Akai M-9 - VI. MECHANISM ADJUSTMENT; ADJUSTMENT OF PINCH WHEEL; ADJUSTMENT OF TAKE-UP IDLER WHEEL; ADJUSTMENT OF REWIND IDLER WHEEL

1. ADJUSTMENT OF PINCH WHEEL
It
is
important
that
the
pinch
wheel
shaft
is
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
by
a
spring
scale,
and
if
necessary,
adjust
the
pinch
wheel
load
spring.
2. ADJUSTMENT OF TAKE-UP IDLER WHEEL
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
with
the
upper
knurled
wheel
of
the
take-up
reel
shaft
assembly,
and
it
will
contact
with
the
lower
knurled
wheel
during
record
or
play
operation.
Adjust
idler
wheel
load
spring
so
that
the
idler
wheel
pressure
is
kept
between
50
and
80
grams.
The
idler
wheel
rapidly
wears
if
the
pressure
is
excessive.
Slippage
occurs
if
the
pressure
is
smaller
than
the
specification.
(a)
Rewind
reel
shaft
assy.
(b)
Take-up
reel
shaft
assy.
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|
reel
shaft
,
reei
table
reel
<table
base
plate
felt
clutch
reel stopper
drive shaft
rewind pulley ‘
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‘ Spring metal washer
felt clutch retainer
washer ———=f-
drive wheel
<ola
star-shaped
spring
Sis
washer
===>
metal
washer
=
retainer
==>
nylon
washer
oilite metal mtg. plate aT oilite metal
star-shaped — cow
spring for brake ;
coil spring
__-washer
retainer
nylon spring
£ washer
j
;
a
set
sleeve
Fig. 1
3. ADJUSTMENT OF REWIND IDLER WHEEL
The rewind idler wheel must be kept in complete alignment
with
the
rewind
reel
shaft.
The
amount
of
pressure
on
the
knurled
motor
bushing
should
be
maintained
at
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.
When
the
unit
is
set
in
rewind
condition
it
will
contact
with
these
parts
simultaneously
transmitting
torque
of
motor.
An
adequate
pressure
is
50
grams.
Adjust
the
load
spring
of
the
intermediate
wheel
if
the
pressure
is
not
sufficient.
5.
ADJUSTMENT
OF
TAKE-UP
REEL
SHAFT
ASSEMBLY
Felt
clutch
material
is
attached
to
the
bottom
side
of
the
reel
table
base
plate
so
that
recording
tape
will
not
be
stretched
during
fast
forward
operation
because
of
excessive
tension.
To
check
the
amount
of
friction
of
this
part,
place
a
5-inch
reel
with
a
tape
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
and
500
grams.
Other
felt
clutch
material
is
attached
to
the
take-up
drive
wheel.
It
is
to
provide
proper
slipping
operation
during
record
or
play
operation.
The
procedure
for
checking
friction
of
this
part
is
the
same
as
the
foregoing,
and
between
150
and
200
grams
of
friction
will
provide
the
best
result.
Adjust
the
star-shaped
spring
just
under
the
take-up
drive
wheel.
When
the
unit
is
set
to
rewind
operation,
the
amount
of
friction
of
this
part
will
be
greatly
reduced
and
will
become
15
to
20
grams.
Check
to
see
whether
this
is
satisfactory,
if
not,
readjust
the
star-shaped
spring
for
Brake,
and
the
pressure
of
the
spring
retainer
will
be
accordingly.
(See
figure
1
(b)
at
left)
6.
ADJUSTMENT
OF
SUPPLY
REEL
SHAFT
ASSEMBLY
Felt
clutch
material
is
used
between
the
lower
side
of
the
reel
table
base
plate
and
the
rewind
rubber
ring
to
protect
recording
tape
from
excessive
tension
during
the
rewinding
operation.
To
check
the
amount
of
friction
of
this
part,
place
onto
the
supply
reel
table
a
5-inch
reel
with
a
tape
60
m/m
in
diameter,
and
gently
pull
the
end
of
tape
upward
by
a
spring
scale.
Adjust
the
conical
spring
so
that
the
amount
of
tension
-
is
kept
between
400
and
500
grams.
Other
felt
clutch
material
is
attached
to
the
rewind
drive
wheel
to
provide
proper
slipping
operation
during
record
or
play
opention.
The
procedure
for
checking
friction
of
this
part
is
the
same
as
the
foregoing,
and
between
80
and
120
grams
of
friction
will
give
the
best
result.
When
the
unit
is
set
to
fast
forward
operation,
the
amount
of
friction
will
be
greatly
reduced
and
will
become
15
~
20
grams.
Check
to
see
whether
this
is
correct.
If
not,
teadjust
coil
spring
and
spring
retainer
washer.
(See
figure
1
(a)at
left)
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