20GT-30
21GT-30
TREBLE: CENTER BASS: CENTER SURROUND: OFF SURROUND LEVER: CENTER BALANCE: CENTER
the CONTRAST effect is OK or not.the COLOUR effect is OK or not.the BRIGHTNESS effect is OK or not.in.UP for GREEN direction and DOWN for PURPLE direction whether is OK or not.the SHARPNESS effect is OK or not.channel number in green colour under AFT ON condition.NORMAL key is pressed, all the settings will be present to normal setting.(Normal setting value for every mode).CONTRAST: MAX COLOUR: CENTER BRIGHTNESS: CENTER TINT: CENTER SHARPNESS: CENTERTEMP Option, STANDARD: NORMAL SETTING, WARM for more REDDISH direction changing, COOL for more BLUISH direction changing.press the COLOUR SYSTEM key to select modes except PAL, check the COLOUR is not working properly. Then, select the "PAL" mode. Check again its colour so that it is working properly.signal thru AV, select COLOUR SYSTEM key to select modes except N4.43/3.58, check the COLOUR is not working properly. Then, select the "NTSC 4.43/3.58" mode. Check again its colour so that it is working properly.
ADJUSTMENT CONDITION / PROCEDUREWAVEFORM OR OTHERS
(1)Receive "Monoscope Pattern" signal. (2)Set PICTURE MENU to select CONTRAST. (3)Press Volume Up/Down key to check whether (2)Set PICTURE MENU to select COLOUR. (3)Press Volume Up/Down key to check whether (1)Receive "Monoscope Pattern" signal. (2)Set PICTURE MENU to select BRIGHTNESS. (3)Press Volume Up/Down key to check whether (2)Set PICTURE MENU to select TINT. (3)Press Volume Up/Down key to check TINT, (1)Receive "Monoscope Pattern" signal. (2)Set PICTURE MENU to select SHARPNESS. (3)Press Volume Up/Down key to check whether (1)All Ch (1~99) will have an OSD display of the (2)Set PICTURE MENU to select WHITE TEMP. (3)Press Volume Up/Down key to check WHITE (1)Receive the "PAL COLOUR BAR" signal, (2)Receive "NTSC 4.43/3.58 COLOUR BAR"
ADJUSTMENT POINTCONTRAST KeyCOLOUR Key(1)Receive "Color Bar" signal.BRIGHTNESS KeyTINT Key(1)Receive the "NTSC Colour Bar" signal thru AV SHARPNESS KeyCH DISPLAY COLOURNORMAL Key(1)Once in PICTURE/SOUND MENU, and the WHITE TEMP(1)Receive "Monoscope Pattern" signal.COLOUR SYSTEM
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FUNCTION OPERATION CHECKING (1) (VIDEO & AUDIO)NO
Fig. 1-1
W Y Cy G Mg R B
(B-Y)
each short test.
SAME LEVEL*Select one of Q883/5/7 to do
3 dB)
?
sec/Div
?
3 dB)
?
thru AV in.BLUE-OUT. Range : 1V/Div (AC) (Use Probe 10:1) Sweep time: 10Adjust the "SUB-TINT" bus data to obtain the waveform shown as Fig. 1-1.short, make sure the protector ON and switch to standby mode.(R606 side).sure the protector is not work.sure the protector functions.short testing in + B line, check all possible damaged components on +B line. (Use random selected set for inspection) White Color Bar, Sound 400 Hz 100% Mod).impedance. Make sure the output is as specified (1.0 Vp-p impedance. Make sure the O/P is as specified (1.76 Vp-p controller, make sure that the modes change in order of TV, AV1, AV2 & TV again and the video & audio output are according to the input terminal for each mode.
ADJUSTMENT CONDITION / PROCEDUREWAVEFORM OR OTHERSADJUSTMENT CONDITION / PROCEDUREWAVEFORM OR OTHERSADJUSTMENT CONDITION / PROCEDUREWAVEFORM OR OTHERS
(1)Receive the "NTSC 3.58 Color Bar" signal (2)Connect the oscilloscope to TP853 (P882 pin5) (3) Call the "SUB-TINT" mode in service mode. (4)Clear the SERVICE mode. (1)Receive "Monoscope Pattern" signal. (2)Set CONTRAST MAX. (3)Set BRIGHT MAX. (4)During the Collector & Emitter of Q883/5/7 (1)Receive "Monoscope Pattern" signal. (2)Connect output of Bias Box to D607 cathode (3)Set voltage of Bias Box to 18V and make (4)Set voltage of Bias Box to 27V, and make (1)Once finish rectified Electrolytic Capacitor (1)Receive the "PAL Color Bar" signal (100% (2)Terminate the Video output with a 75 ohm (3)Terminate the Audio output with a 10 Kohm (1)Using the TV/VIDEO key on the remote
NTSC CHROMA ADJUSTMENT
A/V INPUT AND OUTPUT CHECKING
PROTECTOR OPERATION CHECKING
ADJUSTMENT POINTSUB-TINT (I2C BUS CONTROL)ADJUSTMENT POINTBEAM PROTECTORH, V PROTECTOROTHER PROTECTORADJUSTMENT POINTVIDEO AND AUDIO OUTPUT CHECKVIDEO AND AUDIO INPUT CHECK
112312
NONONO
11 |
ACEC
