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8-10
2-7-2. VCO f
0
Adjustment (MA-283 Board)
[Adjustment Object]
To attain Hi-Fi audio compatibility.
If this apecification is not satisfied, the sound will be distorted.
To attain Hi-Fi audio compatibility.
If this apecification is not satisfied, the sound will be distorted.
Mode
Recording
Signal
No-signal
Measuring
Frequency counter
instrument
Measurement
CN503 pin1
point
1.4MHz adjustment
Adjustment
RV521 (Lch)
element
Specified
1400±1kHz
value
1.8MHz adjustment
Adjustment
RV531 (Rch)
element
Specified
1800±1kHz
value
Note :
Connect the frequency counter through the buffer amplifier
(oscilloscope, etc) with high input resistance (1MΩ or more)
and low capacity (10pF or less).
(oscilloscope, etc) with high input resistance (1MΩ or more)
and low capacity (10pF or less).
[Adjusting Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Adjust RV521 so as to obtain 1400±1kHz.
4) Set TRACKING button on the remote commander to MANUAL.
5) Adjust RV531 so as to obtain 1800±1kHz.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Adjust RV521 so as to obtain 1400±1kHz.
4) Set TRACKING button on the remote commander to MANUAL.
5) Adjust RV531 so as to obtain 1800±1kHz.
2-7-3. Deviation Check (MA-283 Board)
Mode
Recording
Signal
400Hz, –7.5dBs : CN502 pin!£!∞
Measurement
CN503 pin1
point
Measuring
Modulation Analyzer
instrument
Specified
50±50kHz
value
[Check Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Verify that the output signal satisfies the specification.
4) Set TRACKING button on the remote commander to MANUAL.
5) Verify that the output signal satisfies the specification.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Verify that the output signal satisfies the specification.
4) Set TRACKING button on the remote commander to MANUAL.
5) Verify that the output signal satisfies the specification.
2-7-4. Band Pass Filter f
0
Adjustment (MA-283 Board)
[Adjustment Object]
To separate the carrier accurately and ensure that the filter for cutting
the video signal functions normally.
If this specification is not satisfied, the sound will be distored.
To separate the carrier accurately and ensure that the filter for cutting
the video signal functions normally.
If this specification is not satisfied, the sound will be distored.
Mode
Playback
Signal
1,608MHz, 200mVp-p : CN503 pin3
Measurement
CN503 pin1
point
Measuring
Oscilloscope
instrument
Adjustment
RV541
element
Specified
Adjust the A and B amplitudes to the same level.
value
(A–B=±2mVp-p)
[Adjusting Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
(Lch signal output)
3) Assume the output value at this time as A.
4) Set TRACKING button on the remote commander to MANUAL.
4) Set TRACKING button on the remote commander to MANUAL.
(Rch signal output)
5) Assume the output value at this time as B. Adjust RV541 so that A
is equal to B.
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