6-6
2-5-3. Overall Output Level and Distortion Factor
Check
Mode
Self-record playback
Signal
400Hz, –7.5dBs : CJ570
Measurement point
CJ570
Measuring instrument
Audio level meter and Distortion
meter
Specified value
Playback Level: –7.5
±
3dBs
Distortion: 4.0% or less
[Check Method]
1)
Input signal of 400Hz and –7.5dBs to the audio input.
2)
Record signal.
3)
Playback the recorded portion.
4)
Check that the output level is –7.5
±
3dBs.
5)
Check that the distortion factor is 4.0% or less.
2-5-4. Overall Noise Level Check
Mode
Self-record playback
Signal
No signal (Insert a shorting plug into
the Audio LINE IN terminal)
Measurement point
CJ570
Measuring instrument
Audio level meter
Specified value
– 45.5dBs or less
[Check Method]
1)
Record.
2)
Playback recorded portion.
3)
Check that noise level is – 45.5dBs or less.
2-6.
TUNER SYSTEM ADJUSTMENT
2-6-1. Separation Adjustment (MA-318 Board)
Mode
E-E
Signal
RF signal
Video : Color bar
white (100%) modulation
Audio : L: 400Hz, R: 2kHz
30% modulation
Electrical field:
60-80dBm/75
Ω
terminated
Connect an audio level meter to LINE OUT L channel via HPF.
Feed the RF signal from RF IN terminal.
Adjust with RV731 so that the output level satisfies the specified
value.
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