Pioneer PL-3000/HB User manual

Service
c
Manual
DIRECT DRIVE FULL AUTOMATIC
STEREO TURNTABLE
L-3000.....
Y PIONEER’

PL-3000
MODEL PL-3000 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:
Voltage Remarks
AC 220V and 240V (Switchable) United Kingdom model (Without AC cord plug)
AC 220V and 240V (Switchable) Europe mode!
AC 110V, 120V, 220V and 240V (Switchable) General export model
AC 110V, 120V, 220V and 240V (Switchable) U.S. Military model
AC 120V only U.S.A. model
@ This service manual is applicable to the PL-3000/HB, HE. For servicing of the other types,
please refer to the additional service manuals.
CONTENTS
1. SPECIFICATIONS .............-020-0008 2 9.1 Schematic Diagram .............000, 21
2. PANEL FACILITIES AND OPERATIONS ..... 3 9.2 P.C Board Connection Diagram ......... 23
3. BLOCK DIAGRAM (IC=PA3006) ........... 5 Q:3:> (Parts: List... 46 a8 and et Roepe ead 25
4. D.D MOTOR TROUBLE SHOOTING CHART
4.1. Motor Fails to Rotate ............... 6
4.2 Considerable Wow and Flutter in Motor ... 7
4.3. Motor Runaway ..............-2--- 8
4.4 Rotational Speed Adjustment .......... 8
5. OPERATION AND ADJUSTMENT OF
TURNTABLE DRIVE MECHANISM
5.1 Auto Leadin............. 000200 ee 9
5.2 Auto-Return ... 2.2... 0.0.2 eee ee ees 10
5.3. Manual Operation.................. 11
5.4) -Auto-Cuts occ Sie age ee Re wf aa ean 11
5.5 Adjustments............-- 00 ee eee 11
6. DISASSEMBLY
6.1 Base and Panel ..........-....0006. 13
6:2:> MOTOR waco Bee Bo we eee dees 13
6.3. Sub-panel Assembly and Tonearm Base.... 13
6.4 Tonearm.......... 2-0 eee ee 14
6.5 Push-button Unit .................. 14
7. EXPLODED VIEWS ................0-0. 15
7.1. Sub-panel Assembly (PXB-043) ......... 17
FQ? TONGAN oie coe ea ee ee a ee 18
7.3. Motor Assembly (PXB-031) ........... 19
Bi PACKING dors foie eR th woe Pad Ate 20
9. SCHEMATIC DIAGRAM, P.C BOARD
PATTERNS AND PARTS LIST

1. SPECIFICATIONS
Motor and Turntable
Drive System... 0.0.00... eee eee eee Direct-drive
MOLOP st oc sh tecaieldd a. tatie ite is ene DC servo motor
Turntable Platter. . . 310mm diam. aluminum alloy die-cast
Moment of Inertia... .. 220kg-cm? (including platter mat)
Speeds... wea Sr ete sb es 33-1/3 and 45rpm
Speed Control Range... .......2200.00000... 42%
Wow and Flutter........... Less than 0.03% (WRMS)
Signal-to-Noise Ratio. ........ More than 73dB (DIN-B)
Tonearm
TY PGs. eee sa ee Static-balance type, S-shaped pipe arm
Effective Arm Length ................... 221mm
OVERMAN Be os eiieca baie! Quid se Mn Pete era doaely Bvtleaes 15.5mm
Usable Cartridge Weight......... 4g (min.) to 9g (max.)
Subfunctions
Full auto mechanism, Anti-skating force control, Stylus
pressure direct-readout counterweight, Strobe light, Free
stop hinges
Semiconductors
Transistors,
sc
24s
decd
a
dl
4
eit
oe
eee
eee
ee
2
DIGG
eS.
oh
ts
a
dirt
ns
apie
calc
Sins
Doty
7
Hallelements....
0.0.0.0...
0000.
eee
ee
eee
ees
3
ee
RRs
Oe
a
ts
Be
oh
gs
ssScn
Bt
e deaa
a
tad
a
ah
1
Miscellaneous
Power Requirements:
PL-3000/HB, HE .. 220/240V~(switchable), 50, 60Hz
Power Consumption ..........0. 000 c cee e eee 7W
Dimensions .......... 384(W) x 145(H) x 360(D) mm
15-1/8(W) x 5-11/16(H) x 14-3/16(D) in.
WEIBAE ais 25 oe ede es 4 7.9kg/17 Ib 7 oz
PC-150 Specifications
TY POs oi tad Pawel tau vee 8S Moving magnet type
SEYIUS 0-245 Cerna 4 See A ntiee 0.5 mil diamond (PN-150)
Output Voltage.............. 3.5mV (1kHz, 50mm/s
Peak velocity, LAT)
Tracking Force............ 1.7g to 2.5g (proper 2.2g)
‘Frequency Response ............... 15 to 30,000Hz
Accessories
EP adaptor sc.ahdiud.n eb aed phot bac a Gheehane x 1
Screwdriver... 0.0.0... 2c cee cee ene eee ]
Operating instructions (French & German
furnished
on
models
for
HE)
..............000-
1
-
FOR USE IN UNITED KINGDOM
CAUTION 240V: MAINS SUPPLY VOLTAGE IS
FACTORY ADJUSTED AT 240
VOLTS.
IMPORTANT
The wires in this mains lead are coloured in accordance
with the following code:
Blue: Neutral
Brown: Live
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured mark-
ings identifying the terminals in your plug proceed as
follows.
The wire which is coloured blue must be connected to
the terminal which is marked with the latter N or
coloured black.
The wire which is coloured brown must be connected to
the terminal which is marked with the letter L or
coloured red.
The power cord should be connected last, make sure
that the power switch is off.
Unplug the set from the wall socket when it is not be
used for an extended period of time.
NOTE:
Specifications
and
design
subject
to
possible
modification
without notice, due to improvements.

2. PANEL FACILITIES AND OPERATIONS
SPEED SELECTOR BUTTON
45 .... When this button is depressed, the platter will
rotate at 45rpm. Depress for playing 45rpm
records, singles or EP’s.
33. .... When this button is set to the released position,
the platter will rotate at 33-1/3rpm. Release
for playing 33-1/3rpm records like LP’s.
SPEED ADJUSTMENT KNOB
Turn this knob when delicately adjusting the speed of the
platter. The speed of platter will increase when the knob
is turned clockwise, in the direction of ‘‘+”; it will
decrease when turned counterclockwise, in the direction
of ‘‘—”, For detailed instruction, refer to the section
“ADJUSTING THE SPEED OF PLATTER”.
STROBE LIGHT/SPEED CHECKING WINDOW
The strobe light comes on when the START/CUT button
is depressed, and the stroboscope illuminates the design
cut around the bottom face of the turntable. The speed of
the platter can be checked by observing the movement of
markings through the checking window. (Refer to ‘“AD-
JUSTING THE SPEED OF PLATTER”’).
RECORD SIZE SELECTOR
This selector selects the size of the record for automatic
play and also selects manual play.
7” 17... For the automatic play of 17cm (7-inch)
LP and EP records.
10” 25... For the automatic play of 25cm (10-inch)
LP records.
12”°30 .. For the automatic play of 30cm (12-inch)
LP records.
MAN... For the manual play of records.
NOTE:
The tonearm will not be actuated when the RECORD
SIZE SELECTOR is at the MANUAL position for play,
even if the START/CUT button and the REPEAT
buttonare pushed.
REPEAT BUTTON
Push this button when you want to listen to the same
record again. Press the button once more to release.
NOTE:
All you have to do for repeat play is to press the
REPEAT button. There is no need to push the START/
CUT button again.
START/CUT BUTTON
When this button is depressed, the power is turned on for
the turntable, the strobe light comes on and the platter
starts to rotate. With the RECORD SIZE SELECTOR
set at one of the positions — 30, 25, or 17 — the tonearm
moves
automatically
to
the
record
disc
as
the
platter
starts
rotation, thus starting record playing.
If this button is depressed while the record is playing, the
tonearm automatically returns to the arm rest, and the
power to the turntable will be cut off.
PLATTER/PLATTER MAT
When
the
tonearm
is
moved
and
power
is
supplied
to
the
turntable,
the
platter
will
start
rotating
at
the
set
rotation
speed.
The platter mat stabilizes the records and also absorbs ex-
ternal vibration.
ADJUSTING THE SPEED OF PLATTER
1. Observe the stroboscope through the speed checking
window. Four different pitches of the markings are
used in the stroboscope. The pitch varies with the
power line frequency and the rotating speed of the
platter, as shown.
. Make sure one of the four types of stroboscope
markings
is
set
according
to
the
line
frequency
and
the platter speed, and turn the SPEED ADJUST-
MENT
knob
as
instructed
in
the
following
to
make
adjustment.
@ When markings appear to stand still: The platter is
turning at the rated speed (33-1/3 or 45rpm), and
no adjustment is required.
When markings appear to move rightwards: The
speed of the platter is lower than the rated speed.
Turn the knob clockwise until markings appear to
stand still.
When markings appear to move leftwards: The
speed of the platter is higher than the rated speed.
Turn the knob counterclockwise until the mark-
ings appear to stand still.
PL-3000
DUST COVER
Keep this closed unless operating the controls or tonearm,
or changing over records. This serves to keep dust from
adhering to the records during record play. When fully
opened and pulled straight up, this dust cover can be
removed from the cabinet.
EP ADAPTOR/ADAPTOR RETAINER
When playing an EP record, fit this adaptor to the center
shaft. When not in use, attach it to the adaptor retainer.
ANTI-SKATE KNOB
This knob is used to cancel out the harmful skating force
which is generated during record play.
ARM REST/CLAMPER
The arm rest supports the tonearm when it is not being
used. Set the tonearm on its rest when it is not playing
records, Clamp it into position if you don’t have any
immediate plans to play records.
TONEARM
This tonearm is designed to ‘apply the correct tracking
force to the cartridge and to keep this force at the precise
level for faithful tracking of the record grooves.
OODOD0O00O0
C0
°@
For
45rpm
in
50H2z
area
00000
0
Oo oO
For
33-1/3rpm
in
50Hz
area
For 33-1/3rpm in 60Hz area
For 45rpm in 60Hz area

3. BLOCK DIAGRAM (IC = PA3006)
+Vcc18V
(to Vec) i
SWITCHING
CONSTANT
CURRENT
r---
Supply of current
WT VT
VTL TTD TM
VTE WT WT
DD Motor Operation
The control circuit employed in the PL-3000
turntable is an IC version of the control circuit
in the PXM-030 D.Dmotor turntable. Opera-
tion is basically the same, and has already been
described in the ‘Additional Service Manual”
(ART-292 ) for the PXM-030.
Position Detector Hall Element Output and Coil Current
4.D.D MOTOR TROUBLE SHOOTING CHART
4.1 MOTOR FAILS TO ROTATE
Does 18V register between Q, emitter
and ground ?
YES
Check that external connections are
normal (including pitch VRs and motor
connector plug).
YES
Does 6.3V (to Vcc) register at pin no.7 of
PA3006 ?
YES
Does the voltage across pins 6 and 7 of
PA8006 register 3.4V for 33 rpm, and
3.6V for 45 rpm ?
NO
YES
Does the voltage across pins 4 and 7
of PA3006 register 2.9V ? (Connect the
positive probe of the multimeter to pin
no.4 , and the negative probe to pin
no.7).
YES
Does the voltage across pins 7 and 9
of PA38006 register about 1V ?
(Connect positive probe to pin no.9, |NO
and negative probe to pin no.7).
YES
Defective Q,, @Q,, Ds. or other
circuit components in the power
supply stage.
Defective PA3006.
Are the same voltage readings
obtained when measuring after dis-
connecting terminal no.12 of the
printed circuit board ?
Defect in the reference bias circuit
consisting of R,;~R,, VR,,VR2, Di
and D,.
Defective PA3006.
Defect in the speed detector circuit
consisting of Ryg~R,,,C,,C3, and
D3;~D,.
Deffective PA3006.

PL-3000
e Includes motor dead point
e Rotate Motor by hand.
Do the voltages between each of the Hall
element outputs (pins 11 and 12, 13 and
14, and 15 and 16 of PA3006) register
at least 0.2V ?
And are all the DC levels at least 9V ?
Defective Hall element.
Turn the power off, and measure the
resistance between Vcc and pins 18, 19,
and 20 of PA3006. (connecting the
positive probe of the multimeter to Vcc).
Is a reading of 602 + 40 obtained in
each case ?
Does 0.8V register between pin no.17 of
PA3006 and ground ?
Defective PA3006 ?
Infinite resistance: break in coil
Resistance too low: shorted coil
4.2 CONSIDERABLE WOW AND FLUTTER IN MOTOR
Check the Hall element operation (see@
Turn the power on, and rotate the turn-
above under “Motor Fails to Rotate’’).
table platter slowly (about 1 rotation in
5 seconds). Do the voltages at pins 18,
19, and 20 of PA3006 switch back and
forth between 18V and 1V ?
Check the coil (see @ and @ above
under the same ‘‘Motor Fails to Rotate”
section).
YES
Defective diode.
Even if only 1 diode is defective, all 3
must be replaced as a single set.
Remove D;, D,, and D;, and check
them for normal conduction with the
multimeter).
YES
When measuring with a wow and flutter meter,
1 deflection per revolution indicates a lack of mechanical alignment, or defective shaft
or shaft bearing,
1 deflection per 2 revolutions indicates a defective shaft or shaft bearing,
while 4 deflections per revolution indicate defective capacitors (C; ~~ C,) or PA3006.

4.3 MOTOR RUNAWAY
Check power supply voltage and wiring connections.
Does the voltage between pins 6 and 7 of
PA3006 register about 3.4V ?
Defective reference bias circuit consist-
ing of R, ~ R,, VR,, VR,,D,, andD,,
or defective PA3006. (Refer to the
“Motor Fails to Rotate”’ section).
Hold the turntable platter still by hand,
and measure the voltage at pin no.4 of
PA3006. Does the voltage register 2.9V,
and then 3.4V when the platter is re-
leased at 33 rpm ? In other words, does
the voltage increase as the rotational
speed increases ?
Defective PA3006.
4.4 ROTATIONAL SPEED ADJUSTMENT
If
correct
speed
cannot
be
attained
by
adjusting
the
pitch
controls,
adjust
the
motor
in
the
follow-
ing
way.
[
1.
Set
the
pitch
controls
to
the
center
positions.
|
|
—
2
Defective speed detector circuit consist-
ing of Rg ~ R,,, C,, C3, and D; ~ D,.
. Turn the power on, and adjust VR, and VR,
in turn to obtain accurate rotational speeds at
45 rpm and 33-1/3 rpm respectively (i.e. when
stroboscope appears to be stationary).
Screw driver ae
VRi (33 45 rpm)
VR2 (45 rpm)
Fig. 1

PL-3000
5. OPERATION AND ADJUSTMENT OF TURNTABLE
DRIVE MECHANISM
Feed plate
Return lever
Actuator
Microswitch A
Crank lever
Microswitch B
Rotary cam
Disengage lever __]
Short switch
PU plate screw
Selector plate
Operation plate
PU plate shaft
Lock lever
Fig. 2. Drive mechanism when stationary
5.1 AUTO LEAD IN
When the START or REPEAT button is pressed,
power is applied to the Timing motor, and the
rotary cam commences to rotate. By the time
this cam has made half a turn (commencement of
record play), the following operations will have
been completed.
1. When the cam commences to rotate, micro-
switch A is turned on to start up the DD
motor.
2. The crank lever coupled to the cam rotates the
operation plate.
3. The start lever commences to move at the same
time as the operation plate, resulting in the
lock lever engaging the PU plate shaft (see
Fig, 3-a).
4. As the cam rotates further, the lock lever
together with the start lever moves the tonearm
across to the position determined by the
selector plate.
5. The start lever stops when it meets the selector
plate (see Fig. 3-b A point).
6. Although the start lever stops, the operation
plate continues to rotate, consequently releas-
ing the lock lever from the PU plate shaft (the
lock lever being pushed out by contact with
the operation plate at point B).
. As the operation plate continues to rotate, the
tonearm elevation is lowered until the stylus
lands on the record surface (see Fig. 5).
Selector plate
Start lever
Lock lever
Fig. 3-a Fig. 3-b

10.
. As soon as this lowering operation is complet-
ed, the cam will have completed exactly half
a tum. Since the actuator drops into the con-
cave section of the cam, microswitch B (base)
is turned off to stop the Timing motor.
. At the same time that the Timing motor is
turned off, the switch shorting the cartridge
output terminal is turned off (thereby dis-
connecting the muting circuit).
As the record commences to rotate, the tone-
arm is drawn across to the center of the record
(Fig. 5).
5.2 AUTO-RETURN
1.
10
As the tonearm approaches the lead-out groove
of the record, PU plate screw presses against
the feed plate, thereby moving the stopper
towards the center shaft (see Fig. 6).
. Once the stopper snaps back by the pin at-
tached to the motor, microswitch B (lower
side) is turned on by the return lever, resulting
in power being applied to the Timing motor
(see Fig. 6).
Nos. @ to @ in Fig. 6 indicate the sequence
of events up until the Timing motor com-
mences to rotate.
. The cam rotating together with the Timing
motor also rotates the operation plate via the
crank lever, the cartridge output being shorted
during this rotational operation by the short
switch.
. Rotation of the operation plate activates the
arm lifter, thereby lifting the tonearm away
from the record.
. The return lever on the operation plate then
commences to return the PU plate shaft in
order to return the tonearm to the arm rest
(see Fig. 7).
. After the tonearm has been returned to the
arm rest, the rotating cam switches off the
power to the main motor, and to all other
parts of the PL-3000 (microswitch A is turned
off when the upper side of the actuator drops
into the concave section of the cam).
Actuator
Short switch
Microswitch
Fig. 4
PU plate shaft
Fig. 5
Fig. 4, Fig. 5 Drive mechanism during record play
(Cam rotated half a turn)
Stopper
Feed plate
PU plate screw
Crank lever
Microswitch A
Microswitch B
| O
Rotary cam Disengage lever
Fig. 6

Operation plate
PU plate shaft
Return lever
Fig. 7
5.3 MANUAL OPERATION
e Start by pressing START button first
1. Set the RECORD SIZE SELECTOR to the
MANUAL position.
2. When the START button is then pressed, and
the Timing motor commences to rotate, the
operation plate will also commence to rotate,
resulting in the lock lever together with start
lever holding the PU plate shaft.
3. In the same position that the PU plate shaft is
held, the start lever meets the claw of the
selector plate, and consequently stops.
After the operation plate rotates a little fur-
ther, the operation plate shaft separates the
lock lever from the PU plate shaft.
4. Asthe operation plate continues to rotate, the
elevation pin drops down when the sloped
portion of the plate is met. The Timing motor
subsequently stops when the operation plate is
pushed round as far as it will go.
5. Raise the tonearm by hand, and lower the
stylus onto the record to commence play.
The return operation in this case is the same as
described above under section 5.2.
e Start by first moving tonearm across to the
record
First lift the tonearm and move it across to
above the record, and then press the START but-
ton. The Timing motor will commence to rotate,
and operation plate will start to move, resulting in
the tonearm being lowered in the same way as de-
scribed before.
PL-3000
5.4 AUTO-CUT
When the CUT button is pressed, power is
applied to the Timing motor, resulting in the same
sequence of events as described in steps 3 to 6
under section 5.2.
5.5 ADJUSTMENTS
Prior to commencing any adjustments, check
that the PU plate shaft moves along the center axis
of the slot in the sub-panel as shown in Fig. 8.
Fig. 8
e Tonearm lowering position
Tonearm lowering position is adjusted by turn-
ing an adjustment screw located in the hole at the
base of the tonearm (see Fig. 9).
Turn the screw clockwise to move the lowering
position inwards.
Turn the screw counterclockwise to move the
lowering position outwards.
This adjustment may be simplified by using a
test record .
Adjustment screw
Screw driver
Lowering position
Lowerin ition °
GiPOsItIO too far in
too far out
O) 0)
Fig. 9
11