Elekta CTR1498 Manuale - Pagina 6

Sfoglia online o scarica il pdf Manuale per TV Elekta CTR1498. Elekta CTR1498 11.

1. AUTOMATIC DEGAUSSING

An automatic degaussing coil is attached around the picture tube, degaussing the tube property in about one second after the set is

switched on. If the receiver is moved or faced in a different direction, the power must be switched off at least 15 minutes in order that

the automatic degaussing circuit operates property. External degaussing is necessary íf Use automatic degaussing proves ineffective

offer the set is moved. External degaussing is done by moving a degaussing coil circlewise in front of the face plate and then moving it

away step by step until it is about two meters from the screen, then switch off the degaussing coil If residual color spots are still found

on the screen, adjust the color purity and convergence.

B + ( 110V ) ADJUSTMENT

CAUTION: To avoid X-ray hazards, B + voltage must be set correctly at + 110V position.

(a) Make sure the AC power supply is 220V, 50Hz

(b) Switch on the TV receiver tune in an active channel and adjust brightness, color and contrast for maximum

(d) Adjust VR501 on Power Supply PCB for B + 110V voltage reading.

3. HIGH VOLTAGE CHECK

CAUTION: There is no high voltage adjustment in this chassis, B + 110V voltage directly relates to the high voltage, it must be property

adjusted to insure the correct high voltage. The high voltage must not exceed 26kV under any conditions.

(a) Connect an accurate high voltage meter to the second anode cap or the picture tube.

(b) Turn on the receiver, set brightness and contrast controls to minimum, then observe its voltage Zerobean Current )

(d) No matter whether the luminance, contrast and chrominance controls are set to maximum or minimum, the high voltage must be

kept under 24kV.

4. HORIZONTAL OSCILLATOR ADJUSTMENT

Adjust the HORIZONTAL HOLD control VR203 to the center of the pull-in range

5. VERTICAL OSCILLATOR ADJUSTMENT

If the picture moves up or down on the screen, adjust the VERTICAL HOLD control ( VR204 ).

6. HEIGHT ADJUSTMENT

(a) Receive the Philips Pattern signal.

Adjust the height control ( VR205 ) to slightly overscan the screen.

(b)

PICTURE CENTER POSITION ADJUSTMENT

If the picture is on the left or right side of the screen, adjust the HORIZONTAL CENTER control VR207 until it is satisfactory.

GENERAL ADJUSTMENT