Audio System Adjustments; Bpf F Adjustment (Vc-341 Board); Mhz Deviation Adjustment (Vc-341 Board) - Sony CCD-TRV138 Manual

3-5.

AUDIO SYSTEM ADJUSTMENTS

Before performing the audio system adjustments, check that the
data of page: 0, address: 10 is "00".
If not, select page: 0, address: 10, and set data "00".
[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. 6-3-9.
Main unit
A/V OUT
jack
CCD-TRV138/TRV238E/TRV338/TRV438E
In Playback
Audio level meter
or distortion meter
Audio
47 kΩ
47 kΩ: 1-249-437-11
TV monitor
Video
Fig. 6-3-9
1. BPF f Adjustment (VC-341 Board)
0
Set the BPF passing frequency of IC801 so that the AFM signal
can separate from the playback RF signal properly. If deviated,
the noises and distortions will increase during high volume play-
back.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note: Check that the data of page: 0, address: 10 is "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 30
3 C 30
4 0 01

2. 1.5 MHz Deviation Adjustment (VC-341 Board)

Adjust to the optimum 1.5 MHz audio FM signal deviation.
If the adjustment is not correct, its playback level will differ from
that other units.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified value
Note 1: Check that the data of page: 0, address: 10 is "00".
Note 2: Perform "BPF f
Adjusting method:
Order Page Address Data
1 0 01
2 C 2F
3 C 2F
4 0 01
6-35
VTR playback (PLAY/EDIT mode)
Alignment tape
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
Audio terminal of A/V OUT jack
Distortion meter
C
30
The distortion rate should be
minimum.
Procedure
01
Change the data and minimize
the distortion rate.
Press PAUSE button.
00
VTR playback (PLAY/EDIT mode)
Alignment tape
For checking operation
(WR5-5NSP (NTSC))
(WR5-5CSP (PAL))
Audio terminal of A/V OUT jack
Audio level meter
C
2F
–7.5 ± 2.0 dBs
Adjustment" before this adjustment.
0
Procedure
01
Change the data and set the
400 Hz audio signal level to
the specified value.
Press PAUSE button.
00