Mechanical Maintenance; Cleaning Heads And Slip Rings; Lubrication; Service Center - Sony AV-3600 Service Manual

SECTION
4
MECHANICAL MAINTENANCE
4-1.
PRECAUTIONS
Machine compatibility (interchangeability of tapes
between
machines) depends
upon
very
close
mechan-
ical
tolerances in
the tape path.
The
tape
path
is
fac-
tory-adjusted
and
should
not require realignment
under
normal circumstances.
Do
not attempt
adjust-
ment of the tape guides
or the tapered guides.
If
mechanical
damage
requires
replacement and/or ad-
justment of the guides
in
the tape path, return the
unit
to a
SONY FACTORY
SERVICE
CENTER
for
repair.
4-2.
CLEANING HEADS
AND
SLIP
RINGS
Noise in the picture during
playback
is
usually
caused
by an accumulation of
debris in
the video
heads.
In
some
cases,
half the picture
may
be
noisy
(split
screen); in
severe cases,
video output
may
be
lost.
To clean the heads, stop the
machine,
remove
the
tape
and
move one
of the
heads
to the cleaning po-
sition
near the
left
tapered
guide.
See Fig.
4-1.
Fig. 4-1.
Video
head placed at the cleaning
position
CAUTION
NEVER TRY TO CLEAN
THE HEADS WITH
THE
MOTOR RUNNING
Saturate
a cleaning
tip
with
SONY
cleaning
fluid
or
methanol. (Spray cleaner,
such
as
M/S-brand mag-
netic
head cleaner, gives excellent results.)
Rub
the
cleaning
tip
across the
head
tip
from
side to
side.
Avoid
vertical
motion,
which
might
damage
the video
head.
Clean the
erase
and
audio/ control
heads with
SONY
cleaning
fluid,
if
necessary.
Move
the cleaning
tip vertically
across that part
of
the
head surface that
normally
contacts the tape.
Noisy
slip
rings
cause intermittent dark horizontal
lines
in the
playback
picture.
To
clean the
slip
rings,
remove
the
upper
drum
cover
on
the
top
of the
rotary-head
drum
assembly.
Remove
the tape
from
the tape
path.
Apply
a
few drops of
SONY
cleaning
fluid
to the
slip
rings.
Turn on
the
motor
for
10 to
20
seconds. Carefully
wipe excess
fluid
from
the
tape
path
around
the rotary
head
drum
assembly.
If slip-ring
noise
persists,
clean the
slip
rings
direct-
ly
with a head-cleaning
tip
saturated
with
SDNY
cleaning fluid.
Rotate
the
head assembly
by hand
to
avoid contacting the brushes.
4-3.
LUBRICATION
Five
major
lubrication points are:
1.
Supply-Reel Table
Bearing.
2.
Take-Up
Reel Table
Bearing.
3.
Capstan Bearing.
4.
Take-Up Reel
Idler Bearing.
5.
Pinch Roller Bearing.
To
lubricate
the
reel table
bearings,
remove
the
screw
and washer
at
the top
of
the spindle. Lift
the
reel table slightly
so that the
hollow
shaft
of thetable
rises
above the spindle.
Apply one
or
two drops
of
SONY
oil,
OL-1K,
to the inner surface
of
th« reel
table shaft.
Seat the reel table in
its
proper posrtion
and
replace the
screw and washers.
To
lubricate
the Capstan Bearing, pull up the
Capstan
by
hand,
and
apply
a
few drops of
oil
to»
the
Oil Ring of the
Capstan
Bearing.
See Fig. 4-2
,
Be
careful
not
to get
oil
on the surface
of the
Pinch
Roller.
Wipe
off
excess
oil.
Note:
Capstan
Bearing lubrication
is
important.
Oil
as
directed every
200 operating hours.
4- 1