SHARP 21GT-22 Repair Manual

21GT-22
!
B G RR G BAbout 100Wedge "c"
RGBBGR
BGRFig. aRGBFig. bFig. cFig. dWedge "a"
B G RR G B!Lacquer
About 100Wedge "b"
20mm
CRT neck7-2
6-pole magnet
Lacquer
4-pole magnet
swing the deflection coil upward.and swing the deflection coil downward.swing the deflection coil rightward.swing the deflection coil leftward.
mode.angle in order to superpose the blue and red colours.angle in order to superpose the green colour over the blue and red colours.screen in the following steps. a)Fig. a : Drive the wedge at point "a" andb)Fig. b : Drive the wedge at point "b" and "c"c)Fig. c : Drive the "c" wedge deeper andd)Fig. d : Drive the "b" wedge deeper andtape over them.magnet unit (purity, 4-pole, 6-pole magnets) and magnet unit lock screw.Finally received the Red-only and Blue-only signals to make sure there is no other colours on the screen.
CONVERGENCE ADJUSTMENTPurity magnet
1.Receive the "Crosshatch Pattern" signal. 2.Using the remote controller, call NORMALStatic convergence 1.Turn the 4-pole magnet to a proper opening2.Turn the 6-pole magnet to a proper openingDynamic convergence 1.Adjust the convergence on the fringes of the2.Fix all the wedges on the CRT and apply glass3.Apply lacquer to the deflection yoke lock screw,
ADJ. (To be done after the purity adjustment.)
1CONVERGENCE
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
bA = BA = B
ABAB
Fig. 1-1Fig. 1-2Rank "A" Fig. 1-3Rank "A"
a
(on the right of the CRT)(on the left of the CRT)
ond in NORMAL MODE, the col- our will change to RGB mono colour mode.
*Press R/C RGB key for 1 sec-
A.
m
Fig. 1-1
Red-only
20 N
?7-1
A.
m
Blue-only
Signal-colour screen cleared
2 kgf)
?
PURITY ADJUSTMENT
warming up the unit for 30 minutes or longer with a beam current over 700
Tightening torque: 108N (11kgf
beam current to ~ 700 coil.netic field and keep the static convergence roughly adjusted.through the microscope. Adjust the landings to A rank requirement.EA rank requirements. If not, stick the magnet sheet to correct it.Green-only
change.
1.Receive the GREEN-ONLY signal. Adjust the2.Degauss the CRT enough with the degausing3.Maintain the purity magnet at the zero mag-4.Observe the points a, b, as shown in 5.Orient the raster rotation to 0 eastward. 6.Tighten up the deflection coil screws.7.Make sure the CRT corners landing meet the Note:This adjustment must be done after*For the following colours press R/C RGB key to
PURITY ADJ.
1
NO.Adjustment partAdjusting procedure and conditionsWaveform and others
7