Toshiba 50H81 Series, Service Manual

Page: 6 / 66

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GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
WARNING : BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRE-
CAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.
PICTURE TUBE COMPONENTS ADJUSTMENT
DESCRIPTION OF NECK COMPONENTS
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Deflection yoke and convergence yoke
The position on the neck is required most front (CRT
funnel side) and the screw is fastened after rotating
yoke adjusting picture tilt.
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Centering magnet
After adjusting picture tilt, picture position is finally
fixed by this magnet.
In order to get maximum margin of user convergence
control for center of screen, this magnet have to be
used for center convergence adjustment.
PREPARATION
Operate the receiver for at least 5 minutes.
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R, G, B FOCUS ADJUSTMENT
1. Before adjusting the R, G, B FOCUS, remove the 4 screws
of Lens Assembly which is fixed on the CRT Assembly.
(See page 4.)
Then turn around the Lens Assembly by 180˚ to adjust
the fastening screw (Fig. a) and fasten the 4 screws to
secure Lens Assembly.
2. Select the adjustment mode. (See page 9.)
3. Press “7” button to display the built-in cross-hatch.
4. Press “0” and “RTN” buttons to make the picture a single
Red color.
100 button ............... to erase Red color
0 button ............... to erase Green color
CH RTN button ............... to erase Blue color
5. Loosen the fasten screw and adjust Red lense focus to
best focusing point of picture center. Then fasten the screw.
(See Fig. a.)
Fig. a
6. Adjust FOCUS VR “R” of FOCUS PACK to find best fo-
cusing point of picture center.
7. Repeat steps 3 to 5 for Green and Blue colors.
TILT ADJUSTMENT
Rotate R, G, B deflection yoke so that picture becomes hori-
zon, then fasten screw.
CENTERING ADJUSTMENT
1. Stretch a thread between two center of screen edge (top
and bottom, left and right).
2. Select the adjustment mode.
3. Press TV/VIDEO button on the Remote Control to display
the white cross-bar.
4. Perform VCEN adjustment. (See page 11.)
5. Adjust G centering magnet so that the cross-bar pattern
center comes to screen center.
6. Perform HEIGHT adjustment . (See page 12.)
7. Perform VERT. LINEARITY adjustment.
8. Perform WIDTH adjustment. (See page 11.)
9. Check whole quality of green line.
10. Adjust R, B centering magnet so that the cross-bar pat-
tern center comes to screen center.