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  9. Pioneer PL-4 User manual

Pioneer PL-4 User manual

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Service
PAL
ETUIET
REPAIR
&
ADJUSTMENTS
ORDER
NO.
ART-709-0
STEREO
TURNTABLE
L.—<}
PL-320
MODEL
PL-4
COMES
IN
SEVEN
VERSIONS
DISTINGUISHED
AS
FOLLOWS:
Remarks
120V
only
U.S.A.
model
(Without
cartridge)
120V
only
Canada
model
(Without
cartridge)
220V
—
240V
Europe
model
220V
—
240V
United
kingdom
model
220V
—
240V
Oceania
model
110V—1
20V/220V—240V
(Switchable)
General
export
model
110V—120V/220V—240V
(Switchable)
U.S.
military
model
MODEL
PL-320
COMES
IN
FIVE
VERSIONS
DISTINGUISHED
AS
FOLLOWS:
Voltage
Remarks
220V
—
240V
Europe
model
220V
—
240V
United
kingdom
mode!
220V
—
240V
Oceania
model
110V—120V/220V—240V
(Switchable)
Generali
export
mode!
110V—1
20V/220V—240V
(Switchable)
U.S.
military
model
(Without
dust
cover)
=
This
is
the
service
manual
for
model
PL-4/KUT.
For
servicing
of
the
other
types,
please
refer
to
the
additional
service
manual.
®=
Ce
manuel
d’instruction
se
refére
au
mode
de
réglage,
en
frangais.
=
Este
manual
de
servicio
trata
del
método
de
ajuste
escrito
en
espajiol.
PIONEER
ELECTRONIC
CORPORATION
4-1.
Meguro
1-Chome,
Meguro-ku,
Tokyo
153,
Japan
U.S.
PIONEER
ELECTRONICS
CORPORATION
&5
Oxford
Drive,
Moonachie,
New
Jersey
07074,
U.S.A.
PIONEER
ELECTRONIC
(EUROPE)
N.V.
Luithagen-Haven
9,
2030
Antwerp,
Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
178-184
Boundary
Road,
Braeside,
Victoria
3195,
Australia
FU
©
APR.
1981
Printed
in
Japan
=
For
the
circuit
and
mechanism
descriptions,
please
refer
to
the
supplement
of
model
PL-7
service
manual
(ART-768).
CONTENTS
1.
SPECIFICATIONS
...........2
000s
eee
2
2.
FRONT
PANEL
FACILITIES..............
3
3.
DISASSEMBLY
...
0...
eee
ee
ee
eee eee
4
4,
TROUBLESHOOTING.
...........00
000
es
6
5.
PRECAUTIONS
FOR
REASSEMBLY........
10
6.
BLOCK
DIAGRAM..........
00ers
12
7.
P.C.
BOARDS
CONNECTION
DIAGRAM.....
13
1.
SPECIFICATIONS
Motor
and
Turntable
Drive
System
1.0...
eee
teen
eae
Direct-drive
IMG
BOF
sister,
ly
ecncte
te
cabin,
bes
gris
Sens
Dhansel
ROEUE,
Cate
Hen
eee
iets
DC
servo
motor
Turntable
Platter.
.........310mm
diam.
aluminum
alloy
die-cast.
SPECS
ye
865
suh
fisidanctivns
elhenttw
oem
Wamesianace6
Alea
33-1/3
and
45rpm
Wow
and
Flutter
.............02
000
Less
than
0.025%
(WRMS)
Signal-to-Noise
Ratio..............--.
More
than
78dB
(DIN-B)
(with
Pioneer
cartridge
model
PC-3MC)
Tonearm
TY
Dh
are
oes
Aucune
ee
ecole
Static-balance
type,
Straight
pipe
arm
Effective
Arm
Length
..........2--2
2200-2
eee
eee
221mm
Overhang:
escaped
acess
dow
ogc
Gee
ert
acs
ale
de
aa
15.5mm
Usable
Cartridge
Weight
........-.-..
3g
(min.)
to
8g
(max.)
Subfunctions
Auto-return
mechanism,
Anti-skating
force
control,
Stylus
pressure
direct-readout
counterweight,
Cueing
device,
Strobe
light,
Free
stop
hinges
Miscellaneous
Power
Requirements.
...........
00
0
ee
es
AC120V,
60Hz
Power
Consumption
...........000
0000
cece
OW
Dimensions
..............
420(W)
X
108(H)
X
367(D)mm
16-1/2(W)
X
4-1/4(H)
X
14-7/16(D)in.
Weight
0
.'65
5.0.
Sg
iy
ee
vslare
A
gh
Bla
teen
plete
5.8kg/12
ib
12
oz
2
8.
SCHEMATIC
DIAGRAM...............-
15
9.
EXPLODED
VIEWS
.............-.00.0.
17
10.
ELECTRICAL
PARTS
LIST..............
22
11.
ADJUSTMENTS.
..........00.-
2002
eee
23
REGLAGE.
cal
tyies
cea
uae
naam
24
AIJUST
Eee
ie
GGA
Reh
Ae
eed
Ea
ee
25
12.:-PAGKING
cc
8d
4s
Saas
ore
whee
ee
26
Accessories
EP
Adapters
5.3.22
foes
Se
lense
ce ek
tee
ee
he
WS
Rte
SEN
ie
1
Operating
Instructions...
2...
...0.0.0.00.000.
000
eee
ee
1
NOTE:
Specifications
and
design
subject
to
possible
modification
without
notice,
due
to
improvements.
:
:
3
7
i
q
a
a
:
thigh
a
i
i
ir
aS
2.
FRONT
PANEL
FACILITIES
eS
®
eo
©
()
CUT
switch
Depress
this
switch
to
stop
play.
(2)
Speed
check
window
Look
through
this
window
and
observe
the
movement
of
the
striped
pattern
when
checking
the
rotational
speed
or
finely
adjusting
the
speed.
The
position
of
the
striped
pattern
differs
according
to
the
power
line
frequency
(50
Hz
or
60
Hz)
in
the
area
of
use
and
the
speed
(33
or
45
rpm)
of
the
platter.
Top
pattern:
For
45
rpm
in
50
Hz
area
Second
pattern:
For
45
rpm
in
60
Hz
area
Third
pattern:
For
33
rpm
in
50
Hz
area
Bottom
pattern:
For
33
rpm
in
60
Hz
area
(3)SPEED
ADJ
control
Rotate
this
control
in
order
to
finely
adjust
the
speed
of
the
platter.
The
speed
is
reduced
when
the
control
is
rotated
in
the
[-
]
direction.
The
speed
is
increased
when
the
control
is
rotated
in
the
[+]
direction.
(4)
SPEED
switch
Set
this
switch
in
accordance
with
the
speed
of
the
re-
cord
which
is
to
be
played.
[33]
(depressed
position):
[45]
(released
position):
©)
Cartridge
For
33-1/3
rpm
records
For
45
rpm
records
(6)
Headshell
@
Tonearm
(8)
ARM
ELEVATION
lever
Operate
this
lever
when
starting
record
play
or
when
temporarily
suspending
play.
@
ANTI-SKATE
control
This
is
rotated
when
performing
the
anti-skating
adjust-
ment.
Arm
rest
This
serves
to
hold
and
clamp
the
tonearm.
When
moving
the
tonearm,
release
the
clamp.
(})
Tracking
force
adjustment
weight
This
is
used
when
adjusting
the
tracking
force.
(2
Platter
(3)
Platter
mounting
shaft
Rubber
mat
(5)
EP
adapter
This
is
used
when
playing
records
without
a
‘‘middle.”’
(16
Cabinet
(7)
Dust
cover
3.
DISASSEMBLY
3.1
PANEL
AND
BASE
In
removing
the
panel,
follow
the
below
listed
steps
in
the
order
given.
Using
any
unnecessary
force
will
result
in
bending
the
springs
or
damaging
other
parts.
Panel
removal
steps
1.
Remove
the
headshell
and
weight
assembly,
and
the
weight
shaft
assembly.
The
weight
shaft
assembly
is
removed
by
loosening
screw
(Hexagone
socket
screw)
and
the
headshell
by
loosening
screw
@
.
2.
Lift
off
the
turntable
platter.
Turntable
platter
3.
AD
oP
Panel
Motor
—
assembly
|
|=
Ae
|
omen
EN
Base
Dust
cover
Loosen
insulator
attachment
screws
@
and
remove
the
insulator.
(Do
not
mix
the
color-
coded
float
springs.
They
must
be
replaced
with
their
original
insulators
during
reassemb-
ly.)
.
Remove
the
rear
panel
PU
cord
strain
relief.
-
Unplug
the
2P
and
5P
connectors.
.
Completely
remove
the
PU
cord
from
the
panel.
Lift
up
the
headshell
end
of
the
tonearm,
and
taking
care
not
to
damage
the
tonearm,
remove
it
from
the
panel.
(Hold
the
tonearm
steady.)
Weight
assembly
Screw
8
Rubber
bush
Control
mechanism
assembly
Insulator
z
Fig.
3-1
Disassembly
3.2
D.D
MOTOR
ASSEMBLY
After
the
panel
has
been
removed,
loosen
the
three
motor
attachment
screws
@
and
remove
the
motor.
3.3
TONEARM
SECTION
Remove
the
tonearm
section
by
taking
out
the
three
arm
base
attachment
screws
@
and
one
ground
wire
securing
screw@.
3.4
CONTROL
MECHANISM
SECTION
After
the
tonearm
section
has
been
removed,
loosen
the
three
control
mechanism
attachment
screws
@and
remove
the
assembly.
Tonearm
PU
plate
Fig.
3-3
Remove
tonearm
3.5
TONEARM
1.
Disconnect
the
tonearm
lead
wires
from
the
PU
board
(See
Fig.
3-2).
Note
that
some
of
the
lead
wires
have
been
soldered
to
the
PU
board,
and
must
be
discon-
nected
with
care.
2.
Loosen
the
set
screw
@
with
a
screwdriver
to
remove
the
PU
plate
under
the
arm
base
(See
Fig.
3-3).
8.
Undo
the
screw
@
securing
the
tonearm
to
the
arm
base
(See
Fig.
3-3).
Tonearm
lead
wires
PU
board
Red
Fig.
3-2
Disconnect
the
tonearm
lead
wires
(Hexagone
socket
screw)
Arm
base
4.
TROUBLESHOOTING
Use
the
following
directions
to
find
the
cause
of
each
type
of
breakdown.
Improperly
adjustment
units
should
be
completely
readjusted.
«
AUTO-RETURN
DOES
NOT
WORK
Change
in
starting
position
adjust-
ment.
Starting
plate
does
not
follow
the
NO
Too
much
grease
between
the
signal
signal
plate.
plate
and
the
cam
YES
YES
Inner
diameter
of
the
starting
plate
hole
is
small.
Protrusions
on
the
caulk
section
of
the
starting
plate
hole.
Not
enough
grease
between
the
starting
plate
and
signal
plate.
After
starting,
incomplete
reset
of
the
NO
The
curved
section
of
the
signal
signal
plate.
(See
Section
1)
plate
is
deformed.
YES
Arm
lead
wire
is
caught
on
something.
PU
cord
is
touching
the
PU
plate.
The
inner
areas
of
records
can
not
be
tracked.
Operator
of
the
detection
lever
is
not
smooth.
Looseness
in
the
PU
plate
attach-
ment.
Section
1
After
performing
the
return
operation,
if
the
curved
section
of
the
signal
plate
and
curved
sect-
ion
of
the
starting
plate
are
not
in
contact
with
surfaces
A)
and
respectively
of
the
cam,
reset
will
be
incomplete
and
the
starting
position
will
be
late.
As
a
result,
the
return
function
may
not
operate
at
times.
In
this
case,
bend
the
signal
plate
©)so
that
dimension
(A)
is
0.5mm
or
larger.
Cam
Fig.
4-1
Incomplete
reset
of
starting
and
signal
plates.
Starting
plate
:
At
least
0.5mm
0
see
ee
IS
it
Bae
Lay
ot
a
a
=»
RETURN
IS
FAST
(RETURN
AT
1mm
PITCH)
Protrusions
on
the
pinion
gear
section
(See
section
2)
Section
2
Pinion
gear
If
there
are
rough
areas
of
plastic
protruding
Protruding
section
from
the
(A)
section
of
the
protruding
section
of
the
pinion
gear,
the
return
function
may
operate
at
a
pitch
of
only
1mm.
In
this
case,
remove
the
Fig.
4-2
Elimination
of
pinion
gear
protrusions
plastic
protrusions
completely
(Fig.
4-2)
»
MOTOR
DOES
NOT
ROTATE
2P
and
5P
connectors
are
not
attach-
ed.
YES
Connector(s)
is
not
properly
installed.
=
MOTOR
DOES
NOT
STOP
The
switch
lever
and
switch
locker
No
The
installation
location
of
the
PU
are
not
locking
(See
section
3)
plate
is
incorrect.
Section
3
|
PU
plate
In
order
to
turn
the
power
OFF,
the
PU
plate
shaft
touches
surface
®
of
the
switch
locker
pushing
it
over
so
it
locks
with
the
switch
lever
turning
the
microswitch
OFF
(Fig.
4-3).
If
the
amount
of
push
on
the
switch
locker
is
insuf-
ficient,
it
can
not
lock
with
the
switch
lever.
With
the
tonearm
locked
in
the
arm
rest,
as
shown
Switch
lever
|
in
figure
4-4,
attach
the
PU
plate
precisely
mid-
Mads
rel
Peers
Gr
switch
Iocker
way
between
the
first
and
second
points
from
the
arm
base
scale
mark
counting
away
from
you.
Pte:
Arm
base
scale
mark
Fig.
4-4
Adjustment
PU
plate
«
MOTOR
ASSEMBLY
NOTE:
The
IC
PA2008
used
in
the
PXM-090
does
not
have
a
dedicated
ground
pin
for
its
internal
circuitry,
but
uses
the
thermal
fan
ground.
When
replacing
the
IC,
make
sure
the
securing
screws
retaining
the
ground
line
between
the
IC
and
thermal
dissipator
and
between
the
thermal
dissipator
and
motor
base,
and
base
to
circuit
board
is
securely
tightened.
e
Motor
Does
not
Turn
are
Component
connected
to
Is
Vee
1
29
volts?
Me
rh
supply
circus
detec:
PA2008
terminal
4
defec-
YES
:
tive.
LA
ane
eae
term
NG
PA2008
defective.
NO
YES
Is
PA2007
terminal
11
less
|no
|
PA2007
defective
or
parts
Poor
PA2008
Tab
terminal
than
3.5
volts?
connected
to
PA2007
to
GND
contact.
YES
terminal
11
defective.
Is
PA2008
terminal
3
|NO
PA2008
defective
over
1.0
volt?
;
®
Motor
Does
not
Stop
Hall
element
defective
or
Hall
element
bias
resistor
defective.
Is
Hall
voltage
DC
bias
Ha:
15-17
volts;
Hb;
4-6
volts:
When
the
motor
is
rotated
by
hand,
is
Hall
voltage
(Ha,
Hb)
generated?
If
resistance
is
high,
coil
wire
is
open;
if
resistance
is
low,
PA2008
is
defective
or
coil
is
shorted.
R5_
defective
or
printed
circuit
open.
With
power
OFF,
is
DC
resistance
between
PA2008
terminals
12—14
and
1—13
60
ohms?
With
power
OFF,
is
DC
resistance
between
PA2008
terminals
7—2
3.9
ohms
YES
PA2008
defective.
e
Motor
Runs
away
Is
Vee
1
29
volts?
NO
Power
supply
circuit
de-
fective.
YES
:
—
|NO
NO
Is
PA2008
terminal
4
10
PA2008
defective.
Parts
connected
to
PA2008
11
volts?
terminal
4
defective.
YES
: :
NO
Is
FG
signal
input
to
?
PC
pattern
open
in
FG.
YES
Parts
connected
to
PA2007
;
NO
serie
oir
i
to
terminal
13
defective
or
PC
ermina
‘
pattern
open.
YES
PA2007
defective
or
parts
connected
to
PA2007
terminal
14
defective.
Is
FG
signal
output
from
PA2007
terminal
14
over
12V
p-p?
NO
YES
Slow
down
the
motor
at
about
33
1/3
rpm
with
a
;
hand,
is
the
prescribed
NO
PA2007
defective
or
Cl
defective.
waveform
output
from
PA2007
terminal
4?
YES
Slow
down
the
motor
at
aoe
33
1/3
rpm
Wes
a
|No
PA2007
defective
or
C3
hand,
is
the
prescribed
:
defective.
waveform
output
from
PA2007
terminal
1?
YES
PA2007
defective,
or
C2
defective,
or
parts
connect
When
the
motor
is
stopped
by
hand,
is
the
output
Is
the
potential
between
PA2007
terminal
5-6
0.5—0.8
volts?
between
PA2007
terminal
5-6
defective.
from
PA2007
terminal
11
less
than
3.5
volts?
YES
PA2008
defective.
5.
PRECAUTIONS
FOR
REASSEMBLY
Follow
these
directions
and
precautions
when
reassembling
a
unit
after
completing
repairs.
Be
sure
to
lubricate
as
required,
make
no
mistakes
when
attaching
parts,
and
avoid
all
other
careless
mistakes
that
may
be
the
cause
of
trouble
later
on.
5.1
AREAS
THAT
REQUIRE
LUBRICATION
NOTE:
Types
of
lubricants
and
areas
where
they
are
used
are
listed
in
table
1.
Table
1
Areas
used
Type
of
Oil
Silicon
Oil
#50000
raising
shaft
GYA-008
all
other
areas
Lubrication
points
are
specified
for
oils
other
than
GYA-008.
Never
use
a
different
type
of
oil.
e
Cam
Section
Apply
oil
to
the
heart-shaped
grooved
section
(rear
side
of
the
cam)
and
lock
plate
sliding
section
in
order
to
minimize
wear
on
the
sliding
section
and
the
burden
on
the
mechanism.
e
Driving
Plate
Assembly
Decrease
the
burden
on
the
mechanism
and
the
wear
on
the
sliding
section.
Sides,
top,
and
bottom
surfaces
e
(sliding
section
of
auto-stop
S
mechanism)
Sides
surface
(sliding
section
of
auto-stop
mechanism)
Top
and
side
EV
cam
side
surface
(sliding
section
of
elevation
cam)
Fig.
5-1
Driving
panel
assembly
section
switch
locker
section
¢
Switch
Locker
Section
Apply
oil
to
the
switch
locker
(opening)
and
sub-panel
base
sliding
section
to
decrease
the
burden
on
the
mechanism.
When
applying
oil
to
the
opening
(shaft
hole),
do
not
apply
any
oil
2—3mm
from
the
bottom
surface.
If
oil
is
applied
2—3mm
within
the
bottom
surface,
it
may
come
out
the
bottom
and
go
between
the
switch
lever
and
sub-panel
base
causing
the
switch
lever
to
operate
ineffectively.
10
Switch
locker
Fig.
5-2
Switch
locker
section
e
EV
Lever
Unit
Section
Apply
oil
to
the
sliding
section
of
leaf
spring
(A)
and
EV
lever
unit
to
decrease
the
burden
on
the
mechanism.
Leaf
spring
(A)
sliding
section
EV
lever
unit
4
EV
lever
unit
sliding
section
|
cane
\
Arm
base
\
Fig.
5-3
EV
lever
unit
section
e
Elevation
Cam
Section
Apply
oil
to
the
elevation
cam
and
sliding
sec-
tion
of
the
raising
shaft
to
decrease
the
burden
when
operated.
Elevation
cam
Fig.
5-4
Elevation
cam
section
e
EV
Sheet
Section
Apply
oil
to
the
raising
shaft
and
sliding
section
of
the
bearing
to
assure
stability
in
the
elevation
lowering
speed.
eit
ee
i
Sas)
Sin
et,