XOCECO NXT1333, Руководство по обслуживанию

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3
3 TEST EQUIPMENT
3.1 AUDIO VOLTAMETER
3.2 OSCILLOGRAPH
3.3 HIGH-VOLTAMETER
3.4 DIGITAL MULTIMETER
3.5 AC ATTACK PULL TEST EQUIPMENT
3.6 SCAN frequency signal generator BT-3
4 Debugging instruction
4.1 enter into the factory debugging menu
use to the remote control(RC-A23),follow to the blow model enter into the factory:
DISPLAY
→
MUTE
→
MUTE
→
MUTE
→
enter into the factory
press “sleep” button for pages upward, press “return” button for pages downward, press “CH+/-” to
select alignment items and “VOL+/-” to adjust volume, press “MUTE” to exit.
If the remote sensor designed for alignment is unavailable, press the following buttons to enter by
using user remote sensor
4.2 B+ voltage adjustment
Check B+ voltage ( negative pole of VD509) by using DC voltmeter DC 200V
14”110 V±1 V CRT 21”PF 100 V CRT A15QDX992X002(H)
21”110 V±1 V CRT 54SX503Y22-CD01 A51LVV898X12
4.3 AGC adjustment
Measure the voltage of RF AGC by connecting digital DC voltmeter with TP1, receive weak signal
(40dBu) and the static AGC voltage of TP1 AGC should be V1=4V±0.2V; the receive medium signal
(60dBu), adjust the value of PAGE8 RF. AGC of factory menu and the start-control voltage of TP1 AGC
should be V2=3.5V±0.2.if V2>3.5V, then the voltage is -1 or -2,if V2<3.5V, then the voltage is+1 or+2.
after adjustment the picture should not appear no-sync , distortion and moire.
White balance and screen-grid voltage VG2 adjustment
After enter PAGE3 of factory menu, use remote sensor directly to adjust white balance by pressing the
following digital buttons:
“1”=R.BIAS(+) “2”=G.BIAS(+) “3”=B.BIAS(+)
“4”=R.BIAS(-) “5”=G.BIAS(-) “6”=B.BIAS(-)
press “pp” button to select picture mode
→ T1 → T2 → bright → soft → nature → user → the current picture
mode will be display on the screen.
The T1 mode has the maximum value of brightness and contrast with all the other items min. Value of all
the analog are minimum while in T2 mode.
Before adjustment you should set the following items :SUB-BRIGHT=50, R.B=100, G.B=100,
B.B=100, R.D=100, G.D=15, B.D=100
Adjustment method: 1. press PP button to select T2 picture mode, press CH+/- to select V.K, press vol+
to let the field scanning fail to oscillate, adjust the screen-grid potentiometer on FBT clockwise to let
horizontal bright line just appear on the screen; let the value of G.B unchanged, adjust R-BIAS and
B-BIAS to let the horizontal bright line appear white. If the green horizontal line don’t appear firstly,
fine-turn the screen-grid voltage, the adjust R.B and B.B until red , green and blue just appear. After
adjustment press VOL- to obtain normal field scanning mode.
4.4
Receive grey-scale signal (D8), enter PAGE4 of factory menu, press PP to select T2 picture mode,