Sharp 20J-S100 Service Manual - Page 11

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Caption position adjustment (horizontal)

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment

"S18".

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

C ) .

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

in the center of the screen.

Figure C.

3.58MHz trap adjustment

1. Have unit receive a good local channel.

2. Enter the service mode and select 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. Have unit receive a good local channel.

2. Enter the service mode and select "S05" for

sharpness and "S17" for balance.

•

Sharpness adjustments

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

sharpness adjustment.

•

Audio balance adjustments

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

Audio balance adjustment.

5. Receive the following composite stereo signal2.

Stereo signal :30% modulation , left channel only,

noise reduction on, 3kHz.

6. Enter the service mode and select the service

adjustment "M05".

7. Adjust the data until theAC voltage reading of the

rms voltmeter is minimum.

8. Take the above steps 1 thru 8 again for fine

adjustment.

MTS level adjustment

1. Feed the following monaural signal to pin (14) of

IC3001.

Monaural signal: 300Hz,245mVrms

2. Connect the rms voltmeter to pin (39) of IC3001.

3. Enter the service mode and select the service

adjustment "M01".

4. Adjust the data so that the rms voltmeter should take

the reading below. Spec:490 ±10mVrms.

Stereo VCO adjustment

1. Keep the unit in no-signal state.

2. Connect the frequency counter to pin (39) of IC3001.

3. Connect a capacitor (100µ F, 50V) in between positive

(+) side of C3005 and ground.

4. Enter the service mode and select the service

adjustment "M02".

5. Adjust the data so that frequency counter should take

the reading below.Spec:62.94 ±0.75kHz

Filter adjustment

1. Feed the following stereo pilot signal to pin (14) of

IC3001.Stereo pilot signal:9.4kHz,600mVrms.

2. Enter the service mode and select the service

adjustment "M03".

3. Adjust the data at the point where "OK" appears on

the screen. The "OK" represents the approximate

center of the adjustable range of the data.

Separation Adjustment

1. Connect the rms voltmeter to pin (39) of IC3001.

2. Receive the following composite stereo signal 1.

Composite stereo signal: 30% modulation, left

channel only, noise reduction on, 300Hz.

3. Enter the service mode and select the service

adjustment "M04".

4. Adjust the data until the AC voltage reading of the

rms voltmeter is minimum.

20J-S100/100S

CJ20S10/21MJ50