Sony DSR-250, Service Manual

Page: 233 / 322

5-75
1. Playback Level Check
Mode VTR playback
Signal Alignment tape:
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio level meter and frequency
counter
Specified Value 32 kHz mode: 1 kHz, +8.2 ± 2.0dBs
48 kHz mode: 1 kHz, +8.2 ± 2.0dBs
44.1 kHz mode:
The 7.35kHz signal level during
EMP OFF is +8.2 ± 2.0dBs.
The 7.35kHz signal level during
EMP ON is –6.2 ± 2.0 dB from the
signal level during EMP OFF.
Menu setting:
A REF LEVEL ............................................... –20dB (NTSC)
................................................... –18dB (PAL)
Checking Method
1)
Check that the playback signal level is the specified value.
2. Overall Level Characteristics Check
Mode Camera recording and playback
Signal 400Hz, –60 dBs signal: XLR jack
CH1 and CH2
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio level meter
Specified Value –10 ± 3.0dBs
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1)
Input the 400Hz, –60dBs signal in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the 400Hz signal level is the specified value.
3. Overall Distortion Check
Mode Camera recording and playback
Signal 400Hz, –60dBs signal: XLR jack
CH1 and CH2
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio distortion meter
Specified Value Below 0.4%
(200Hz to 6kHz BPF ON)
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1)
Input the 400Hz, –60dBs signal in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
4. Overall Noise Level Check
Mode Camera recording and playback
Signal No signal: Insert a shorting plug in the
XLR jack
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio level meter
Specified Value Below –45dBs
(IHF-A filter ON, 20kHz LPF ON)
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1)
Insert a shorting plug in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the noise level is the specified value.
5. Overall Separation Check
Mode Camera recording and playback
Signal 400Hz, –60dBs signal: XLR jack
<CH2> [CH1]
(Insert a shorting plug in the XLR
jack <CH1> [CH2] )
Measurement Point Audio <CH1> [CH2] terminal of
AUDIO jack
Measuring Instrument Audio level meter
Specified Value Below –40dBs
< > : CH1 check
[ ] : CH2 channel check
Menu setting:
A REF LEVEL ............................................................. –12dB
\Checking Method
1)
Input the 400Hz, –60dBs signal in the <CH2> [CH1] terminal
of the XLR jack only.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the signal level of the audio <CH1> [CH2] terminal
is the specified value.