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3. IR Audio Deviation Check (VC-262 board)
Mode
VTR stop
Signal
Video : No signal
Audio : 400Hz, –7.5dBs, Audio left
and right terminal of AUDIO/VIDEO
jack
Measurement Point
AUDIO L terminal and AUDIO R
terminal of IR receiver jig
(Terminated at 47k
Ω
)
Measuring Instrument
Audio level meter
Specified Value
Signal level: –7.5 ± 2.5 dBs
Level difference of L and R: Below 2dB
Connection of Equipment:
Connect the measuring device as shown in the following figure,
and adjust.
Adjusting method:
Order Page Address Data
Procedure
1
Connect the audio level meter to
the AUDIO L terminal of the IR
receiver jig.
2
Check that the 400Hz audio signal
level is within the specified value.
3
Connect the audio level meter to
the AUDIO R terminal of the IR
receiver jig.
4
Check that the 400Hz audio signal
level is within the specified value.
Main unit
Audio oscillator
Audio Left
(White)
Video
(Yellow)
Audio Right
(Red)
Attenuator
AUDIO/VIDEO
IR receiver jig
AUDIO OUT
L
R
Audio level meter
47k
Ω
600
Ω
600
Ω
: 270
Ω
(1-249-410-11) + 330
Ω
(1-249-411-11)
47k
Ω
(1-249-437-11)
Fig. 5-3-16.