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SECTION
7
MECHANICAL
SYSTEM
MAINTENANCE
7-1.
INTRODUCTION
Machine
compatibility
(interchangeability
of
tapes
between
machines)
depends
upon
very
close
mechanical
tolerances
in the tape path.
The tape
path
is factory-adjusted
and
should
not
require
realignment
under
normal circumstances.
Do not
attempt
adjustment
of
the
tape
guides,
tapered
guides
and
tape
guide-band.
They
should
be
adjusted with use of adjustment jigs.
If mechanical
damage
requires
replacement
and/or adjustment
of
the guides in the tape path, return the machine
to
a SONY
FACTORY
SERVICE
CENTER
for repair.
Visual Check:
Visual
check
on
the
unit helps. to locate
the
trouble.
1.
Capstan does
a. Capstan.
belt
drops
from
not rotate.
pulley.
b. Capstan
belt slips.
Needs
replacement.
2.
Tape is not
a. Sub-belt
drops
from
the
wound
onto
pulley.
take-up reel
b. Sub-belt
slips.
Needs
re-
or supply
reel
placement.
in respective
c. Take-up
belt slips due to
mode.
accumulation
of oil, dust
etc.
Needs cleaning or re-
placement.
See Sec. 7-8
and 7-9,
b. Record
servo
readjust-
ment.
(See Sec. 4)
properly.
Needs
brake
link
readjustment.
(See
Sec. 2-3)
Fig. 7-1
7-2.
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 front.
See Fig. 7-2.
Fig. 7-2
Head cleaning
7-1
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