Ir Audio Deviation Adjustment (Vc-195 Board) - Sony Handycam CCD-TR57 Service Manual

3. IR Audio Deviation Adjustment (VC-195 board)

Mode VTR recording
Signal Audio signal :
400Hz, –7.5dBs : L or R of AUDIO
terminal
Video signal :
Color bar signal : VIDEO terminal
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 67
Specified Value Signal level: –7.5±2.0dBs
Connection of Equipment
Connect the measuring device as shown in the following figure,
and adjust.
Preparations only for the model without REC switch:
1) Select page: 0, address: 01, and set data: 01.
3) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to "1". (Refer to "3. Bit value discrimination" of
"3-1-8. Service Mode").
4) Select page: D, address: 15, after memorizing the data , set the
bit value of bit7 to "0".
5) Turn off the HOLD switch of the adjusting remote commander,
and press the REC buttons and set to recording mode.
Pattern generator
VIDEO OUT
(75 Ω )
Audio oscillator
Attenuator
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
3) Select page: F, address: 67, change the data and set the 400Hz
4) Press the PAUSE button of the adjusting remote commander.
5) Connect the audio level meter to the AUDIO R terminal of the
6) Check that the 400Hz audio signal level is within the specified
7) Select page: 0, address: 01, and set data: 00.
Processing after completed adjustment: only for the model without
REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, and set the data memorized at step
3) Press the PAUSE button of the adjusting remote commander.
4) Select page: D, address: 15, and set the data memorized at step
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: 0, address: 01, and set data: 00.
Main unit
Video
L
600 Ω
R
Fig. 5-3-21.
5-47
IR receiver jig.
audio signal level to the specified value.
IR receiver jig.
value. If outside, repeat from step 2).
3) of "Preparations only for the model without REC switch".
4) of "Preparations only for the model without REC switch".
Audio
Audio level meter
47k Ω
47k Ω (1-249-437-11)
IR receiver jig
AUDIO OUT
L R