Technics SLBD 20 Service Manual

Page 1

OR DER NO. HA0860235600

ervice Manual

DC Servo Automatic
Turntable System

Color

(S) ..... Silver Type
(K) Black Type

is the standard mark for plug-in»connector system. Products
carrying this mark are interchangeable and compatiblewith each other.

SPECIFICATIONS

I TURNTABLE SECTION

Type:
Featu res:

Drive method:

Motor:

Drive control method:
Turntable platter:

Turntable speeds:
Wow and llutter:

Rumble:

Automatic turntable
Auto-return

Auto-stop

Belt drive

DC motor

DC servo control
Aluminum die-cast
Diameter 31.2 cm (12-9/32")
33-1/3 rpm and 45 rpm
0.045% WRMS (JIS 05521)
143.06% Weighted zero to peak
(IEC 98A weighted)

-70 dB DIN-B (IEO 98A weighted)

l TONEARM SECTION

Type:

Overhang:
Ellective length:

Technics

Static-balanced straight tonearm
PIug-in-connector cartridge
system

15 mm (19/32")

230 mm (9-1/16")

Matsusmta services Company
50 Meadowland Parkway,
Secaucus. New Jersey 07094

Turntable System

SL-BD20

Color Areas

(S) (K) [M] U.S.A.
(S) (K) [MC]
(S) (K) [E] ..... Switzerland and

Scandinavia.
(S) (K) [EK].... United Kingdom.
(S) (K) [XL] Australia.
(S) (K) [EG] F.Ft. Germany.
(S) (K) [EB].,.. Belgium.
(8 (K) [EH].... Holland.
(8 (K) [EF]. . France,
(S (K) [Ei].. .ltaly.
(S (K) [EC].... Czechoslovakia.
(S) (K) [XA] Southeast Asia,

Canada.

Oceania, Africa,
Middle Near East
and Central South
America.

Tracklng error angle:

Eltective mass:

Stylus pressure:

Applicable cartridge
weight:

Phono cable
capacltance:

Within 2°32 at outer groove of
30 cm (12) disc within 0°32 at
inner groove of 30 cm (12") disc
13.5 9 (including cartridge)

1.25 9 (Fixed)

69

90pF

CARTRIDGE SECTION (Except lor U.S.A. and

Canada.)

Type:
Frequency response:
Output voltage:

Channel separation:
Channel balance:

P.O Box 774

Panasonlt HIWIII, Inc.
91-238. Kauhi St. Ewa Beach

Moving magnet stereo cartridge
10 Hz ~ 30 kHz

25 mV at 1 kHz. 5 cm/s. zero to
peak lateral velocity

22 dB at 1 kHz

Within 2 dB at 1 kHz

Matsushita Electllc Tvadlng 00., Ltd.
P O, Box 238, Central Osaka Japan

Honolulu, Hawaii 96808-0774

Panasonic Sales Company.
Dlvlslon o! Mnlsushila Electric
at Pueno Rico. Inc.

Ave. 65 De lntanteria, KM 9.7
Victoria Industrial Park

Carolina. Puerto Rico 00630

Malsuslllta EIBCIVIC

01 Clnldl Limited

5770 Ambler Drive. Mississauga,
Ontano. L4W 2T3

Page 2

Recommended load Power consumption For (M), (MC) area 2.5W
Impedance: 47 km ~ 100 k0 For (XA) area 2W
Compliance (dynamic): 12><10'6 cm/dyne at 100 Hz For Others: 1.5W
Stylus pressure range: 1251:0259 (12.5:2.5mN)
Welght 6 g (cartridge only) Dimensions
Replacement slylus EPS-24CS (WXHXD) 430x93><375 mm
(16-15/16"><3-21/32"><14-3/4)
When dust cover is open:
I GENERAL 430x360><410 mm
Power supply: For U.S.A. and Canada: (16.15/16vv><14_5/32n><16_1/3l-)
AC 120V, 60 Hz Welght 3.6 kg (7.9 lb.)

For United Kingdom and Australia:
AC 240V, 50 HZ

For Continental Europe; Specifications are subject to change without notice for further
AC 220V, 50 Hz improvement.
For Others: Weight and dimensions shown are approximate.

AC 110N127/220~240V, 50/60 Hz

I CONTENTS

Pa e
SAFETY PRECAUTION ...... 2 CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM 98
LOCATION OF CONTROLS .. .. 3 TROUBLESHOOTING ................................... 9
DISASSEMBLV INSTRUCTIONS. . .3 N 5 EXPLODED VIEW ................................... 10 ~ 12
MEASUREMENTS AND ADJUSTMENTS 6 REPLACEMENT PARTS LIST 12, 13
SCHEMATIC DIAGRAM ................ 7 PACKING ........................................

- SAFETY P R E CAUTI o N (This safety precaution is applied only in U.S.A.)

. Before servicing, unplug the power cord to prevent an electric shock.

. When replacing parts, use only manufacturers recommended components for safety.

. Check the condition of the power cord. Replace if wear or damage is evident.

. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc,

. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to
prevent the customer from being exposed to a shock hazard.

015de

o INSULATION RESISTANCE TEST
. Unplug the power cord and short the two prongs of the plug with a jumper wire.

12, Turn on the power switch,

3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads, antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3M9
and 5.2MSZ to all exposed parts. (Fig, A) Equipment without antenna terminals should read approximately infinity to
all exposed parts (Fig. Bl

Note: Someexposed parts may be isolated from the chassis by design. These will read infinity.

Anten na
termlnal

Exposed Exposed
metal metal
part pan
Ohmmeter Onmmeter
(FigAl (Fig.8)
Resistance = 3M9-5.2 MQ Resistance = Approx 00

4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be
repaired and rechecked before it is returned to the customer.

_2_