Yamaha PX-2 Owner's manual

Yamaha PX-2 Owner's manual
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OWNER
YAMAHA thanks and congratulates you
on your purchase of
the YAMAHA Linear Tracking Stereo Turntable Unit, PX-2.
The PX-2 uses for its tonearm section
a linear tracking straight arm
with excellent tracking ability,
in addition to
a direct drive turntable driven by a DC 4-phase,
8-pole coreless Hall motor
| with a starting torque of not less than 1 kg-em.
Fasy-to-operate because of its fully automatic control functions,
the PX-2 represents the best in record playing systems.
CONTENTS
Features .. 11202224 4 4 4 4 4 6 0 4 4 4 4 eee 2
CAUTION - Read This First . . ............ 3
Before Assembly and Accessories... ......... 4
Assembly and Connections . . ............. 5
Identification and Functions of Controls. ..... 7
Adjusting the Tonearm. . . . .............. 9
Howto Play Discs. . .. . .. vc vv vv vv viv 10
Specifications. . . ... ee 11
Trouble Shooting .................... 12
Block Diagram . . . . ... «iin... 13
Schematic Diagram .........e.. eee... 14
FEATURES
Linear Tracking Straight Arm
Employing a linear tracking arm that boasts a
horizontal tracking error angle of within +0.15”,
offset angle and inside force of “0”, the PX-2
features reproduction of clearer sounds with less
distortion than conventional Swing type tonearms,
And because of its tonearm height adjusting
mechanism, it enables stroke changes within
+4mm, and accepts practically all kinds of
cartridges currently available on the market,
Fully Automatic Control Mechanisms
By intergrating the disc-size selector with the
PLAY switch of the turntable, the unit is provided
not only with automatic control functions that
enable one-touch AUTO LEAD-IN, AUTO-RE-
TURN and REPEAT play, but also with manual
control functions that enable speed change, CUE-
ING UP, CUEING DOWN and LEAD-IN and
LEAD-OUT without opening the dust cover,
Quartz Oscillator Phase-Locked Turntable
The speed of revolution of the DC 4-phase,
8-pole coreless Hall motor (Starting torque: Not
less than 1 kg:cm) is locked by a PLL ( Phase
locked loop) mechanism, which uses the oscillat-
ing frequency of a quartz crystal oscillator as
its reference frequency. Freedom from tempera-
ture- and time-induced drift and temporal changes
ensures, stable and powerful rotation of the
turntable with speed accuracy as high as +20 ppm,
or better. When steady rotation of the platter is
achieved, the LOCKED indicator lights up to indi-
cate phase-lock.
Heavyweight Platter and Mat
This platter, which measures 31 cm in diameter,
weights 2.1kg and has a moment of inertia of 270
kg-cm? (both figures including the rubber mat).
Wow and flutter have been suppressed to the
minimum and smooth rotation ensured.
Heavyweight Cabinet and Dust Cover
The cabinet is made of 5 mm-thick aluminum
diecast panels featuring high rigidity. The heavy-
weight-class body weights 17 kg in total.
The dust cover is made of 5 mm-thick, 1.3 kg. This
design protects the turntable unit from harmful
external vibrations and provides resistance against
‘howling’ (acoustic feedback from speakers).
Other Features
Other features include a constant-voltage power
circuit providing sufficient allowance and operat-
ing properties. In addition, the PX-2 has been
designed to provide the user optimum ease of use,
with many features exclusive to Yamaha. At
Yamaha, we're always a few steps ahead of other
audio makers.
WARNING
To prevent fire or shock hazard, do not
expose this appliance to rain or moisture.
IMPORTANT!
Please record the serial number of your unit
in the space below:
Model Name: PX-2
Serial No.
The serial number is located on the rear of
the chassis.
Special Instructions for British Model
IMPORTANT!
The wires in the 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 markings identifying the ter-
minals in your plug, proceed as follows. The
wire which is coloured BLUE must be con-
nected to the terminal which is marked with
the letter N or coloured BLACK. The wire
which is coloured BROWN must be con-
nected to the terminal which is marked
with the letter L or coloured RED.
[J Location of installation.
Avoid placing the PX-2 where its total quality will
be illaffected, or malfunctions result, from excessive
heat (in direct sunlight or near heating equipment),
cold, humidity or dust.
[J Use of benzene or thinners is to be strictly
avoided,
Do not wipe the cabinet with chemical solvents
(such as benzene or thinner), or spray aerosol-type
insecticides near the machine. Adhesion of benzene,
or thinner will cause stains or discolor the cabinet.
Be sure not to let record spray reach the cabinet
when cleaning discs. Clean only with a soft, dry
cloth.
L] Handle with care.
Careless handling — knocking against it, dropping
something on it — may damage the product and
deteriorate performance. Be sure to handle it with
care.
[] Select à place free of vibrations.
Do not place the PX-2 in locations subject to high
vibrations, or close to a speaker system. Select a
firm base to place it upon.
[] Avoid using an old, worn down stylus.
The service life of a stylus differs according on the
condition of discs but, in normal use, a diamond-
tip stylus should be replaced after 200 - 300 hours
of use. Using a worn-down stylus may cause distor-
tion, ‘’scratchness’’ and damage to discs.
CAUTION-READ THIS FIRST
[} Handle the power cord with care; grasp the plug
when removing the cord from the AC outlet socket,
(1 Place at a sufficient distance from amplifiers.
When installing in parallel with the audio amplifier
to which it is to be connected, place the PX-2 so
that the tonearm will be as far away as possible
from the power transformer side of the amplifier,
Also be sure to keep the output cord separated at a
distance from the power supply.
[J Keep it level,
Speed of revolution and tonearm movement will be
adversely affected if the turntable is not properly
jeveled.
[] Moving and transportation.
When it is necessary to move the unit — for example,
to change the layout of the listening room — be sure
to keep the unit level. If tilted, there is danger of
the arm unit slipping out. When transporting it
when moving to another house, pack it firmly to
protect the arm unit, (Refer to Page 4.)
[J If a foreign object falls inside.
The section the tonearm moves over is of an open
construction for mechanical reasons: special
attention should be paid not to drop any foreign
object inside, If something should fall inside, turn
off the power switch immediately and remove the
object. 1f it has fallen into an inaccessible place, do
not attempt to open the cabinet; instead, contact
vour local YAMAHA dealer or service representative,
[] Keep this Owner's Manual in a safe place for
future reference.
[] The voltage selector switch on the cabinet of the
PX-2 must be set for your local mains voltage
BEFORE plugging in the AC main supply. Voltages
are 110/120/130/220/230/240 V AC, 50/60 Hz.
(General Model Only)
Г ® Y VOLTAGE SELECTOR
(General Model Only)
U.S.A., Canadian and British Models
The following “CAUTION” label is attached
to the cabinet.
E SNA UN
EN EL
tener).
PX
Removing the transit screws
The arm unit has been secured with screws on the
rear side, and by an arm fixing plate on the front
in order to protect the arm unit from vibrations,
etc. during transport. Remove the screws and
fixing plate before using the PX-2. Keep the screws
together with the carton box for future transport.
1. Remove the transport fixing plate. (Front side)
When transporting, do not forget to resecure the
tonearm. Lower the tonearm unit to its lowest
position. Firmly tighten the LOCK A knob and
fix it in position with the arm fixing plate and
vinyl string.
BEFORE ASSEMBLY AND ACCESSORIES
2. Remove the three transport fixing screws. (Rear
side)
When transporting, do not forget to resecure the
arm unit with the fixing screws.
To remove the fixing screws {and also to fix the
arm unit for re-transport), raise the rear side of
the unit.
Phillips
screwdriver
у Remove the vinyl string before
Fixing unscrewing the two fixing screws.
screws (2)
Fig. 1
ransport fixing screw
;
Fig. 2
How to fix the arm unit for transport
When it is necessary to transport the unit, the arm
unit should be fixed without fail in the following
sequence to protect the arm unit. Failure to secure
the arm unit when the unit is to be transported
may lead to disorders.
1. After moving the tonearm to the extreme right,
disconnect power. Then, remove the platter,
headshell, dust cover and main weight,
2. Referring to Fig. 2, fix the arm unit in place
with the three transport fixing screws.
3. Referring to Fig. 1, fix the tonearm in place with
the arm transport fixing plate.
Be careful not to over-tighten the fixing screws.
Accessories
Dust cover
hinges Cartridge set screws EP adaptor
(l=16mm x 4, [=10mm x 4)
Serial nuts {x 2)
Washers {x 4)
ГГ >
Te] [ea] =i &
= L À
Cap
Headshell
Cartridge setting
Main weight Sub-weights gauge
Mounting the platter
1. Hold the platter as illustrated in Fig. 3 and fit it
gently onto the center shaft.
2. Place the rubber mat over the platter.
Rubber mat
Fig. 3
- ==
ASSEMBLY AND CO NNECTIONS
Fitting of cartridge
The head shell of the PX-2 permits attachment
cartridges within 5~11g without using sub-weights.
When fitting the cartridge onto the head shell, con-
nect the lead wires of the head shell to the pins of
the cartridge correctly,
_— Cartridge
set screw
Cartridge |
(5 — 119) <p — serial nut
Fig. 4
® Cartridges in the weight range of over 11g up to
16g can be used by removing the left and right
caps of the main weight as shown in Fig. 5 and
fitting on the supplied sub-weights.
Remove the caps (screw type).
Main weight
Fit on the supplied sub-weights.
Likewise, for the opposite side, remove the cap
and fit on the sub-weight.
Fig. 5
® Do not use cartridges weighting over 11g without
using the sub-weights as it will cause damage to
the stylus tip and disc.
e When using a head shell other than the one pro-
vided as standard accessory, or a cartridge inte-
grated with a head shell that is provided with a
finger hook may come in contact with the dust
cover. If such is the case, replace the head shell
with the standard one, or use ¡t with the finger
hook disconnected, |
e Position to fit cartridge
The cartridge fitting position is determined by
placing a setting gauge against the cartridge as
shown in Fig. 6 and matching the stylus point
of the cartridge with the STYLUS POINT marking
on the gauge. Firmly fix the cartridge in position.
Stylus point
Stylus point —
Fig. G
When fitting on the cartridge, confirm, by viewing
the cartridge from the front, that the cartridge is
properly centered with the head shell. Otherwise,
the tonearm may descend to an incorrect position
when searching out the beginning of a program.
Assembling the tonearm
1.
Push the main weight into the tonearm from
the rear, while turning the black knob of the
main weight in the direction of the arrow as
shown in Fig. 7.
. After the spiral grooves cut inside the main
weight engage with the click stopper on the
rear of the tonearm, the main weight will move
forward smoothly when further turned counter-
clockwise (toward the left when viewed from the
front of the tonearm), and backward, when
turned clockwise (to the right).
. With the projected pin facing upward, insert
the head shell fitted with the cartridge into
the lock nut on the forward end of the tone-
arm. Rotate the lock nut to secure the head
shell firmly.
Attaching the dust cover
1.
Insert the dust cover hinges into the left and
right receptacles provided on the rear of the
cabinet. (Arrow (1) )
. Next, insert the two recessed portions of the
dust cover's rear surface into the hinges. (Insert
both left-and right-side hinges together at the
same time.) (Arrow (2) )
. The dust cover can be freely detached or at-
tached. To remove it, reverse the proceduce
outlined above.
Main weight
x Make sure that the main
welght is fitted on in the
correct direction.
Rear end of
tonearm
Lock nut {Rotate the nut
to secure the head shell
firmly.) -
Cartridge Fig. 7
”.
A
Dust cover
Recessed ss AS
. “ —
portion e 7 _
Hinge
~~
Cabinet Receptacle
Fig. 8
Insulator height adjustment
This unit weights 17 kg.
lt is necessary, there-
fore, to install it on a firm base or table. After
placing it on the base or table, adjust the height
of the insulators to properly level the unit.
Connections
After completing assembly of the platter and tone-
arm, follow the directions given below to connect
the amplifier,
1.
Connect the output cord leading out from the
cabinet’s rear to the PHONO terminal of the
audio amplifier. Do not mistake the L (Left
channel) for the R (Right channel). The white
one is L and the red R. (Fig. 10)
. Connect the black ground wire leading out from
the output cord to the GND terminal of the
audio amplifier. Depending on the type of the
amplifier, however better results with regard to
hum noise may sometimes obtained if the
ground wire is not connected. Choose which-
ever of the two that results in less hum.
. Connect the power cord to an AC wall outlet,
or a spare power supply socket (AC outlet) in
the audio amplifier.
* When the power plug of this unit is con-
nected to a spare “SWITCHED” power
supply socket of the amplifier, the power
switch of the amplifier will be interlocked
with the switch of this unit, permitting
simultaneous POWER-ON. (In this case,
the power switch of this unit should be kept
switched on.)
insulator
Fig. 9
0
„0“
EB
White: L {Left) channel.
Ground wire
Fig. 10
CONTROLS
1 POWER (Power Switch)
When this switch is depressed, power will be
O O a switched on, and the LED (indicator) beneath the
switch will light on. To disconnect power, depress
this switch again.
(2) SPEED (Speed Changing Switch)
This switch functions to change the speed of the
platter.
® When a 33-1/3 r.p.m disc is to be played, depress
the “33” switch, The “33” indicator will iHumi-
aur
DE
: nate.
I e When playing a 45 r.p.m. disc, depress the 45”
: switch. The “45” indicator will illuminate.
When power is switched on, the speed is auto-
matically set to 33 r.p.m.
рии 5
(3) QUARTZ LOCKED (Quartz-Locked In-
, dicator)
i This indicator shows that the platter has attained
stable rotation (for either 33-1/3 or 45 r.p.m.) and
Бо the quartz PLL mechanism has gone into the locked
; condition.
7 ARM CONTROL (MANUAL) —
A a <</< (Leftward Feed Switch for Tone-
E aa 7 3 arm)
The tonearm will be fed toward the left for the
duration this switch is being depressed. When this
switch is slightly depressed, the tonearm will move
slowly, wheras, when depressed to a further depth,
the tonearm will move quickly.
* When the tonearm has moved to the extreme
left, no matter whether the switch is depressed
or not, the arm will not make any further left-
ward movement.
INTEL — — AFTORMATIC
OD © ®
© UP (Cueing-UP Switch)
Depress this switch to discontinue play temporarily.
The tonearm will be lifted, removing the sylus tip
from the disc surface,
DOWN (Cueing-DOWN Switch)
Depress this switch to start play midway on a
disc. The tonearm will lower itself, bringing the
stylus tip in contact with the disc surface.
* When the UP switch, or DOWN switch is depres-
sed, you will hear click. This is neither an ab-
normal noise, not an indication of discorder,
but a sound produced by the operating solenoid
for cueing. Be careful not to depress the UP
switch while the tonearm is descending, as it
may cause the tonearm to fly when the “click”
of the operating solenoid is heard.
7 >/b (Rightward Feed Switch for
Tonearm)
The tonearm will be fed toward the right for the
duration this switch is being depressed. When this
switch is slightly depressed, the tonearm will move
slowly, wheras, when depressed to a further depth,
the tonearm will move quickly.
* The tonearm will come to a halt once it reaches
the extreme right, and the platter will stop
rotating.
AUTOMATIC PLAY
CUT (Play Discontinuing Switch)
Whenever this switch is depressed, the tonearm
will start RETURN movements, whatever opera-
tion mode It may be in.
® REPEAT (Repeat Switch)
Repeat play is possible by depressing this switch,
in line with the disc play controlled by the PLAY/
DISC SIZE switch ( 40).
During REPEAT play, the indicator located above
the switch will illuminate. To end REPEAT play,
depress this switch once again.
* For performances initiated with the ARM
CONTROL switches ( through ), RE-
PEAT play is not possible even when this switch
is depressed.
PLAY/DISC SIZE (Disc Size Switch)
This switch makes possible automatic play, by
selecting the disc size (17 cm, 25 cm or 30 cm).
When any one of the switches is depressed, the
indicator of the selected size will illuminate, and
the whole process from the starting of platter, arm
feed, cueing-DOWN, play, auto-return to stop will
be automatically performed.
Be careful not to make a mistake in selecting
the disc size; damage to the cartridge and stylus
tip may result when the wrong disc size is se-
lected.
* When any one of the ARM CONTROL switches
( through (7) ) is depressed, automatic play
will be completely released.
Arm Height Adjusting Knob
After loosening the lock control provided on the
right-side of the tonearm, adjust the arm height,
using the left-side A UP and Y DOWN controls.
On completion of adjustment, lock the arm firmly
by means of the LOCK A control.
2 Main Weight & BALANCE Control Knob
This control functions to balance the tonearm.
When the control is turned counterclockwise
(leftward) as viewed from the front of the tonearm,
the main weight will move forward, and when the
control is turned clockwise, the main weight will
move backward.
(9 Tracking Force Adjusting Weight
This determines the tracking force. Tonearm ba-
lance adjustments are performed by matching the
forward end of the weight with the “0” Jine.
(The forward end of the weight will be the basic
line used for determining the tracking force.)
ADJUSTING THE TONEARM
Tonearm adjustment should be carried out in the order shown below.
(1. Adjusting tonearm balance | mp 2 Adjusting cartridge tracking force mu |3. Adjusting tonearm height |
Adjusting tonearm balance
Once the cartridge is fitted on and the tonearm
assembled, proceed with balance adjustment as
described below:
1. Match the forward end of the tracking force
adjusting weight with the “0” line (the farthest
position) of the tonearm. Ready the tonearm
as if for “Play”, by removing the cover of the
stylus of the cartridge, for example.
2. Switch on the power switch, and then depress
the CUT switch. After confirming that the
tonearrn is at the check right, depress the DOWN
switch of the ARM CONTROL and examine the
level balance of the tonearm. When the head
shell side is too high, the tonearm's head section
XE
Main weight side is too heavy. O
Head shell side is too heavy. O)
{Move main weight backward.)
Balance control knob
Main weight
Perfectly balanced condition o
Fig, 11
will sink, whereas, when the main weight side is
too heavy, the tonearm's head section will rise.
. With the left hand gently applied to the head
shell, revolve the balance control of the main
weight to attain perfect balance.
. When steady balance has been attained, depress
the UP switch,
Adjusting Cartridge Tracking Force
Adjusting cartridge tracking force is to be per-
formed only after the tonearm has been properly
balanced.
1.
Do not change the main weight's position from
where it gives perfectly leveled balance.
. The scale engraved in the tonearm is graduated
in units of 0.1 g. Match the forward end of the
tracking force adjusting weight to the position
on the cartridge that corresponds to the opti-
mum tracking force for that cartridge.
NOTE: Use the tracking force adjusting weight
with its flat surface facing downward,
Adjusting Tonearm Height
1.
2.
3.
Loosen the LOCK A knob.
As if to ready the cartridge for “Play”, for
example, remove the stylus tip cover.
Place a disc on the turntable. Depress the PLAY/
DISC SIZE switch to lower the stylus onto the
disc surface.
. Make sure that the record surface is parallel
with the tonearm pipe, by adjusting the A
UP and V DOWN knob.
. When proper height adjustment has been attained,
firmly tighten the LOCK A knob, with the tone-
arm position unchanged.
Carry this adjustment out very carefully, so that
neither stylus nor disc are damaged.
Optimum tracking
force for
cartridge >
Tracking force
adjusting weight
Tonearm
Fig, 12
Disc surface Tonearm
|
|
|
O
E
=O
Adjust so that the tonearm is
parallel to the disc surface.
ПНП
Height contro! knob
Fig. 13
Before starting disc play, check and confirm proper
connection of power plug, output cord and ground
wire. |
Automatic Disc Play
1. Turn on the POWER switch and place a disc on
the platter,
2. Match the platter speed to the disc speed,
(As the turntable will be automatically set to
"33" r.p.m. when power is turned on, the “45”
button of the SPEED switch should be depres-
sed when a 45 r.p.m. disc is to be played.)
3 Matching it with the size of the disc, depress the
PLAY/DISC SIZE button of that particular size.
HOW TO PLAY DISCS
For REPEAT Play
Start REPEAT play by depressing the PLAY/DISC
SIZE switch and then depressing the REPEAT
switch.
REPEAT play will start at the correct position for
the selected size. Likewise, on completion of disc
play, the disc, through AUTO-RETURN, will
return to this position, and play will be repeated.
To release REPEAT play, depress the REPEAT
switch once again. This will cause the indicator
to go out and the REPEAT play mechanism to
be released. Thus, on completion of disc play,
play will be discontinued, following AUTO-RE-
TURN of the tonearm.
25 30
17
Г
n —— С
30
J
Fig. 14
REPEAT
CUT
Fig. 15
When you wish to skip a portion of music
1. Depress the UP switch of the ARM CONTROL.
The tonearm will rise,
2. Depress either the LEFTWARD FEED, or
RIGHTWARD FEED switch to move the tone-
arm to the desired position. The speed of the
tonearm movement can be controlled in two
steps. This permits fine regulation of the stylus
descending position.
3. Depression of the DOWN switch will cause the
tonearm to descend, initiating disc play. On
completion of the music, the tonearm will
return automatically to complete operation.
* When the ARM CONTROL switch is depressed
during disc AUTO-PLAY, will be released, and
REPEAT-PLAY will be released at the same time
if it has been selected,
This will cause the DISC SIZE indicator to light
up. The platter will start rotating and the tone-
arm will move up to the prescribed AUTO-LEAD-
IN position™ at which it will descend to start disc
play. (AUTO-LEAD-IN)
4, When disc play is finished and the tonearm enters
the LEAD-OUT groove on the innermost side of
the disc, the tonearm will rise and return to the
extreme right, causing the platter to stop at the
same time. (AUTC-RETURN)
“Prescribed position”
The AUTO-LEAD-IN position is set according to RIAA
— specified records, the position at which the stylus will
lower itself may not match discs that do not conform to
RIAA.
When a wrong disc size has been selected
Immediately depress the switch corresponding to
the proper size. This will cause the tonearm to be
transported to the position of the newly selected
disc-size to start play. Another method to correct
the mistake is to depress the CUT switch first and
then depress the proper disc-size switch.
* If, for example, a 17 cm disc is placed on the
platter but the 30 cm disc-size switch has been
depressed by mistake, it will cause damage to
the cartridge and stylus tip. So be extremely
careful not to misoperate the size switches.
<< - UF »/>>
DOWN
r= =x r= ou
Tonearm moves slowly. Tonearm moves quickly.
Fig. 16
10
11
When play is to be started midway in disc
1. Move the tonearm to the desired position, using
the LEFTWARD FEED switch. This will cause
the platter to start rotating.
2. Depress the DOWN switch to lower the tonearm
to start disc play.
3. On completion of disc play, operations will be
completed, following AUTO-RETURN of tone-
arm.
* REPEAT play is not possible when play has been
started with manual operation.
A
DOWN
Fig. 17
When disc play is to be discontinued mid-
way in play
Depress the CUT switch, Play will be discontinued
at that position. Following AUTO-RETURN of
tonearm, operation will be completed.
* To protect the cartridge should power supply be
discontinued because of service interruption
during disc play, or should the power switch be
switched off by mistake, the unit has been
designed so that the tonearm will stop in an
uplifted position. When power supply has been
restored, start operation again.
TONEARM SECTION
Arm type Linear tracking arm
Servo system
Total length
Effective length
Tracking force device
Photo-electric tracking sensor plus servo motor
236 mm (9-9/32")
190mm (7-15/32")
Static balance type sliding weight
system 0 ~ 2.5 q, in 0.1 g steps
Proportional type to tracking force
1.0 g {Tracking force) 16.5 g
1.5 g {Tracking force) 17.09
2.0 g (Tracking force) 17.5 9
Effective mass
(In cartridge-less state}
Applicable cartridge weight range 5-11g
(Using sub-weights } 10 — 169
Maximum horizontal tracking error angle +0,15°
At stylus tip 20.5 mm
Arm lifter Oil damp type cueing
Adjustable range of arm height 14.0 mm
Head shell Pure, forged aluminum, Weight: 8.0 4g
: Plug-in type conforming to EIA Standards
PU Cable NEGLEX 2496
Low-impedance, double cylindrical cord
Capacitance: 130pF
Resistance: 1 2
Cartridge (Not provided) Replaceable
ROTARY SECTION
Motor DC, 4-phase, 8-pole coreless Hall motor
Starting torque 1 kg-em, or more
Drive system Direct drive
Servo system Quartz PLL, Negative/positive two-direction servo
Locking torque 450 g-em
F.G. Total circumference integrating type
Speed (With Lock Indicator} 33-1/3 r.o.m., 45 r.p.m.
Platter 31 cm (12-1/4”) diameter, aluminum die-cast
Weight: 2.1 kg (4.62 Ibs) (including rubber mat)
Moment of inertia 270 kg-em? (Including rubber mat)
SPECIFICATIONS
EXTERNAL DESIGN
Cabinet Aluminum, die-cast, Dmm thick black enamel coating
Dust cover Acrylic, 5mm thick, weighing 1.3kg
Front operating type.
Hinges Free stop, detachable type
Insulator Combination of spring-and -rubber type
with height adjustment
CONTROL SECTION
AUTO-LEAD-IN
AUTO-RETURN
REPEAT
AUTO-U? (During Power-OFF)
17/25/30 em (77/10/12)
Automatic functions
Size selector
Manual funetions ARM-UP
ARM-DOWN
LEFTWARD & RIGHTWARD 2-speed feeding
CUT
Speed 33-1/3 r.p.m. and 45 r.p.m.
Others Power switch
GENERAL _
S/N ratio 80dB (1EC 98A Weighted)
Wow and flutter
Power supply and consumption
U.S.A & Canadian Models
European Model 220V AC, 50Hz … 25W
Australian & British Models 240V AC, bOHz ... 26W
110/120/130/220/230/240V AC, 50/60Hz ... 22W
493 x 156 x 428
(19-7/16°} x (6-5/32") x (16-27/32"")
17 kg (37.4 1b)
0.01% WRMS {FG direct)
120V AC, 60Hz ... 25W
General Model
Dimensions (W x H x D) mm
Total weight
Specifications are subject to change without notice.
If your PX-2 ceases to function normally, check the following trouble shooting list. Only if this fails to restore normal operation should you contact your local YAMAHA dealer or service rep-
resentative.
TROUBLE SHOOTING
Fault
Cause
Cure
Power does not turn on when POWER switch is depressed.
Power cord not completely inserted into wall AC outlet, or
amplifier's spare power supply socket,
Re-insert cord into wall AC outlet, or amplifier's spare power
supply socket.
Balance {zero} cannot be obtained after changing cartridge.
Cartridge is either too heavy, or too light.
The PX-2 handles cartridges in the weight range of bg ~ 11g:
the sub-weights are not needed. When a cartridge of over 11g
is to be used, fit on the sub-weights and perform readjustment,
REPEAT play cannot he effected.
PLAY has been started manually.
Has been manually operated during AUTO-PLAY.
First depress PLAY/DISC SIZE button and then depress
REPEAT button.
No sound is heard, or sound is too faint although the
stylus descends on the disc surface.
Defective contact of head shell connector.
Amplifier’s FUNCTION switch is not positioned to PHONO.
Amplifier's volume is turned down.
Insufficient contact of turntable output cord.
Attach head shell to the tonearm properly.
Set FUNCTION properly to PHONO.
Turn up the volume to an adequate level.
Check and correct connector terminals between amplifier and
rear panel.
The body of the cartridge catches on the disc surface,
Too heavy cartridge stylus tracking force.
Inadequate tonearm height.
Readjust tracking force to optimum.
Adjust to proper tonearm height.
Unpleasant, distorted reproduced sound, with clicking or
crackling sounds. High frequency reproduction is par-
ticularly affected.
Turntable is slanted and not properly leveled.
Dust accumulating on the stylfus tip.
Stylus tip is worn down,
The disc itself is damaged or is dirty.
Stylus tracking force is either too light or too heavy.
Amplifier’s treble response has been overemphasized.
Correct by leveling turntable properly.
Clean stylus tip using special stylus cleaning brush.
Replace the stylus.
Replace with a new disc.
Readjust the tracking force for the cartridge to the recom-
mended value.
Turn the treble control back to the flat position.
Unpleasant reproduced sounds with howling {droning} noise.
Turntable is installed too close to the speaker system, or
resonance has been induced by vibrations because place-
ment of turntable is unstable.
Move turntable to a stabler place, or install it farther away
from the speaker. (Installation in a corner of a room should
be avoided in particular.)
Inclusion of humming noise during disc play.
Ground wire of turntable not connected to amplifier's
GND terminal.
Defective contact of head shell connector.
Connect ground wire to GND terminal. (In some cases, it is
better not to ground it.}
Fit the head shell onto the tonearm correctly,
12
BLOCK DIAGRAM
TONEARM CONTROL CIRCUIT
+ | Gain В Angle
Reference + | Contral | Sensor
Voltage ~ à
Tenearm
(Tracking, Right, Left & Stop)
Tanearm
Feeder
Servo Pull Balt | >
Mator | uiley | =
+ > | | [
Reference _
Voltage Left Arm Righ
ght
+ | Limit | Position Limit
Clock HOLD
Regulation Voltage
— Gain _
Control
+ Band-Pass . Tonearm
Filter - Solenoid (up& DOWN)
„Gain | - |
ontro Y
FAN Arm-Up
VOOCR FL LL PS PP PI RUM D DL. Detector
YAMAHAH YM-294 Tonearm
LE LIT (25 /30ML MR MD AI AZ AS UL vss $
À
LED
| SIZE
PLL Pawer Supply {+12 Decorder
[es | [attr | yes [Come
[roues | El 55 | LEFT] | UP | = 17 | m |
“DC MOTOR SERVO CIRCUIT
| Lock indicator |
Disturbance
102 YC4046 4
; ! For Positive-torque Genaration
Il 5,5296MHz 1/32 5120, 6912 С око 1
Crystal | Freguency Frequenc >
In oscillator - Divider PD S&H
— Power Drive H+ BC Motor - я Platter
|| TN RE ES à
e | em er ООО ЛОНН
2560, 3456 =
Fre 1 и [= Negative
same m [Fv san H—>O =Q=] > fuman” |
A 4
( Negative-torque A 1 |
45: 67.5Hz — Reference Voltage || — —
Polarity
Detection
= 1/2 | Switching +
Freguenc
| Wave Shaper | Grider’ Г
. Reverse Rotation]
| FV Converter H — Detector |
IC3 MSM4013
Frequency |
| Generator |
LA
45/33 Start/Stop
SCHEMATIC DIAGR/
YA-27 TONEARM UNIT
ARM DRIVE MOTOR
M
CARTRIDGE OPTION)
es BOARD)
SENSOR BOARD
SPI 2012
IC!
NJIMAESHD or NIMISSED- I
LEFT LIMIT sw]
BOAR
L5-9:TLA-1D6
4000053
68
XI a xo
25C948ParK, 25087LarK
Xai
28CH45Pork
ic1
Tr3 Tra ICE TrB Tro
NIM4556D 251995 258647 TC40138P 2802320 2862320
Trig
250665
Ll
[C4
FSTEZ4
tes
MEM40I3
Tels
2502320
Tr12
2802320
022
1555
TrIÔ
29C2320
PHONO MOTOR]
JCOQ048
ME-S38É
Tri
258649
(MAIN BOARD)
F.6.B504RD
16
NIMASESDorNINZ558D-0
{PW BORD
PHONO MOTOR
|}
FÜSE 804RH
[FUSE GORD
i" U.S.A. AND CANADIAN MODELS
BRITISH MODEL
GASZR4
7
Fl
RE C4
OZ KO:
NOTÉ
SHORIH EVAGPE AN
MODEL
AIGAB273
1 GA62Z79
| AANSTRALIAN MODEL
SINCE 1887 YA! A
NIPPON GAKKI CO., LTD. HAMAMATSU, JAPAN
Printed in Japan —J © 8002
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