2
3.1 Debugging item
a)adjust mode instruction
b)B+ voltage adjustment
c)RFAGC voltage adjustment
d)focus adjustment
e)Screen-grid voltage white balance, sub brightness adjustment
f)filed scan center, line , amplitude adjustment
g)H-scan center adjustment
3.2 Alignment flow
3.3 Enter/exit factory adjustment method
Use remote control, press “MENU” button, then press 6483,”M”will appear on screen to show that you
have entered the factory adjustment method, press “STANDBY” to exit it.
3.4 Select adjustment item and adjust data
After entering factory adjustment mode, press 1-4 number buttons to select menu1- menu4; To enter into
MENU0~MENU5, press “CHILD LOCK” button and then the number button (5~0) to enter into relative
menus. Press “P+” and “P-” to select and “V+” and “V-”to adjust.
4 Alignment method
4.1 B+ voltage adjustment
a) connect B+ point with a digital voltmeter to measure the negative pole of VD524
b) receive PHILIPS test pattern signal and set the picture to standard.
c) Adjust VR501 to let the value of B+ voltage be 135 V
±
0.5 V (yongxin super pure flat)
4.2 AGC adjustment
a) receive VHF-H band,60 dB RF signal.
b) Select factory menu2 of “AGC”.
c) Press “V+”,”V-”to let voltage value of tuner pin AGC be 3.8 V
±
0.1 V(DC).(if the selected tuner
is changed, then the voltage of AGC should be measured again: receive VHF-H band and 60
dB RF signal, adjust AGC-TOP to let the picture just without noisy, then the voltage of tuner
AGC is the required value for adjustment.)
d) exit factory menu
4.3 Normal temperature aging
a) do not receive signals.
Fig-1 alignment flow
Normal
temperature aging
+B adjustment
Focus adjustment
White balance
adjustment
Picture adjustment
AGC adjustment
