Monaural Audio System Adjustment; Trv57/Trv57P/Trv67); Mhz Deviation Adjustment (Vc-234 Board); Bpf Adjustment (Vc-234 Board) - Sony CCD-TR317 Service Manual

3-7.

MONAURAL AUDIO SYSTEM ADJUSTMENT

(CCD-TR317/TR517/TRV17/TRV37/TRV47/

TRV57/TRV57P/TRV67)

[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments besides the video
system measuring instruments as shown Fig. 5-3-21.
Main unit
VIDEO
AUDIO
Fig. 5-3-21.
Audio level meter or
distortion meter
47k Ω
47k Ω :1-249-437-11
TV monitor

1. 1.5 MHz Deviation Adjustment (VC-234 board)

Adjust to the optimum 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 :
1) Select page: 0, address: 01, and set data: 01.
2) Select page: F, address: 7B, change the data and set the 400Hz
signal level to the specified value.
3) Press the PAUSE button of the adjustment remote commander.
4) Select page: 0, address: 01, and set data: 00.

2. BPF Adjustment (VC-234 board)

Adjust to the optimum audio BPF characteristics of the IC.
If the adjustment is not correct, the distortion rate and S/N ratio will
worsen.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method :
1) Select page: 0, address: 01, and set data: 01.
2) Select page: F, address: 7D, change the data and minimize the
distortion rate.
3) Press the PAUSE button of the adjustment remote commander.
4) Select page: 0, address: 01, and set data: 00.
5-55
Playback
Alignment tape:
For checking the operation
(WR5-5NSP)
Audio output terminal
Audio level meter
F
7B
–7.5 ± 0.5dBs
Playback
Alignment tape:
For BPF adjustment (WR5-11NS)
Audio output terminal
Distortion meter
F
7D
The distortion rate should be and
minimum.