Sony GV-D200E, Руководство по обслуживанию

Страница: 122 / 166

5-32
2. Hi8/Standard8 AFM 1.5 MHz Deviation Adjustment
(VC-250 board)
Adjust to the optimum 1.5MHz audio FM signal deviation.
If the adjustment is not correct, its playback level will differ from
that of other units.
Mode Playback
Signal Hi8/Standard8 alignment tape:
For checking AFM stereo operation
Monoscope section
(WR5-9NS (NTSC))
(WR5-9CS (PAL))
Measurement Point AUDIO OUT jack LEFT or RIGHT
Measuring Instrument Audio level meter
Adjustment Page F
Adjustment Address 7B
Specified Value –7.5 ± 2.0dBs
Adjusting method:
1)
Select page: 0, address: 01, and set data: 01.
2) Set the Hi-Fi SOUND switch (menu display) to “1”.
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) Set the Hi-Fi SOUND switch (menu display) to “STEREO”.
6) Select page: 0, address: 01, and set data: 00.
3. Hi8/Standard8 AFM 1.7 MHz Deviation Adjustment
(VC-250 board)
Adjust to the optimum 1.7MHz audio FM signal deviation.
If improper, this causes deteriorated separation (with stereo signal).
Mode Playback
Signal Hi8/Standard8 alignment tape:
For checking AFM stereo operation
Monoscope section
(WR5-9NS (NTSC))
(WR5-9CS (PAL))
Measurement Point AUDIO OUT jack LEFT or RIGHT
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 7C
Specified Value –7.5 ± 2.0dBs
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: 7C, change the data and set the 1kHz
signal level to the specified value.
4) Press the PAUSE button.
5) Set the Hi-Fi SOUND switch (menu display) to “STEREO”.
6) Select page: 0, address: 01, and set data: 00.
4. Digital8 Playback Level Check
Mode Playback
Signal Digital8 alignment tape:
For audio operation check
(WR5-3ND (NTSC))
(WR5-3CD (PAL))
Measurement Point AUDIO OUT jack LEFT or RIGHT
Measuring Instrument Audio level meter and frequency
counter
Specified Value 32 kHz mode: 1 kHz, +3.0 ± 2.0dBs
48 kHz mode: 1 kHz, +3.0 ± 2.0dBs
44.1 kHz mode:
The 7.35kHz signal level during EMP
OFF is +2.0 ± 2.0dBs.
The 7.35kHz signal level during EMP
ON is –6 ± 2 dB from the signal level
during EMP OFF.
Checking Method:
1)
Check that the playback signal level is the specified value.
5. Overall Level Characteristics Check
Mode Recording and playback
Signal 400Hz, –7.5dBs signal: Audio
terminal left and right of AUDIO/
VIDEO INPUT jack
Measurement Point AUDIO OUT jack LEFT or RIGHT
Measuring Instrument Audio level meter
Specified Value –7.5 ± 3.0dBs
Checking Method:
1)
Input the 400Hz, –7.5dBs signal in the audio terminal left and
right of AUDIO/VIDEO INPUT jack.
2) Record the signal.
3) Playback the recorded section.
4) Check that the 400Hz signal level is the specified value.
6. Overall Distortion Check
Mode Recording and playback
Signal 400Hz, –7.5dBs signal: Audio
terminal left and right of AUDIO/
VIDEO INPUT jack
Measurement Point AUDIO OUT jack LEFT or RIGHT
Measuring Instrument Audio distortion meter
Specified Value Below 0.4%
(200Hz to 6kHz BPF ON)
Checking Method:
1)
Input the 400Hz, –7.5dBs signal in the audio terminal left and
right of AUDIO/VIDEO INPUT jack.
2) Record the signal.
3) Playback the recorded section.
4) Check that the distortion is the specified value.