Read Sony DCR-HC28 (serv.man3) Service Manual online
6-44
DCR-HC28_ADJ
4.
Overall Noise Level Check
Mode
Recording (CAMERA mode) and
playback (PLAY/EDIT mode)
playback (PLAY/EDIT mode)
Signal
No signal:
Audio left and right terminal of A/V
OUT jack
Audio left and right terminal of A/V
OUT jack
Measurement Point
Audio left or right terminal of A/V
OUT jack
OUT jack
Measuring Instrument
Audio level meter
Specified Value
Below
−
45 dBs
(IHF-A filter ON, 20 kHz LPF ON)
Checking Method:
1) Select page: 7, address: 05, and set the bit value of bit 7 to “1”.
2) Connect the audio left terminal of A/V OUT jack to GND us-
1) Select page: 7, address: 05, and set the bit value of bit 7 to “1”.
2) Connect the audio left terminal of A/V OUT jack to GND us-
ing a jumper wire.
Connect the audio right terminal of A/V OUT jack to GND
using a jumper wire.
Connect the audio right terminal of A/V OUT jack to GND
using a jumper wire.
3) Record the signal.
4) Remove the jumper wires.
5) Playback the recorded section.
6) Check that the noise level is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
4) Remove the jumper wires.
5) Playback the recorded section.
6) Check that the noise level is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
5.
Overall Separation Check
Mode
Recording (CAMERA mode) and
playback (PLAY/EDIT mode)
playback (PLAY/EDIT mode)
Signal
400 Hz,
−
7.5 dBs signal:
Audio <right> [left] terminal of A/V
OUT jack
No signal:
Audio <left> [right] terminal of A/V
OUT jack
OUT jack
No signal:
Audio <left> [right] terminal of A/V
OUT jack
Measurement Point
Audio <left> [right] terminal of A/V
OUT jack
OUT jack
Measuring Instrument
Audio level meter
Specified Value
Below
−
40 dBs
< > : Left channel check
[ ] : Right channel check
[ ] : Right channel check
Checking Method:
1) Select page: 7, address: 05, and set the bit value of bit 7 to “1”.
2) Input the 400 Hz,
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 <right> [left]
terminal of A/V OUT jack.
Connect the audio <left> [right] terminal of A/V OUT jack to
GND using a jumper wire.
Connect the audio <left> [right] terminal of A/V OUT jack to
GND using a jumper wire.
3) Record the signal.
4) Remove the input signal, and remove the jumper wire.
5) Playback the recorded section.
6) Check that the signal level of the audio <left> [right] terminal
4) Remove the input signal, and remove the jumper wire.
5) Playback the recorded section.
6) Check that the signal level of the audio <left> [right] terminal
is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
3.
Overall Distortion 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
Audio left and right terminal of A/V
OUT jack
Measurement Point
Audio left or right terminal of A/V
OUT jack
OUT jack
Measuring Instrument
Audio distortion meter
Specified Value
Below 0.4%
(200 Hz to 6 kHz BPF ON)
(200 Hz to 6 kHz BPF ON)
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 distortion 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 distortion is the specified value.
7) Select page: 7, address: 05, and set the bit value of bit 7 to “0”.
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