Ir Audio Deviation Adjustment (Vc-214 Board) - Sony CCD-TR913E Service Manual

3. IR Audio Deviation Adjustment (VC-214 board)

Mode VTR recording
Signal Audio signal :
400Hz, –7.5dBs : L or R of AUDIO
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 ± 2.0 dBs
Level difference of L and R: Below 2dB
Connection of Equipment
Connect the measuring device as shown in the following figure,
and adjust.
Preparations only for the model without REC switch:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: 14, after memorizing the data, set the
bit value of bit1 to "1". (Refer to "4-3, 3. Bit value
discrimination" of "5-4. Service Mode").
3) Select page: D, address: 15, after memorizing the data, set the
bit value of bit7 to "0".
4) Insert a tape, and set to recording mode. (Use the wireless
remote commander of 8mm VCR.)
Pattern generator
VIDEO OUT
Ω
(75 )
Audio oscillator
Attenuator
terminal
Ω
600
Ω Ω
600 (270 (1-249-410-11) + 330
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: F, address: 67, 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.
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
2) of "Preparations only for the model without REC switch".
3) Press the PAUSE button of the adjustment remote commander.
4) Select page: D, address: 15, and set the data memorized at step
3) of "Preparations only for the model without REC switch".
5) Press the PAUSE button.
6) Select page: 0, address: 01, and set data: 00.
Main unit
Video
L
Audio
R
Ω
(1-249-411-11))
Fig. 5-3-18.
5-42
IR receiver jig
AUDIO OUT
L R
Audio level meter
Ω
47k
Ω
47k (1-249-437-11)