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Section 2: Set-up Adjustments; Screen Voltage Adjustment (coarse Adjustment); Screen (g2) Adjustment(fine Adjustment); Deflection Yoke Tilt Adjustment - Sony KP-46WT500 Service Manual

Color rear video projector.
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2-1. SCREEN VOLTAGE ADJUSTMENT
(COARSE ADJUSTMENT)
1. Receive the Monoscope signal..
2. Set BRIGHTNESS to 50% and PICTURE to minimum.
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 retrace line is barely visible.
4. Gradually turn the control to the left until the retrace line disappears.
R
SCREEN
R
FOCUS
FOCUS Block
2-2. SCREEN (G2) ADJUSTMENT
(FINE ADJUSTMENT)
If the jig described below is available, it is recommended that the G2
Fine Mode Adjustment be performed to set the screen controls to their
optimal condition. If desired, you can build the jig illustrated below,
using 3-watt resistors. Please note that if the proper voltage is not
obtained with the listed resistor's values, then increase or decrease one
of the values in the resistor network to obtain the correct voltage.
1. Select VIDEO-1 mode no signal applied (the screen must be black).
2. Connect the G2 JIG.
3. SW on JIG.
4. Connect an oscilloscope to the TP7101(KR), TP7202(KG) and
TP7301(KB) of CR board, CG board, and CB board.
5. Adjust red, green, and blue screen voltage to 177.5+/-0.5V with screen
VR on the focus block.
G2 JIG
TO CG BOARD
3.3k
TP7202
(210V)
177.5V +/- 0.5V
GND

SECTION 2: SET-UP ADJUSTMENTS

G
B
G
B
K
SW
3.9k
5.6k
6.8k
GND
All resistors are 3W type
pedestal level

2-3. DEFLECTION YOKE TILT ADJUSTMENT

1. Connect the color bar generator monoscope pattern to Video 1 input.
2. Cover the red and blue CRT lenses with lens caps to allow only green
to show (or use the method shown in the note below for turning off the
CRTs individually without using lens caps).
3. Loosen the CRT's deflection yoke set screw and align the tilt of
the deflection yoke so that the horizontal 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.
The tilt of the deflection yoke is aligned in the mode.
5. Cover the green and blue CRT lenses with lens caps to allow only
green to show (or use the method shown in the note below for turning
off the CRTs individually without using lens caps), then repeat steps
3 and 4 for the red CRT.
Cover the green and red CRT lenses with lens caps to allow only
green to show (or use the method shown in the note below for turning
off the CRTs individually without using lens caps), then repeat steps
3 and 4 for the blue CRT.
Note: If lens caps are unavailable, you can cut off the unnecessary color
beams by controlling the service mode 2150P-2 1 RGBS.
2-pole magnet
Centering magnet
— 15 —
4-pole magnet
Deflection yoke
Anode cap
KP-46WT500

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