20/21V-J100M
20/21V-J200S
e MTS ADJUSTMENT
(Only for 20/21V-J200S)
MTS Level Adjustment
1. Feed the following monaural signal to C3005 (�).
Monaural signal : 300Hz, 245mVrms
2. Connect the rms voltmeter to pin (39) of IC3001.
3. Enter the service mode ant select the service
adjustment "M01".
4. Adjust the data so that the rms voltmeter should take
the reading 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 (100?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 the frequency counter should
take the reading 62.94 ? 0.75kHz.
Filter Adjustment
1. Feed the following stereo pilot signal to C3005
(�).
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.
5. Receive the following composite stereo signal 2.
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 the AC voltage reading of the rms
voltmeter is minimum.
8. Take the above steps 1. thru 7. again for fine
adjustment.
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