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3. BPF f0 Adjustment (VC-234 board)
Sets the BPF passing frequency 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 Alignment tape:
For BPF adjustment
(WR5-11NS)
Measurement Point Audio output terminal left or right
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: 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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