Sony DCR-TRV10 Service Manual - Page 140
Playback Level Check, Overall Level Characteristics Check, Overall Distortion Check
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1. Playback Level Check Mode VTR playback Signal Alignment tape: For audio operation check (XH5-3 (NTSC)) (XH5-3P (PAL)) Measurement Point Audio left or right terminal of AUDIO VIDEO jack Measuring Instrument Audio level meter and frequency counter Specified Value 32 kHz mode: 1 kHz, +3.0 ± 2.0dBs 48 kHz mode: 1 kHz, +3.0 ± 2.0dBs 44.1 kHz mode: The 7.35kHz signal level during EMP OFF is +2.0 ± 2.0dBs. The 7.35kHz signal level during EMP ON is -6 ± 2 dB from the signal level during EMP OFF. Checking Method: 1) Check that the playback signal level is the specified value. 2. Overall Level Characteristics Check Mode Camera recording and playback Signal 400Hz, -66 dBs signal: MIC jack left and right Measurement Point Audio left or right terminal of AUDIO VIDEO jack Measuring Instrument Audio level meter Specified Value -7.5 ± 3.0dBs Checking Method: 1) Input the 400Hz, -66dBs signal in the MIC jack. 2) Record in the camera mode. 3) Playback the recorded section. 4) Check that the 400Hz signal level is the specified value. 3. Overall Distortion Check Mode Camera recording and playback Signal 400Hz, -66dBs signal: MIC jack left and right Measurement Point Audio left or right terminal of AUDIO VIDEO jack Measuring Instrument Audio distortion meter Specified Value Below 0.4% (200Hz to 6kHz BPF ON) Checking Method: 1) Input the 400Hz, -66dBs signal in the MIC jack. 2) Record in the camera mode. 3) Playback the recorded section. 4) Check that the distortion is the specified value. 4. Overall Noise Level Check Mode Camera recording and playback Signal No signal: Insert a shorting plug in the MIC jack Measurement Point Audio left or right terminal of AUDIO VIDEO jack Measuring Instrument Audio level meter Specified Value Below -45dBs (IHF-A filter ON, 20kHz LPF ON) Checking Method: 1) Insert a shorting plug in the MIC jack. 2) Record in the camera mode. 3) Playback the recorded section. 4) Check that the noise level is the specified value. 5. Overall Separation Check Mode Camera recording and playback Signal 400Hz, -66dBs signal: MIC jack [left] (Connect the MIC jack [right] to GND) Measurement Point Audio [right] terminal of AUDIO VIDEO jack Measuring Instrument Audio level meter Specified Value Below -40dBs (IHF-A filter ON) < > : Left channel check [ ] : Right channel check Checking Method: 1) Input the 400Hz, -66dBs signal in the [left] terminal of the MIC jack only. 2) Record in the camera mode. 3) Playback the recorded section. 4) Check that the signal level of the audio [right] terminal is the specified value. 5-54