Sony PS-2250 User manual

General
Speeds:
Turntable drive:
Wow and flutter:
(weighted)
Signal-to-noise ratio:
(weighted)
Motor:
Turntable platter:
Start-up-time:
rower consumption:
Power requirements:
Dimensions:
PS-2250
TTS-2250
SPECIFICATIONS
33-/3, 45 rpm +4 %, adjustable
Direct drive system
Less than 0.07 % (DIN 45507)
Less than 0.04 % (WRMS)
Greater than 58 dB (JIS)
Greater than 67 dB (DIN 45544)
AC servo-controfied motor
310 mm (12-/16") dia, 1.5 kg
(3 Ib 5 oz) diecasted aluminium
Less than 2.5 seconds
15 watts
110, 127, 220 and 240 V ac,
50/60 Hz
490 mm (width) x 185 mm
“(height) x 395 mm (depth)
19-7/39"" (width) x 77/32"
(height) x 15-1 4/32" (depth)
328 mm (width) x 146 mm
(height) x 357 mm (depth)
12-2°/39"" (width) x 5-3/4”
(height) x 14-1/; 6” (depth)
Net weight:
Shipping weight:
Tonearm (PUA-114)
Type:
Arm length:
(Pivot-To-Stylus)
Over hang:
Stylus force adjustment
range:
Anti-skating force
compensation range:
Tonearm height
precise adjustment range:
Cartridge weight range:
Shelf-head weight:
11.3 kg (24 Ib 15 oz), PS-2250
7.5 kg (16 ib 9 oz), TTS-2250
14 kg (30 Ib 14 02), PS-2250
10 kg (22 Ib), TTS-2250
Static balanced
245 mm (9-7"/32"")
9,
14mm (/16 )
0 to 3g. 0.1 g increments
0 to 3g. 0.5 g increments
4.65 cm ~ 5.15 cm
(1-° 7/32") ~(2-Y/32")
4gtoilg
CW-50 (optional counterweight)
10g~17g
10.59
~
SERVICE
MANUAL

TABLE OF CONTENTS
Section Title Page
1. TECHNICAL DESCRIPTION
“4-1. Technical Specifications 2... ee ee ee 1
1-2. Principle of ac Servo System... 2... ee ee eee 1
1-3. Block Diagram «ww ee ee 4
2. DISASSEMBLY AND REPLACEMENT
2-1. Top Cover Removal ...........6. rid aia Hee TOA: ee a) Ae CO a 5
2-2. Bottom Plate Removal .. 2. 1. 1. et 5
2-3. Turntable Base Removal ... 2... 1. ee ee ee ts 5
2-4. Servo Amplifier Chassis Removal... 2... 1 eee ee ee eee 6
2-5. Servo Amplifier Cover Removal . 2... 2... eee ee es 6
2-6. Power Supply Chassis Removal .... 2.2... ee ee eee eee 6
2-7. Motor Replacement .. 1... 6. ee ee ee ee 6
2-8.
Microswitch
Replacement
......
2.2...
ee
ee
erase
eatin
ven
a
7
2-9. Strobe Lamp Replacement... 1... ee ee ee ee ee 8
2-10. Power Transistor Replacement... 1... ee ee et ee eee ee 8
2-11. Tonearm Assembly Removal... 0... eee ee 8
2-12. Tonearm Base Removal .. 1... 1. 1 eee ee et ee ee eee 8
2-13. Tonearm Lifter Replacement... 2... ee eee ee ee ee ee 9
2-14, Bias Cord Stringing... 2.0. 2 ee ee eee iesleet Stet 9
3. ADJUSTMENT PROCEDURES
3-1. Speed Adjustment 2.2... 1 es 10
3-2. Tonearm Height Adjustment... 2... ee eee ee ee es 10
3-3. Stylus-Force and Anti-Skating Force Adjustment ..........-. 10
3-4.
Lateral
Balance
Adjustment
..
2... 2...
ee
ee
ee
ee
ee
11
3-5. Lubrication 2... 0. 1 ee ee ee ee ee ee es 11
4. DIAGRAMS
4-1. Wiring/Mounting Diagram - AEP Model— .........--.-.4--. 13
4-2. Wiring/Mounting Diagram — EP Model— ...... 2.2.22 ee eee 15
4-3. Schematic Diagram .. 2... 1. ee ee 17
4-4. Mounting Diagram .. 1 2. 1 ee ee ee 19
5,
-
EXPLODED
VIEWS
203s.
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6.
REPAGKING:
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24
7.
ELECTRICAL
PARTS
LIST
......-...
2.02252
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26

SECTION 1
TECHNICAL DESCRIPTION
1-1. TECHNICAL SPECIFICATIONS
Technical specifications for PS-2250/TTS-2250
are listed in TABLE 1.
Note: TTS-2250 is a turntable unit only.
TABLE 1. TECHNICAL SPECIFICATIONS
Speeds:
Turntable drive:
Wow and flutter:
(weighted)
Signal-to-noise
ratio:
(weighted)
Motor:
Turntable platter:
Start-up-time:
Power
consumption:
Power
requirements:
Dimensions:
PS-2250
TTS-2250
Net weight:
Shipping weight: .
General
33-1/3, 45 rpm +4 %, adjustable
Direct drive system
Less than 0.07 % (DIN 45507)
Less than 0.04 % (WRMS)
Greater than 58 dB (JIS)
Greater than 67 dB (DIN 45544)
AC servo-controlled motor
310 mm (12-3/16') dia, 1.5 kg
(3 lb 5 oz) diecasted aluminium
Less than 2.5 seconds
15 watts
110, 127, 220 and 240 V ac,
(GEP Model) 50/60 Hz
100, 120, 220 and 240 V ac,
(General Export Model) 50/60 Hz
490 mm (width) x 185 mm
(height) x 395 mm (depth)
19-9/32" (width) x 7-9/32”
(height) x 15-11/32” (depth)
328 mm (width) x 146 mm
(height) x 357 mm (depth)
12-29/32" (width) x 5-3/4"
(height) x 14-1/16 (depth)
11.3 kg (24 lb 15 oz), PS-2250
7.5 kg (16 lb 9 oz), TTS-2250
14 kg (30 lb 14 02), PS-2250
10 kg (22 Ib), TTS-2250
Tonearm (PUA-114)
Type:
Arm length:
(Pivot-To-Stylus)
Over hang:
Static balanced
245 mm (9-21/32")
14 mm (9/16')
Stylus force
adjustment range: Oto 3g. 0.1 g increments
Anti-skating force
compensation
range: Oto3g. 0.5 g increments
Tonearm height
precise adjustment
range: 4.65cm ~ 5.15 cm
(1-27/32") ~ (2-1/32")
Cartridge weight
range: 4gtollg
CW-50 (optional counterweight)
10g ~17¢g
Shell-head weight: 10.5 g
1-2. PRINCIPLE OF AC SERVO SYSTEM
Fig. 1-1 shows a simplified diagram of the ac
servo system employed in this set. Since the ac motor
speed is proportional to the applied ac voltage,
it is controlled by varying the applied voltage (Em) to
the motor. This is effectively performed by means of
series resistor Rv.
In practice, series resistor Rv is replaced by the
diode-bridge circuit and collector-emitter impedance
of a power transistor as illustrated in Fig. 1-2.
Note that the diode-bridge determines only the
direction of the ac current which flows in the power
transistor.
Motor speed is converted into ac signal by
means of a direct-coupled frequency generator. The
servo amplifier compares this signal against a very
stable dc reference voltage, and then controls the
collector-emitter impedance of power transistor. Any
error.in motor speed results in a correction. voltage
supplied to the motor.
SERVO AMP
Fig. 1-1. Principle of ac servo system

SERVO AMP
Fig. 1-2. Practical ac servo system
Stage/Control Function
Start Operation
When the power switch is turned on,
Q06 in the base circuit of QO7 is cutoff.
As a result, C8 in. the collector circuit
is charged through R27,R8, VR2, R10,
VRI and R9 when the 33 rpm button
is depressed. Note that VR2 and R10
is shorted during 45 rpm operation.
Q07 is forced into conduction when
C8 is charged up to some specified
voltage. As a result the following
conditions exist: :
Q09 QO10 QOlI Q3 Q4 Q5 Q6
OFF OFF ON ON ON ON ON
and a large enough ac voltage is applied
to the motor so the motor starts to
revolve rapidly.
Correct Speed Condition
Frequency
generator When the motor starts to revolve, the
frequency generator (F.G.) generates
ac voltage whose frequency is pro-
portional to the motor speed. As the
frequency generator is directly coupled
to the shaft of the drive motor, it
converts motor speed into frequency.
Differential Q1 and Q2 forma differential amplifier
amplifier which amplifies the input FG signal to
the level required for the following
Ql, Q2
limiter circuit.
Note that the output is extracted from
collector circuit of Ql] and Q2, and
then fed to the flip-flop stage through
diode limiter D1 and D2.
Stage/Control Function
Diode limiter Removes all amplitude variations from
D1, D2 the signal. Each diode conducts when
the signal across it exceeds the barrier
potential (0.6 V) in a forward biased
condition. Thus, the output signal is
limited to about 1.2 V peak-to-peak.
Flip-flop Q01 and QO02 form a flip-flop circuit
circuit which generates square output in ac-
Q01, Q02 cordance with the input trigger signal
(limiter’s output).
The flip-flop output is extracted at
collector circuit of QO2 and then fed to
the buffer amplifier stages.
Buffer/phase Q0O3, Q04 and QOS form a buffer
inverter amplifier stage. Note that Q03 and
Q03, Q04, Q05 are emitter followers but, Q04
Q05 acts as a phase inverter.
Differentiation Square wave output at the emitter
circuit circuit of QO5 is converted into spike
C7, RO12 pulses through the differentiator circuit
(formed by C7 and RO12) to trigger
the following saw-tooth wave generator
(Q06).
Saw-tooth Q06 and RC components (C8, R9,
wave VR1, R10, VR2) in the collector circuit
generator form a saw-tooth wave generator.
Q06, C8, R9, Note that the frequency of the saw-
VRI, R10 tooth wave is determined by the RC
VR2 time constants in the collector circuit.
Voltage The saw-tooth is fed to the voltage
comparator comparator formed by QO7 and QO8.
Q07, Q08 Q08 is forward biased through the
FINE control (VR3 paralleled by R12)
R11 and R28. The current flow in Q08
is controlled by the FINE control
(VR3), which. varies its base-emitter
voltage. Q07 conducts only when the
base voltage becomes higher than the
emitter voltage which is determined by
the current flow in QO8. Note that the
emitter voltage of QO8 serves as a
reference voltage.
Referring to Fig. 1-3, the comparator
operates as follows: At time T1 a saw-
tooth signal is applied to the base of
Q07.
At time T2 the voltage at the base of
Q07 is sufficient to turn on QO7
generating a negative pulse.
Note that the pulse width is determined
by saw-tooth signal waveform:

Stage/Control
Buffer/phase
inverter
Q09, Q010,
Q011
Low pass filter
/buffer
amplifier
De amplifiers
Q4, QS,
Q6
Function
Q09 and QO11 is an emitter follower
but Q010 acts as a phase inverter
providing a positive pulsating signal to
the following stages.
Buffer amplifier Q3 and an RC network
consisting of R15, C11, R16, C12, C13
R17 and C14 comprise a low-pass
filter having a sharp rolloff charac-
teristic. .
Notice that this stage acts as an
integrator, converting the input positive
pulses into a dc voltage proportional to
the input pulse width.
De output from the low-pass filter is
applied to the base of Q4. As Q4, Q5
and Q6 are directly coupled, ‘a change
in input dc voltage alters the con-
duction of Q6, controlling the voltage
applied to the motor.
_ Servo Operation
When, by any cause, the motor speed
becomes slightly faster or slower than
the specified value, the servo system
works as follows:
Referring to Fig. 1-3, assume that the
motor speed becomes faster. The FG
output signal frequency becomes
higher, resulting in a shorter interval
between pulses for triggering the saw-
tooth wave generator. The shorter
—_ 1 1 - ;
| oem |
ee
When motor speed becomes faster.
Stage/Control
Power supply
D8, D9
C17,C19
D7
Speed
selector
switch S1
normal
—— |
i —
When motor speed becomes slower.
Function
interval between trigger pulses causes
lower saw-tooth wave height, which in
turn yeilds a shorter “ON”? period for
comparator QO7. Therefore, the output
pulse width at the emitter circuit of
QO11 becomes shorter, reducing the
positive bias upon .Q4.
As a result, the collector-emitter
impedance of Q6 increases, reducing
the motor speed.
Conversely, if the motor speed becomes
slower, the collector-emitter impedance
of Q6 decreases, increasing the motor
speed.
A positive 12 volts for the system is
provided by the full-wave rectifier
consisting of D8 and D9, filter ca-
pacitors C19, C17 and zener diode D7.
Speed changeover operation is per-
formed by changing the saw-tooth wave
frequency as previously described.
Since the saw-tooth wave frequency is
determined by the RC time constant
in the collector circuit of Q06, a speed
selector switch is connected in parallel
with VR2 and R10. A smaller time
constant results in faster motor speed
and vice versa. So S1 is open when the
speed selector switch is. set to
33-1/3 rpm.
slower
FG output signal
collector of QO2
pase of Q06
collector of Q06
collector of Q07
base of Q3
base of Q6
Fig. 1-3. Waveforms on servo control circuit

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1-3.

SECTION 2
DISASSEMBLY
AND
REPLACEMENT
WARNING
Unplug the ac power cord before start-
ing any disassembly or replacement
procedures.
CAUTION
To avoid damage to the stylus while
performing the following procedures,
make sure that the stylus protecting
cover is in place.
2-1. TOP COVER REMOVAL
1. Open the top cover, and then push the upper
hinge toward the left to release the lock as
shown in Fig. 2-1.
2. Carefully lift the top cover straight up. This
frees the top cover.
Fig. 2-1: Top cover removal
2-2, BOTTOM PLATE REMOVAL
1, Flip the wooden case upside down. Place it on
a soft protective pad, and then remove the six
screws (@ PS 3 x 16) securing the bottom plate |
to the wooden case as shown in Fig. 2-2. This
frees the bottom plate.
2-3. TURNTABLE BASE REMOVAL —
Preparation
1. Remove the bottom plate as described in Pro-
cedure 2-2.
2. ~— Up to serial No. 50,550 — (AEP Model Only)
Disconnect 4-p AMPLOK connector from bot-
tom of the turntable and then remove the top
cover as described in Procedure 2-1.
— Serial No. 50,551 and later —
(AEP Model Only)
Disconnect 4-p connector from bottom of the
turntable and then remove the top cover as
described in Procedure 2-1.
Procedure
1.
_ Remove the rubber mat from the turntable, and -
- then insert your fingers into the two holes of
the turntable. with both thumbs placed on the
center spindle as shown in Fig. 2-3.
Carefully lift the turntable straight up: ; a
Remove the three screws ( @©P 5 x 16) and two
screws ( @® PS 4x 20) securing the turntable
base to the wooden.case. This frees the turn-
table base. See Fig. 2-4.
Note: The turntable base may not be easily
"ss Temovable due to the rubber washer.
inserted between the turntable base and
the wooden case. In: this case, gently
push the motor end from the bottom.
Flip. the turntable base upside down. Place a
support between the turntable base and the
service bench to keep pressure off the motor
spindle.
Fig. 2-3. Turntable removal

Fig. 2-4. Turntable base removal
2-4. SERVO AMPLIFIER CHASSIS REMOVAL
1. Remove the turntable base as described in
Procedure 2-3.
2. Remove the four screws (@ PS 4 x 6) securing
the chassis to. the turntable base as shown
in Fig. 2-5. Thisfrees the chassis.
i
@. P 3.x 6, self-tapping
servo amp cover remova
ii
Fig. 2-5. Bottom view
2-5. SERVO AMPLIFIER COVER REMOVAL
1, Remove the servo amplifier chassis as described
in Procedure 2-4.
2; Remove the two self-tapping screws(@ P 3 x 6)
securing the servo amplifier cover as shown in
Fig. 2-5, and then slide it in the direction shown
by the arrow as illustrated. This frees the cover.
chassis removal
POWER SUPPLY CHASSIS REMOVAL
Note: The power supply chassis is an angled
member on which the power trans-
former, power transistor and fuse holder
are attached.
Remove the turntable base as described in
Procedure 2-3.
Remove the two screws ( @ PS 4 x 8) and
securing the power transformer cover to the
heat sink as shown in Fig. 2-6, if necessary.
Remove the three screws (@ PS 4 x 25)
securing the chassis to the turntable base or the
bracket, as shown in Fig. 2-5. This frees the
power supply chassis.
Fig. 2-6. Power transformer cover removal
MOTOR REPLACEMENT
Remove the turntable base as described in
Procedure 2-3.
Remove the two seilf-tapping screws (@ P 4x 6)
securing the metal cover over the terminal strip
as shown in Fig. 2-5.
Unsolder the motor lead wires at the terminal
strip, and then remove the four screws
(@ PS 4 x 12) securing the motor to the turn-
table base from the top as shown in Fig. 2-7.
Install the replacement motor.

Fig. 2-7. Motor removal
CAUTION
Electromagnetic brake adjustment
(clearance between turntable and magnet
turntable
To FG coil To Motor
co LK “"
~ }
test point
ac21+2V 3
Fig. 2-9. Test point for electromagnetic
brake adjustment
2-8. MICROSWITCH REPLACEMENT
mounted on turntable base) should be
Performed, ab Zollows after replacing: the 1. Remove the turntable base as described in
PIOPOES Procedure 2-3.
1. First of all, confirm that the turntable 2. Unhook the spring pressing the microswitch
does not touch with the magnet on the holding shaft against its bracket. Carefully
turntable base (See Fig. 2-8). If it does, draw out the microswitches along with their
adjust the magnet height by replacing holding shaft as shown in Fig. 2-10.
i ACR OUS Diaks. 3. Remove the retaining rings at one side of the
Three kind of mounting plate are
available as specified in table below.
To remove the magnet and mounting
plate, apply a few drops of cement
solvent to them.
shaft, and then replace the defective micro-
switch as shown in Fig. 2-10.
To. reassemble, reverse the aforementioned
procedure.
[EP Model] 1 [AEP Model]
Description Thickness of plate (mm) | Part Number
Mounting plate, ; 1.6 4-8 08-445-02
5 magnet 1.0 4-8 08-445-11
0.5 4-8 08-445-21
2. Set the turntable for 33-1/3 rpm
operation, and then measure the voltage
applied to the motor at the 5-p termi-
nal strip as shown in Fig. 2-9. It
should be within the limits of 21 +2
volts ac. If not, readjust the clearance
between the turntable and the magnet
by replacing the mounting plate as
previously described.
SS Qe
SH
Fig. 2-10. Microswitch replacement

2-9. STROBE LAMP REPLACEMENT
1.
2.
3.
4.
Remove the turntable base as described in
Procedure 2-3.
Remove the four screws (@ PS 4 x 8)
securing the strobe unit to the turntable base.
Pull out the unit.
Unhook the retaining spring from the lamp
cover and then apply a drop of cement solvent
to the lamp. Wait a few seconds, and then push
out the defective lamp as shown in Fig. 2-11.
CAUTION
Too much cement solvent may cause
damage to the unit. Only a few drops are
required to dissolve the rubber-base ad-
hesive.
Install a new strobe lamp. Take care that the
glowing side (front) of the lamp is positioned
as shown in Fig. 2-11
Note: Apply a drop of rubber-base adhesive
to the rear side of the lamp when
installing the lamp.
glowing
side
Fig. 2-11. Strobe lamp removal
and installation
2-10. POWER TRANSISTOR REPLACEMENT
1.
2;
3.
Remove the power supply chassis as described
in Procedure 2-6.
Remove the screw (@ P 3 x 10) securing the
power transistor to the heat sink.
Cut the emitter and base leads of the defective
power transistor with a diagonal cutter.
This prevents mica-washer damage when remov-
ing the defective power transistor.
When replacing the power transistor, apply a
coating of heat-transferring grease to both
sides of the insulation mica washer.
Any excess grease squeezed out when the
‘mounting. screw is tightened should be wiped
off. with a clean cloth. This prevents it from
2-11,
2-12.
accumulating conductive dust particles that
might eventually cause a short:
TONEARM ASSEMBLY REMOVAL
Remove the shell head.
: Remove the bottom plate as described in Pro-
cedure 2-2.
Unsolder the leads from. the terminal beneath
the turntable base (See Fig. 2-12).
The lead wires are coded as follows:
White ...........0000. L-CH
BUG ic670 3 enon ans L-CH (ground)
Reds conn eines t edie R-CH
Green ...........00005 R-CH (ground)
Remove the hexagon nut securing the tonearm
base to the wooden case.
This frees the tonearm assembly.
Fig. 2-12. Lead wire connection
TONEARM BASE REMOVAL
Remove the tonearm assembly as described in
Procedure 2-11.
_ Remove the lock lever by turning it counter-
clockwise.

2-13.
The tonearm base can be removed by turning
the tonearm height adjustment ring counter-
_ clockwise while holding the base.
When reassembling the base, care should be taken
that the lock lever meets with the slot on the
tonearm shaft as shown in Fig. 2-13.
q )
Y
Fig. 2-13. Tonearm reinstallation
TONEARM LIFTER REPLACEMENT
Remove the tonearm assembly as described in
Procedure 2-11.
Remove the screw (© F 1.7 x 3) securing the
lifting tab to the top of the lifter piston as
shown in Fig. 2-14.
Loosen the screw (© F 2.6 x 8) securing the
lifter to the lifter base as shown in Fig. 2-14,
and then depress the lifter gently. This frees
the lifter.
Fig. 2-14. Tonearm lifter replacement
4, Install the replacement lifter.
5. After replacing the lifter, adjust the cueing-
height so that the clearance between the stylus
tip and the turntable becomes 7 mm (9/32) to
9 mm (23/64') when the cueing lever is set to
the “‘up”’ position.
2-14. BIAS CORD STRINGING
In case the bias cord string breaks, it must be —
replaced with a new bias cord assembly.
(Part. No. X-20850-07-0)
Tools required:
1. Thin copper wire, 0.2 mm diameter
2. . Razor blade
3% Contact cement
Procedure:
1. Remove the contact cement on the plastic ring
and anti-skate cantilever.
2. Thread the thin copper wire through the
opening of the anti-skating compensator ring
as shown in Fig. 2-15, and then hook it to one
end of the new bias cord assembly. .
3. Gently pull the copper wire. This completes
the bias-cord threading.
4. Hook the doubled end of the cord to the tab
on: the anti-skating compensator ring and the
anti-skate cantilever, and then apply a drop of
contact cement to it.
copper wire (0.2 mm dia.)
Fig. 2-15. Bias cord stringing

SECTION 3 |
ADJUSTMENT PROCEDURES
3-1. SPEED ADJUSTMENT
Note: Correct operating speed should be ob-
tained when the front-panel speed control
_is at or near the midrange setting. If not,
readjustment is needed.
Procedure:
1. Set the fine speed control to mid position.
2: Place the turntable in the horizontal position.
3. Set the 33/45 control to the 45 position, and
then turn adjustable resistor VR1 (See Fig. 3-1)
to obtain the correct strobe indication. Fig. 3-2. Tonearm height adjustment
4. After completing the 45 rpm adjustment,
proceed to the 33 rpm adjustment as previous-
ly described, except turning adjustable resistor
VR2 (See Fig. 3-1). :
3-3. STYLUS-FORCE AND ANTI-SKATING
FORCE ADJUSTMENT
1.. Set the anti-skating compensator to its “0”
position.
2. Release the tonearm from its arm rest.
Make sure the tonearm floats freely.
3. Set the stylus force gauge to its ‘‘0” position.
4. Horizontally balance the tonearm by sliding
the counter weight at the rear of the tonearm.
Notice that the vernier weight is provided for
precise adjustment. See Fig. 3-3.
5. Turn the stylus-force knob to obtain the proper
(recommended) value of stylus force.
6. Set the anti-skating compensator to match
the value set in Step 5.
Fig. 3-1. Speed adjustment
. counterweight
3-2. TONEARM HEIGHT ADJUSTMENT [er weight
1. Release the locking lever at the tonearm base
by turning it counterclockwise as shown in
Fig. 3-2.
2. Tonearm height can be adjusted by turning the
tonearm height adjustment ring on the tonearm
base as shown in Fig. 3-2.
Fig. 3-3. Tonearm balance adjustment

3-4. LATERAL BALANCE ADJUSTMENT
1.
Set
the
anti-skating
compensator
to
its
“0”
position.
2:
Release
the
tonearm
from
its
arm
rest,
and
then
horizontally balance the tonearm.
3. Slowly lift the rear side of cabinet approximately
40 mm and observe the movement of the tone-
arm.
4. Slide the lateral balance weight towards the
same direction as the tonearm movement until
lateral balance is obtained. (See Fig. 3-4).
Fig. 3-4. Lateral balance adjustment
= (t=
3-5. LUBRICATION
Lubricate the turntable shaft once a year.
Use the SONY OL-2K oil supplied.
Remove the top of the turntable shaft by
turning it counterclockwise, and then apply two or
three drops of oil to the opening of the shaft as
shown in Fig. 3-5. ,
Fig.. 3-5. Lubrication

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bees
e
neces
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asses
Deseeenns
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eran
eerascasesseasasnassrasennsanascnnerastress
tees

SECTION 4
DIAGRAMS
1OmS (50Hz)
[_B.Ansi soral_|
PS-2250 PS-2250
TTS-2250 TTS-2250
12,3mS(33%4rpm)
9,1mS (45rpm)
4-1. WIRING/MOUNTING DIAGRAM
— [AEP Model] — easyee 180Vp-
—
Conductor
Side
—
‘
NORMAL STARTING
WHT/ BRN
la
a
cae
( BLK mt
VLT |) VLT GRNI| BLK)
BLK
at Hi Ze
AC MOTOR —_~ Pe os ar
12-P_ AMPLOK
(PLUG)
WHT ae
12-P
AMPLOK
4
GRY 12,3m$ (33 4rpm)
RED (CONNECTOR) a) 9,imS (45rpm)
~ ~T | 7.13V
NORMAL—=-STARTING
tensa 9,1mS(45rpm)
0.63Vp-p
ara
[sco J
La
| BLU/WHT
a
WHT/ BLU
a6
2SC806A
VOLTAGE
[oo _JSELECTOR
WHT.
5 IWHT/ BLU
3-P FUSE
HOLDER F2 125mA
GRY J
12.3mS(334rpm), 9,1mS A Py
t
i ee]
12.3ms (33¥4rpm)
woe STARTING
0,53Vp-p
-s
12,3mS(33Y3rpm)
i nite
(SPEED SELECTOR)
MICROSWITCH $1
= GRN|
R2
12,3mS(33%rpm)
9 Wasp)
9 pease
SPEED CONTROL
VR3 5K-B
YEL
ORG
12.3mS(334rpm)
9,1mS(45rpm) A
2
aa
SV 2.5V
2
NORMAL—~— STARTING
WHT/ BRN
10mS (SOHz)
8.3mS(60Hz)
Q. 5Vp~p
ov
J
4-P AMPLOK
(CONNECTOR)
4-P AMPLOK
(PLUG)
De en 2
UP to Seria 1 No 50,550
Note:
All
resistance
values
are
in
ohms.
k
=
1000,
There
are
two
wiring
diagrams
due
to
lead
wire
color
M
=
1000
k
and
strobo
lamp
connection
changes
as
shown
in
4-1,
All
capacitance
values
are
in
UF
except
as
indi-
and
4-2.
cated
with
p,
which
means
HUF.
All
voltages
represent
an
average
value
and
should
hold
within
+20
%.
All
voltages
are
dc
measured
with
a
VOM
(DC
20
k
ohms/V)
at
no
signal.
1
X33 13 or 45 rpm operation.
—~13-—
4-P CONNECTOR
4-P CONNEC TON
—14—
Seria1_No 50,551 and_later
AC
INPUT
NORMAL ‘- STARTING

Ey y ¥-1 8)
PS-2250
TTS-2250 TTS-2250
4-2. WIRING/MOUNTING DIAGRAM
— [EP Model] —
— Conductor Side —
sanst6on_|
18OVp-p LN /
NORMAL—— STARTING
AC MOTOR
WHT/BRN \(— ——f 3,
rier SE
os i
12-P AMPLOK
(CONNECTOR) gaze s
-
‘GRY
POWER TRANSFORMER 1 YEL
oey
(SS
2
CI
ORG
e 2 ie zy
28C806A 43k UW) 4
POWER SW, $2
STROBE Q)
LAMP
AC
SELECTOR INPUT
WHT.
GRY
—~15—
| 12,3mS(33%4rpm)
| 9.1mS(45rpm)
foes
f cio 13V
NORMAL—-STARTING
epee Pimoeee
12,3mS(3344rpm)
9,1mS ( 45rpm)
12.3mS(334 rpm), 9,1mS (45rpm)
) 53Vp-p
(SPEED SELECTOR)
MICROSWITCH S14
'2,3mS(33Ysrpm)
9,1mS(45rpm) A
12.3mS(33%4rpm)
9.1mS(45rpm)
NORMAL—~ STARTING
| WHT? BLU
_|L_WHT/BRN .
fart f 10mS (50Hz)
8. fhe
ov
NORMAL = STARTING
15 \
TFG 1 F06mS 12.3mS(33rpm)
9. 1mS(45rpm)
WHT! YEL {RED
lov 1,.8V 7
7 BV .V pu 0
OW 12.3mS (33!%3rpm)
NORMAL STARTING 9 peiaeipm) Wy.
abv
SPEED CONTROL
VR3 5K-B
=
—
:
ORG
_
Note:
All resistance values are in ohms. k = 1000,
M = 1000 k
All. capacitance values are in MF except as indi-
cated with p, which means MUF.
All voltages represent an average value and should
‘hold within +20 %.
All voltages are dc measured with a VOM (DC
20 k ohms/V) at no signal.
1
* 33 /3 or 45 rpm operation.
—~16—

PS-2250
PS-2250
TTS-2250 TTS-2250
4-3. SCHEMATIC DIAGRAM
Ql 2SC633A = Q2_- 2SC633A
47/16
iv
_ _ _ X1_CX- 0328
al RS
oa
=
Be
aif2sv
eF
ss
te of ye
C3 2.2V
1 33/16V BS ate eee ae.
c4
R2 R4 R?
10k 24k 10k
DI,D2 100-05
Note:
All resistance values are in ohms. k 1000,
1000 k
All capacitance values are in UF except as indi-
Waveforms cated with p, which means MF.
All voltages represent an average value and should
hold within +20 %.
All voltages are dc measured with a VOM (DC
20 k ohms/V) at no signal.
NORMAL
12.3mS 3311/3 rpm (45 rpm. 9.1 mS)
oe el ee
0.45 V
ADA
.3 Vp-
93 ‘pp
Waveforms are measured by using an oscilloscope.
1
33 /, or 45 rpm operation.
re5 0 Toss Vp-p ‘
oS NORMAL STARTING
4
12.3mS_ 331/3rpm (45 rpm. 9.1 mS)
a
1
Tr, fa ae NO Ot
@>o 10.63 vo rG) LA Ay 125¥ 25V
0 a Nt
4
yO2V
T ener eens mena) oan tenes
80V ory,
Qo Qt
tah T-4
: ———---—
ae i 7.6V
18V *O7V
Go
tet
@o
ane
1
a
O9V —_—=: t= 0.6mS
: T T 100
=
O
Sl; SPEED SELECTOR
sw
D3,D4 10D-05 D5 !1T243M47
foo 188
aaa a eas | 180
9.0V
D3
C10
33
16V
D5 RIS | RIG RI7
36k 4 36k 3.6k
cl2
ci3
33/IOV, Sho
Lic
ieov
ci4
Ru isjiev
fea RI3. 24k a
RI2 180
D7 zBI-I2
D8 cD-2 ins
D9 CDR-2 ‘ev
se ay 7 START
ae lO5V)
Ik
(SW)
ci8
10/350V
Q6 2SCB806A DIO CD-4
NORMAL
STARTING
fe
|
12.3:mS
331/3
rpm
(45
rpm
:
9.1
mS)
Se
AT
@>
09V,16V
aM
AES Ve a
50
Hz
(60
Hz
:
8.3
mS)
7
10ms
POAT
80.5 Vp-p
@.
{ 180 Vp-p
0
62.1
Vpp
= 43 =—
Q3,04 2SC633A
D6 10D-05 Q5 2SA677
R22 R23
18k 560
{L6V
06
(Lav
8
yy) 05
NUS
IL8V : O.56V
ev lie
K) a3
Us
C15
o47/lov XK) 04
0.6'
R20
120k Ral
(2k
RIO Ccl6
ik es
AEP_ Model
LAMP
R25_4,3k (tW)
$3; POWER SW
VOLTAGE
SELECTOR
AC
INPUT. {
CONNECTOR F
EP Model *
R25 4.3k (1W)
Dil CDR-4 STROBO © VOLTAGE
: LAMPS SELECTOR
i FI 2 i
To
D8
oe
To D9
To DIO
1
Te C20 —¢
Co ed
CP(0,033y+1200)

4-4. MOUNTING DIAGRAM
— Component Side —
2SC633A
—~19—
2SC806A
CD-2, CD-4
CDR-2, CDR-4
2B1-12
1T-243M47
10D-05
CX-032B
anode cathode
PS-2250 PS-2250
‘TTS-2250 TTS-2250
14
13
12
11
10
top view
=A TOON
SECTION 5
EXPLODED VIEWS
(1) The following chart will help you to decipher the hardware codes given in the exploded views.
—— Hardware Nomenclature
Pan Head Screw
Pan Head Screw
with Spring Washer
Flat Countersunk Head Screw...
Binding Head Screw
Oval Countersunk Head Screw ..
Truss Head Screw
Round Head Screw
Flat Fillister Head Screw
SC — Set Screw
E — Retaining Ring (E Washer)
— Example —
Type of Slot
@ P 3x10
| L_ Length in mm (L)
Diameter in mm (D)
— Washer
— Spring Washer
— Lock Washer
-— Nut
Type of Head
Te
L L
Dea Es)
40K
rt
“Dk
(2). To simplify the exploded view, the part numbers of normal screws, nuts, washers, and retain-
ing rings are not expressed but summarized in the table below.
Part No.
7-621-255-25
7-621-255-62
7-621-259-58
7-621-303-22
7-621-305-42
7-621-659-18
7-621-712-27
7-621-843-47
7-621-843-68
7-621-844-28
7-622-105-02
7-622-307-01
7-6 23-108-17
7-623-110-11
7-623-208-12
7-6 23-408-01
7-623-508-11
7-624-101-01
7-624-105-01
7-626-301-01
7-671-102-01
7-671-112-01
7-682-146-03
HARDWARES
Description Part No.
@ P2x4 screw 7-682-149-13
@ P2x10 — screw 7-682-150-13
@ P2.6x8 screw 7-682-152-01
© F1.7x3_ screw 7-682-153-05
© F2x6 © screw 7-682-178-01
@® RK 2.6 x 3 screw 7-682-254-15
© 26x3 screw, set 7-682-46 1-13
@® R3.1 x 16 screw, wood 7-682-647-01
@® R3.1x 25 screw, wood - 7-682-660-01
@® R3.1x8 screw, wood 7-682-661-01
2 mm dia. nut 7-682-663-01
2.6mm dia. nut 7-682-667-01
3 mm dia. washer (middle) 7-683-128-03
4 mm dia. washer (middle) 7-683-145-00
3 mm dia. washer, spring 7-684-023-00
3 mm dia. lock washer, external tooth » 7-685-102-21
3 mm dia. lug 7-685-144-01
1:2 mm dia. retaining ring 7-685-145-01
2.3 mm dia. retaining ring 7-685-146-01
1.6x6 pin 7-685-148-01
1.6 mm dia. _ steel ball 7-685-158-01
2 mm dia. steel ball 7-685-159-01
@® P3x5 screw
—20-—
Description
@P3x10 © screw
@ P3x12- screw
@® P3x16 — screw
@® P3x20_— screw
@ P5x16_— screw
@ K3x25_ screw
@ T4x8 screw
@ PS3x6_— screw
@ PS4x6 © screw
@© PS4x8 screw
@® PS4x12 > screw
@ PS4x25° screw
© 2x5 screw, set
© 4x4 screw, set
3 mm dia. nut
@ P2x4 screw, self-tapping
@® P3x5 screw, self-tapping
@® P3x6 screw, self-tapping
@® P3x8 screw, self-tapping
@ P3x12 © screw, self-tapping
@ P4x6 screw, self-tapping
@ P4x8 screw, self-tapping

(1)
1-534-560-12
connection
cord,
with
phono
Plugs
4-808-452
Spacer, turntable base
wood screw
®R3.1x 16
4-807-702
hinge, wooden case
wood screw,
@K31x 13
1-509-445-11
ac input connector
1-508-461-7171
amplok, 4-p (plug)
©3.2
4-808-505
holder, rubber cushion
© 33 4.817.703
cushion, rubber
OFF
4808-503
foot, rubber
self-tapping screw,
3x 712
eS?
4801-533
emblem, SONY: top cover
4-817-721°
spacer, hinge
4-814-133
hinge, top cover
emblem, STEREO
Ss
td
4817-723
X-48085-04-0
cushion,
top
cover
top
cover
ass’y-
7
3
} 4.801-319
4-808-434
mat, turntable
2-085-054
plate, base
4-808-551 i
label, specification
'2-027-510
Spacer
®I~3 -
X-48085-11-1
case ass’y, wooden
washer, 3 mm dia.‘
4-807-117
nut, Carriage
wooden screw
RBIXIE— «
i —«
'&
®
Cy X-48085-13-1
bottom board ass’y A
4-807-138
indicating label, speed control
—21-
2-085-074
‘ base, rest
i
3-701-185-11
Note:
al~3
top
cover
ass’y
(X-48085-04-1)
includes
all
the
parts
marked
e1~3
wooden
case
ass’y
(X-48085-11-1)
includes
all
the
parts
marked
®
&31~33
pottom
board
ass'y
(X-48085-13-
1)
includes
all
the
parts
marked
®
4-808-919
]
clamp (A), connection cord
Bm Ps3x6 +2 | |
4-808-513
_ clamp (B), connection cord
——~2.086-060
tone-arm rest
4-808-035
8 washer, rest
washer, 5mm dia,
_-—-—
washer,
spring;
5
mm
dia.
¥
——nut,
§
mm
dia.
22
4-808-541
4-808-914
_ base plate, tonearm
1-536-182
terminal strip, 2L2 (C)
4808-916
cover, shield
i
“~~ © PS 3x 6
— 3-401-482
washer, 3 mm dia,
“OP 3x 16

(2)
EP Model
3 4-808-475-00 1
bracket, terminal strip :
4-807-221-00
strain relief, power cord
7-624-194-00
stopper
Note: . ; , B3x6-% 5
3-001-707-03- a p 9, 3mm dia
*1~12 push button ass’y (X-48084-01-1}
clamp, power cord
includes all the parts marked {EP Madel} wee
cover, terminal strip
@® PSW3x 6 ¥
x Be
*{~123 push button ass’y (X-48084-12-1) OES 34 8e ~. ®B3x6
includes all the parts marked (AEP Model) 1-536-213- 1x
4-808-432-11 @® PS 4x 12 terminal strip, D-5p
escutcheon, front Ns
Zee
d & Se. PSW3x6
8-836-624-10 Pe oe
motor, UC-624P bracket, terminal strip
1-836-268-12
4-808-463
terminal
strip,
D-6p
s!
cushion,
front
escutcheon
te
AEP
Model
i!
:
4-808-475-00
‘
i
Ba
4-808-440
>
bracket,
terminal
strip
p
to
Serial
No:
escutcheon,
strobe
@©
PS
4x
8B
4-814.
shew
C...|
Serial
No.
5@,5,
-
cover,
terminal
strip
©
insulator,
4-p
amptok
i
X-48084-08-1
1-452-059
qetifeane
annoy,
1-508-461-31
strobe
unit
magnet
®
PSW3
x
6,
|
|
acl
amplok,
4-p
(socket)
@ps4xe
x
-02
gr:
1-519-058-21
>
i
Ee
By
4
,
taping
i
lamp,
stobo
Te
4-808-446
“}
spacer,
magne;
washer,
3mm
dia;
|«
@P
3-401-482-00
-808-
¢
9X12
!
fem,
SONY
ht
@B3x
woe
SB
washer
4
tad
emblem
a
Moa.
bs
i
Can
3.001-707-10
es
‘ :
sae
4
i
band,
4-p
connecto
4808-443
a
©
PSW
3
x
et
Geek
1-506-197-11
Beam
.
f
lug,
4-;
spring,
strobe
lamp
securini
1-536-316-17
plug,
4p
slits
R
9
ry
terminal
strip,
D-5p
Ne
ah
~
Eades
4-808-475-00
Sg/ock
washer,
socket,
4-p
@PS4x8
bracket,
terminal
strip
6
ee
boas
®
PSW3
x
10
*
1
4-808-431
1-536-289-11
.
Washer,
3mm
dia
4808-406
motor
board.
terminal
strio,
LALA
|
‘WA8n8r
push-button,
POWER
switch
se
1-509-434-22
«2
ee
amplok,
12.p
(socket)
sB084-02
2
:
a3
if
Fi
1-508-451-31
lever
ass’y,
shut-off
|
4-808-408
OPane
screw,
Sod
eae
amplok,
12-p
(plug)
{AEP
Model)
‘
“FOUOF-US~
ae
1-508-461-51
:
‘|
|
chassis
ass‘y
(A),
servo
amplifier
amplok,
12-p
(plug)
(EP
Model}
*4
-
4808-457
he
,
4-808-407
j
bracket,
12-p
amplok
suppor
;
push
button,
33
7pm.
;
oon
.
he
4
self-tapping
screw,
‘
“6
R
LES
had
nN
Ce
Sei
aston
=e
||
nk
tA
OR
ig
—_,
1-117-088
ee
|
:
snounted
circuit
board,
Servo
amplifier
capacitor,
MP
4
uF/250
V
X-48084-04
0
a:
ie
lever
(B)
ass’y,
speed
selector
Gx
var
é
@ps4x
6-7
| ;
Z,
.
ip
errr
OP
3x
4
Ie
g3)
|
~~.
|!
resistor,
wire
wound
1
kQ/5
W
*9
4808-40:
on
X-20545-12:1
FI
SA
spring
¥
2
»
«
knob
ass‘y,
fine
sp
f
retaining
ring,
2.3
mm
dia
}!
:
1
a7: @® PS 4x 6 7
X-48084-03 q
lever (A) ass’y, speed selector
* 104-808-410
spring, micro-switch
#13 1-614-423-11
’ switch, micro
7-623-156-90 (AEP ‘Model only) +11
tube, viny! KS 4808-411
cover, shield #
4-808-426 4-808-450
lug,
lead
wire
~~
—~~*®
bracket,
chassis
support
}
9,
‘
@Ps4x6
capacitor, electrolytic 16 uF /100 V
lock washer, 3 mm dia.
{external tooth)
“|g 1-514-423-11|@&®
switch, micro + self-tapping screw,
4 @OP3x6
4-808-435 .
chassis {B), servo amplifier
a 4-807-1:38-03
self-tapping screw, indicating label, speed control adj.
P3x6
-533-026-31
Se
Woldee,
3p
4-808-444-02
4-808-449
.
bracket,
fine
speed
contro!
support
699-449-11
seit
tapping
screw,
1-221-727
® Psw i
fuse, 125 mA 3x6 fine speed control, 5 kQ (B)
(AEP Model Only)
1-532-074-17
fuse, 200 mA
4-808-458-21
insulator, rubber
1-536-182
terminal strip; >
L4L (A)
4-808-463 ;
collar, power supply chassis
@PS4x8 4803-161 .
cushion, power supply chassis
4-808-472 2027-510
cover, power transformer
@PS4x8 X-48084-07
chassis ass‘y, po’
1-509-385 hee ce
voltage changeover block ‘ transformer, power
@PS3x8 _ 4.805-037-11
cover, voltage selector
washer, power supply chassis
4816-534
screw (8), voltage
selector cover securing
4-8 16-533
screw
{A},
voltage
selector
mate,
22
ai
cover
securing