Read Sony SLV-777HF / SLV-778HF / SLV-788HF Service Manual online
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
meter
Specified value
Playback Level: –7.5 ± 3dBs
Distortion: 4.0% or less
Distortion: 4.0% or less
[Check Method]
1)
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)
the Audio LINE IN terminal)
Measurement point
CJ570
Measuring instrument
Audio level meter
Specified value
– 45.5dBs or less
[Check Method]
1)
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-327 Board)
Mode
E-E
Signal
RF signal
Video : Color bar
Video : Color bar
white (100%) modulation
Audio : L: 400Hz, R: 2kHz
30% modulation
Electrical field:
60-80dBm/75
Ω
terminated
Measuring instrument
Audio level meter
Measuring point
LINE OUT L
Adjusting element
RV731
Specified value
2kHz component minimum
[Adjustment Method]
1)
1)
Connect an audio level meter to LINE OUT L channel via HPF.
2)
Feed the RF signal from RF IN terminal.
3)
Adjust with RV731 so that the output level satisfies the specified
value.
value.
Click on the first or last page to see other SLV-777HF / SLV-778HF / SLV-788HF service manuals if exist.