Sony ps lx 285

Page 1

SERVICE MANUAL

Photo: PS- LX285.

PS-LX285: This set is the turntable system section in SEN 280.

US Model
Canadian Model
AEP Model

UK Model

E Model

PS-LX 100

US Model
Canadian Model
E Model

Italian Model

FS-LX 285

SPECIFICATIONS

Turntable
Platter 300m (12 in.)

US model: Plastics

Others: aluminium-alloy diecast
Motor DC servo motor
Drive system Belt-drive
Speed 33 /3 rpm,45 rpm
Signal-to-noise ratio

65dB (DIN-B)

Automatic system Return, reject
Tonearm type Statically balanced
Cartridge
Type Moving magnet type
Stylus Sony ND-155G (06 mil diamond)
Dimensions US model:

Approx. 430x95x350mm Iw/h/d)
(17x37. x137, inchesl

Others model:
Approx. 430x 105x350mm Iw/h/dl
(17x4/. x137. inchesI

Weight US model:

Approx: 2.5kg (5lb 901) net

Others model:
Approx. 3.3kg I7lb 502) nEt

Power Requirement (PS-LX100 model only)
US, Canadian model: 120V AC, 60Hz
AEP model: 220V AC, 50/50Hz
UK model: 240V AC, 50/60Hz
E m0d8I2110-120 or 220-240V AC
adjustable, 50/60Hz

SA FETY-RELATED COMPONENT WARNI NGI I

COMPONENTS IDENTIFIED BY MARK & 0R DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES som- camoues POUR LA sécunrré
DE FONCTIONNEMENT. NE REMPLACER css com-
POSANTS QUE PAR DES PIECES souv DONT LES
NUMEROS son-r DONNES DANS ce MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

STEREfl TURNTABLE SYSTEM

SONY;

Page 2

PS-LX1 00/ LX285

LX285 Model only

REPEAIRING PRECAUTION

[To supply B+ voltage]

The power of this unit is fed from TA-AX285.
Because of this, connect the regulated power supply
as illustrated right when this unit alone operates.

regulated Dc
3P connector POWEr supply
3 core card
I BL K ) E]
12 I/
7 DC
0'-|0 +
ll--o _

with white stripe

MODEL IDENTIFICATION
- Specification Label -

SONY-8 MODEL NO. PS-LX100

STEREO TURNTABLE SYSTEM

SERIAL NO.

MADE IN TAIWAN 4-896-283-01

PS- LX1 00 Model only:

US, Canadian model: AC 120V 60Hz 4W

AEP model: AC 220V 50/60Hz 2W

UK model: AC240V 50/60Hz 2W

E model: AC 110 -120/220 -240V 50/60Hz 4W

PS-LX100 Model only
SAFETY CHECK-OUT (US, Canadian Model)

After correcting the original service problem,

perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to

earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods.

1.

A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers instructions to use these instru-
ments.

A battery»operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job,

3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The limit" indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are
suitable. (See Fig. A)

To Exposed Metal
Parts on Set

/ AC
voltmeter

0.15uF g 1.5m
(0.75 V}

7 Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.