2. Hi8/Standard8 AFM 1.5 MHz Deviation Adjustment4. Digital8 Playback Level Check
(VC-254 board)ModePlayback
Adjust to the optimum 1.5MHz audio FM signal deviation.
SignalDigital8 alignment tape:
If the adjustment is not correct, its playback level will differ from
For audio operation check
that of other units.
(WR5-3CD)
ModePlayback
Measurement PointAUDIO/VIDEO jack left or right
SignalHi8/Standard8 alignment tape:
Measuring Instrument Audio level meter and frequency
For checking AFM stereo operation
counter
Monoscope section (WR5-9CS)
Specified Value32 kHz mode: 1 kHz, +3.0 ? 2.0dBs
Measurement PointAUDIO/VIDEO jack left or right
48 kHz mode: 1 kHz, +3.0 ? 2.0dBs
Measuring Instrument Audio level meter44.1 kHz mode:
Adjustment PageFThe 7.35kHz signal level during EMP
OFF is +2.0 ? 2.0dBs.
Adjustment Address7B
The 7.35kHz signal level during EMP
Specified Value�7.5 ? 2.0dBs
ON is �6 ? 2 dB from the signal level
during EMP OFF.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
Checking Method:
2) Set the Hi-Fi SOUND switch (menu display) to O1�.
1) Check that the playback signal level is the specified value.
3) Select page: F, address: 7B, change the data and set the 400Hz
signal level to the specified value.
4) Press the PAUSE button.
5. Overall Level Characteristics Check
5) Set the Hi-Fi SOUND switch (menu display) to OSTEREO�.
ModeRecording and playback
6) Select page: 0, address: 01, and set data: 00.
Signal400Hz, �66dBs signal: MIC jack left
and right
3. Hi8/Standard8 AFM 1.7 MHz Deviation AdjustmentMeasurement PointAUDIO/VIDEO jack left or right
(VC-254 board)
Measuring Instrument Audio level meter
Adjust to the optimum 1.7MHz audio FM signal deviation.
Specified Value�7.5 ? 3.0dBs
If improper, this causes deteriorated separation (with stereo signal).
ModePlayback
Checking Method:
SignalHi8/Standard8 alignment tape:
1) Input the 400Hz, �66dBs signal in the MIC jack left and right.
For checking AFM stereo operation
2) Record the signal.
Monoscope section (WR5-9CS)
3) Playback the recorded section.
Measurement PointAUDIO/VIDEO jack left or right4) Check that the 400Hz signal level is the specified value.
Measuring Instrument Oscilloscope
6. Overall Distortion Check
Adjustment PageF
ModeRecording and playback
Adjustment Address7C
Signal400Hz, �66dBs signal: MIC jack left
Specified Value�7.5 ? 2.0dBs
and right
Measurement PointAUDIO/VIDEO jack left or right
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.Measuring Instrument Audio distortion meter
2) Set the Hi-Fi SOUND switch (menu display) to O2�.
Specified ValueBelow 0.4%(200Hz to 6kHz BPF ON)
3) Select page: F, address: 7C, change the data and set the 1kHz
signal level to the specified value.
Checking Method:
4) Press the PAUSE button.
1) Input the 400Hz, �66dBs signal in the MIC jack left and right.
5) Set the Hi-Fi SOUND switch (menu display) to OSTEREO�.
2) Record the signal.
6) Select page: 0, address: 01, and set data: 00.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
5-56 |
ACEC
