Sharp SX80J9 Service Manual page 9

CONVERGENCE ADJUSTMENT
(To be done after the purity adjustment)
R G B
B G R
B
G
R
Fig. a Fig. b
R G B
B G R
B
R
G G
R B
Fig. c Fig. d
Wedge "a"
About 100°
About 100°
Lacquer
Wedge "b" Wedge "c"
4-pole magnet
6-pole magnet
CRT neck
Lacquer
Purity magnet
1. Receive the E-2CH "CROSSHATCH PATTERN" sig-
nal.
2. Using the remote controller, call the Normal mode.
R
G
STATIC CONVERGENCE
B
1. Turn the 4-pole magnet to a proper opening angle in
order to superimpose the blue and red colours.
2. Turn the 6-pole magnet to a proper opening angle in
order to superimpose the green colour over the blue
and red ones.
DYNAMIC CONVERGENCE
1. Adjust the convergence on the fringes of the screen in
the folloeing steps.
a) Fig. a: Drive the wedge at point "a" and swing the
deflection coil upward.
b) Fig. b: Drive the wedge at points "b" and "c" and
swing the deflection coil downward.
c) Fig. c: Drive the "c"wedge deeper and swing the de-
flection coil rightward.
d) Fig. d: Drive the "b"wedge deeper and swing the de-
flection 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, mag-
net unit (purity, 4-pole and 6-pole magnets) and mag-
net unit lock screw.
9-1
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST
ADJUSTMENT
1. CRT CUT-OFF ADJUSTMENTS
Adjusting Point
Sub-Brightness: R890
1. Receive E-5CH "MONOSCOPE PATTERN" sig-
nal.
2. Using the remote controller, call up the Video Nor-
mal mode.
3. Go to the service mode (Make short-circuit be-
tween TP1001 and TP1002.) and select the cut-
off/background mode.
4. Connect the oscilloscope to TP852 (RED cathode).
5. Set the screen control to 0/10 position.
6. Press the "•/••" key on the remote controller to reach the horizontal centering mode.
7. Adjust the sub-brightness control (R890) so that the blanking pulse on the oscilloscope screen be
10 ± 1Vp-p.
8. Disconnect the oscilloscope from TP852.
9. Turn the screen control counterclockwise until the horizontal raster glimmers.
10.Adjust the cut-off data of the other two colours until the horizontal raster becomes whitish.
Note: The data can be turned up and down with the above keys.
• R CUT OFF UP "1" key • G CUT OFF DOWN "5" key
• R CUT OFF DOWN "4" key • B CUT OFF UP "3" key
• G CUT OFF UP "2" key • B CUT OFF DOWN "6" key
11.Turn the screen control counterclockwise until the horizontal raster disappears.
Note: Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of
1900 ± 50µA.
12.Press the "•/••" key on the remote controller to call the normal mode.
2. WHITE BALANCE and BACKGROUND (I
1. Receive the E-5CH "MONOSCOPE PATTERN" signal.
2. Using the remote controller, call the Video Normal mode.
3. Connect the ammeter between TP601 and TP602.
4. Roughly adjust R1631 (Max beam adjustment) to have a beam current of about 1.9 mA.
5. Receive the J-12CH (window pattern) signal. (Or receive the white balance pattern signal.)
6. Adjust the G-drive and B-drive data to have a colour temperature of 12,300°K. (white).
•12,300°K. X: 0.272
Y: 0.275
(with a Minolta colour temperture meter CA-100)
Note: The data can be turned up and down with the above keys.
• G-DRIVE UP "7" key • B-DRIVE UP "8" key
• G-DRIVE DOWN " " key • B-DRIVE DOWN "0" key
7. Using the R-CUT OFF, G-CUT OFF, and B-CUT OFF controls, adjust the white/dark portion to 12,300°K.
8. Readjust the color temperature at the white peak.
9. Check the white/dark portion to make sure the colour temperature is 12,300°K.
Note: Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of
1900 ± 50µA.
10 ± 1Vp-p
2
C bus adjustment)
9-2