Audio System Adjustments; Mhz Deviation Adjustment (Vc-272 Board); Bpf F - Sony Handycam CCD-TRV107 Service Manual

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.
Playback
Main unit
A/V OUT
Audio
(Black)
47k Ω (1-249-437-11)
Fig. 5-3-11.
TV monitor
Video (Yellow)
Audio level meter
or Distortion meter
47k Ω
CCD-TRV107/TRV108/TRV308/TRV408/TRV608

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
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 F 73
3 F 73
4 0 01

2. BPF f

Adjustment (VC-272 board)
0
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
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 F 74
3 F 74
4 0 01
5-39
Playback
Alignment tape:
For checking operation
(WR5-5NSP)
Audio terminal of A/V OUT jack
Audio level meter
F
73
–7.5 ± 2.0dBs
Procedure
01 Set the data.
Change the data and set the 400Hz
audio signal level to the specified
value.
Press PAUSE button.
00 Set the data.
Playback
Alignment tape:
For BPF adjustment
(WR5-11NS)
Audio terminal of A/V OUT jack
Distortion meter
F
74
The distortion rate should be minimum.
Procedure
01 Set the data.
Change the data and minimize the
distortion rate.
Press PAUSE button.
00 Set the data.