Akai AP-002

CONDITION
EXPLANATION
SOURCE AND SYMPTOM
1. Mechanical noise
(direct noise)
Unusual noise
Contact
of
GUIDE
BELT
(21)
and
BELT
(22)
Relative
height
of
MOTOR-PULLEY
and
GUIDE
BELT
(21)
poor.
(Remove
turn
table
and
check)
Vibration
interference
from
Motor
(MOTOR-
AC-4 (24) ) rotation.
During
motor
rotation,
if
player
panel
or
pick-up
arm
is
touched
with
your
hand,
vibration
is
evident.
Direct rotating noise is audible.
Abnormal
automatic
mechanism
noise
Check
for
irregular
shape
of
CLUTCH-ASSY
(4)
and
TRIP
(5)
STOPPER
GEAR
(7)
needs
greasing.
Variation
in
MOTOR
PULLEY
(23)
During
revolutions,
check
MOTOR
PULLEY
vibration,
form
variation,
and
eccentricity.
COUNTERMEASURE
Adjust
MOTOR
PULLEY
height.
Adjust
motor
installation.
Replace
motor.
Correct
replace.
Grease.
Replace
Motor
pulley.
2. Electrical noise
(from speaker)
Lead
wire
leak
or
pin
plug
cord
connection
faulty.
Sometimes
shock
noise
and
hum
is
emitted.
Interference
when
lead
wire
is
touched.
No
noise
periodically.
Check
with
Tester.
Defective
cartridge
Interference
when
upper
part
of
shell
is
lightly
tapped.
Rumbling
noise
from
motor
(MOTOR
AC-4
(24))
rotation
vibration.
During
motor
revolutions,
vibration
occurs
when
player
mount
table
and
arm
is
touched
with
your
hand,
(Confirm
that
shipping
Correct
lead
wire
wiring.
Make
proper
pin
plug
cord
connection.
Replace cartridge.
Adjust
motor
installation.
Replace
CUSHION-RB-MD
screws have been removed).
1. Electrical circuit
problem
Turntable does
not rotate (or
rotation is
unstable.
Loose or broken lead wire
Faulty soldering
Faulty switch (SW-MINI (12) )
Fuse blown
Check
with
tester
according
to
shematic
L_ diagram.
| 2. MOTOR out of
order (MOTOR AC-4)
Coil open or shorted wire
Check
coil
lead
through
with
Tester.
Rotor
shaft
needs
oil
or
shaft
is
being
caught
by
something.
Rotate rotor by hand and check.
Correct wiring.
Replace switch.
Replace fuse.
Replace motor.
Clean
around
rotatirg
shaft
and
oil.
a 3. Table shaft out of
order
Table shaft and bearing defective
When
turntable
in
rotated
by
hand
it
seems
heavy.
There
is
a
noise
as
soon
as
the
turntable
is
stopped.
Too
much
rattle.
(Re-
move belt & check)
Needs oil
Irregular
noise
when
turntable
is
rotated
by hand.
4. Speed change
mechanism defective
5. Revolutions too slow
or uneven,
BELT (21) poor.
Belt rubbing noise.
Belt
does
not
come
to
specified
position
(drum like part) of MOTOR PULLEY.
Speed change is not smooth.
(After
confirming
distortion
in
Item
4)
Inferior
BELT (22)
Is contact side of belt inferior?
Discolored or misshapen?
Check for belt stretch.
Replace
table
shaft,
bearing
Grease replace.
Relative
position
of
BELT
(22)
and
GUIDE
Adjust
MOTOR
PUL
LEY
height.
Adjust
ADJUSTMEIT
.Nut.
Replace belt.
25