Y Fm Carrier Frequency Adjustment (Va-68 Board); 10-5-10, Y Fm Deviation Adjustment (Va-68 Board) - Sony Video8 CCD-F501 Service Manual

10-5-8. Y FM Carrier Frequency Adjustment
(VA-68 Board)
Mode Recording
Signal No signal
Measurement Point R158 side terminal of RV101
Measuring Instrument | Frequency counter
Adjusting Element RV207
Specified Value 4.38 + 0.04 MHz
Adjusting method:
1) Adjust RV207 for 4.38 + 0.04 MHz.
2) Perform "Y FM Deviation Adjustment".
3) Make this adjustment again after completing "Y FM
Deviation Adjustment".
Approx.
0.3 Vp-p
ZL
0.228 usec
Fig. 10-17.
10-5-10. Y FM Deviation Adjustment (VA-68 Board)
Mode Recording and playback
Signal Color bar
Measurement Point VIDEO IN/OUT terminal (J201)
Measuring Instrument | Oscilloscope
Adjusting Element RV206
Specified Value Playback level is 1.00 + 0.05 Vp-p
Note: 1) Confirm that "Emphasis Y Level Adjustment", "PB Y
Level Adjustment" and "Y FM Carrier Frequency
Adjustment" have been completed.
2) Terminate VIDEO IN/OUT terminal (J201) at 75Q.
Adjusting method:
1) Record the color bar signal.
2) Playback the recorded signal.
3) Confirm the playback output.
Specified value: 1.00 + 0.05 Vp-p
4) If not meet the specified value, repeat 1) to 3) after tuning
RV206 in the following manner.
Rotation direction of RV206
When larger than . .
| specified value | Clockwise (QO)
When smaller than ;
specified value Counterclockwise (OQ)
Table 10-2,
a White (100%)
1.00 + 0.05 Vp-p
Fig. 10-18. Y FM deviation adjustment
— 800 —