Sony BVW-55 Maintenance Manual page 365

(4) Turn the tracking VR (RV100) so that the
output level of the center portion of RF
envelope waveform is maximized.
(5) Turn the tracking VR (RV100) clockwise so
that the center portion of the RF envelope
waveform makes 80% of its maximum output
level.
(6) At the state of (5), check that the RF enve-
lope waveform satisfies specification 1.
n
If the level fluctuates, read the average level.
(7) If the level fluctuates, turn the tracking VR
(RV100) on the SV-206 board so that the
output level in the center portion of the RF
envelope waveform is maximized, and check
that the fluctuation amounts satisfy the
specification 2.
If specifications 1 and 2 are not satisfied, perform
the adjustment (at the Drum Entrance Side or the
Drum Exit Side) in steps 19 and later.
12. F. FWD and REV modes
(1) Press the PLAY button to play back the
CR2-1B.
(2) Put the unit into the F. FWDx5 mode and
check that the RF waveform satisfies the
specification 3.
(3) Put the unit into the REVx5 mode and check
that the RF waveform satisfies the specifica-
tion 3.
If specification 3 is not satisfied in each mode,
perform the adjustment (at the Drum Entrance
Side or the Drum Exit Side) in steps 19 and later.
13. REVx x x x x 10 mode to PLAY mode
(1) Press the PLAY button to play back the
CR2-1B.
(2) Put the unit into the REVx10 mode once.
Three seconds later, put the unit into the
PLAY mode again.
Check that the RF envelope waveform
returns to the maximum level with the even
level. (Specification 4)
(3) Repeat changing the mode REVx10 to
PLAY three times, check that the waveform
satisfies the specification 4 on every time.
14. Adjust the drum PG phase
(Refer to Section 6-2-1.)
BVW-55 P2
. Alignment tape : CR2-1B
(D109 Lit)
Spec.1: The output level of the waveform should be more than 80 %
of the maximum value.
B C
> 0.8
A , A
Spec.2: The fluctuation value in each portion of a waveform should be
less than 10 %.
F G
> 0.9
E , H
. Alignment tape : CR2-1B
(D109 Dark)
A
B
Spec. 3:
. Alignment tape : CR2-1B
(D109 Dark)
Spec.4 Returning with even level.
[Drum entrace side]
(NG)
5-5. Video Tracking Check and Adjustment
D
> 0.8 > 0.8
, A
I
> 0.9 > 0.9
, J
A
B
B
x 100 > 80 %
A
(OK)
[Drum exit side]
(NG)
5-23