Ir Audio Deviation Adjustment (Mi-37 Board) - Sony DCR-TRV120 Service Manual

3. IR Audio Deviation Adjustment (MI-37 board)

Mode VTR stop
Signal Audio signal:
Video signal:
Measurement Point AUDIO L terminal and AUDIO R
terminal of IR receiver jig
(Terminated at 47 kΩ)
Measuring Instrument Audio level meter
Adjustment Page F
Adjustment Address 7F
Specified Value Signal level: –7.5 ± 1.0 dBs
Level difference of L and R: Below 2 dB
Note: TR model: DCR-TR8000E/TR8100E
Connection of Equipment
Connect the measuring device as shown in the following figure,
and adjust.
Pattern generator
VIDEO OUT
(75 Ω)
Audio oscillator
Attenuator
400 Hz, –7.5 dBs: Audio left and
right terminal of A/V jack
Color bar signal: VIDEO terminal
of A/V jack
Video
Audio (L)
600 Ω
Audio (R)
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) Only for the TR model (Note), Select page: D, address: 20, 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: F, address: 7F, change the data and set the 400 Hz
audio signal level to the specified value.
5) Press the PAUSE button.
6) Connect the audio level meter to the AUDIO R terminal of the
IR receiver jig.
7) Check that the 400 Hz audio signal level is within the specified
value. If outside, repeat from step 3).
8) Only for the TR model (Note), Select page: D, address: 20, set
data: 00, and press the PAUSE button.
9) Select page: 0, address: 01, and set data: 00.
Main unit
A/V jack
Fig. 5-3-17
5-51
IR receiver jig
AUDIO OUT
L
R
Audio level meter
47 kΩ
47 kΩ (1-249-437-11)