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5-47
3. IR Audio Deviation Adjustment (VC-195 board)
Mode
VTR recording
Signal
Audio signal :
400Hz, –7.5dBs : L or R of AUDIO
terminal
terminal
Video signal :
Color bar signal : VIDEO terminal
Measurement Point
AUDIO L terminal and AUDIO R
terminal of IR receiver jig
( Terminated at 47k
terminal of IR receiver jig
( Terminated at 47k
Ω
)
Measuring Instrument
Audio level meter
Adjustment Page
F
Adjustment Address
67
Specified Value
Signal level: –7.5
±
2.0dBs
Connection of Equipment
Connect the measuring device as shown in the following figure,
and adjust.
Connect the measuring device as shown in the following figure,
and adjust.
Preparations only for the model without REC switch:
1) Select page: 0, address: 01, and set data: 01.
3) Select page: D, address: 14, after memorizing the data, set the
1) Select page: 0, address: 01, and set data: 01.
3) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to “1”. (Refer to “3. Bit value discrimination” of
“3-1-8. Service Mode”).
“3-1-8. Service Mode”).
4) Select page: D, address: 15, after memorizing the data , set the
bit value of bit7 to “0”.
5) Turn off the HOLD switch of the adjusting remote commander,
and press the REC buttons and set to recording mode.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Connect the audio level meter to the AUDIO L terminal of the
1) Select page: 0, address: 01, and set data: 01.
2) Connect the audio level meter to the AUDIO L terminal of the
IR receiver jig.
3) Select page: F, address: 67, change the data and set the 400Hz
audio signal level to the specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Connect the audio level meter to the AUDIO R terminal of the
5) Connect the audio level meter to the AUDIO R terminal of the
IR receiver jig.
6) Check that the 400Hz audio signal level is within the specified
value. If outside, repeat from step 2).
7) Select page: 0, address: 01, and set data: 00.
Processing after completed adjustment: only for the model without
REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, and set the data memorized at step
REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, and set the data memorized at step
3) of “Preparations only for the model without REC switch”.
3) Press the PAUSE button of the adjusting remote commander.
4) Select page: D, address: 15, and set the data memorized at step
4) Select page: D, address: 15, and set the data memorized at step
4) of “Preparations only for the model without REC switch”.
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: 0, address: 01, and set data: 00.
6) Select page: 0, address: 01, and set data: 00.
Fig. 5-3-21.
Pattern generator
Audio oscillator
VIDEO OUT
(75
Ω
)
Attenuator
600
Ω
600
Ω
(270
Ω
(1-249-410-11) + 330
Ω
(1-249-411-11))
Video
Main unit
L
R
Audio
IR receiver jig
AUDIO OUT
L
R
Audio level meter
47k
Ω
47k
Ω
(1-249-437-11)
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