27K-S100/180/300/400
CK27S10/18/30/40
SERVICE ADJUSTMENT
VCO AdjustmentWhite Balance Adjustment
1. Connect a digital voltmeter between pin (44) 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 "S03" and set to "00" (minimum
3. Enter the service mode and select the servicecolor)(Record original data code under adjustment
adjustment "S10"."S03" before changing). "S03" does not have to be
4. Adjust the data so that digital voltmeter reads 2.2Vadjusted, if you selected a B/W picture or monoscope.
5. Adjustment is completed, remove the voltmeterpattern.,
return to "normal" mode.3. Alternately adjust the service adjustment data of "S14"
and "S15" until a good grey scale with normal whites
RF AGC Adjustmentis obtained.
4. Select the service adjustment "S03" and adjust data
1. Receive a good local channel.
2. Enter the service mode and select the serviceto obtain normal color level.
adjustment "S08".Sub-Picture Adjustment
3. Set the data value to point where no noise or beat
appears.1. Receive a good local channel.
4. Select another channel to confirm that no noise or2. Make sure the customer picture control is set to
beat appears.maximum.
Note 1 :You will have to come out of the service3. Enter the service mode and select the service
mode to select another channel.adjustment "S01".
Note 2 :Setting the data to "00" will produce a black4. Adjust the data value to achieve normal contrast
raster.range.
Screen AdjustmentSub-Tint Adjustment
1. Connect a digital voltmeter between TP852 and1. Receive a good local channel.
TP853 on the CRT Unit.2. Set customer tint control to center of it's range.
Note:These test points may not be provided.3. Enter the service mode and select the service
Then connect the voltmeter to both ends ofadjustment "S02".
R852 located near Q851 on the foil side.4. Adjust "S02" data value to obtain normal flesh tones.
2. Receive a good local channel.
3. Enter the service mode and select the serviceSub-Color Adjustment
adjustment "S03" and set the data value to "00" to1. Receive a good local channel.
set the color level to minimum. (Record original data
code under adjustment "S03" before changing) You2. Make sure the customer color control is set to center
may skip this step, if you selected a B/W picture orposition .
3. Enter the service mode and select service adjustment
monoscope pattern.
4. Select the service adjustment "S19" and adjust the"S03".
data value to "01", this turn off the luminance signal4. Adjust "S03" data value to obtain normal color level.
(Y-mute).
5. Select the service adjustment "S04" and adjust data
value to obtain 0.26 volts on the digital voltmeter.
6. Adjust the master screen cotrol until the raster
darkens to the point where raster is barely seen.
7. Adjust the service adjustments "S11" red, "S12" green
and "S13" blue to obtain a good grey scale with
normal whites at low brightness level.
8. Select the service adjustment "S19" and reset data
to "00". Select the service adjustment "S03" and reset
data to obtain normal color level.
9. Remove digital voltmeter, and reset the master screen
control to obtain normal brightness range.
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ACEC
