Set-Up Adjustments - Sony KP-48V75 Service Manual

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
and then gradually turn it to the right until the point where
you can see the retrace line.
4. Next gradually turn it to the left to the position where the
retrace line disappears.
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
color.
4. Press the Commander Menu button and select FEATURES
and CONVERGENCE 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. 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.
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.
10. Tighten the lens screw.

SET-UP ADJUSTMENTS

R G B
SCREEN
R G B
FOCUS
FOCUS block
Fig. 3-1
Test signal
Fig. 3-2
SECTION 3
3-3. SCREEN (G2) ADJUSTMENT
1. Select VIDEO mode without signals.
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.
GND
3-4. FOCUS VR ADJUSTMENT
1. Set in service mode.
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.
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.
Lens
Fig. 3-4
– 34 –
–
170 VDC
170 173V }
pedestal
pedestal
Fig. 3-3
Scanning line visible.
Scanning line visible.
A
A
Minimize both A and B.
Minimize both A and B.
B
B
Fig. 3-5