Ir Audio Deviation Adjustment (Cb-61 Board) - Sony GV-D300 Service Manual

3. IR Audio Deviation Adjustment (CB-61 board)

Mode VTR stop
Signal 400Hz, –7.5dBs :
Color bar : VIDEO jack
Measurement Point AUDIO L terminal and AUDIO R
terminal of IR receiver jig
(Terminated at 47kΩ)
Measuring Instrument Audio level meter
Adjustment Page D
Adjustment Address 92
Specified Value Signal level: –7.5 ± 1.0 dBs
Level difference of L and R: Below 2dB
Connection of Equipment:
Connect the measuring device as shown in the following figure,
and adjust.
Audio oscillator
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Only for the model without LCD screen, select page: D, address:
19, after noting down data, set data: 01, and press the PAUSE
button of the adjustment remote commander.
3) Connect the audio level meter to the AUDIO L terminal of the
IR receiver jig.
4) Select page: D, address: 92, change the data and set the 400Hz
audio signal level to the specified value.
5) Press the PAUSE button of the adjustment remote commander.
6) Connect the audio level meter to the AUDIO R terminal of the
IR receiver jig.
7) Check that the 400Hz audio signal level is within the specified
value. If outside, repeat from step 2).
8) Only for the model without LCD screen, select page: D, address:
19, set data noted down at step 2), and press the PAUSE button
of the adjustment remote commander.
9) Select page: 0, address: 01, and set data: 00.
AUDIO jack left and right
Attenuator
600 Ω
600 Ω : 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
Main Unit
AUDIO
L
R
47k Ω
47k Ω (1-249-437-11)
Fig. 5-3-23
5-30
IR receiver jig
AUDIO OUT
L
R
Audio level meter