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7
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MAINTENANCE
To maintain
the deck's
original
performance.
it is necessary
to keep
clean and well lubricated
the
rotating
parts.
Normally, motors,
capstan,
pinch
roller,
and
other rotating
parts
require lubrication
once every
1000 to 2000
hours.
Therefore,
once-a-year lubrication
is
all that is needed. However,
dirt and dust
accumulation,
or
extended
use
of
the deck may
result in a need for more frequent
lubrication,
even if oil
was applied less
than a
year
ago. So,
be sure to check
the rotating
parts
whenever
you
undertake
repairs
on
the
deck. Here's
how
to
clean
and lubricate
each rotating
part
in
the
7700.
7.1
CLEANING
a) Heads:
Clean
the
head
surfaces
by wiping them with
a cotton
or
gauze
swab
stick
moistened
with
cleaning liquid.
b)
Pinch
Roller:
Wipe the
pinch
roller
gently
where
the tape scrapes,
as well as its metal
part,
with alcohol-moistened
lint cloth.
Also wipe clean
any residues
on the
pinch
roller
shaft.
After
cleaning,
check very
carefully
that the rubber is not
diformed or cracked.
c) Capstan:
Extract
the
shaft from
the
metal bearing
and check
it carefully
for
damage. Light scoring damage
can be
smooth-
ened
and cured with
light emery
paper
and
oil. Heavy
damage,
however,
requires replacement
of
the shaft with
flywheel.
After
checking and/or replacement, be
sure to
lubricate.
Next, operate
the
deck
in
PLAYBACK
moode
for
three to
four
hours,
and
then
make sure
the deck works well.
d) Belts &
Pulleys:
Remove and clean
the belts with an alcohol-moistened
piece
of cloth.
Check
for
nicks and
stretches. lf defective,
replace with new
ones.
Dirt accumulates-much
more
than
you
can
imagine-on
the
pulleys
and
flywheel where
belts
are
in constant
contact,
so
clean
pulley
and flywheel carefully.
Dirt deteriorates
the wow
characteristic
of
the
deck.
7-2
LUBRICATION
We
suggest
you
lubricate
parts
only after
running
the deck
for
one hour or two,
for
by then the rotating
parts
will
have warmed up
enough
to
facilitate lubrication.
a)
Motor:
Apply one or two drops of oil
each
to
its motor bearing
and
motor
shaft.
b)
Pinch Roller:
Apply
one
drops
of oil
each
to
its bearing and
shaft.
c)
Capslan:
Appl.y one
drop
of oil to
the
capstan
shaft, and
one ortwo to the
bearing hole.
NOTE:
Should
excessive
oil
flow
from
the bearing or
oil
orifice, be
sure
to wipe it
perfectly
clean. lf left, it will
eventually
spread around,
breaking down
the
mechanism.
With
a deck
that
is
fresh from
the
factory,
one
drop or two of
oil
each to the
bearings
will
suffice;
you
need
not
remove the
pinch
roller.
capstan,
etc.
7.3 DEMAGNETIZING
a)
lt is recommended to demagnetize
the heads always
before testing,
adjusting
or repairing
the
tape deck.
b) The
heads
tend to be magnetized
with
use over
a
period
of time.
lf
a recorded tape
is
played
with a
magnetized head, it
may
pick
up
noise. To
avoid
this, the heads should
periodically
cleaned
(once
every 50
hours of use minimum).
c)
Follow the instructions below
to
use
a head demagnetizer and demagnetize
the
heads.
1. Remove
the
power
cable
from the
AC
outlet,
and
remove the head cover.
2.
Turn the head demagnetizer on,
bring
the tips
of
the
demagnetizer
close to the head
surface
(but
do
not
y actually touch the head surface),
move
them up and down over
the
head surface several
times, and move
the
demagnetizer away from
the head. Turn
the demagnetizer
power
off
when it is
at
least
12 inches away
from the head. Repeat this
process
a few times to
assure
complete demagnetization.
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