Vertical Amplitude Adjustment (Vf-129 Board); Brightness Adjustment (Vf-129 Board) - Sony DCR-TRV120 Service Manual

1-4-6. Vertical Amplitude Adjustment (VF-129 board)

Mode Playback
Signal Hi8/standard 8 mm alignment tape :
For checking operation
(WR5-8NSE(NTSC))
(WR5-8CSE(PAL))
Monoscope section
Adjusting Element RV903
Specified Value 10 ± 3%
Adjustment method:
1) Adjust RV903 so that the vertical direction over scan becomes
10 ± 3% (Top and bottom totals).
5%
5%
Fig. 5-1-19
VF-129 BOARD
W901
RV904
F.B.T
16.5%
100%
16.5%
RV903
C909
SOL901
IC901
CN902

1-4-7. Brightness Adjustment (VF-129 board)

Mode
Signal
Adjusting Element
Adjustment method:
1) Rotate RV904, and adjust so that the bright/dark sections of
gray scale are displayed correctly. (The bright section should
be unsatisfactory till the cross hatch appears vague in the
monoscope circle. The dark section should be unsatisfactory
till the darkest section of the gray scale cannot be differentiate.)
1-4-8. Horizontal Amplitude, Vertical Amplitude, Focus
Check
"1-4-5. Horizontal Amplitude Adjustment" and "1-4-6. Vertical
Amplitude Adjustment" should be both satisfy the specified values.
If not, perform the adjustments from the beginning again. In this
case, perform "1-4-7. Brightness Adjustment" again.
Moreover, check the focus, and if it found to be vague, perform "1-
4-3. Focus Adjustment" and "1-4-4. Aberration Adjustment".
5-27
Playback
Hi8/standard 8 mm alignment tape :
For checking operation
(WR5-8NSE(NTSC))
(WR5-8CSE(PAL))
Monoscope section
RV904