Audio System Adjustments; Playback Level Check; Overall Level Characteristics Check; Overall Distortion Check - Sony GV-D1000 Service Manual

GV-D1000/D1000E
3-6.

AUDIO SYSTEM ADJUSTMENTS

[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to the
video system measuring instruments as shown in Fig. 5-3-11.
[Adjustment Procedure]

1) Playback level check

2) Overall level characteristics check

3) Overall distortion check

4) Overall noise level check
5) Overall separation check
Recording
Pattern generator
VIDEO
(Yellow)
VIDEO OUT
(75 Ω)
600 Ω
Audio generator
Attenuator
600 Ω: 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
Playback
Main unit
AUDIO OUT
L
VIDEO OUT
Monitor TV
Main Unit
AUDIO/VIDEO
INPUT
AUDIO
LEFT
(White)
AUDIO
RIGHT
(RED)
R
47k Ω(1-249-437-11)
47k Ω
47k Ω
Audio level meter
or distortion meter
Fig. 5-3-11.
1. Playback Level Check
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Check that the playback signal level is the specified value.
2. Overall Level Characteristics Check
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400Hz, –7.5dBs signal in the audio terminal left and
right of AUDIO/VIDEO INPUT jack.
2) Record the signal.
3) Playback the recorded section.
4) Check that the 400Hz signal level is the specified value.
3. Overall Distortion Check
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400Hz, –7.5dBs signal in the audio terminal left and
right of AUDIO/VIDEO INPUT jack.
2) Record the signal.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
5-24
Playback
Alignment tape:
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
AUDIO OUT jack LEFT or RIGHT
Audio level meter and frequency
counter
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.
Recording and playback
400Hz, –7.5dBs signal: Audio
terminal left and right of AUDIO/
VIDEO INPUT jack
AUDIO OUT jack LEFT or RIGHT
Audio level meter
–7.5 ± 3.0dBs
Recording and playback
400Hz, –7.5dBs signal: Audio
terminal left and right of AUDIO/
VIDEO INPUT jack
AUDIO OUT jack LEFT or RIGHT
Audio distortion meter
Below 0.4%
(200Hz to 6kHz BPF ON)