Audio System Adjustments; Playback Level Check; Overall Level Characteristics Check; Overall Distortion Check - Sony Handycam DCR-PC1 Service Manual

3-6.

AUDIO SYSTEM ADJUSTMENTS

[Connection of Audio System Measuring Devices]
Connect the audio system measuring devices as shown in Fig. 5-3-
8.
Recording (Camera mode)
Audio
600 Ω
oscillator
Attenuator
600 Ω : 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
Playback (VTR mode)
Main unit
Left (White)
AUDIO/
VIDEO/ Right
HEAD-
(Red)
PHONES
OUT
47k Ω (1-249-437-11)
Fig. 5-3-8
Main unit
MIC
Left
Right
Monitor TV
Video (Yellow)
Audio level meter
47k Ω
or Distortion meter
47k Ω

1. Playback Level Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Check that the playback signal level is the specified value.

2. Overall Level Characteristics Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 1kHz, –66 dBs signal into L- and R-ch of the MIC
jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the L- and R-ch signal levels of AUDIO/VIDEO/
HEADPHONES OUT are the specified value.

3. Overall Distortion Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 1kHz, –66 dBs signal into L- and R-ch of the MIC
jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that L- and R-ch signal levels of AUDIO/VIDEO/
HEADPHONES OUT are the specified value.
5-44
VTR playback
Alignment tape:
For audio operation check
(XH5-3 (NTSC), XH5-3P (PAL))
AUDIO/VIDEO/HEADPHONES
terminal, R- and L-channels (across
47 kΩ load)
Audio level meter and frequency
counter
32 kHz mode: 1 kHz, +3 ± 2 dBs
48 kHz mode: 1 kHz, +3 ± 2 dBs
44.1 kHz mode:
The 7.35kHz signal level during
EMPH ON is –6 ± 2 dB from the
signal level during EMPH OFF
Camera recording and playback
1kHz, –66 dBs signal: MIC jack left
and right
AUDIO/VIDEO/HEADPHONES
terminal, R- and L-channels (across
47 kΩ load)
Audio level meter
–7.5 ± 3.0 dBs
Camera recording and playback
1kHz, –66 dBs signal: MIC jack left
and right
AUDIO/VIDEO/HEADPHONES
terminal, R- and L-channels (across
47 kΩ load)
Audio distortion meter
Below 0.4 %
(200 Hz to 6 kHz BPF ON)