Service manual

5-57
3. IR Audio Deviation Adjustment (VC-215 board)
Mode VTR recording
Signal Audio signal :
400Hz, –7.5dBs : AUDIO terminal
Video signal :
Color bar signal : VIDEO terminal
Measurement Point AUDIO terminal of IR receiver jig
( Terminated at 47kΩ)
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.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Connect the audio level meter to the AUDIO 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) Select page: 0, address: 01, and set data: 00.
Fig. 5-3-20.
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
Audio
IR receiver jig
AUDIO OUT
Audio level meter
47k
Ω
47k Ω (1-249-437-11)