5
4. Adjustment methods
4.1 B+ voltage adjustment
a. Be sure the voltage AC 120V/60Hz.
b. Connect the digital voltmeter to TP3 and GND of B+ test point, input the US-7 signal, set the
picture control to “standard”, adjust RP501 to let the B+(test point) voltage 140V+/-0.3V
c. In the STAND BY turn off, B+ voltage about 20V
4.2 OSD position adjustment
In the factory menu, select SYS SETTING sub menu, adjust OSD H-POS item, let the character
position to screen display center.
4.3 AFT adjustment
a. IF of tuner (TUNER101) output and TP6 are separate.
b. Input 45.75MHz of frequency and 90db of amplitude signals to TP6
c. Adjust the tunable inductance L110, and measure between the TP4 and GND voltage, until the
TP4 voltage to be 2.5V.
d. Output pin IF of TUNER101 and TP6 bonding pad is normal.
4.4 AGC voltage adjustment
a. Receive 60db split field signal
b. Adjust the potentiometer RP101, and measure the TP5 to GND voltage, until the voltage of TP5
to be 3.5V, then noise wave of the picture point disappears.
4.5 focus adjustment
a. Receive A28 signal, set the picture mode to standard.
b. Adjust focus potentiometer of FBT, until the B area display best.
4.6 Screen-grid voltage and white balance adjustment
a. Receive US-7 split field signal, the picture mode to “warm”.
b. In the factory menu, select the WHITE BALANCE SETTING menu, fixed the CUT OFF R and
adjust the CUT OFF G and the CUT OFF B, until the white balance is normal.
c. Select the color and contrast to 0, select the brightness to 50 in the user menu. In the factory
menu, select the LUMINANCE SETTING menu; adjust the Brightness min, until the back level
voltage about 180V. Adjust the SCREEN potentiometer, until rightmost of gray of the US-7
picture up and down separate.
d. Select the color to 0, the brightness to 50 and the contrast to 100 in the user menu, adjust the
Contrast max, until the eight level gray amplitude Vp-p to 100V.
e. Select the color to 0, the brightness and the contrast to 100 in the user menu, adjust the
BRIGHTNESS max, until low right back color of the D-8 picture does not white.
f. In the factory menu, select the WHITE BALANCE SETTING sub menu; adjust the white balance
(color temperature to /-8MPCD, the color coordinate to 0.270+/-0.008, 0.283+/-0.008).
4.7 Horizontal and vertical scanning centre adjustment of TV
4.7.1 Horizontal center adjustment
Receive A6 signal, the picture mode to “STANDARD” in the factory menu, select Horizontal
setting menu, adjust the H POS, until the picture H-center and screen center accord.
4.7.2 Vertical center adjustment
Receive A6 signal, the picture mode to “STANDARD” in the factory menu, select Vertical
setting menu, adjust the V POS, until the picture V-center and screen center accord.
4.8 Vertical scanning adjustment
Receive A12 signal, the picture mode to “STANDARD” in the factory menu, select Vertical setting
Summary of Contents for IS-TVHD30
Page 1: ...COLOR TELEVISION IS TVHD30 ...
Page 10: ...8 APPX horizontal and vertical scanning adjustment diagram ...
Page 11: ...9 ...
Page 19: ...17 6 LA72700V 5 SIF input 25 R output 11 SDA 26 L output 12 SCL 31 9V ...
Page 20: ...18 Wiring diagram ...
Page 23: ...21 Schematic diagram ...
Page 24: ......
Page 25: ......
Page 32: ...603 TJ3060 01 Ver 1 0 603 TJ27780 01 603 TJ27680 01 ...