Sony DCR-TRV240 Service Manual page 152

2. Hi8/Standard8 AFM 1.5 MHz Deviation Adjustment
(VC-276 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)
Measurement Point AUDIO/VIDEO jack left or right
Measuring Instrument Audio level meter
Adjustment Page C
Adjustment Address 4C
Specified Value –7.5 ± 2.0dBs
Note: The data of page: 0, address: 10 must be "00".
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: C, address: 4C, 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-276 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)
Measurement Point AUDIO/VIDEO jack left or right
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 4D
Specified Value –7.5 ± 2.0dBs
Note: The data of page: 0, address: 10 must be "00".
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: C, address: 4D, 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
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Check that the playback signal level is the specified value.
5. Overall Level Characteristics Check
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400Hz, –66dBs signal in the MIC jack left and right.
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
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400Hz, –66dBs signal in the MIC jack left and right.
2) Record the signal.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
5-51
DCR-TRV240/TRV340
Playback
Digital8 alignment tape:
For audio operation check
(WR5-3ND)
AUDIO/VIDEO jack left or right
Audio level meter and frequency
counter
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.
Recording and playback
400Hz, –66dBs signal: MIC jack left
and right
AUDIO/VIDEO jack left or right
Audio level meter
–7.5 ± 3.0dBs
Recording and playback
400Hz, –66dBs signal: MIC jack left
and right
AUDIO/VIDEO jack left or right
Audio distortion meter
Below 0.4%
(200Hz to 6kHz BPF ON)