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Alpine 7619R - Page 55

Alpine 7619R
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e.
Replacement
of
the
pinch
rollers
(1)
Remove
pinch
roller
spring
@)
as
shown
in
Figure
20.
(2)
Remove
M3.1
two
lock
washers
@)
and
remove
the
pinch
roller
as
shown
in
Figure
20.
(3)
Mount
the
pinch
rollers
following
the
removal
steps
in
the
reverse
order.
Apply
insulation
coating
to
the
position
()-2
of
the
pinch
roller
as
shown
in
Figure
20.
Note:
Make
sure
that
the
pinch
rollers
are
thoroughly
fixed
and
that
they
are
not
deformed.
Do
not
reuse
used
lock
washers.
Take
care
to
avoid
damage
by
piercing
and
tearing.
@
Head
base
Figure
20
Chassis
GR/GR-Y
Series
f.
Replacement
of
the
head
(1)
After
removing
the
pinch
roller
spring,
remove
two
screws
@)
as
shown
in
Figure
21.
(2)
Remove
solder
@0
and
remove
the
head
from
the
head
P.C.
board
as
shown
in
Figure
22.
(3)
After
replacement,
mount
the
new
head
following
the
removal
steps
in
the
reverse
order.
Notes:
1.
Refer
to
Item
2-C
to
make
sure
that
the
temperature
of
the
soldering
iron
and
the
soldering
time
are
proper.
Do
not
bring
the
soldering
iron
near
the
head
P.C.
board.
Make
sure
that
the
head
P.C.
board
is
not
lifted.
2.
Fasten
the
two
screws
with
a
fastening
torque
of
2.3
kg.cm.
Note
that
the
tension
of
the
head
spring
can
be
decreased
if
the
screws
are
fastened
too
strongly.
Head
Spring
head
[For
GR75L02Y,
GR75L52Y,
GR75H030,
GR75H020,
GR75H130
models
only]
Spring
head
Head
base
assembly
Figure
21
eh
GR/GR-Y
Series
(4)
Adjust
the
height
of
the
head
as
shown
in
Figures
23,
24
and
25.
@
Place
the
height
adjustment
gauge
(Al-500)
on
the
head
base,
and
adjust
the
height
so
that
the
check
bar
fits
in
the
tape
head
guide
smoothly.
@_
When
the
check
bar
touches
the
top
(or
bottom)
of
the
tape
guide,
insert
a
spacer
(t
0.1
mm
or
polislider
washer
t
0.13
mm).
If
necessary,
remove
the
spacer.
Note:
If
you
do
not
have
a
height
gauge
like
described
in
(4)-G),
run
the
tape
at
normal
speed
and
adjust
the
height
of
the
head
and
the
tape
head
guide
so
that
the
tape
does
not
curl.
Head
Head
P.C.
board
Figure
22
(5)
After
having
assembled
the
complete
mechanism,
adjust
the
angle
of
the
head
with
test
tape
MTT-113C.
(Refer
to
chapter
“Adjustment
of
the
head
angle”.)
After
the
adjustment,
apply
the
screw
lock
and
fix
the
screws.
Tilting-
i
Angle
(NG)
(NG)
as
|
Head
Al-500
gauge
Figure
23
Playback
head
TES)
ITLL
TTA
CLLLLLLL
ELIT
LALLA
a
Al-500
gauge
Tape
head
Spacer
guide
Figure
24
Adjustment
screw
Minimum
Al-500
gauge
(The
gauge
must
be
Maximum
inserted
smoothly.)
The
nosepiece
of
the
gauge
must
be
between
the
minimum
and
maximum
positions.
Figure
25
—
16
—

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