
3. Turn the red VR on the focus pack all the way to the left
and then gradually turn it to the right until the point where
you can see the retrace line.
you can see the retrace line.
4. Next gradually turn it to the left to the position where the
retrace line disappears.
Fig. 4-1
Fig. 4-5
Fig. 4-4
Lens
Fig. 4-3
4-2. FOCUS ADJUSTMENT
1. Loose the lens screw.
2. Set in service mode. (Refer to SECTION 6.)
3. Place the caps on the red and blue lens so that only the green
color is shown.
4. Press “MENU” on the Commander and select Convergence
and OSD CHSW = “00” to display the test signal (crosshatch)
on the screen.
5. Rotate the green lens and align with the optimal focus point
from the test signal.
6. Rotate the green focus VR on the focus pack and align to
obtain the optimal focus point.
7. Perform the same alignment for red and blue lenses and elec-
tric focus.
8. Fix lens screw.
Fig. 4-2
Test signal
4-3. SCREEN (G2) ADJUSTMENT
1. Connect JIG (A) to 200 V and GND.
2. Select VIDEO1 mode without signals.
3. Connect JIG to the TP701(KR), TP731(KG) or TP761(KB)
of CR board, CG board and CB board.
4. Adjust R, G and B screen voltage to until retrace line disap-
pears with screen VR on the focus pack.
4-4. DEFLECTION YOKE TILT ADJUSTMENT
1. Set to receive the Monoscope signal.
2. Place the caps on the red and blue lens so that only the green
color.
3. Loosen the deflection yoke setscrew and align the tilt of the
Deflection yoke so that the bars at the center of the monoscope
pattern are horizontal.
4. After aligning the deflection yoke, fasten it securely to the
funnel-shaped portion (neck) of the CRT.
5. The tilt of the deflection yoke for red and blue is aligned the
same as was done for green.
Fig. 4-6
KR, KG, KB
5.6K/3W X3
<2.2K/3W>
GND
200V
(A)
Neck Assy
Make sure deflection yoke is
touching CRT closely.
touching CRT closely.
2-pole magnet
4-pole magnet
Deflection yoke
Anode cap
R
G
SCREEN
B
R
G
FOCUS
Focus Pack
B
Minimize both A and B.
A
B
Scanning line visible.
– 32 –
KP-51DS1U
RM-892
4-5. 2-POLE MAGNET ADJUSTMENT
1. Set to receive the Dot signal.
2. Place the caps on the red and blue lens so that only the green
2. Place the caps on the red and blue lens so that only the green
color is shown.
3. Turn the green focus VR on the focus pack to the right and
set to over focus to enlarge the spot.
4. Now align the 2-Pole Magnet so that the enlarged spot is in
the center of the just focus spot.
5. Align the green focus VR and set for just (precise) focus.
6. Perform the same alignment for red and blue.
6. Perform the same alignment for red and blue.
Fig. 4-7
4-6. 4-POLE MAGNET ADJUSTMENT
1. Set to receive the Dot signal.
2. Place the caps on the red and blue lens so that only the green
2. Place the caps on the red and blue lens so that only the green
color is shown.
3. Turn the green focus VR on the focus pack to the left and set
to under focus to enlarge the spot.
4. Now align the 4-Pole Magnet so that the enlarged spot be-
comes a perfect circle.
5. Perform the same alignment for red and blue.
Fig. 4-8
4-7. DEFOCUS ADJUSTMENT (Blue)
1. Receive the Dot signal.
2. Place the caps on the red and green lens so that only the blue
2. Place the caps on the red and green lens so that only the blue
color is shown.
3. Rotate the blue focus VR on the focus pack and adjust to
obtain best electrical focus.
4. Rotate the blue focus VR on the focus pack clockwise, so
that diameter of the dot see caution.
[How to Blue Defocus]
Fig. 4-10
8 mm Max.
4-8. GREEN AND RED FOCUS ADJUSTMENT
4-8-1. Green and Red Lens Focus Adjustment
1. Input a monoscope signal.
2. Place the caps on the red and blue lens so that only the green
2. Place the caps on the red and blue lens so that only the green
color is shown.
3. Rotate the Green lens and adjust to obtain the best lens focus.
4. Fix lens screw.
5. Repeat above process for Red.
4. Fix lens screw.
5. Repeat above process for Red.
4-8-2. Green and Red Electrical Focus Adjustment
1. Input a monoscope signal.
2. Place the caps on the red and blue lens so that only the green
2. Place the caps on the red and blue lens so that only the green
color is shown.
3. Rotate the green focus volume on the focus pack and adjust
to obtain an optimal electrical focus in center.
4. Repeat above process for Red.
Fig. 4-11
Adjust Point
Use the center dot
Use the center dot
OK
NG
NG
k
Just Focus
1.5 vs Green Defocus
[Change Blue Defocus]
Fig. 4-9
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