Afc Fo Adjustment (Vc-251 Board); Filter Fo Adjustment (Vc-251 Board) - Sony CCD-TR618 Service Manual

2. AFC fo Adjustment (VC-251 board)

Adjust the pull-in range of the A/D converted clock generator during
playback.
Mode VTR stop
Signal No signal
Adjustment Page F
Adjustment Address 65
Adjusting method:
Order Page Address Data
1 0 01 01
2 F 65 50
3 2 01 4D
4
5 6 01 C5
6 6 02
7 2 01 00
8 6 01 00
9 0 01 00
Note: The adjustment data will be automatically input to page: F, address:
65.
Procedure
Set the data.
Set the data, and press PAUSE
button.
Set the data, and press PAUSE
button.
Wait for 0.5 sec.
Set the data, and press PAUSE
button.
Check that the data changes to
"01". (Note)
Set the data, and press PAUSE
button.
Set the data, and press PAUSE
button.
Set the data.

3. Filter fo Adjustment (VC-251 board)

Adjust the fo frequency of the IC151 built-in filter.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 2 01
3 2 05
4 F 66
5 F 66
6 2 01
7 2 05
8 0 01
5-42
VTR stop
No signal
IR VIDEO (Pin qf of CN713 or Pin
qf of CPC connector of FP-262
flexible)
Oscilloscope
F
66
Minimum residual chroma signal
components (A= Bellow 35mV)
Procedure
01 Set the data.
4F Set the data, and press PAUSE
button.
40 Set the data,.
Change the data and minimize
the residual chroma signal
components (A).
(The data should be "70" to
"7F".)
Press PAUSE button.
00 Set the data, and press PAUSE
button.
00 Set the data,.
00 Set the data.
H
Fig. 5-3-6.
A