5-68
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
VIDEO
VIDEO
AUDIO
AUDIO
L
R
L
R
In Recording
In Playback
47k
Ω
47k
Ω
:1-249-437-11
47k
Ω
:1-249-437-11
Audio level meter or
distortion meter
TV monitor
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. 5-3-22.
[Adjustment Procedure]
1) Hi8/standard 8mm AFM BPF f0 adjustment
2) Hi8/standard 8mm AFM 1.5MHz deviation adjustment
3) Hi8/standard 8mm AFM 1.7MHz 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. 5-3-22.
1. Hi8/standard 8mm AFM BPF f
0
Adjustment
(VC-213 board)
Sets the BPF passing frequency of IC760 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 8mm alignment tape:
For BPF adjustment
(WR5-11NS (NTSC))
(WR5-11CS (PAL))
Measurement Point Audio output terminal left or right
Measuring Instrument Distortion meter
Adjustment Page F
Adjustment Address\ 64
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: 64, 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: 64, 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: 64 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”.
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