Sony CCD-CCD-TRV49E, Service Manual, Page: 155 / 234

5-49
Fig. 5-3-16.
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)
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. 5-3-16.
1. 1.5MHz Deviation Adjustment (VC-251 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 (NTSC))
(WR5-5CSP (PAL))
Measurement Point Audio terminal of A/V OUT jack
Measuring Instrument Audio level meter
Adjustment Page F
Adjustment Address 7B
Specified Value –7.5 ± 2.0 dBs
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 F 7B Change the data and set the
400Hz audio signal level to the
specified value.
3 F 7B Press PAUSE button.
4 0 01 00 Set the data.
2. BPF fo Adjustment (VC-251 board)
Sets the BPF passing frequency of IC760 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 (NTSC)
(WR5-11CS (PAL))
Measurement Point Audio terminal of A/V OUT jack
Measuring Instrument Distortion meter
Adjustment Page F
Adjustment Address 7D
Specified Value The distortion rate should be minimum.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 F 7D Change the data and minimize
the distortion rate.
3 F 7D Press PAUSE button.
4 0 01 00 Set the data.