5-31
3-7. AUDIO SYSTEM ADJUSTMENTS
• Perform the adjustment using the color bar signal as a video signal
input for the VIDEO jack.
[Connection of Audio System Measuring Devices]
Connect the audio system measuring devices as shown in Fig. 5-3-24.
Fig. 5-3-24.
1. Playback Level Check
Mode
Playback
Signal
Alignment tape:
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
Measurement Point
AUDIO jack left or right
Measuring Instrument
Audio level meter and frequency
counter
Specified Value
32 kHz mode: 1 kHz, +3.0 ± 2.0dBs
48 kHz mode: 1 kHz, +3.0 ± 2.0dBs
44.1 kHz mode EMP OFF section:
7.35kHz +2.0 ± 2.0dBs.
44.1 kHz mode EMP ON section:
–6 ± 2 dB from the signal level
during EMP OFF.
Checking Method
1)
Check that the playback signal level is the specified value.
2. Overall Level Characteristics Check
Mode
Recording and playback
Signal
400Hz, –7.5dBs signal: AUDIO jack
left and right
Measurement Point
AUDIO jack left or right
Measuring Instrument
Audio level meter
Specified Value
–7.5 ± 3.0dBs
Checking Method
1)
Input the 400Hz, -7.5dBs signal in the AUDIO jack left and
right.
2)
Record the signal.
3)
Playback the recorded section.
4)
Check that the 400Hz signal level is the specified value.
3. Overall Separation Check
Mode
Recording and playback
Signal
400Hz, –7.5dBs signal: AUDIO jack
<right> [left]
(Insert a shorting plug to AUDIO jack
<left> [right])
Measurement Point
AUDIO jack <left> [right]
Measuring Instrument
Audio level meter
Specified Value
Below –40dBs
(IHF-A filter ON)
< >: Left channel check
[ ] : Right channel check
Checking Method
1)
Input the 400Hz, –7.5dBs signal in the AUDIO jack <right>
[left] only. (Insert a shorting plug to AUDIO jack <left> [right])
2)
Record the signal.
3)
Playback the recorded section.
4)
Check that the signal level of the AUDIO jack <left> [right] is
the specified value.
VIDEO
L
R
AUDIO
VIDEO OUT
(75
Ω
)
Pattern generator
Main unit
Audio generator
Attenuator
600
Ω
600
Ω
: 270
Ω
(1-249-410-11) + 330
Ω
(1-249-411-11)
L
R
AUDIO
VIDEO
Main unit
Monitor TV
47k
Ω
47k
Ω
47k
Ω
(1-249-437-11)
Audio level meter
or distortion meter
Recording
Playback
Содержание GV-D300 Operating Instructions (primary manual)
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Страница 30: ...2 3 2 4 CB 61 RJ 77 BOARDS 2 5 CONTROL SWITCH BLOCK FK 71 ...
Страница 33: ...2 6E 2 12 CIRCUIT BOARDS LOCATION ...
Страница 45: ...GV D300 D300E D900 D900E 4 29 4 30 4 31 AUDIO 1 CB 61 6 10 Refer to page 4 7 for CB 61 printed wiring board ...
Страница 46: ...GV D300 D300E D900 D900E 4 33 4 34 AUDIO 2 CB 61 7 10 4 32 Refer to page 4 7 for CB 61 printed wiring board ...
Страница 59: ...GV D300 D300E D900 D900E 4 81 4 82 MODE CONTROL RJ 77 9 9 See page 4 48 for RJ 77 BOARD printed wiring board ...
Страница 61: ...GV D300 D300E D900 D900E 4 85 4 86 4 87 AV IN OUT IO 62 4 88 ...
Страница 62: ...GV D300 D300E D900 D900E 4 89 4 90 4 91 4 92 MULTI CONNECTOR EX 34 ...
Страница 64: ...GV D300 D300E D900 D900E 4 96E CUSTOMER CONTROL CONTROL SW BLOCK FK 71 4 95 ...
Страница 142: ...3 BLOCK DIAGRAMS PAGE 3 3 3 1 OVERALL BLOCK DIAGRAM 1 2 PAGE 3 8 3 3 POWER BLOCK DIAGRAM ...
Страница 144: ...GV D300 D300E D900 D900E PAGE 4 89 SCHEMATIC DIAGRAM 5 6 MULTI CONNECTOR BACK LIGHT POWER EX 34 ...