Toshiba 29CZ8URB, Service Manual

Page: 4 / 70

GENERAL ADJUSTMENTS
SPECIFIC INFORMA
TIONS
– 4 –
SET-UP ADJUSTMENT
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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.
COLOR PURITY ADJUSTMENT
(1) Let the screen face in the installing direction or toward the east (when it is to be moved), bring up the service mode screen
after demagnetizing (front, left, right, and top) with the degaussing coil, receive white signals by pressing the
a
button, and
then the receiver should be operated for more than 40 munutes.
(2) Perform rough adjustment of the central convergence with the P/C magnet according to the adjustment item.
(3) Receive built-in green signals, loosen set screws on the deflection yoke, remove rubber wedges, and shift the deflection
yoke to toward front.
(4) Move alternately the two 2-pole magnets of the P/C magnets so that the green raster can come to the center of the screen.
(5) Receive built-in red and blue signals, check that there is no inclination of the single color raster toward one side, and if each
color tilts to a great extent, make adjustment with the 2-pole magnet so that the 3 colors will come to the center evenly.
(6) Receive the green raster, shift the deflection yoke from
a foremost position (hitting against the picture tube) to
a backward position horizontally, stop the deflection
yoke at a position where it begins to become a green
raster, and perform accurate marking on the picture
tube.
(7) Shift the deflection yoke further backward, and perform
accurate marking at a position where the green raster
begins to being luck.
(8) Fix the deflection yoke at a position 60% forward within
the range marked in items (6) and (7) above.
CONVERGENCE ADJUSTMENTS
*
Adjust the convergence magnet to get vest convergence in the order to (1) ~ (5).
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CENTER CONVERGENCE:
(1) Receive the white crosshatch or dot pattern from the service signal generator.
(2) Use the 2 pieces of main 4-pole magnets of P/C magnets, change the open angle, and align the red and blue vertical lines
on the screen center.
(3) Freeze the open angle of the main 4-pole magnets, turn them simultaneously, and align the horizontal lines.
(4) Take the same steps for items (2) and (3) above and align red/blue with green on the screen center using two 6-pole
magnets.
WARNING : BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.
Figure 1.
A
P/C magnet installing position A
MAG-1108 : 37 mm
MAG-1113 : 39 mm
Green Belt
2-pole purity magnet
(27": Magnet is fixed with deflection yoke.)
6-pole convergence magnet
Sub-4-pole convergence magnet
Main 4-pole convergence magnet
Fix the deflection yoke at a position 60% forward from a
point between (6) and (7)
Picture tube
Shift deflection yoke
(6)
(8)
(7) Perform marking of each point
on the tape of picture tube
CRT-D board
P/C Mag
100 60 0%