Sony AV-3600 Service Manual page 23

13.
Tighten the
two
bolts alternately,
applying torque
gradually
until all
are tight.
14.
Tighten
the
brush
pressure adjusting screws to
obtain a 2
mm
bend (approximately)
as
shown
in Fig. 4-7a.
Inspect the
brush and
slip-ring
assembly to
make
sure
that the brushes are
centered
in
the
slip rings.
Video
Head
Dihedral
Adjustment
Normally,
if
the video
heads have been
replaced
according to the foregoing procedure,
dihedral
need
not
be
adjusted. If
the dihedral setting has
been
disturbed,
however, or readjustment
is
otherwise
indicated,
proceed as follows.
The two
video
heads should be
displaced exactly
180° apart
measured
at
the
head
gap.
If
they
are not,
tape
inter
changeability
can not be maintained.
Video
Head
B
(not
A) should be adjusted so that
it is
correctly aligned
with
respect to
Video
Head
A.
This adjustment requires the
use of the
SONY
Alignment Tape
and the four adjusting
screws
shown
in Fig.
4-7b.
The
adjusting
screw has
a
tapered
head which bears against the base of the
head
when
turned clockwise,
thus forcing the head
to
move
laterally.
The
thread of
this
screw
is dif-
ferent
from
that
of
any other conventional
screw.
CAUTION
Do
not
use conventional screws for the dihedral
adjustment
as
damage
to the thread in the
head
beam
will result.
Adjusting screws
for
the video head
are
available for
all
AV-Series Videocorders.
Proceed
as follows:
1.
Thread
a
SONY
Alignment
Tape
onto the
Video
corder.
2.
Play
back
the tape with
a
monitor
connected.
norma/ abnormal
/
fSflf
poor
good
very
good
Fig. 4-7c.
Picture detail for dihedral
adjustment
4-fi