Overall Level Characteristics Check; Overall Distortion Check; Overall Noise Level Check - Sony DCR-DVD100 Service Manual

DCR-DVD100/DVD100E
COVER COVER
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-R
[Connection of Audio System Measuring Devices]
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.
Recording
Pattern generator
Video output
(75 Ω)
600 Ω
Audio oscillator
Attenuator
600 Ω: 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
Playback
Main unit
AUDIO/VIDEO
Left (White)
Right
(Red)
[How to record the line input signal]
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
3) Press the REC button.
Video
(Yellow)
Main unit
Left
AUDIO/VIDEO
(White)
Right
(Red)
TV monitor
Video (Yellow)
Audio level meter
47k Ω
or Distortion meter
47k Ω
47k Ω (1-249-437-11)
Fig. 6-2-6.
).

1. Overall Level Characteristics Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method
1) Input the 400Hz, -7.5dBs signal in the AUDIO L and AUDIO
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
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method
1) Input the 400Hz, -7.5dBs signal in the AUDIO L and AUDIO
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
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method
1) Insert shorting plugs in each of AUDIO L and AUDIO R
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.
6-42
PLAY ( ) mode
Recording and playback
400Hz, -7.5dBs signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Audio level meter
-7.5 ± 1.0dBs
PLAY ( ) mode
Recording and playback
400Hz, -7.5dBs signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Audio distortion meter
Below 0.4% (200Hz to 6kHz BPF ON)
PLAY ( ) mode
Recording and playback
No signal:
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
AUDIO L and AUDIO R terminal of
AUDIO/VIDEO jack
Audio level meter
Below -45dBs
(IHF-A filter ON, 20kHz LPF ON)