1. B+ voltage test
a) Make sure the AC power is 120 V/60 Hz
b) Connect digital voltmeter to B+ test point, receive A-7 signal, set picture control to“MEMORY 2” state, test B+, the test voltage should be 100 V±0.3 V.
2. AGC adjustment
a) Receive 60 dB split field A-7 signal.
b) Use oscilloscope or digital voltmeter to monitor test N201 pin 43 voltage(AGC output).
c) Press R-AGC button, by making use of [←][→] button, increase the value from low to high until the voltage just reach 4.0 V, at this time picture noisy spot should basically disappear, otherwise continue fine tune R-AGC button.
3. Focus adjustment
3. 1 Receive A-12 signal, set user control to “MEMORY 2” state.
3. 2 Adjust FBT’s focus potentiometer, to make the screen’s B area’s focus optimum.
4. Acelerating electrode adjustment method (use A-7 signal)
4.1 Roughly adjust white balance, fix RCUT value, adjust GCUT,BCUT,GDRV,BDRV’s value to make white balance basically normal.
4.2 Set the color to 0, contrast to 30, use oscilloscope to adjust CRT’s red gun’s waveform (see below figure), adjust brightness to make the seventh step’s (the darkest) DC level be 180V, adjust accelerating electrode to make the seventh step slightly light up (just can separate the seventh step and below dark field).
Photo credit to www.inisdesign.com
4.3 Fine adjust white balance (color temperature: 12000K±8MPCD X=0.270±0.008 Y=0.283±0.008 )
4.4 Set contrast,brightness,color all to 0, adjust BRTN to make A-7’s upper left 2 lattice slightly light up.
5. Horizontal,vertical scan center adjustment
5.1 Item adjustment
VLIN 50Hz V-linearity adjustment
VSC 50Hz Vertical S-correction
VLIS 60Hz V-linearity adjustment
VSS 60Hz Vertical S-correction
5.2 PAL(50 Hz) H-center,V-center adjustment
Receive D35 signal, set user control to “MEMORY 2” state, fine tune V-center VP50, H-center HPOS,
to make picture’s center be in accordance with screen’s center.
5.3 NTSC(60Hz)H-center,V-center adjustment
Receive A6 signal, set user control to “MEMORY 2” state, adjust V-center VP60, H-center HPS to make picture’s center be in accordance with screen’s center.
6. Vertical scan amplitude adjustment
6.1 PAL(50 Hz)V-amplitude adjustment
Receive D35 signal, set user control to “MEMORY 2” state, adjust V-amplitude HIT, make picture’s upper and lower overscanning be screen size’s 8%.
6.2 NTSC(60 Hz)V-amplitude adjustment
Receive A 12 signal, set user control to “MEMORY 2” state, adjust V-amplitude HITS to make picture’s upper and lower overscanning be screen size’s 8%.
Checking point Advent Q2016 TV Service Menu
1. High voltage check
1.1 Connect high voltage meter to CRT’s second anode and GND.
1.2 Receive A-7 signal, set user control to “MEMORY 1” state, the high voltage should be 29.0 kV±1 kV.
1.3 When brightness and contrast be set to minimum (zero beam current), the high voltage should not exceed
2. CRT filament voltage check
Receive A-7 signal, set picture control to “MEMORY 2” state, use effective value voltmeter to test CRT
filament voltage, the reading should be (6.3±0.3)Vrms.
3. X-ray protection check
3.1 Receive A-7 signal, set user control to “MEMORY 2” state.
3.2 Short R554(TP501,TP502), X-ray protection circuit should effect.
4. Picture and sound check
4.1 Receive standard TV signal.
4.2 Making use of picture control buttons to check color,contrast,brightness,sharpness,tint’s control function.
4.3 Making use of sound control buttons to check volume control function.
5. Sub-brightness check
Receive A-7 signal, set color ,contrast,brightness all to 0, picture’s left side first grid slightly lights.
6. This set can produce 28 kinds of testing signal by itself. Press “SLEEP PIC DSP MENU AV” button,
every time you press the buttons, one kind of testing signal will be produced. The first fourteen signals
are NTSC signal and the other fourteen signals are PAL signal. After these signals are cycled for one
time, it will return to original screen.
7. Color purity and convergence check(Use common regulation)
8. AV terminals ( AV IN/OUT check)
9. Other control buttons (on the set and on the remote controller) function check.
Preset the following in factory Advent Q2016 TV Service Menu
1. Picture menu: CONTRAST 100
2. Volume preset to 30.
3. Set OSD language to English.
4. Color system preset to AUTO.
5. TV mode:channel position number 2.
6. Firstly press SHOP OUT D/K SPOUT out-factory button on the factory remote controller,
“ready” will appear, wait for 8-10 seconds, the preset will be stored.
1. Enter into factory menu to operate.
1.1 Press “SLEEP PIC DSP MENU” button(The period of two-press should be within 5 seconds), enter into factory menu.
1.2 Use MENU button to scroll the pages(P1,P2,P3).
1.3 In factory menu status, press SLEEP button to exit.