5-39
CCD-TRV107/TRV108/TRV308/TRV408/TRV608
3-5.
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.
1. 1.5 MHz Deviation Adjustment (VC-272 board)
Adjust to the optimum 1.5MHz audio FM signal deviation.
If the adjustment is not correct, its playback level will differ from
that of other units.
Mode
Playback
Signal
Alignment tape:
For checking operation
(WR5-5NSP)
Measurement Point
Audio terminal of A/V OUT jack
Measuring Instrument
Audio level meter
Adjustment Page
F
Adjustment Address
73
Specified Value
–7.5 ± 2.0dBs
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
F
73
Change the data and set the 400Hz
audio signal level to the specified
value.
3
F
73
Press PAUSE button.
4
0
01
00
Set the data.
2. BPF f
0
Adjustment (VC-272 board)
Sets the BPF passing frequency of IC351 so that the AFM signal
can separate from the playback RF signal properly. If deviated. the
mono/stereo mode will be differentiated incorrectly, and noises and
distortions will increase during high volume playback.
Mode
Playback
Signal
Alignment tape:
For BPF adjustment
(WR5-11NS)
Measurement Point
Audio terminal of A/V OUT jack
Measuring Instrument
Distortion meter
Adjustment Page
F
Adjustment Address
74
Specified Value
The distortion rate should be minimum.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
F
74
Change the data and minimize the
distortion rate.
3
F
74
Press PAUSE button.
4
0
01
00
Set the data.
Fig. 5-3-11.
Main unit
A/V OUT
Audio
47k
Ω
Video (Yellow)
TV monitor
Audio level meter
or Distortion meter
47k
Ω
(1-249-437-11)
Playback
(Black)