20/21V-J100M
20/21V-J200S
e SERVICE ADJUSTMENT
VCO AdjustmentWhite Balance Adjustment
1. Connect a digital voltmeter between pin (44) of IC2011. Have unit receive a good local channel.
and ground.2. Enter the service mode and select service adjustment
2. Select a good local channel."S03" and set to "00" (minimum color). "S03" does not
3. Enter the service mode and select adjustment "S10".have to be adjusted, if you selected a B/W picture or
4. Adjust the data so that digital voltmeter reads 2.2Vmonoscope pattern..
5. Adjustment is complete, remove the voltmeter3, retur. Alternately adjust service adjustment data of "S14" andn
to "normal" mode."S15" until a good grey scale with normal whites is
obtained.
RF AGC Adjustment4. Select service adjustment "S03" and adjust data to
obtain normal color level.
1. Have unit receive a good local channel.
2. Enter the service mode and select service adjustment
"S08".Sub-Picture Adjustment
3. Set the data value to point where no noise or beat1. Have unit receive a good local channel.
appears.2. Make sure the customer picture control is set to
4. Select another channel to confirm that no noise or beatmaximum.
appears.3. Enter the service mode and select service adjustment
Note1: You will have to come out of the service"S01".
mode to select another channel.4. Adjust the data value to achieve normal contrast range.
Note2: Setting the data to "00" will produce a black
raster.Sub-Tint Adjustment
Screen Adjustment1. Have unit receive a good local channel.
2. Set customer tint control to center of it's range.
1. Connect a digital voltmeter between TP852 and 3.TP853Enter the service mode and select service adjustment
on the CRT socket PWB."S02".
Note : These test points may not be provided.4. Adjust "S02" data value to obtain normal flesh tones.
Then connect the voltmeter to both ends
of R852 located near Q852 on the foil side.
2. Select a good local channel.
3. Enter the service mode and select service adjustment
"S03" and set the data value to "00" to set the color
level to minimum. (Record original data code under
adjustment "S03" before changing) You may skip this
step, if you selected a B/W picture or monoscope
pattern.
4. Select service adjustment "S19" and adjust the data
value to "01" this turn off the luminance signal (Y-mute).
5. Select service adjustment "S04" and adjust data value
to obtain 0.17 volts on the digital voltmeter.
6. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.
7. Adjust service adjustments "S11" red, "S12" green and
"S13" blue to obtain a good grey scale with normal
whites at low brightness level.
8. Select service adjustment "S19" and reset data to "00".
Select service adjustment "S03" and reset data to
obtain normal color level.
9. Remove digital voltmeter.
Reset master screen control to obtain normal
brightness range.
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ACEC
