Sony CCD-TRV312 Operating Instructions (primary manual), Service Manual, Page: 205 / 212

6-80
4-6. OVERALL SIGNAL LEVEL, DISTORTION
AND SEPARATION CHECK
Mode CAM-REC and playback
Signal
1
CN501 pin
4
:400Hz, –38dBs
CN501 pin
2
: No signal
*
2
CN501 pin
4
:No signal
CN501 pin
2
:400Hz, –38dBs
Measurement Point AUDIO output terminal (Left)
*AUDIO output terminal (Right)
Measurement Instrument Audio level meter and distortion
meter
Specification Value Signal level
(Note)
1
Left output : –7.5
±
2dBs
Right output : –27.5dBs or less
*
2
Left output : –27.5dBs or less
Right output : –7.5
±
2dBs
Distortion
Left/Right output : 0.8% or less
Note 1 :
The value when band-pass filter of 200Hz to 6kHz is used.
Note 2 : Asterisk marks (*) are used in STEREO model.
Check procedure:
4-7. OVERALL NOISE LEVEL CHECK
Purpose :
Checks noise level.
Mode CAM-REC and playback
Signal No signal : VC-188 board CN501
(Note)
Measurement Point AUDIO output terminal (Left/Right)
Measuring Instrument Audio level meter
(using IHF-A curve weighting filter)
Specification Value –65dBs or less
Note :
Before making short circuit between CN501 pin
3
and pin
4
, pin
3
and pin
2
(STEREO model only), remove the
flexible board from CN501
Check procedure:
Order Procedure
1 Insert a shorting to pin
3
and pin
4
, pin
3
and pin
2
(STEREO model only) as CN501.
2 Make recording.
3 Remove the shorting plug.
4 Playback the recorded segment.
5 Confirm that the noise level at audio output terminal
(Left/Right) is –65dBs or less.
Order Procedure
1 Input 400Hz, –38dBs signal to CN501 pin
4
. Short pin
2
and
3
of CN501.
2 Check that the right and left channels of AUDIO output terminal satisfy the specification
1
.
Check that distortion satisfies the specification.
*3 Input 400Hz, –38dBs signal to CN501 pin
2
. Short pin
3
and
4
of CN501.
*4 Check that the right and left channels of AUDIO output terminal satisfy the specification
2
.
Check that distortion satisfies the specification.
200Hz 6kHz
18dB/OCT 18dB/OCT