Sony KP-48V75 / KP-53V75 / KP-61V75 Service Manual ▷ View online
– 33 –
KP-48V75/53V75/61V75
RM-Y903
RM-Y903
RM-Y903
(2) SETTING OF SERVICE STAY ASSY.
(KP-48V75/53V75)
Picture tube bracket assy
2
Six screws
(+BVTP 4X12)
Notch
Hook
4
Six screws
(+BVTP 4X12)
Notch
Hook
1
Side board (L)
3
Side board (R)
1) Lift up picture tube bracket assy and fit the hook of
1
side board (L) to the notch on the assy.
Then fix then with
2
six screws (+BVTP 4X12).
2) Lift up picture tube bracket assy and fit the hook of
3
side board (R) to the notch on the assy.
Then fix then with
4
six screws (+BVTP 4X12).
(3) INSTALL A CHASSIS ASSY AND CARRY THE PICTURE TUBE BRACKET
2
HA board
1
Chassis assy
Chassis stays
1) Put
1
chassis assy on chassis stays.
2) Put
2
HA board on
1
chassis assy
3) Put your hands to side board (L) and (R).
4) You can carry the chassis assy in this condition.
4) You can carry the chassis assy in this condition.
*
When carrying the chassis assy, be careful not to touch the CR, CG or CB boards with your legs.
– 34 –
KP-48V75/53V75/61V75
RM-Y903
RM-Y903
RM-Y903
3-1. 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 block all the way to the left
2. Set 50% BRIGHTNESS and minimum PICTURE.
3. Turn the red VR on the FOCUS block 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.
3-3. SCREEN (G2) ADJUSTMENT
1. Select VIDEO mode without signals.
2. Connect an oscilloscope to the TP701(KR), TP731(KG) and
2. Connect an oscilloscope to the TP701(KR), TP731(KG) and
TP761(KB) of CR board, CG board and CB board.
3. Adjust R, G and B screen voltage to 170 – 173V with screen
VR on the focusblock.
3-4. FOCUS VR ADJUSTMENT
1. Set in service mode.
2. Use VP on the service mode menu to shown only the green
2. Use VP on the service mode menu to shown only the green
color.
3. Press the Commander Menu button (convergence) and out-
put the test signal (crosshach).
4. Rotate the green VR on the FOCUS block and align to ob-
tain the optimal focus point.
5. Use RG-RH from the service mode menu to set to green and
red.
6. Output the test signal and rotate the red VR to obtain the
optimum focus at the point where the red and green spots
overlap.
overlap.
7. Use RG-BH from the service mode menu to set to red and
blue.
8. Output the test signal and rotate the blue VR aligning to ob-
tain the optimum focus at the point where the blue and green
spots overlap.
spots overlap.
R
G
B
SCREEN
R
G
B
FOCUS
FOCUS block
Fig. 3-1
170
}
VDC
pedestal
GND
Fig. 3-3
Scanning line visible.
A
B
Minimize both A and B.
Fig. 3-5
Lens
Fig. 3-4
3-2. FOCUS LENS ADJUSTMENT
1. Loose the lens screw.
2. Set in service mode.
3. Use VP on the service mode menu to shown only the green
2. Set in service mode.
3. Use VP on the service mode menu to shown only the green
color.
4. Press the Commander Menu button and select FEATURES
and CONVERGENCE to display the test signal (crosshatch)
on the screen.
on the screen.
5. Rotate the green lens and align with the optimal focus point
from the test signal.
6. Use RG-RH from the service mode menu to set to green and
red.
7. Output the test signal and rotate the red lens to obtain the
optimum focus at the point where the red and green spots
overlap.
overlap.
8. Use RG-BH from the service mode menu to set to red and
blue.
9. Output the test signal and rotate the blue lens to obtain the
optimum focus at the point where the blue and red spots over-
lap.
lap.
10. Tighten the lens screw.
Fig. 3-2
pedestal
Minimize both A and B.
B
A
Scanning line visible.
Test signal
170
–
173V
SECTION 3
SET-UP ADJUSTMENTS
– 35 –
KP-48V75/53V75/61V75
RM-Y903
RM-Y903
RM-Y903
3-5. DEFLECTION YOKE TILT ADJUSTMENT
1. Set to receive the Monoscope signal.
2. Set in service mode.
3. Use VP on the service mode menu to show only the green
2. Set in service mode.
3. Use VP on the service mode menu to show only the green
color.
4. Loosen the deflection yoke set screw and align the tilt of the
Deflection Yoke so that the bars at the center of the monoscope
pattern are horizontal.
pattern are horizontal.
5. After aligning the deflection yoke, fasten it securely to the
funnel-shaped portion (neck) of the CRT.
6. The tilt of the deflection yoke for red is aligned with RG-RH
on the service mode menu, and the tilt on the deflection yoke
for biue is aligned with RG-BH on the service menu, is aligned
the same as was done for green.
for biue is aligned with RG-BH on the service menu, is aligned
the same as was done for green.
3-7. 4-POLE MAGNET ADJUSTMENT
1. Set in service mode.
2. Set to receive the Dot signal.
3. Remove CN302 connector for A board
4. Place the caps on the red and blue lens so that only the green
2. Set to receive the Dot signal.
3. Remove CN302 connector for A board
4. Place the caps on the red and blue lens so that only the green
color is shown.
5. Turn the green VR on the focus block to the left and set to
underfocus to enlarge the spot.
6. Now align the 4-Pole Magnet so that the enlarged spot be-
comes a perfect circle.
7. Perform the same alignment for red and blue.
3-8. DEFOCUS ADJUSTMENT (Blue)
1. Receive the crosshatch signal
2. Adjust the FOCUS knob so that the crosshatch pattern verti-
2. Adjust the FOCUS knob so that the crosshatch pattern verti-
cal line width is as in the figure on the right.
3. Blue only defocus Adjustment.
Fig. 3-6
Neck Assy
2-pole magnet
4-pole magnet
Deflection yoke
Anode cap
3-6. 2-POLE MAGNET ADJUSTMENT
1. Set in service mode.
2. Set to receive the Dot signal.
3. Place the caps on the red and blue lens so that only the green
2. Set to receive the Dot signal.
3. Place the caps on the red and blue lens so that only the green
color is shown.
4. Turn the green VR on the focus block to the right and set to
overfocus to enlarge the spot.
5. Now align the 2-Pole Magnet so that the enlarged spot is in
the center of the Just Focus spot.
6. Align the green focus VR and set for just (precise) focus.
7. Perform the same alignment for red and blue.
7. Perform the same alignment for red and blue.
Fig. 3-7
Use the center dot
Use the center dot
Fig. 3-8
[Focus adjustment point]
/
x
y
x : y = 1:1
48” : 12–15mm
53” : 13–16mm
61” : 13–16mm
53” : 13–16mm
61” : 13–16mm
Fig. 3-9
– 36 –
KP-48V75/53V75/61V75
RM-Y903
RM-Y903
RM-Y903
3-9. ELECTRICAL ADJUSTMENT BY REMOTE
COMMANDER
By using Remote Commander (RM-Y903),all circuit adjustments
can be made.
NOTE : Test Equipment Required.
1.
Pattern Generator
2.
Frequency counter
3.
Digital multimeter
4.
Audio oscillator
1. METHOD OF SETTING THE SERVICE ADJUSTMENT MODE
SERVICE MODE PROCEDURE
1. Standby mode. (Power off)
2.
2.
DISPLAY
n
5
n
VOL (+)
n
TV POWER
on the Remote Commander.
(Press each button within a second.)
(Press each button within a second.)
SERVICE MODE ADJUSTMENT
5
+
(
)
3. The CRT displays the item being adjusted.
4. Press 1 or 4 on the Remote Commander to select the item.
5. Press 3 or 6 on the Remote Commander to change the data.
6. Press 2 or 5 on the Remote Commander to select the cat-
4. Press 1 or 4 on the Remote Commander to select the item.
5. Press 3 or 6 on the Remote Commander to change the data.
6. Press 2 or 5 on the Remote Commander to select the cat-
egory.
7. If you want to recover the latest values press 7 then [ENTER] to
read the memory.
8. Press [MUTING] then [ENTER] to write into memory.
SERVICE MODE ADJUSTMENT
8. Press 8 then [ENTER] on the Remote Commander to initialize.
9. Turn set off and on to exit.
9. Turn set off and on to exit.
2. MEMORY WRITE CONFIRMATION METHOD
1. After adjustment, remove the plug from AC outlet, and then
replace the plug in AC outlet again.
2. Turn the power switch ON and set to Service Mode.
3. Call the adjusted items again and confirm they were adjusted.
3. Call the adjusted items again and confirm they were adjusted.
MUTING
WRITE
↓
ENTER
Category Adjustment item
DATA
SERVICE VP VPOS 31
0000 0
0000 0
SERVICE VP VPOS 31
0000 0
0000 0
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