Akai M8

Wo
ADJUSTMENT
OF
TAPE
TRANSPORT
UNIT
1.
ADJUSTMENT
OF
PINCH
WHEEL
It
is
important
that
the
pinch
wheel
shaft
be
kept
in
complete
alignment
with
the
capstan
shaft.
A
proper
pinch
wheel
pressure
is
between
1,000
and
1,150
grams
when
the
unit
is
operated
at
the
tape
speed
of
7-1/2
ips.
Any
deviation
from
this
specification
will
result
in
wow
and
flutter.
Check
pinch
wheel
pressure
using
a
spring
scale
and,
if
necessary,
adjust
the
pinch
wheel
load
spring
to
suit.
2,
ADJUSTMENT
OF
TAKE-UP
IDLER
WEEERL
The
take-up
idler
wheel
must
be
kept
in
complete
alignment
with
the
take-up
reel
shaft.
When
the
unit
is
set
in
fast
forward
condition,
the
idler
wheel
will
contact
to
the
upper
knurled
wheel
of
the
take-up
reel
shaft
assembly,
and
it
will
contact
to
the
lower
knurled
wheel
during
record
or
play
mode.
Adjust
idler
wheel
load
spring
so
that
the
idler
wheel
pressure
is
kept
between
50
and
80
grams.
The
idler
wheel
wears
rapidly
if
the
pressure
is
excessive,
and
slinpage
occurs
in
case
the
pressure
is
smaller
than
the
specification.
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Recording Tape 25meau
0.125mm
0.025mm
VOTE
VF
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ae
+
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Fig. 12
me
3. ADJUSTMENT OF REWIND IDLER WHEEL
The rewind idler wheel must be kept in complete align-
ment with the rewind reel shaft. The amount of pressure
to the knurled motor bushing should be maintained
about
50
grams
during
rewind
operation.
Adjust
both
the idler load spring and rewind roller.
4.
ADJUSTMENT
OF
INTERMEDIATE
WHEEL
The
intermediate
wheel
is
located
between
the
rewind
idler
wheel
and
the
rubber
ring
which
is
used
on
the
upper
part
of
the
supply
reel
shaft
assembly.
Wher
the
unit
is
set
in
rewind
mode,
it
will
contact
to
these
parts
simultaneously
delivering
torque
of
motor.
An
adequate
pressure
to
be
kept
is
50
grams.
Adjust
the
load
spring
of
the
intermediate
wheel
in
case
the
pressure
is
not
sufficient.
5.
ADJUSTMENT
OF
TAKE-UP
REEL
SHAFT
ASSEMBLY
A
felt
clutch
material
is
attached
to
the
bottom
side
of
the
reel
table
base
plate
so
that
recording
tape
will
not
be
siretched
during
fast
forwarding
operation
due
to
excessive
tension.
To
check
the
amount
of
friction
of
this
part,
place
onto
the
take-up
reel
table
a
5-inch
reel
with
recording
tape
wound
by
60
m/m
in
diameter,
and
gently
pull
the
end
of
tape
upward
using
a
spring
scale.
Adjust
the
conical
spring
so
that
the
amount
of
tension
at
this
part
will
be
kept
between
400
to
500
grams.
Another
felt
clutch
material
is
attached
to
the
take-up
drive
wheel.
Itis
used
to
provide
proper
slipping
opera-
tion
during
record
or
play
mode.
The
procedure
for
checking
friction
of
this
part
is
same
as
the
foregoing,
and
between
120
and
200
grams
of
friction
will
provide
the
bert
result.
Adjust
the
star-shaped
spring
immediate
below
the
take-up
drive
wheel.
When
the
unit
is
set
in
rewind
mode,
the
amount
of
friction
of
this
part
will
great:y
be
reduced
and
will
become
10
to
20
grams.
Check
to
see
if
this
is
satisfactory
and,
if
not,
readjust
the
star-shaped
spring
for
Brake,
and
spring
retairar
washes
accordingly.
(See
figure
11
(a)
at
left)
6.
ADJUSTMENT
OF
SUPPLY
REEL
SHAT
ASSEMBLY
A
felt
clutch
material
is
used
between
the
lower
side
‘of
the
reel
table
base
plate
and
the
rewind
rubber
ring
to
protect
recurding
tape
from
an
excessive
tension
while
rewinding
operation.
To
check
the
amount
of
friction.
of
this
part,
place
onto
the
supply
reel
table
a
5-inch
reel
with
recording
tape
wound
by
60m/m
in
diameter
and
gently
pull
the
end
of
tape
upward
using
a
spring
scale.
Adjust
the
conical
spring
so
that
the
amount
of
tension
be
kept
between
400
an
500
grams.
Another
felt
clutch
is
attached
to
the
rewind
drive
wheel
and
is
used
to
provide
proper
slipping
operation
during
record
or
play.
mode.
The
procedure
for
checking
friction
of
this
part
is
same
as
the
foregoing,
and
between
80
and
120
grams
of
friction
will
give
the
best
result.
‘When
the
unit
is
set
in
fast
forward
mode,
the
amount
of
friction
will
greatly
be
reduced
and
will
become
10
to
20
grams.
Check
to
see
if
this
is
proper
and,
if
not,
readjust
coil
spring
and
spring
retainer
washer
to
suit.
7,
ADJUSTMENT
OF
TAPE
HEAD
(See
figure
12
{b)
at
left)
A
vertical
azimuth
alignment
of
tape
head
is
the
only
adjustment
that
can
be
made
at
the
field
of
service.
To
align
tape
head,
play
8,000
cycles
recorced
on
an
Ampex
standard
alignment
tape.
Fotate
the
azimuth
alignment
screw
until
a
maximum
piayback
leve:
through
the
small
hole
which
is
positioned
on
the
shield
cover
of
the
tape
head
assembly.