Convergence Adjustment - Sharp 21F-PA330I Service Manual

CONVERGENCE ADJUSTMENT

No. Adjusting point Adjusting procedure/conditions
1 CONVERGENC
1. Receive the "Crosshatch Pattem" signal.
ADJ.
2. Using the remote controller, call NORMAL mode.
(To be done
after the purity
Static convergence
adjustment.
1. Turn the 4-pole magnet to a proper opening angle
in order to superpose the blue and red colours.
2. Turn the 6-pole magnet to a proper opening angle
in order to superpose the green colour over the
blue and red colours.
Dynamic convergence
1. Adjust the convergenc on the fringes of the screen
in the following steps.
a) Fig. a: Driver the wedge at point "a" and swing
the deflection coil upward.
b) Fig. b: Drive the wedge at point "b" and "c" and
swing the deflection coil downmard.
c) Fig: c: Drive the the "c" wedge deeper and swing
the deflection coil rightward.
d) Fig. d: Drive the "b" wedge deeper and swing
the deflection coil leftward.
2. Fix all the wedges on the CRT and apply glass
tape over them.
3. Apply lacquer to the deflection yoke lock screw,
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.
4-pole magnet
6-pole magnet
Lacquer
Purity magnet
Wavefrom and others
BGR
B
G
R
Fig. a
RGB
R
G
B
Fig. b
RGB
B
G
R
Fig. c
BGR
R
G
B
Fig. d
Wedge "a"
CRT neck
About About
100Deg 100Deg
Lacquer
20mm
Wedge Wedge
"c"
"b"
9-1
H-VCO, VIF-VCO & S-TRAP for ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions
1 H-VCO ADJ (MANUAL ADJ)
(I2C BUS In No signal (RASTER) condition.
1.
CONTROL) Go to service mode, choose service data V03.
2.
(AUTO & Connect oscilloscope to IC801 pin11, adj V03 until
3.
+ _
MANUAL ADJ) freq become 15.625 0.15 KHz
(AUTO ADJ)
In No signal (RASTER) condition.
1.
Go to service mode.
2.
Choose service data V03, by pressing R/C Auto
3.
(Hex C1) key, OSD will appear "OK" at screen.
If appear "NG" pls repeat step 3.
4.
2 VIF-VCO ADJ (MANUAL ADJ)
(I2C BUS In No signal (RASTER) condition.
1.
CONTROL)
2. Go to service mode, choose service data V02.
(AUTO &
3. Connect oscilloscope to IC801 pin2, adj V02 until
+ _
MANUAL ADJ)
voltage become 2.5 1V.
(AUTO ADJ)
1. In No signal (RASTER) condition.
2. Go to service mode, choose service data V02.
3. Press the R/C Auto (Hex C1) key, OSD will appear
"OK" at screen.
4. If appear "NG" pls repeat step 3.
3 S-TRAP fo (Manual ADJ)
ADJ 1. In No signal (RASTER) condition.
(I2C BUS 2. Go to service mode, choose service data V21.
CONTROL) Connect oscilloscope to TP 801, adj V21 until
3.
(AUTO & voltage become Min (below 5 V).
MANUAL ADJ) After that pls adj service data V20 & V24 same as
4.
"V21", V22 to "V21-1", V23 to V21+2".
(Auto Adj)
In No signal (RASTER) condition.
1.
Go to service mode, choose service data V21.
2.
Press the R/C Auto (Hex C1) key, OSD will appear
3.
"OK" at screen.
If appear "NG" pls repeat step 3.
4.
Wavefrom and others
This adjustment must be done
after aging at least 3 minutes.
9-2