Set-Up Adjustment - Toshiba 28Z33B Service Manual

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRE-
CAUTION" AND "PRODUCT SAFETY NOTICE" ON PAGE 3 OF THIS MANUAL.
The following adjustments should be made when a complete realignment is required or a new picture tube is installed.
Perform the adjustments in order as follows :
1. Color Purity
2. Convergence
3. White Balance
Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.
Refer to figure 1.
Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference
to the position depend on a kind of tube.
There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)
*
COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the re-
ceiver should be operated for at least fifteen minutes.
1. Demagnetize the picture tube and cabinet using a de-
gaussing coil.
2. Set the brightness and contrast to maximum.
3. Use a green raster from among the built-in test signals.
4. Loosen the clamp screw holding the yoke and slide the
yoke backward or forward to provide vertical green belt
(zone) in the picture screen.
DEFLECTION
YOKE
GLASS CLOTH
TAPES

SET-UP ADJUSTMENT

5. Remove the Rubber Wedges.
6. Rotate and spread the tabs of the purity magnet (See
7. Slowly move the yoke forward or backward until a uniform
8. Check the purity of the red and blue raster.
20mm(28", 32")
25mm(25")
19mm(19", 20", 21")
14mm(13", 14")
PURITY/
CONVERGENCE
MAGNET ASS'Y
Figure 1.
– 4 –
figure 2.) around the neck of the picture tube until the
green belt is in the center of the screen. At the same
time, enter the raster vertically.
green screen is obtained. Tighten the clamp screw of
the yoke temporarily.
TEMPORARY
MOUNTING
(Put on after
adjustment)
DEFLECTION
YOKE
RUBBER WEDGE
ADHESIVE