Read Sony DCR-IP1 / DCR-IP1E (serv.man4) Service Manual online
DCR-IP1/IP1E
6-52
3-5.
AUDIO SYSTEM ADJUSTMENTS
[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments as shown in Fig.
6-3-8.
6-3-8.
1.
Overall Level Characteristic Check
Mode
Recording and playback
(PLAY/EDIT mode)
(PLAY/EDIT mode)
Signal
400 Hz, –7.5 dBs signal:
Audio L and R terminal of A/V jack
Audio L and R terminal of A/V jack
Measurement Point
Audio L and R terminal of A/V jack
(47 k
(47 k
Ω loaded)
Measuring Instrument
Audio level meter
Specified value
–7.5
± 1.0 dBs
Checking method:
1) Input 400 Hz, –7.5 dBs signal in the audio L and R terminal.
2) Record in the signal
3) Playback the recorded section.
4) Check that the 400 Hz signal level is the specified value.
1) Input 400 Hz, –7.5 dBs signal in the audio L and R terminal.
2) Record in the signal
3) Playback the recorded section.
4) Check that the 400 Hz signal level is the specified value.
2.
Overall Distortion Check
Mode
Recording and playback
(PLAY/EDIT mode)
(PLAY/EDIT mode)
Signal
400 Hz, –7.5 dBs signal:
Audio L and R terminal of A/V jack
Audio L and R terminal of A/V jack
Measurement Point
Audio L and R terminal of A/V jack
(47 k
(47 k
Ω loaded)
Measuring Instrument
Audio distortion meter
Specified value
Below 0.4%
(200 Hz to 6 kHz BPF ON)
(200 Hz to 6 kHz BPF ON)
Checking method:
1) Input 400 Hz, –7.5 dBs signal in the audio L and R terminal.
2) Record in the signal
3) Playback the recorded section.
4) Check that the distortion is the specified value.
1) Input 400 Hz, –7.5 dBs signal in the audio L and R terminal.
2) Record in the signal
3) Playback the recorded section.
4) Check that the distortion is the specified value.
3.
Overall Noise Level Check
Mode
Recording and playback
(PLAY/EDIT mode)
(PLAY/EDIT mode)
Signal
No signal:
Audio L and R terminal of A/V jack
Audio L and R terminal of A/V jack
Measurement Point
Audio L and R terminal of A/V jack
(47 k
(47 k
Ω loaded)
Measuring Instrument
Audio distortion meter
Specified value
Below –45 dBs
(IHF-A filter ON, LPF ON)
(IHF-A filter ON, LPF ON)
Checking method:
1) Insert shorting plugs in each of audio L and R terminal.
2) Record in the signal
3) Remove the shorting plugs.
4) Playback the recorded section.
5) Check that the noise level is the specified value.
1) Insert shorting plugs in each of audio L and R terminal.
2) Record in the signal
3) Remove the shorting plugs.
4) Playback the recorded section.
5) Check that the noise level is the specified value.
Pattern generator
Video output
(75
Ω
)
Audio
oscillator
Attenuator
600
Ω
600
Ω
(270
Ω
(1-249-410-11) +330
Ω
(1-249-411-11))
Main unit
Main unit
A/V jack
A/V jack
Audio L
Audio R
Audio L
Audio R
Video
Video
In Recording (PLAY/EDIT mode)
In Playback (PLAY/EDIT mode)
47k
Ω
47k
Ω
:1-249-437-11
Audio level meter
or
distortion meter
or
distortion meter
TV monitor
Fig. 6-3-8
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