Sony D8 Digital Handycam DCR-TRV820E, Руководство по обслуживанию, Страница: 182 / 233

5-53
1. Hi8/standard 8 mm AFM BPF f
0
Adjustment
(VC-235 board)
Sets the BPF passing frequency of IC5701 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
Hi8/standard 8 mm alignment tape:
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
Measurement Point
Audio left or right terminal of A/V
jack
Measuring Instrument Distortion meter
Adjustment Page F
Adjustment Address 7D
Specified Value
The Main and Sub channel distortion
rate should be almost the same
(within ± 1%) and minimum.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Set the Hi-Fi sound switch (menu display) to “2”.
3) Select page: F, address: 7D, change the data and minimize the
distortion rate.
4) Press the PAUSE button of the adjustment remote commander.
5) Set the Hi-Fi sound switch (menu display) to “1”.
6) Select page: F, address: 7D, change the data and minimize the
distortion rate.
7) Press the PAUSE button of the adjustment remote commander.
8) Repeat steps 2) to 7) and set the data of address: 7D so that the
distortions rates when the Hi-Fi sound switch is set to “2” and
set to “1” respectively are almost the same and minimum.
9) Press the PAUSE button of the adjustment remote commander.
10) Select page: 0, address: 01, and set data: 00.
11) Set the Hi-Fi sound switch to “STEREO”.
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. 5-3-18.
[Adjustment Procedure]
1) Hi8/standard 8 mm AFM BPF f
0
adjustment
2) Hi8/standard 8 mm AFM 1.5 MHz deviation adjustment
3) Hi8/standard 8 mm AFM 1.7 MHz deviation adjustment
4) Digital8 playback level check
5) Overall level characteristics check
6) Overall distortion check
7) Overall noise level check
8) Overall separation check
Fig. 5-3-18
Pattern generator
Video output
(75
Ω
)
Audio
oscillator
Attenuator
600
Ω
600
Ω
(270
Ω
(1-249-410-11) +330
Ω
(1-249-411-11))
Main unit
Main unit
47 k
Ω
47 k
Ω
: 1-249-437-11
Audio level meter or
distortion meter
TV monitor
A/V jack
A/V jack
Video
Audio (L)
Audio (R)
Video
Audio (L)
Audio (R)
In Recording
In Playback