SHARP CX68K5
Service Manual

CX68K5 SX68K7

CONVERGENT VIDEO LEVEL ADJUSTMENT CHECKING

NO POINT ADJUSTMENT CONDITION / PROCEDURE WAVEFORM OR OTHERS VIDEO DET B/G -PAL Color bar (100% white bar) is 1 CONVERGENCE (1) Receive the "Crosshatch Pattern" signal. B G R
G

LEVEL received ADJUSTMENT (2) Using the remote controller, call NORMAL ADJUSTMENT (2) Adust R476 to make video output of the (To be done after mode. B R476 AV-OUT terminal become 1.0 ± 0.05 Vp-p at the purity R

the 75� terminator. adjustment.)

(Static convergence) (1) Turn the 4 pole magnet to a proper opening angle in order to superpose the blue and red
R G B colours.

Fig. a

(2) Turn the 6 pole magnet to a proper opening angle in order to superpose the green colour G over the blue and red colours. B

R

B

(Dynamic convergence) Fig. b (1) Adjust convergence on fringes of the R G B screen in the following steps. G a) Fig. a: R Drive wedge at point "a" and swing the

PURITY ADJUSTMENT

NO POINT ADJUSTMENT CONDITION / PROCEDURE WAVEFORM OR OTHERS deflection coil upward. 1 PURITY
a b

ADJUSTMENT beam current to 1,400µA Drive the wedge at point "b" "c" and B G R R

c b) Fig. b: (1) Receive GREEN -ONLY signal. Adjust the

(2) Degauss CRT enough with the degausing G

swing the deflection coil downward.

coil. c) Fig. c: B NOTE: Follow the Job Instruction Sheet to Drive "c" wedge deeper and swing the 90mm 1-1 d) d: Fig. d Vertical Bv: Refer to the factory

adjust the magnetic field. deflection coil rightward.

A tape over them. magnetic field and keep the static

(2) Fix all wedges on the CRT and apply glass (3) Maintain purity magnet at the zero screw, magnet unit (purity, 4 pole, 6 pole
A=B (3) Apply lacquer to the deflection yoke lock convergence roughly adjusted.

Drive "b" wedge deeper and swing the Horizontal Bh: setting page. (Reference: page 11)

Wedge "a" deflection coil leftward.

8
will change to RGB mono colour mode. GREEN BLUE RED

About

100 Deg. (4) Observe the points a, b, as shown in Fig.1 1 100 Deg.

B About
Lacquer

Fig. 1-2 Rank A (On the right of CRT)

Wedge "b"

through microscope. Adjust the landings to magnets) and magnet unit lock screw. Finally received the Red and Blue only A rank requirement. signals to make sure there is no other colours (5) Orient the raster rotation to 0 eastward. on the screen. (6) Tighten up the deflection coil screws.
6-Pole Magnet. CRT NECK

Wedge "c"

Tightening torque : 108N 20N (11Kgf ± 2Kgf)

A

(7) Make sure CRT corners landing meet the

A rank requirements. If not, stick the magnet A=B sheet to correct it. B Note : This adjustment must be done after

26mm ± 0.5mm warming up the unit for 30 minutes or

Fig. 1-3 Rank A (On the left of CRT) longer with a beam current over Lacquer Purity Magnet 1,400µA. 4-Pole Magnet

*For the following colours press to *Press R/C RGB key for 1 second change. in NORMAL MODE, the colour

ONLY

Signal-colour

8-1 8-2