Ir Audio Deviation Adjustment (Vc-253 Board) - Sony DCR-PC110 Service Manual

3. IR Audio Deviation Adjustment (VC-253 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 47kΩ)
Measuring Instrument Audio level meter
Adjustment Page F
Adjustment Address 6C
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:
Order Page Address Data
1 0 01 01
2
3 F 6C
4 F 6C
5
6 F 6C
7 0 01 00
Video
(Yellow)
Attenuator
600 Ω
600 Ω : 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
Procedure
Set the data.
Connect the audio level meter to
the AUDIO L terminal of the IR
receiver jig.
Change the data and set the
400Hz audio signal level to the
specified value.
Press PAUSE button.
Connect the audio level meter to
the AUDIO R terminal of the IR
receiver jig.
Check that the 400Hz audio
signal level is within the
specified value. If outside, repeat
from step 2.
Set the data.
Main unit
AUDIO/
VIDEO
Audio Left
(White)
Audio Right
(Red)
47k Ω (1-249-437-11)
Fig. 5-3-14.
5-50
IR receiver jig
AUDIO OUT
L R
Audio level meter
47k Ω