Read Sony DCR-DVD301 (serv.man4) Service Manual online
6-41
DCR-DVD301
2-3.
AUDIO SYSTEM ADJUSTMENTS
Switch setting:
REC MODE (DISC SET of Menu setting) ........................ LP
Note: Reset to SP, after completing adjustments.
Type of disc to use:
DVD-RW (VF format)
DVD-RW (VF format)
[Connection of Audio System Measuring Devices]
Connect the audio system measuring devices as shown in Fig. 6-2-6.
Connect the audio system measuring devices as shown in Fig. 6-2-6.
Note: In recording mode, input a color bar signal to the video input.
1. Overall Level Characteristics Check
Mode
PLAY (
) mode
Recording and playback
Signal
400Hz, -7.5dBs signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Measurement Point
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO/VIDEO jack
Measuring Instrument
Audio level meter
Specified Value
-7.5
±
1.0dBs
Checking Method
1)
1)
Input the 400Hz, -7.5dBs signal in the AUDIO L and AUDIO
R terminal.
R terminal.
2)
Record the signal.
3)
Playback the recorded section.
4)
Check that the 400Hz signal level is the specified value.
2. Overall Distortion Check
Mode
PLAY (
) mode
Recording and playback
Signal
400Hz, -7.5dBs signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Measurement Point
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO/VIDEO jack
Measuring Instrument
Audio distortion meter
Specified Value
Below 0.4% (200Hz to 6kHz BPF ON)
Checking Method
1)
1)
Input the 400Hz, -7.5dBs signal in the AUDIO L and AUDIO
R terminal.
R terminal.
2)
Record the signal.
3)
Playback the recorded section.
4)
Check that the distortion is the specified value.
3. Overall Noise Level Check
Mode
PLAY (
) mode
Recording and playback
Signal
No signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Measurement Point
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO/VIDEO jack
Measuring Instrument
Audio level meter
Specified Value
Below -45dBs
(IHF-A filter ON, 20kHz LPF ON)
(IHF-A filter ON, 20kHz LPF ON)
Checking Method
1)
1)
Insert shorting plugs in each of AUDIO L and AUDIO R
terminal.
terminal.
2)
Record the signal.
3)
Remove the shorting plugs.
4)
Playback the recorded section.
5)
Check that the noise level is the specified value.
Fig. 6-2-6.
[How to record the line input signal]
1)
1)
Set the mode dial to PLAY/EDIT (
).
2)
Press the VISUAL INDEX button so that the line input video
signal is displayed on the LCD screen
signal is displayed on the LCD screen
3)
Press the REC buttons.
Recording
Audio oscillator
Attenuator
600
Ω
Main unit
600
Ω
: 270
Ω
(1-249-410-11) + 330
Ω
(1-249-411-11)
Main unit
Left (White)
Right
47k
Ω
47k
Ω
Video (Yellow)
TV monitor
Audio level meter
or Distortion meter
47k
Ω
(1-249-437-11)
Playback
AUDIO/VIDEO
(Red)
Video
(Yellow)
(Yellow)
Left
(White)
(White)
Right
(Red)
(Red)
Pattern generator
Video output
(75
(75
Ω
)
AUDIO/VIDEO
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