Set-Up Adjustments; Screen Voltage Adjustment (Rough Alignment); Screen (G2) Adjustment; Deflection Yoke Tilt Adjustment - Sony KDP-57XBR2 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.
R
SCREEN
R
FOCUS
Focus Pack
Fig. 3-1

3-2. SCREEN (G2) ADJUSTMENT

Fine Mode is recommended to set screen controls to their opti-
mal condition. It is necessary to build the simple jig, illustrated
below, using 3-watt resistors. Please note, that if the proper volt-
age is not obtained with their listed values, resistors, then please
increase or decrease one of the values in the resistor network to
obtain the correct voltage.
1. Select VIDEO1 mode without signals.
2. Connect G2 JIG to TP3802 (200V) of CG board and GND.
3. SW on JIG.
4. Connect an oscilloscope to the SG3701(KR), SG3801(KG)
and SG3901(KB) of CR board, CG board and CB board.
5. Adjust R, G and B screen voltage to 175 ± 1V with screen
VR on the focus pack.
G2 JIG
3.3k
TO CG BOARD
TP3802
(200V)
175 ± 1V
GND
Fig. 3-2
SECTION 3

SET-UP ADJUSTMENTS

G B
G B
KR, KG, KB
SW
5.6k 5.6k 5.6k
GND
All resistors are 3W type
pedestal level

3-3. DEFLECTION YOKE TILT ADJUSTMENT

1. Connect the color bar generator monoscope pattern to
VIDEO1 input.
2. Cover the both red and blue picture lenses with the lens caps
to show only the green color.
3. 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.
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 is aligned in the mode
Cover the both green and blue picture lenses with the lens
caps and the tilt of the deflection yoke for blue is aligned
with in the mode Cover the both green and red picture lenses
with the lens caps is aligned the same as was done for green.
Note: Instead of items 2 and 5, you can cut off the unnecessary
color beams by controlling the service mode "1 RGBS" of
"2150P-2".
2-pole magnet
Centering magnet
– 18 –
KDP-57XBR2/65XBR2
K
4-pole magnet
Deflection yoke
Anode cap
Fig. 3-3
RM-Y185