Set-Up Adjustments; Screen Voltage Adjustment (Rough Alignment); Screen (G2) Adjustment (Fine Adjustment); Blue Offset Adjustment - Sony KP-FR43M31 Service Manual

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 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.
4. Next gradually turn it to the left to the position where the
retrace line disappears.
Focus Pack
B
SCREEN
B
Fig. 3-1
3-2. SCREEN (G2) ADJUSTMENT
(FINE ADJUSTMENT)
1. Turn on the power of the set.
2. Select VIDEO1 and make no signal input.
3. Supply DC (177.5 0.5V) from external power supply to
KR. (Fig. 3-2)
4. Turn red of G2 VR clockwise, then retrace line appear.
5. Turn G2 VR counter clockwise and set retrace line just
disappear. (Fig. 3-3)
6. Add DC voltage DC (174 0.5V) to KR.
7. Confirm if retrace can be seen.
8. Adjust green and blue at the same method.
Power
Supply
Fig. 3-2
Test signal
Fig. 3-3

SET-UP ADJUSTMENTS

FOCUS
G R
G R
+
–
Dummy Resister
3k ohm 20W
SECTION 3

3-3. BLUE OFFSET ADJUSTMENT

This adjustment item must be ending the G2 adjustment.
1. Input the HD (1080i/60Hz Black) signal into component
in terminal.
2. Set PICTURE 100%, others are normal,
DRC 1250/60Hz.
3. Adjust with SLN so that the blue reference pulse peak
voltage of B terminal (CN1504) enters into standard.
GND (0V)
Item: DE F2 03 SLN
4. Write the adjustment value in the NVM area of
widezoom mode after the adjustment.

3-4. FOCUS ROUGH ADJUSTMENT

1. Connect VIDEO-1 terminal.
2. Receive video dot hatch pattern.
3. Use lens-cover to red and blue.
4. Adjust electric focus. (roughly)
5. Rotate the green lens and adjust to obtain the best lens
focus.
6. Rotate the green focus volume on the focus pack and
adjust to obtain best electrical focus.
7. If focus is not good, repeat 4 process.
8. Repeat above process for red and blue lenses and
electric focus.
9. Fix lens screw.
Lens
Fig. 3-4
– 11 –
KP-FR43M31/FR43M91
BLUE REFERENCE PULSE
(UG board CN1504 B5 B)
2.15
0.05V
V
Scanning line visible.
A
Minimize both A and B.
B
Fig. 3-5
RM-GA001