27R-S200, 27R-S400
27R-S450, CR27S20
CSR20027
SERVICE ADJUSTMENT
VCO AdjustmentWhite Balance Adjustment
1. Connect a digital voltmeter between pin (55) of IC2011. Receive a good local channel.
and ground.2. Enter the service mode and select the service
2. Receive a good local channel.adjustment "V03" and set to "00" (minimum
3. Enter the service mode and select the servicecolor)(Record original data code under adjustment
adjustment "R02"."V03" before changing). "V03" does not have to be
4. Adjust T201 so that digital voltmeter readsadjusted, if you selected a B/W picture or monoscope
2.5?1.0VDC.pattern.
5. Adjustment is completed, remove the voltmeter3. Alternately adjust the service adjustment data of "V09",
return to "normal" mode.and "V10" until a good grey scale with normal whites
is obtained. (RF Input)
RF AGC Adjustment4. For component input, the data value of "V49" and
"V50" is adjusted to follow the data value of "V09"
1. Receive a good local channel.
and "V10" respectively.
2. Enter the service mode and select the service
5. Select the service adjustment "V03" and reset data
adjustment "R01".
to obtain normal color level.
3. Set the data value to point where no noise or beat
appears.
Picture Adjustment
4. Select another channel to confirm that no noise or
beat appears.1. Receive a good local channel.
Note 1 :You will have to come out of the ser2.viceMake sure the customer picture control is set to
mode to select another channel.maximum.
Note 2 :Setting the data to "00" will produce a black3. Enter the service mode and select the service
raster.adjustment "V01".
4. Adjust the data value to achieve normal contrast
Screen Adjustmentrange.
1. Receive a good local channel.
Tint Adjustment
2. Enter the service mode and select the service
adjustment "V03" and set the data value to "00" to1. Receive a good local channel.
set the color level to minimum. (Record original data2. Set customer tint control to center of it's range.
code under adjustment "V03" before changing) 3. YEnter the serouvice mode and select the service
may skip this step, if you selected a B/W picture oradjustment "V02".
monoscope pattern.4. Adjust "V02" data value to obtain normal flesh tones.
3. Select the service adjustment "V18" and adjust the5. Input same data to "V41".
data value to "01", this turn off the luminance signal
(Y-mute).Sub-Color Adjustment
4. Adjust the master screen control until the raster
darkens to the point where raster is barely seen.1. Receive a good local channel.
2. Make sure the customer color control is set to center
5. Adjust the service adjustments "V06" red, "V07" green
position .
and "V08" blue to obtain a good grey scale with
3. Enter the service mode and select service adjustment
normal whites at low brightness level.
"V04".
6. Select the service adjustment "V18" and reset data
4. Adjust "V04" data value to obtain normal color level.
to "00". Select the service adjustment "V03" and reset
data to obtain normal color level.
7. For component input, the data value of "V46" red,Brightness Adjustment
"V47" green and "V48" blue is adjusted to follow the
1. Receive a good local channel.
data value of "V06", "V07" and "V08" respectively.
2. Make sure the customer brightness control is set to
8. Reset the master screen control to obtain normal
center position.
brightness range.
3. Enter the service mode and select the service
adjustment "V05".
4. Adjust "V05" data value to obtain normal brightness
level.
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ACEC
