Read Sony DCR-TRV738E / DCR-TRV740 / DCR-TRV740E / DCR-TRV840 (serv.man2) Service Manual online
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DCR-TRV738E/TRV740/TRV740E/TRV840
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)
(IHF-A filter ON, 20kHz LPF ON)
Checking Method:
1)
1)
Connect the left terminal of MIC jack and its ground terminal
with a jumper wire.
with a jumper wire.
2)
Connect the right terminal of MIC jack and its ground terminal
with a jumper wire.
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
Recording and playback
Signal
No signal: MIC jack <left> [right]
400Hz, –66dBs signal: MIC jack
<right> [left]
400Hz, –66dBs signal: MIC jack
<right> [left]
Measurement Point
AUDIO/VIDEO jack <left> [right]
Measuring Instrument
Audio level meter
Specified Value
Below –40dBs
< >: Left channel check
[ ]: Right channel check
[ ]: Right channel check
Checking Method:
1)
1)
Connect the <left> [right] terminal of MIC jack and its ground
terminal with a jumper wire.
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.
[right] is the specified value.
6)
Remove the jumper wire.
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