Sony DCR-TRV230 Service Manual page 188

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.
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.
5-57
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