Sony CCD TRV16 Service Manual - Page 139

AUDIO SYSTEM ADJUSTMENT, 1.5 MHz Deviation Adjustment VC-215 board, BPF Adjustment VC-215 board

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Page 139 highlights

3-6. AUDIO SYSTEM ADJUSTMENT [Connecting the measuring instruments for the audio] Connect the audio system measuring instruments besides the video system measuring instruments as shown Fig. 5-3-25. • Connection of Audio generator and attenuator. Audio generator Attenuator 600 Ω AUDIO terminal Parts cord 600 Ω : 270 (1-249-410-11) + 330 (1-249-411-11) • Connection of Audio level meter or distortion meter Audio level meter or distortion meter AUDIO terminal Parts cord 47kΩ : 1-249-437-11 47kΩ Fig. 5-3-21. 1. 1.5 MHz Deviation Adjustment (VC-215 board) Adjust to the optimum audio FM signal distortion. 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 Playback Alignment tape: For checking the operation (WR5-5CSP) Audio output terminal Audio level meter F 46 -7.5±0.5dBs Adjusting method : 1) Select page: 0, address: 01, and set data: 01. 2) Select page: F, address: 46, change the data and set the 400Hz signal level to the specified value. 3) Press the PAUSE button of the adjusting remote commander. 4) Select page: 0, address: 01, and set data: 00. 2. BPF Adjustment (VC-215 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 Playback Alignment tape: For BPF adjustment (WR5-11CS) Audio output terminal distortion meter F 47 The distortion rate should be and minimum. Adjusting method : 1) Select page: 0, address: 01, and set data: 01. 2) Select page: F, address: 47, change the data and minimize the distortion rate. 3) Press the PAUSE button of the adjusting remote commander. 4) Select page: 0, address: 01, and set data: 00.

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3-6.
AUDIO SYSTEM ADJUSTMENT
[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments besides the video
system measuring instruments as shown Fig. 5-3-25.
Fig. 5-3-21.
Audio
generator
Attenuator
600
Ω
Parts cord 600
Ω
:
270 (1-249-410-11) + 330 (1-249-411-11)
AUDIO
terminal
Audio level meter
or distortion meter
47k
Ω
Parts cord 47k
Ω
: 1-249-437-11
AUDIO
terminal
• Connection of Audio generator and attenuator.
• Connection of Audio level meter or distortion meter
1. 1.5 MHz Deviation Adjustment (VC-215 board)
Adjust to the optimum audio FM signal distortion.
If the adjustment is not correct, its playback level will differ from
that of other units.
Mode
Playback
Signal
Alignment tape:
For checking the operation
(WR5-5CSP)
Measurement Point
Audio output terminal
Measuring Instrument
Audio level meter
Adjustment Page
F
Adjustment Address
46
Specified Value
–7.5±0.5dBs
Adjusting method :
1)
Select page: 0, address: 01, and set data: 01.
2)
Select page: F, address: 46, change the data and set the 400Hz
signal level to the specified value.
3)
Press the PAUSE button of the adjusting remote commander.
4)
Select page: 0, address: 01, and set data: 00.
2. BPF Adjustment (VC-215 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
Playback
Signal
Alignment tape:
For BPF adjustment
(WR5-11CS)
Measurement Point
Audio output terminal
Measuring Instrument
distortion meter
Adjustment Page
F
Adjustment Address
47
Specified Value
The distortion rate should be and
minimum.
Adjusting method :
1)
Select page: 0, address: 01, and set data: 01.
2) Select page: F, address: 47, change the data and minimize the
distortion rate.
3)
Press the PAUSE button of the adjusting remote commander.
4)
Select page: 0, address: 01, and set data: 00.