Sony CCD-TRV66PK, Service Manual

Page: 117 / 158

5-41
9. REC C Current Adjustment (VC-214 board)
Set the recording current levels of the REC Chroma signal. If it is
too low, chroma signal noise in played back picture will increased.
If too high, Y signal noises will increase and white modulation noises
will be produced.
Mode VTR recording (SP mode)
Signal No signal
Measurement Point Pin
!º
of CN910 (REC RF)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 85
Specified Value A=34.6 ± 1.2mV
Connection:
1)
Remove C085 (0.01
µ
F, Pin
!§
of IC202).
Note:
After completing “REC L Level Adjustment” and “REC C
Current Adjustment”, replace C085 with new parts (1-162-970-
11 CERAMIC CHIP 0.01
µ
F 10% 25V).
2) Connect Pin
$∞
of IC001 and GND with a 0.01F capacitor.
0.01
µ
F capacitor: 1-101-004-00
Adjusting method:
1)
Insert a tape, and set to recording mode.
2) Select page: 0, address: 01, and set data: 01.
3) Select page: 2, address: 01, set data: 41, and press the PAUSE
button of the adjustment remote commander.
4) Select page: 6, address: 61, and set data: 30.
5) Select page: F, address: 85, change the data and set the REC
chroma signal level (A) to the specified value.
6) Press the PAUSE button of the adjustment remote commander.
7) Select page: 6, address: 61, and set data: 10.
8) Select page: 2, address: 01, set data: 00, and press the PAUSE
button of the adjustment remote commander.
9) Select page: 0, address: 01, and set data: 00.
A
1.35
µ
sec
Center of the luminance line width
Fig. 5-3-14.