Ir Audio Deviation Adjustment (Vi-151 Board) - Sony DCR-TRV890E Service Manual

3. IR Audio Deviation Adjustment (VI-151 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 C
Adjustment Address 2A
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
600 Ω : 270 Ω (1-249-410-11) + 330 Ω (1-249-411-11)
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
IR receiver jig.
3) Select page: C, address: 2A, change the data and set the 400Hz
audio signal level to the specified value.
4) Press the PAUSE button of the adjustment remote commander.
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.
Video
(Yellow)
Attenuator
600 Ω
Fig. 5-3-12.
5-54
Main unit
AUDIO/
VIDEO
Audio Left
(White)
Audio level meter
Audio Right
(Red)
47k Ω
47k Ω (1-249-437-11)
IR receiver jig
AUDIO OUT
L R