Sony TC-640 - Maintenance; Lubrication; Demagnetizing

SECTION 4
MAINTENANCE
4-1. LUBRICATION
Use
light
machine
oil
and
lubricate
the
pinch
roller
shaft
and
capstan
drive
motor
lubricating
hole.
It
will
cause
slippage
of
the
mechanism.
If
the
oil
spills
on
the
pinch
roller
or
the
rubber
belt,
wipe
it
off
immediately
with
denatured
alcohol.
To
lubricate
them,
proceed
as
follows:
Avoid excessive lubrication.
(1)
Remove
the
head
cover
and
the
screw
securing
pinch
roller
and
then
lubricate
the
pinch
roller
shaft
with
one
drop
of
light
machine
oil.
(2)
Remove
the
reel
panel
and
lubricate
the
motor
lubricating
hole
with
several
drops
of
light
machine
oil.
Note: Use the oil which is comparatively
viscous at the pinch roller shaft.
4-2. CLEANING
Dusts and dirts which were brought by tape
may stick to the core of the record, playback or
erase head, and they may deteriorate the perform-
ance of the record and the playback heads. So wipe
off the surface of the heads, with a clean and soft
cloth dampened with denatured alcohol. To ensure
proper operation, the heads should be cleaned at
least once during each ten hours of actual operation.
CAUTION
Do not use any other ‘solvent on the head as
some will damage the material which binds
the head laminations together. Also do not
use any metallic device which will scratch the
head.
At the same time, clean capstan, rubber belt,
pinch roller, tape guide, flutter filter roller and
tension arm.
4-3. DEMAGNETIZING
The record and playback heads may occasionally
acquire a degree of permanent magnetization, which
will result in an increase of noise level, distortion of
any recorded signal, and a gradual erasure of high
frequency on any recorded tape which passed over
them. These heads may be easily demagnetized
with a SONY head demagnetizer HE-2 (optional
accessory) or equivalent.
To demagnetize the heads, proceed as follows:
Steps:
(1) Remove the head cover.
(2) Make sure that power switch on the TC-640
is in the OFF position.
(3) Connect the demagnetizer to ac power source.
(4) Bring the tips of the demagnetizer in close
proximity to, but not in contact with, the
heads so that the tips straddle the gap in the
center of the head, run the tips up and down
the heads several times, and then slowly with-
draw the demagnetizer.
CAUTION
Do not bring magnet close to heads.