Sony KD-36NX200U Service Manual ▷ View online
- 17 -
2-8. Service Position
To place the chassis in the service position, remove the
speaker assembly box (see 2-2.), remove the G1 and D2
brackets and position on the side of the main bracket as shown
above. Insert the main bracket firmly into the T-slot located on
the left corner of the beznet as indicated (see inset). To gain
access to the underside of the boards follow the instructions
on page 19. [Removal and Replacement of the main bracket
bottom plates].
speaker assembly box (see 2-2.), remove the G1 and D2
brackets and position on the side of the main bracket as shown
above. Insert the main bracket firmly into the T-slot located on
the left corner of the beznet as indicated (see inset). To gain
access to the underside of the boards follow the instructions
on page 19. [Removal and Replacement of the main bracket
bottom plates].
2-9. Wire Dressing 1
To avoid damage to the ground interconnecting leads from the
sharp edges of the heatsink they must be dressed as shown
above between the rear of the heatsink and the tuner.
sharp edges of the heatsink they must be dressed as shown
above between the rear of the heatsink and the tuner.
2-10. Wire Dressing 2
The sheathed end of the ground connecting lead must be
plugged into the F3 board to avoid the possibility of the AC
mains power touching ground.
plugged into the F3 board to avoid the possibility of the AC
mains power touching ground.
2-11. Wire Dressing 3
Ensure that wires do not touch heatsinks and high temperature
hotspots. All wires must be kept at a minimum distance of
20mm away from the EHT lead
hotspots. All wires must be kept at a minimum distance of
20mm away from the EHT lead
20mm
20mm
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How to handle the Anode-Cap
1 .
To prevent damaging the surface of the anode-cap do not use
sharp materials.
sharp materials.
2 .
Do not apply too great a pressure on the rubber, as this may cause
damage to the anode connector.
damage to the anode connector.
3 .
A metal fitting called a shatter hook terminal is fitted inside the
rubber cap.
rubber cap.
4 .
Do not turn the rubber foot over excessively, this may cause
damage if the shatter hook sticks out.
damage if the shatter hook sticks out.
Removal of the Anode-Cap
2-12. Picture Tube Removal
WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT even
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
after the power is disconnected. To
avoid electric shock, discharge CRT
before attempting to remove the anode
cap. Short between anode and CRT
coated earth ground strap.
Coated Earth
Ground Strap
Ground Strap
1. Remove Speaker Box assembly.
2. Discharge the anode of the CRT and remove the anode cap.
3. Unplug all interconnecting leads from the Deflection yoke, neck
2. Discharge the anode of the CRT and remove the anode cap.
3. Unplug all interconnecting leads from the Deflection yoke, neck
assy, degaussing coils and CRT grounding strap.
4. Remove the C1 Board from the CRT.
5. Remove the chassis assembly.
6. Loosen the Neck assembly fixing screw and remove.
7. Loosen the Deflection yoke fixing screw and remove.
8. Place the set with the CRT face down on a cushion and remove
5. Remove the chassis assembly.
6. Loosen the Neck assembly fixing screw and remove.
7. Loosen the Deflection yoke fixing screw and remove.
8. Place the set with the CRT face down on a cushion and remove
the Degaussing Coil holders.
9. Remove the Degaussing Coils.
10. Remove the CRT grounding strap and spring tensioners.
11. Unscrew the four CRT fixing screws [ located on each CRT
10. Remove the CRT grounding strap and spring tensioners.
11. Unscrew the four CRT fixing screws [ located on each CRT
corner ] and remove the CRT.
[Take care not to handle the CRT by the neck.]
[Take care not to handle the CRT by the neck.]
Anode button
a
REMOVAL PROCEDURE.
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
2
4
5
7
9
11
6
10
3
8
1
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REMOVAL AND REPLACEMENT OF THE MAIN
-
BRACKET
BOTTOM PLATES.
(1) REMOVING THE PLATES
In the event of servicing being required to the solder side of the A, D1 or G printed wiring
boards, 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 indicated by the
arrows.
boards, 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 indicated by the
arrows.
Note : There are 3 plates fitted to the main bracket and secured by 3 gates.
Only remove the necessary plate to gain access to the printed wiring board.
(2) REFITTING THE PLATES
Because the plates differ in size it is important that the correct plates are refitted in their original
location.
location.
Please note that the plates need to be rotated 180 degrees from their cut position to allow the
tabs to be fitted into their catch positions.
tabs to be fitted into their catch positions.
Tab
Catch
For safety reasons, on no account should the plates be removed
and not refitted after servicing.
and not refitted after servicing.
- 20 -
•
When complete readjustment is necessary or a new picture tube
is installed, carry out the following adjustments.
is installed, carry out the following adjustments.
•
Unless there are specific instructions to the contrary, carry out
these adjustments with the rated power supply.
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
.................................. normal
Brightness .................................. normal
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 TV set’s power and degauss with a degausser.
(1) Adjustment of Correction Magnet for Y-Splitting Axis.
1.
Input a crosshatch signal from the pattern generator.
2.
Set the Picture control to minimum and confirm that the
Brightness control is set to normal.
Brightness control is set to normal.
3.
Position the neck assembly as indicated in Fig.3-3.
4.
Loosen the deflection yoke fixing screw.
5.
Move the deflection yoke as far forward as is possible.
6.
Adjust the upper and lower pin symmetrically by opening or
closing the Y-splitting axis correction magnets located on the
neck assembly. [See Fig 3-2]
closing the Y-splitting axis correction magnets located on the
neck assembly. [See Fig 3-2]
7.
Return the deflection yoke to its original position and re-tighten
its fixing screw.
its fixing screw.
Carry out the adjustments in the following order :
3-1.
3-1.
Beam Landing and Geometry.
3-2.
Convergence.
3-3.
Focus.
3-4.
White Balance.
Note : Test equipment required.
1.
Color bar/pattern generator.
2.
Degausser.
3.
Oscilloscope.
4.
Digital multimeter.
Fig.3-1
(2) Landing and Geometry
Note : Before carrying out the following adjustments adjust the
magnets as indicated on page 21 [See Fig.3-4].
1.
Input a crosshatch signal from the signal generator.
2.
Rough-adjust the focus and horizontal convergence.
3.
Switch from the crosshatch pattern to an all-red pattern.
4.
Move the deflection yoke backwards and adjust with the purity
magnet so that the red is at the centre and it aligns
symmetrically [See Fig.3-5].
magnet so that the red is at the centre and it aligns
symmetrically [See Fig.3-5].
5.
Move the deflection yoke forward to the point where the entire
screen just becomes red [Mark its position].
screen just becomes red [Mark its position].
6.
Move the deflection yoke further forward until the screen just
changes colour at the edges. [Mark its position].
changes colour at the edges. [Mark its position].
7.
Position the deflection yoke between the two marks indicated
above.
above.
8.
Input a crosshatch pattern from the pattern generator and rotate
the deflection yoke so that the horizontal lines are parallel with
the top and bottom of the screen.
the deflection yoke so that the horizontal lines are parallel with
the top and bottom of the screen.
9.
When the position of the deflection yoke has been determined,
fasten it with its fixing screw.
fasten it with its fixing screw.
10. Once dy rotation and swing left and right for h linearity is ok on
cross hatch pattern, insert dy wedges. [See Fig.3-6].
11. Switch the pattern generator to green then blue and confirm the
purity.
12. If the beam does not land correctly in all the corners of the
screen, use disk magnets to correct it. [Confirm the corner
landing forgreen and blue].
landing forgreen and blue].
13. Re-check geometry for landing magnet effect. Adjust using
deflection menu. [TT Mode].
Caution :
High voltages are present on the Deflection yoke terminals - take care
when handling the Deflection yoke whilst carrying out adjustments.
High voltages are present on the Deflection yoke terminals - take care
when handling the Deflection yoke whilst carrying out adjustments.
Y-splitting axis correction magnet
Fig.3-2
Fig.3-3
SECTION 3 SET-UP ADJUSTMENTS
3-1. Beam Landing
Neck assy
G2
G1
+
Align the edge
of the neck assy on the
edge of the G3 grid closest
to the G2 grid.
of the neck assy on the
edge of the G3 grid closest
to the G2 grid.
G3
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