Read Sony DCR-HC28 (serv.man3) Service Manual online
6-43
DCR-HC28_ADJ
3-5.
AUDIO SYSTEM ADJUSTMENTS
[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to
the video system measuring instruments as shown in Fig. 6-3-6.
the video system measuring instruments as shown in Fig. 6-3-6.
Fig. 6-3-6
Audio
oscillator
Attenuator
600
Ω
600
Ω
(270
Ω
(1-249-410-11) +330
Ω
(1-249-411-11))
Main unit
Main unit
47 k
Ω
47 k
Ω
: 1-249-437-11
Audio level meter or
distortion meter
TV monitor
A/V OUT
jack
jack
Pattern generator
Video output
(75
(75
Ω
)
A/V OUT
jack
jack
(L)
(R)
Video
Audio (L)
Audio (R)
In Recording (CAMERA mode)
In Playback (PLAY/EDIT mode)
Audio
Video
Audio
1.
Playback Level Check
Mode
Playback (PLAY/EDIT mode)
Signal
Alignment tape:
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
(XH5-3 (NTSC))
(XH5-3P (PAL))
Measurement Point
Audio left or right terminal of A/V
OUT jack
OUT jack
Measuring Instrument
Audio level meter and frequency
counter
counter
Specified Value
32 kHz mode: 1 kHz, + 3.0
±
2.0 dBs
48 kHz mode: 1 kHz, + 3.0
±
2.0 dBs
44.1 kHz mode:
The 7.35 kHz signal level during EMP
OFF is +2.0
The 7.35 kHz signal level during EMP
OFF is +2.0
±
2.0 dBs.
The 7.35 kHz signal level during EMP
ON is
ON is
−
6
±
2 dB from the signal level
during EMP OFF.
Note:
NTSC model: DCR-HC28
PAL model: DCR-HC27E/HC28E
PAL model: DCR-HC27E/HC28E
Checking Method:
1) Check that the playback signal level is the specified value.
1) Check that the playback signal level is the specified value.
2.
Overall Level Characteristics Check
Mode
Recording (CAMERA mode) and
playback (PLAY/EDIT mode)
playback (PLAY/EDIT mode)
Signal
400 Hz,
−
7.5 dBs signal:
Audio left and right terminal of A/V
OUT jack
OUT jack
Measurement Point
Audio left or right terminal of A/V
OUT jack
OUT jack
Measuring Instrument
Audio level meter
Specified Value
–7.5
±
3.0 dBs
Checking Method:
1) Select page: 7, address: 05, and set the bit value of bit 7 to “1”.
2) Input the 400 Hz, –7.5 dBs signal in the audio left and right
1) Select page: 7, address: 05, and set the bit value of bit 7 to “1”.
2) Input the 400 Hz, –7.5 dBs signal in the audio left and right
terminal of A/V OUT jack.
3) Record the signal.
4) Remove the input signal.
5) Playback the recorded section.
6) Check that the 400 Hz signal level is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
4) Remove the input signal.
5) Playback the recorded section.
6) Check that the 400 Hz signal level is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
Click on the first or last page to see other DCR-HC28 (serv.man3) service manuals if exist.