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9

14LK20A

Sub-Brightness Adjustment

1. Receive a good local channel.
2. Make sure the customer brightness control is set to

center position.

3. Enter the service mode and select the service

adjustment "S04".

4. Adjust "S04" data value to obtain normal brightness

level.

Vertical-Size Adjustment

1. Receive a good local channel.
2. Enter the service mode and select the service

adjustment "S09".

3. While observing the top and bottom of the screen,

adjust "S09" data value to proper vertical size.

Vertical Phase Adjustment

1. Enter the service mode and select the service

adjustment "S06".

2. Adjust data value to "00"~"03" so that picture is

approximate center.
Note: This must be set "00"~"03" when adjust

another data retrace line will be appear.

Horizontal Position Adjustment

1. Receive a good local channel.
2. Enter the service mode and select the service

adjustment  "S07".

3. Adjust "S07" data value so that picture is centered.

Caption Position Adjustment (Horizontal)

1. Receive a good local channel.
2. Enter the service mode and select the service

adjustment "S18".

3. A black text box appears on the screen. (see Figure

B. below)

4. Adjust "S18" data value so that text box is positioned

in the center of the screen.

Figure B.

3.58MHz Trap Adjustment

1. Receive a good local channel.
2. Enter the service mode and select the service

adjustment "S16".

3. This is a two position adjustment, "00" is ON, "01"  is

OFF.

4. Adjust data value to "00" for normal viewing.

Sharpness and Audio Balance Adjust-
ments

1. Receive a good local channel.
2. Enter the service mode and select the service

adjustments "S05" for sharpness and "S17" for audio
balance.

»

 Sharpness Adjustment

3. Adjust data value to "24" (center of data range) for

sharpness adjustment.

»

 Audio Balance Adjustment

4. Adjust data value to "20" (center of data range) for

Audio balance adjustment.

Содержание 14LK20A

Страница 1: ... LIST 19 PACKING OF THE SET 25 Page CONTENTS SERVICE MANUAL MODEL POWER INPUT 110 220 V AC 50 60 Hz POWER RATING 63 W PICTURE SIZE 580cm2 89 8sq inch CONVERGENCE Magnetic SWEEP DEFLECTION Magnetic FOCUS Hi Bi Potential Electrostatic INTERMEDIATE FREQUENCIES Picture IF Carrier Frequency 45 75 MHz Sound IF Carrier Frequency 41 25 MHz Color Sub Carrier Frequency 42 17 MHz Nominal AUDIO POWER OUTPUT R...

Страница 2: ...oes not exceed the specified value and that it is regulating correctly 5 Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry 6 When trouble shooting and taking test measurements on a receiver with excessive high voltage avoid being unnecessarily close to the receiver Do not operate the receiver longer than is necessary to lo...

Страница 3: ...works mechanical insulators and etc 3 To be sure that no shock hazard exists check for leakage current in the following manner Plug theAC cord directly into a 110 120 voltAC outlet Do not use an isolation transformer for this test Using two clip leads connect a 1 5k ohm 10 watt resistor paralleled by a 0 15µF capacitor in series with all exposed metal cabinet parts and a known earth ground such as...

Страница 4: ...4 14LK20A LOCATION OF USER S CONTROL ...

Страница 5: ...rnal 26 8V DC at TP653 by using an external DC supply TV must be shut off 6 To reset the protector unplug the AC cord and make a short circuit between TP651 and TP652 Now make sure that normal picture appears on the screen 7 If the operation of the horizontal oscillator does not stop in step 5 the circuit must be repaired before the set is returned to the customer HIGH VOLTAGE CHECK High voltage i...

Страница 6: ...tomer controls are in their proper reset position 2 Service number selection Once in the service mode press the Ch up or Ch down button on the remote controller or at the set The service adjustment number will vary in increments of one from S01 to M05 Select the item you wish to adjust 3 Data number selection Press the Vol up or down button to adjust the data number To enter the service mode and e...

Страница 7: ...19 Y MUTE 00 00 01 03 00 NORMAL 01 No Y 03 No VERTICAL OP OPTION 80 00 FF Must be set to 08 M01 MTS LEVEL 0A 00 0F M02 STEREO VCO 20 00 3F M03 FILTER 1C 00 3F M04 LOW SEPARATION 20 00 3F M05 HIGH SEPARATION 1B 00 3F IC2001 IC2101 X CRT X IC201 Data is stored in IC2101 Adjust items related to picture tube only Table A Holding down both the Ch up down buttons on the TV set at service mode for more t...

Страница 8: ...he digital voltmeter 6 Adjust the master screen control 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...

Страница 9: ...r the service mode and select the service adjustment S07 3 Adjust S07 data value so that picture is centered Caption Position Adjustment Horizontal 1 Receive a good local channel 2 Enter the service mode and select the service adjustment S18 3 A black text box appears on the screen see Figure B below 4 Adjust S18 data value so that text box is positioned in the center of the screen Figure B 3 58MH...

Страница 10: ...10 14LK20A CHASSIS LAYOUT 6 5 4 3 2 1 A B C D E F G H ...

Страница 11: ...11 14LK20A 6 5 4 3 2 1 A B C D E F G H BLOCK DIAGRAM ...

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