Sony DCR-TRV738E Service Manual page 125

7. Overall Noise Level Check
Mode Recording and playback
Signal No signal: MIC jack left and right
Measurement Point AUDIO/VIDEO jack left or right
Measuring Instrument Audio level meter
Specified Value Below –45dBs
(IHF-A filter ON, 20kHz LPF ON)
Checking Method:
1) Connect the left terminal of MIC jack and its ground terminal
with a jumper wire.
2) Connect the right terminal of MIC jack and its ground terminal
with a jumper wire.
3) Record the signal.
4) Playback the recorded section.
5) Check that the noise level is the specified value.
6) Remove the jumper wires.
DCR-TRV738E/TRV740/TRV740E/TRV840
8. Overall Separation Check
Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
< >: Left channel check
[ ]: Right channel check
Checking Method:
1) Connect the <left> [right] terminal of MIC jack and its ground
terminal with a jumper wire.
2) Input the 400Hz, –66dBs signal in the MIC jack <right> [left].
3) Record the signal.
4) Playback the recorded section.
5) Check that the signal level of the AUDIO/VIDEO jack <left>
[right] is the specified value.
6) Remove the jumper wire.
5-59
Recording and playback
No signal: MIC jack <left> [right]
400Hz, –66dBs signal: MIC jack
<right> [left]
AUDIO/VIDEO jack <left> [right]
Audio level meter
Below –40dBs