Sanyo M9930K Service Manual

ADJUSTMENT
OF
PINCH
ROLLER
1. Set the unit to the PLAY mode.
2.
Apply
a
tension
gauge
to
the
pinch
roller.
Read
the
gauge
at
the
precise
moment
when
the
pinch
roller
separates
from
‘the
capstan.
3.
if
the
gauge.
reading
is
within
a
range
of
450—650g,
no
adjustment
is
necessary.
!f
otherwise,
make
adjustment
by
changing
the
force
of
the
spring
coil.
(See
exploded
view
No.15)
Fig.1
ADJUSTMENT
OF
HEAD
AZIMUTH
1.
Connect
the
unit
to
a
power
source
and
insert
a
test
cassette
tape
(7K
Hz
pre-recorded)
in
the
cassette
compartment.
2.
Connect
an
4
ohm
dummy
load
with
the
VTVM
across
it
to
the
EXT.
SP
jack
on
the
unit.
3. Set the unit into the PLAY mode
4. Turn the head azimuth adjusting screw until the maximum value
with reading on the VTVM.
5. Fasten the adjusting screw securely by applying paint or glue.
| | CLOCKWISE
COUNTERCLOCKWISE
ail
Oh
=
7
RECORD/PLAY
Head (6) S
iS
Auto
stop
lever
(11)
»~
Sy
BUGIS
oS
Ai
YZ
S| <e
Coil spring (5)
AUTO-STOP ADJUSTMENT
Measure the senser pressure with a tension gauge with the unit set in
the playback mode. The unit should be shut off when the senser
pressure stand within a range of 30 to 55 grams. (Fig. 3)
If the shut-off mechanism fails to function at a senser pressure of 30 to
55 grams, adjust the spring coil (Mechanism No. 60).
Pinch roller lever(15)
Draw the slowly
in a horizontal plane
Fig.3
MECHANICAL ADJUSTMENT
To measure the torque of the tape recorder, a torque gauge
(Fig. 4) and a tension gauge are necessary. To use a tension
gauge, make a hole in the side of the Cassette as shown in
Fig. 5.
Be careful that the tape does not rub against the edge of the
Cassette; these will make correct measurement impossible.
1. Take-up torque (measure with torque gauge)
Play 30~65 gr/cm
Fast forward 60~110 gr/cm
Rewind 60~110 gr/cm
2. Back tension (measure with tension gauge)
Play Less than 5 gr/cm
Fast forward Less than 5 gr/cm
Rewind Less than 5 gr/cm
a
‘io
SAE
; :
i '
Tension
gauge
Cassette
tape
Tension
gauge
Fig.5

Sanyo M9930K Specifications

General

Brand	Sanyo
Model	M9930K
Category	Cassette Player
Language	English