Toshiba 50H81 Service Manual - Page 6

Picture Tube Components Adjustment - service mode

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GENERAL ADJUSTMENTS SPECIFIC INFORMATIONS WARNING : BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON PAGE 3 OF THIS MANUAL. PICTURE TUBE COMPONENTS ADJUSTMENT DESCRIPTION OF NECK COMPONENTS TILT ADJUSTMENT Rotate R, G, B deflection yoke so that picture becomes horizon, then fasten screw. CENTERING ADJUSTMENT 1. Stretch a thread between two center of screen edge (top and bottom, left and right). ᕃ ᕄ ᕃ 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. ᕄ 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. 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.) 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. 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. - 6 -

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– 6 –
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
±
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.
²
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.
±
²
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.