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SECTION
5
REPLACEMENT
OF
MAJOR
PARTS
o-1.
REPLACEMENT
OF
THE
UPPER
DRUM
ASSEMBLY
. The
Rotary
Video
Heads
cannot
be
replaced
individually.
The
entire
Upper
Drum
Assembly
should be replaced
when
any of these heads
fails.
Tool:
Drum eccentricity gauge (1)
Drum
eccentricity
gauge
(2)
Drum
eccentricity
gauge
(3)
Drum
eccentricity
gauge
(4)
Replacement
procedure:
Upper Drum Assembly
(1)
Disconnect
the
connector
of
the
brush
from
the
Slip
Ring
Block.
Remove
the
Brush
Assembly
from
the
drum _
after
Brush Assembly
removing
the two
fixing screws.
(2)
Unsolder
the
eight
leads
from
the
video
head
at
the
printed
circuit
board.
Remove
the
two
fixing
screws
and
then
remove
the
Upper
Drum
Assembly
from
the
Head
Drum
Assembly.
(3)
Clean
the matching surfaces of the flange
and
new
Upper
Drum
Assembly
with
a
cloth
moistened
with
cleaning
fluid.
(If
there
is
a
spacer
between
the
drum
and
the
flange,
it
should
be
left
on
the
flange.
If
the
spacer
is
lost,
correct
interchangability cannot be obtained.)
(4)
Place
the
Upper
Drum
Assembly
so
that
the
side
with
the
three
red
leads
matches
side
"B"
of
the
printed
circuit
board
as
shown
in
the
figure.
Thread
the
two
fixing
screws
snugly
but
do
not
tighten
them.
white
5-1
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