Sharp 20N-S100S Service-Handbuch - Seite 11

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Sharp 20N-S100S Service-Handbuch
Ë SERVICE ADJUSTMENT
RF AGC Adjustment
1. Receive a good local channel.
2. Enter the service mode signal category and select
the service adjustment "S01".
3. Set the data value to point where no noise or beat
appears.
4. Select another channel to confirm that no noise or
beat appears.
Note: You have to exit the service mode first to
select another channel.
Video Level (TV Det Video Level)
Adjustment
1. Receive a good local channel.
2. Enter the service mode signal category and select
the service adjustment "S02".
3. Set the data value to "02" first, then adjust the data in
ranges 02 ±2 step to obtain a normal contrast level.
Screen adjustment
1. Connect to oscilloscope probe between TP855 and
ground of the CRT unit.
2. Receive a good local channel.
3. Enter the service mode Signal category and set the
service adjustment "S04" to step 30. Then select the
service adjustment "S12" and set the data value to
"00" to set the color level to the minimum level. (record
the original data first). You may skip this step, if you
selected a B/W picture or monoscope pattern. Set
also the "S05/S06/S07" data to minimum level.
4. Select the service adjustment "S03" and set the data
value to "01" to turn off the luminance signal (Y-mute).
5. Select the service adjustment "S13" and adjust the
data value to obtain 2.35 volts as shown in Figure B.
6. Adjust the master screen control untill the raster
darkens to the point where raster is barely seen.
7. Adjust the service adjustment "S05" red, "S06" green,
"S07" blue to obtain a good grey scale with normal
white at low brightness level.
8. Select the service a adjustment "S03" and reset data
to "00". Select the service adjustment "S12" and reset
data to obtain normal color level.
9. Remove probe and reset the master screen control
to obtain normal brightness range.
2.35 Vdc
Figure B: WAVEFORM FOR SCREEN ADJUSTMENT
White Balance Adjustment.
1. Receive a good local channel.
2. Select the service adjustment "S12" and set the data
3. Alternately adjust the service adjustment data of "S08"
4. Select the service adjustment "S12" and reset data
Sub-Picture Adjustment
1. Receive a good local channel.
2. Make sure the customer picture control is set to
3. Enter the service mode and select the service
4. Adjust the data value to achieve normal contrast
Sub-Tint Adjustment
1. Receive a good local channel.
2. Set the customer tint control to the center of it's range.
3. Enter the service mode and select the service
4. Adjust "S11" data value to obtain normal fresh tones.
Sub-Color Adjustment
1. Receive a good local channel.
2. Make sure the customer color control is set to center
3. Enter the service mode and select the service
4. Adjust "S12" data value to obtain normal color level.
Sub-Brightness Adjustment
1. Receive a good local channel.
2. Make sure the customer brightness control is set to
3. Enter the service mode and select the service
4. Adjust "S13" data value to obtain normal brightness
GND
11
value to "00" to set the color level to the minimun.
You may skip this step, if you selected a B/W picture
or monoscope.
and "S09" untill a good grey scale with normal white
is obtained.
to obtain normal color level.
maximum.
adjustment "S10".
range.
adjustment "S11".
position.
adjustment "S12".
center position.
adjustment "S13".
level.

20N-S100S

CN20S10