Sharp 20GT-15, Руководство по обслуживанию

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20GT-15
10
NTSC CHROMA ADJUSTMENT
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
SUB-TINT (I2C BUS CONTROL)
(1)
Receive the "NTSC 3.58 Color Bar" signal thru AV in.
(2)
Connect the oscilloscope to TP853 (P882 pin5) BLUE-OUT. Range : 1V/Div (AC) (Use Probe 10:1) Sweep time
: 10
µ
sec/Div
(3) Call the "SUB-TINT" mode in service mode.
Adjust the "SUB-TINT" bus data to obtain the waveform shown as Fig. 1-1.
(4)
Clear the SERVICE mode.
Fig. 1-1
(B-Y)
SAME LEVEL
W Y Cy G Mg R B
PROTECTOR OPERATION CHECKING
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
BEAM PROTECTOR
(1)
Receive "Monoscope Pattern" signal.
(2)
Set CONTRAST MAX.
(3)
Set BRIGHT MAX.
(4)
During the Collector & Emitter of Q883/5/7 short, make sure the protector ON and switch to standby mode.
*
Select one of Q883/5/7 to do each short test.
2
H, V PROTECTOR
(1)
Receive "Monoscope Pattern" signal.
(2)
Connect output of Bias Box to D607 cathode (R606 side).
(3)
Set voltage of Bias Box to 18V and make sure the protector is not work.
(4)
Set voltage of Bias Box to 27V, and make sure the protector functions.
3
OTHER PROTECTOR
(1)
Once finish rectified Electrolytic Capacitor short testing in + B line, check all possible damaged components on +B line. (Use random selected set for inspection)
A/V INPUT AND OUTPUT CHECKING
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
VIDEO AND AUDIO OUTPUT CHECK
(1)
Receive the "PAL Color Bar" signal (100% White Color Bar, Sound 400 Hz 100% Mod).
(2)
Terminate the Video output with a 75 ohm impedance. Make sure the output is as specified (1.0 Vp-p
±
3 dB)
(3)
Terminate the Audio output with a 10 Kohm impedance. Make sure the O/P is as specified (1.76 Vp-p
±
3 dB)
2
VIDEO AND AUDIO INPUT CHECK
(1)
Using the TV/AV key on the remote 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.
FUNCTION OPERATION CHECKING (1) (VIDEO & AUDIO)
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
CONTRAST Key
(1)
Receive "Monoscope Pattern" signal.
(2)
Set P-Mode to select CONTRAST.
(3)
Press Volume Up/Down key to check whether the CONTRAST effect is OK or not.
2
COLOUR Key
(1)
Receive "Color Bar" signal.
(2)
Set P-Mode to select COLOUR.
(3)
Press Volume Up/Down key to check whether the COLOUR effect is OK or not.
3
BRIGHTNESS Key
(1)
Receive "Monoscope Pattern" signal.
(2)
Set P-Mode to select BRIGHTNESS.
(3)
Press Volume Up/Down key to check whether the BRIGHTNESS effect is OK or not.
4
TINT Key
(1)
Receive the "NTSC Colour Bar" signal thru AV in.
(2)
Set P-Mode to select TINT.
(3)
Press Volume Up/Down key to check TINT, UP for GREEN direction and DOWN for PURPLE direction whether is OK or not.
5
SHARPNESS Key
(1)
Receive "Monoscope Pattern" signal.
(2)
Set P-mode to select SHARPNESS.
(3)
Press Volume Up/Down key to check whether the SHARPNESS effect is OK or not.
6
CH DISPLAY COLOUR
(1)
All Ch (1~99) will have an OSD display of the channel number in green colour under AFT ON condition.
7
NORMAL Key
(1)
Once in PICTURE Mode, and the 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
: CENTER
8
WHITE TEMP
(1)
Receive "Monoscope Pattern" signal.
(2)
Set FUNCTION to select WHITE TEMP.
(3)
Press Volume Up/Down key to check WHITE TEMP Option, STANDARD: NORMAL SETTING, WARM for more REDDISH direction changing, COOL for more BLUISH direction changing.
9
COLOUR SYSTEM
(1)
Receive the "PAL COLOUR BAR" signal, 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.
(2)
Receive "NTSC 4.43/3.58 COLOUR BAR" signal thru AV, press 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.