Akai AP-005 User manual

SERVICE MANUAL
PARTS LIST

AUTOMATIC-TURNTABLE
move. AP-005
SECTION
1
SERVICE
MANUAL............--
22
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1
SECTION
2
PARTS
LIST
........
22.20.02
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21

SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
2 ARS
TECHNICAL DATA .. 2.1... oc ee eens
DISMANTLING OF UNIT... 0.0.6. ee ce ee
ARRANGEMENT OF PRINCIPAL PARTS. ...............
AUTOMATIC MECHANISM ADJUSTMENT...............
1. LEAD-IN POSITION ADJUSTMENT..................
2. LEAD-OUT POSITION ADJUSTMENT ................
<< PLAYER CARE ..
CYCLE CHANGE (MOTOR PULLEY REPLACEMENT) ......
CY
VETRE OR STYLUS: oo ss coe 8 Ss bSetierte oy Bie ses tng ha rc eee
26: EY LUS CHANGE tists cise side eee yace & eee eee oie eed ala te
3. LUBRICATION
VII. BLOCK DIAGRAM
i

1. TECHNICAL DATA
1. TURNTABLE SECTION
TURNTABLE
300
mm
aluminium
alloy
die-cast
turntable
DRIVE SYSTEM Belt drive
MOTORS
(2)
One
4-pole
hysteresis
synchronous
motor
for
turntable
drive
and
a
geared
motor
for
tone arm
drive
SPEED 33-1/3 and 45 rpm
WOW & FLUTTER
SIGNAL TO NOISE RATIO
WEIGHT
0.05% WRMS
Better than 52 dB
1.1 k grams
2. TONE ARM SECTION
TONE
ARM
Static
balanced
type
stainless
steel
tubular
arm
with
inside
force
canceler
and
lateral
balance
weight
ARM
LENGTH
220
mm
STYLUS PRESSURE ADJUSTMENT RANGE
APPLICABLE CARTRIDGE WEIGHT
ARM LIFTER
OVERHANG
SHELL WEIGHT
0 to 3 grams
4 to 8 grams (8 to 12.5 grams using sub-weight)
Oil damped
15 mm
13.5 grams
3. CARTRIDGE SECTION
CARTRIDGE
VM
(dual
magnet
type)
Audio
Technica
model
AT-11
with
0.7
mil
spherical
diamond
stylus.
é
FREQUENCY RESPONSE 15 to 25,000 Hz
OUTPUT VOLTAGE 4 mV (1,000 Hz 50 mm/sec)
CHANNEL SEPARATION 20 dB (1,000 Hz)
OPTIMUM STYLUS PRESSURE 2 grams
REQUIRED LOAD IMPEDANCE 47 to 100 k ohms
WEIGHT 5.5 grams
4. GENERAL SPECIFICATIONS
POWER REQUIREMENTS
CSA Models ..........:c0cees0e- 120V, 60 Hz
CEE Models ..........:.c00000064 220V, 50 Hz
Other Models .............-..008 110 to 120V/220 to 240V, 50/60 Hz (Switchable)
DIMENSIONS 440(W) x 128(H) x 358(D) mm
(17.4" x 50” x 14.1")
WEIGHT 7.6 kg (16.7 Ibs.)
NOTE: For improvement purposes, specifications and design are subject to change without notice.

ll. DISMANTLING OF UNIT
In case of trouble, etc. necessitating disassembly, please
disassemble in the order shown in photographs. Reas-
semble in reverse order.
ADJUSTMENT
BOTTOM COVER
TABLE SHEET
LOOSEN THESE SCREWS SLIGHTLY
TURN TABLE
ADJUSTMENT

lil!
ARRANGEMENT
OF
PRINCIPAL
PARTS
PROXIMITY SWITCH
CK UP PLATE ASSY
TIMING MOTOR
POWER
TRANSFORMER
VOLT SELECTOR
MICRO SWITCH
MOTOR PULLEY
BELT GUIDE
POWER TRANSFORMER
PHASE CAPACITOR
220V op iov
240V i20v
SUPPLY PC BOARD
HYSTERESIS
SYNCHRONOUS MOTOR
AC-4
MAIN WEIGHT
LATERAL WEIGHT
INSIDE FORCE
CANCELLER
PICK UP STAND
PICK UP ARM
HEAD SHELL

IV. AUTOMATIC MECHNISM ADJUSTMENT
Fig. 1
HOLE IN PANEL
(FOR ADJUSTMENT)
Fig. 2

1. LEAD IN POSITION ADJUSTMENT
Remove the rubber plug which is located on panel
toward the rear part of the pick-up arm. When the
pick-up arm is moved from the position shown in
Fig. 1 toward the position shown in Fig. 2 adjustment
screw (B) becomes accessible through the hole from
which the rubber plug has been removed as the
lead-out position is approched. When adjustment
screw (B) is turned clockwise, lead-in is adjusted
further inward and when turned counter-clockwise,
further outward.
Therefore, adjust lead-in position as follows:
For adjusting toward inner circumference turn
clockwise.
For adjusting toward outer circumference turn
counter-clockwise.
NOTE: 1. When the adjustment screw is turned one
revolution, the position of the pick-up
arm stylus is changed by about 2 mm.
2. When using the standard accessory car-
tridge, adjust so that on a 30 cm record,
lead-in takes place between 298 and
293, on a 25cm record, lead-in takes
place between 247 and 242¢, and on a
17 cm record, lead-in takes place between
173 and 168¢.
(These diameters are measured with
Center Spindle as center position.)
3. After adjustment, be sure to re-install
rubber plug.
2. LEAD OUT POSITION
Remove the rubber plug which is located on panel
toward the rear part of the pick-up arm. Stationary
the pick-up arm (on arm rest) as shown in Fig. 1.
At this position, adjustment screw (A) becomes
accessible through the hole from which the rubber
has been removed. When adjustment screw (A) is
turned clockwise, lead-out will be sooner and when
turned counter-clockwise, lead-out will be delayed.
Therefore, adjust lead-in position as follows:
For adjusting toward outer circumference turn
clockwise.
For adjusting toward inner circumference turn
counter-clockwise.
NOTE: 1. When the adjustment screw is turned one
revolution, the position of the pick-up
arm stylus is changed by about 2 mm.
2. When using the standard accessory car-
tridge, adjust so that on a 30 cm or 25 cm
record, operation begins between 115¢
and 109¢@, and on a 17 cm record, opera-
tion begins between 106¢ and 98@.
(These diameters are measured with
Center Spindle and Center Position.)
3. After adjustment, be sure to re-install
rubber plug.

V. CYCLE CHANGE (MOTOR PULLEY REPLACEMENT)
MOTOR PULLEY BELT GUIDE
ALIGN
SET SPEED SELECTOR
i
©
33
RPM
POSITION
GROOVE
Fig. 3
50 Hz and 60 Hz cycle change is effected by changing
the motor pulley.
50 Hz and 60 Hz differentiation can be determined by
the groove on the 60 Hz pulley.
While viewing horizontally as shown in Fig. 3, install so
that the lower part of the motor pulley brim and the
lower part of the belt guide are lined up.
Set speed selector to 33 rpm position, install the belt
and switch on power. If a rumbling noise from the belt
can be heard and speed changing is not smooth, adjust
installation position of motor pulley.

Vi. PLAYER CARE
ATS-Il
1 LIFE OF STYLUS
The lifetime of stylus is about 500 hrs. of use (about
1000 30cm LP records.) If the stylus becomes old,
because the record will be damaged and tone quality
will become inferior, be sure to replace as soon as is
needed. If records on which dust is allowed to
accumulate are played, the stylus will wear especially
fast and the record surface will be scratched. There-
fore, please be sure to keep record clean by wiping
and cleaning the record grooves with water soaked
gauze. Also if dust adheres to the turntable sheet
(rubber mat), as this will cause the record to become
dirty easily, the mat should also be kept clean.
-. STYLUS CHANGE
When replacing stylus, be sure that the stylus
(ATS-11) is inserted properly in the direction of the
arrow mark shown in Fig. 4 and fits into cartridge
firmly. Use only model ATS-11 stylus which is for
use in model AT-11 cartridge.
Fig. 5
3. LUBRICATION
Because for rotating parts and parts which rub
together during operation, oilless metal and the best
grease or oil is used, your machine will not need
lubrication for some time. About once per year, use
standard accessory player oil and apply one or two
drops to the motor shaft as shown in Fig. 5. In case
you do not have player oil, use #60 spindle oil or a
high grade machine oil. If used continually for
business purposes, etc., oil about once or twice per
month.
CAUTION: Following lubrication, because oil will
adhere to the drive belt and pulley and
to the turntable etc., wipe the oil off of
these parts with a cloth to which a little
carbon tetrachloride or thinner (benzine
can be also be used) has been applied.

vil. BLOCK DIAGRAM
1. CARTRIDGE
CPX~ TERMINAL

2. CEE MODELS
POWER a
TRANSFORMER r
ED BLU
Ac
220V 50Hz
BLU "" BLU |
SUPPLY PC BOARD
NO. 22142978
MAIN MOTOR HYSTERESIS
SYNC-HRONOUS MOTOR
TYPE AC-4
3. BSI MODELS
sw2
Bee ee at ee eee eS pee ee SN ae ey as
POWER a
TRANSFORMER [-
RED BLU’
AC
240V 50Hz
SUPPLY P.C BOARD
NO. 22142978
MAIN MOTOR HYSTERESIS
SYNC-HRONOUS MOTOR
TYPE AC-4
10

BLU piu
POWER TRANSFORMER
MAIN MOTOR
BLK
POWER TRANSFORMER
MAIN MOTOR
CAPACITOR
POWER
TRANSFORMER
|
—
TIMING
MOTOR
BLU
LEAF SWITCH
BLU _ MICRO SWITCH
AC CORD = | PROXIMITY SWITCH
LEAF SWITCH
MICRO SWITCH
LEAF SWITCH
MICRO SWITCH

4. SWITCHABLE MODELS
TIMING
AC MOTOR
HOV to 240V
50/60Hz
SUPPLY PC BOARD
NO. 22142098
MAIN MOTOR HYSTERESIS
SYNC-HRONOUS MOTOR
TYPE AC-4
5. CSA MODELS
POWER
“| TRANSFORMER
ac oRee BLU
120V 60Hz
SUPPLY PC BOARD
NO. 22142977
MAIN MOTOR HYSTERESIS
SYNC~HRONOUS MOTOR
TAPE AC~4
12

OFS LEAF SWITCH cis
LEAF SWITCH
MICRO SWITCH
LEAF SWITCH
MICRO SWITCH
LEAF SWITCH
MICRO SWITCH
PROXIMITY SWITCH bck
“|ac CORD
TIMING MOTOR
LEAF SWITCH
MICRO SWITCH
BLK oe
Si
TIMING MOTOR
POWER
TRANSFORMER
O
=
i]
>
CAPACITOR
RED | maw MOTOR
POWER TRANSFORMER == SLU POWER TRANSFORMER
MAIN MOTOR MAIN MOTOR
CAPACITOR
POWER TRANSFORMER [ = TIMING
LEAF SWITCH
MICRO SWITCH
AC
CORD
=
|
PROXIMITY
SWITCH
LEAF SWITCH
MICRO SWITCH
MICRO SWITCH LEAF SWITCH
13

Vill. TROUBLE SHOOTING CHART
Condition Explanation Confirmation Source
Countermeasure
Poor tone 1. Distortion 1. Distortion persists after changing Faulty cartridge.
quality. (When using new stylus and confirming normal
record) pick-up arm operation.
(Amp. Speaker normal)
Replace cartridge.
. Crackling sound even when play-
ing new record. Especially vague
at high range.
Worn stylus.
Replace stylus.
. A crunching sound exists and
there is a sudden change in sound
level. Also the level of right and
left differs greatly.
Bent stylus.
Replace stylus.
. Sound is vague or distortion
exists.
Dust adhering to stylus.
Clean stylus.
. Stylus jumps.
body during record playback.
2. Hum noise
. When pick up arm or player body Faulty grounding
is touched with your hand, hum
noise increases.
and amp.
. A hum is emitted from one
channel (or both channels). tion.
Insufficient pressure.
. Stylus sinks too far into cartridge Too much pressure.
Readjust stylus pressure.
between cartridge and
amp. in-put or turntable
Faulty pin plug connec-
Replace or repair ground
wire.
Connect correctly.
close together.
3. Left/right Using a monaural record, left/right
poor. from the center.
(Perfect Amp/Speaker connections)
cartridge.
4. Distortion at
one channel only.
1. Observe pick-up arm head during
record performance.
f 3. Hum is altered by changing posi- Lead wire from pick-up
tion of lead wire from pick-up. and source wiring is too
The plus and minus
sound separation | sound scatters and is not emitted terminals are reversed on
one side at cartridge
output pin and shell pin
connection or faulty
Bent pick-up head.
Move lead wire to obtain
minimum hum.
Connect plus and minus
correctly.
Replace cartridge.
Replace pick-up arm.
2. After pick-up arm side pressure
and zero balance adjustment, shaft faulty.
pick-up arm does not move
smoothly by means of inside force
canceller.
Pick-up arm rotating
Replace pick-up arm
assembly.
hand.
3. Pick-up arm heavy or catches Installation of pick-up
when moved to left and right by plate assembly faulty.
Correct pick-up
plate installation
height as specified.
Replace pin plug cord.
Replace muting switch.
Adjust installation
position.
Replace cartridge.
5. No sound. 1. Check pin plug cord lead-through Disconnected or broken
with tester. wire.
2. Check muting switch lead-through | Shorted.
with tester and installation Installation position
position. faulty.
3. Check cartridge terminal DC Broken wire inside
resistance with tester. (L ch, R ch) | cartridge or shorted.
Unusual noise 1. Mechanical 1. Metal is rubbing against in rotating | Insufficient oil or grease.
noise. part of automatic mechanism. Catches on something
(direct noise) irregular.
2. Belt contacting belt guide.
height.
Faulty motor pulley
Clean and lubricate
rotating part.
Adjust height of motor
pulley.
3. During revolution vibration exists
or noise is audible.
Faulty main motor.
Replace main motor.
4. During motor rotation, if arm or
table mount is touched with your
hand, vibration is evident.
motor cushions.
Faulty installation of
motor or variation in
Adjust motor installation
position. :
Replace motor cushions.
5. Observe motor pulley during
revolutions.
pulley.
Variation in motor
Replace motor pulley.
14

Condition
Explanation
Confirmation
Source
Countermeasure
2.
Electrical
1.
Sometimes
shock
noise
and
hum
Faulty
pin
plug
cord
Re-connect.
noise.
is
emitted.
connection.
Replace
or
repair
lead
(from
speaker)
Lead
wire
leak
or
wire.
2. When lead wire is moved, sound
is cut or noise is audible.
3. Interference when upper part of
shell is lightly tapped.
immediately prior to and immedi-
ately following record
performance.
4. A rough scratching noise is emitted
<1
lead wire broken.
Defective cartridge.
Faulty cartridge
terminal connection.
Replace cartridge.
Make proper lead wire
connection.
Faulty muting switch
contact.
Al
Replace muting switch.
Clean contact point.
5. Vibration and noise from motor,
during revolutions.
Replace main motor.
Turntable does
not rotate.
(or rotation is
unstable)
1. Electrical
circuit problem. .
2. Table shaft
out of order.
1. Check Supply P.C Board fuse
with tester.
Faulty main motor.
Fuse blown.
Replace with proper fuse.
(1A)
2. Check leaf-switch lead-through
with tester.
|
Faulty contact points.
Replace leaf-switch.
3. Check various parts of Supply
P.C Board with tester.
Faulty parts.
4. Check main lead wires with tester.
5. Check motor coils with tester.
1. When rotor is rotated by hand, it
catches or rotation is not light
and smooth.
2. When turntable in rotated by
hand it seems heavy. Unusual
noise and too much rattle
(with belt removed).
2. Belt rubbing noise.
4. Revolutions Check for variation in shape of belt
too slow.
(or uneven)
and whether dust is adhering to belt,
— Replace faulty parts
Disconnected or broken
lead wire.
Replace or repair lead
wire.
Broken coil.
Insufficient oil
(rotor shaft).
Table shaft, bearing
defective or insufficient
oil (table shaft and
bearing)
Faulty motor pulley
height.
Variation of belt.
Dust.
Automatic
mechanism does
not function.
1. Does not lead-
in. (Check arm
test clamp to see
whether it has
come off.)
motor pulley and turntable.
1. Check Supply P.C Board fuse with
| Fuse blown.
Replace motor.
Clean and lubricate
Replace table shaft and
bearing. Lubricate table
shaft and bearing.
3.
Speed
change
|
1.
Slippage
between
belt,
motor
Oil
adhering
to
belt.
Replace
belt.
mechanism
pulley
and
turntable.
Worn
out
belt
Clean
with
carbon
tetrachloride or alcohol.
Adjust motor pulley
height and motor slant.
Replace belt.
Clean with carbon
tetrachloride or alcohol.
Replace fuse (1A)
tester.
| 2. Check leaf-switch lead-through
with tester.
ke
Replace leaf-switch.
3. Vibration occurs when low speed
motor is touched with your hand,
but does not rotate.
4. Check low speed motor lead-
through with tester.
Faulty motor.
Broken wire or short.
Faulty contact points.
[Replace low speed motor.
(Timing motor)
5. Low speed motor rotates, but
Action-Cam does not move at all.
Action-Cam installation
screws loose.
Tighten installation
screws.
6. Low speed motor and Action-Cam
vibrate.
7. Turn-Plate rotation is not smooth
and rotation is not exactly 90°
each time.
8. The lifter is very high and pick-
up arm does not ride on the arm
Test.
Variation in shape or
Crank-Lever.
Replace or repair
Crank-Lever.
off or lost it’s strength.
Tortion-Spring has come
Re-install or replace
Torsion-Spring.
Faulty lifter height.
9. Manual lifter knob can be brought
DOWN, but stylus does not lower.
Pick-up arm displays horizontal
motion only.
Faulty manual lifter.
Adjust lifter height.
Replace hand lifter
assernbly.
15

16
Condition
Explanation
Confirmation
Source
Countermeasure
10.
Stiff
motion
when
arm is
lowered
| Insufficient
oil
(lifter
Clean
and
oil
lifter
shaft.
or
catches while being
lowered.
shaft).
Dust.
2.
Does
not
1.
When
arm
is
brought
gently
to
Faulty
installation
of
Re-install
pick-up
plate
lead-out.
record
level
by
hand,
normal
pick-up
plate
assembly.
assembly.
lead-out operation begins.
When pick-up arm is brought
inward, PROXIMITY-SWITCH
and magnet are not horizontally
aligned and the gap is not 1 to
2 mm.
. When knob is brought to CUT
position, lead-out operation
begins normally.
Installation part of
magnet bent. Switch
position faulty.
Repair pick-up arm plate
assembly. Adjust
PROXIMITY-SWITCH
installation position.
PROXIMITY-SWITCH
SWITCH.
defective.
3. Does not stop
from continuous
play.
ie
. Check leaf-switch lead-through
with tester.
Faulty leaf-switch
contact point.
Replace PROXIMITY-
Replace leaf-switch.
Check with tester according to
schematic diagram.
Lead wire shorted. lee wiring.
. When the Cut Knob is slanted a
little foward the PLAY/CUT
side, continuous play is stopped.
4. Automatic
operation is not
smooth or stops
during operation.
5. Incorrect
lead-in position.
e
. With selector knob set to 30 and
. Check to see whether pick-up plate
. Check loose play of pick-up arm
Stiff motion when arm is lowering
or catches while lowering.
. When the low speed motor is
touched with your hand, it stops
immediately.
. Check to see whether pick-up arm
lock-nut is loose.
Check to see if cartridge is in
center of shell.
assembly is loose when moved by
hand.
bearing part.
Variation in shape of or
faulty installation of
plate spring. Insufficient
grease.
Replace or properly
install plate spring
Grease.
Insufficient oil
(Action-Plate
Assembly).
Insufficient torque.
Faulty installation
position.
Faulty installation
position.
Grease.
Overhaul lifter and grease.
Replace low speed motor.
Tighten holding lock-nut.
Properly install.
Tighten installation
holding screw.
mest
Defective pick-up arm.
Replace pick-up ‘arm.
using a 30 cm record, the lead-in
position is off by about 2 to 3 mm.
6. Incorrect
lead-out position.
. Pick-up arm lock-nut with which
the cartridge is installed is loose.
Check to see if cartridge is in
center of shell.
. When pick-up arm is brought
inward, PROXIMITY-SWITCH
and magnet are not horizontally
aligned, and the gap is not 2 to
2.5 mm.
Faulty adjustment.
Improper cartridge
installation.
Installation on part of
magnet bent. Faulty
switch installation
position.
. When selector knob is switched to
and from 17 and 25, PROXIMITY-
SWITCH does not move or
movement is poor.
Switch lever B is bent.
Tighten adjustment screw
at optimum adjusted
position.
Correct installation.
Repair pick-up arm plate
assembly.
Adjust PROXIMITY-
SWITCH installation
position.
Repair or replace switch
lever B.
Too much loose play or pick-up
arm bearing part.
Defective pick-up arm.
Replace pick-up arm.
Pick-up plate assembly installation
screws loose.
Faulty installation.
Tighten installation
holding screws.
. With selector knob set to 30 and
using a 30 cm record the lead-out
position is off by about 2 to 3mm.
Faulty adjustment.
Tighten adjustment screw
at optimum adjusted
position.

Condition
Explanation
7. Does not
repeat. (lead-in
operates
normally.)
Confirmation
Source
Countermeasure
. With cut knob set to REPEAT,
check leaf-switch lead-through
with tester.
Faulty contact.
Replace leaf-switch.
. Cut knob cannot be set to
REPEAT.
8. Cannot
manually
manipulate.
Variation in shape of
plate-spring or damaged.
Repair plate-spring
Replace plate-spring.
. When pick-up arm is moved to
the vicinity of the outer
circumference of a 30 cm
record, Plate Manual-B does not
properly drop from pick-up arm
plate assembly.
Faulty installation
position of pick-up plate
assembly.
Adjust installation
position.
. Manual-Plate-B does not operate
smoothly.
Operation of
Manual lifter
faulty.
(at record
performance)
1. Lifter does
not work when
set to DOWN
position.
Variation in shape of or
faulty installation of
Manual-Plate-A or B.
Repair or replace
Insufficient oil inside cylinder.
Insufficient oil.
Replace lifter assembly.
2. Does not
operation when
lifter is brought
up or down.
Check lifter plate.
Check plate spring.
Variation in shape or
bent.
Variation in shape of or
faulty installation.
Repair or replace
Repair or replace or
properly install
17

18
MEMO