Technics SL 1500 Mk2 Service Manual

Page 1

ORDER NO. 5077094 271

Service Manual

QUARIZ Synthesizer Direct
Drive Turntable System

SL-1500M K2 (M. MC)

o The model SL-lSOOMK2 (M) is available in America only.
0 The model SL-1500MK2 (MC) is available in Canada only.

SPECIFICATIONS (Specifications are subject to change without notice for lurther improvement)
General Rumble -50 dB (DIN 45539A)
Power supply AC 120 V, 50 or 60 Hz -73 dB (DIN 455398)
Power consumption 1 2 W Tonearm section
DimenSions 14b x 45.3 X 38.4 Cm Type Girnbal suspended universal "S"
(H x W x D) lb-45/64 x 17-45/64 x 157/64 shaped tubular arm, static-balanced
inches) type
Weight 1 1.8 kg (26.0 lb) Effective length 230 mm (9-1/16)
Turntable section Overhang 15 mm (lg/32")
Type Ouartz-DhaSG-IOCked €0erI direct Tracking error angle +3O at the outer groove of 30 cm
drive turntable with quartz (12) record
synthesizer pitch control, Manual +l° at the inner groove of 30 cm
play (12") recent
Drive method Dirert Drive Offset angle 215°
Motor Brushless DC motor Friction Less than 7 mg (lateral, vertical)
Drive control method Ouartz-phase-locked control Effective mass 22 g (with a cartridge weighting 6 g
I Turntable platter Aluminum diecast, diameter 33 cm at 1.25 g stylus pressure)
(13"), weight 2.5 kg (5.5 lb.) Tonearm height adjust- ln lmm steps to a range of 6 mm
Moment of inertia 340 kg-cm2 (116 lb-inz) ment
Turntable speeds 33-1/3 and 4b r.p.m. Adjustable stylus 0 ~ 3 g
Turntable speed fine Adjustable up to i9.9% in 0.1% pressure range
I adjustment increments by digital indication Cartridge weight range Sell 9
Starting torque 1.5 kgcm (1.3 lb'in) Cartridge mounting 12.7 mm (1/2") mounting space
Build-up characteristics 90° or 1/4 rotation to 33-1/3 rpm dimensions
Braking system Electronic: brake Headshell terminal lug 1.2 mm, for 4 pin terminal
Speed fluctuation due 0%) within 1.5 kg-r;m (1.3 lb-in) Headshell weight 9.5 q
to load torque
Speed drift Within 00029.!0 Weights and dimensions shown are approximate.
Wow and flutter 0.025% WRMS (JIS C5521)
20.03596 weighted zero to peak
1 (DIN 45507)
J
Panasonic Company Matsushita Electric of Hawaii, Inc. Matsushita Electric of Canada Ltd.

0
I echnlcs Division of Mat5ushita Electric 320 Waiakamilo Road, Honolulu. 40 Ronson Drive. Rexdale,
Corporation of America Hawaii 96817 Ontario, Canada MQW 185
byPanasonic One Panasonic Way. Secaucus.
New Jersey 07094

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lgl SL-1500MK2

I FEATURES

Encounter two separate isolation stages. The first stage
effectively damps out harmful external vibrations which
may reach the unit through its resting surface. The all-
important turntable, motor and tonearm assembly are
then supported on a second isolation system. These
isolators are specially designed with material and springs
of calculated, finely-tuned elasticity to absorb external
vibrations.

Isolation from feedback lets you enjoy clear, transparent
sound even at high volume levels.

Technics unique motor construction in which the rotor
of the motor is integrally formed with the turntable.

High torque motor delivering1.5kg-cm makes it possible
to reach 33-1/3 r.p.m. from standstill within 0.7 sec.
(1/4 rotation) and to effect instantaneous speed change.
(Fig. 1).

Superior load characteristic of 0 rotational deviation
even at a stylus pressure of 300 9. (Fig. 2).

High performance with wow and flutter of only 0.025%
(JIS C5521) and rumble of -73 dB (DIN 455398).
Since the development of the DD turntable, Technics
has continually strived for further improvement of
player performance and has introduced numerous high
performance models on the market.

The SL-1500MK2 series is brought into being by com-
bination of experience and research.

The characteristic values of rumble -73 dB (DIN
455398) and wow and flutter of 0.025% (W.R.M.S JIS
C5521) by far exceed the standards to which record
albums are made.

Quartz Controlled Rotation Accuracy

The SL-1500MK2 utilizes the oscillation of a quartz cry-
stal as a reference signal or source. This oscillation is not
affected by temperature change or power fluctuations.
By synchronizing the rotation of the turntable platter
accurately to the reference signal, speed drift of the SL-
1500MK2 is held within i0.002%. This means that for a
record with a playing time of 30 min, total playing time
variation can amount to no more than 0.036 sec. This
stable and accurate rotation sets a new standard of pre-
cision.

The accuracy under controlled operating conditions as in
a listening room is about 10.00001% as shown in Fig. 3.

Highly sensitive universal tonearm.

For the finest tracking sensitivity, the tonearm rests in a
gimbal suspension equipped with two pairs of low fric-
tion pivot bearings. Gimbal suspension and low tonearm
mass means that accurate tracking is possible at tracking
forces as low as 0.25 grams. With enhanced rotational
sensitivity of 7 mg. the tonearm is allowed free, gyro»
scopic movement to ensure flawless balance during
tracking. The longer-than-usual effective tonearm length
(9-1/16" or 230 mm, stylus to pivot) contributes to the
arm's low tracking error, and this in turn facilitates the
design of the anti-skating control for precise and reliable
tracking. With this design, a single precise anti-skating
scale counteracts side thrust for all types of styli.

Arm height is adjustable within a range of 6 mm to ac-
comodate varying cartridge dimensions.

Resonance dampened headshell with unique overhang
adjuster.

Low capacitance phonocables.

Load Characteristics

50

45r.p.m. I l

40-
3° 33-1/3r.p.m. +

20

Speed (r.p.m.l

10>

0 0,5 1.0 1.5
Load torque Ikg. cm)

Fig. 2

Build-up Time
50'
45 r.p.m.
40
E.
E 30 33-1/3r.p.m.
U
i
u, 20
10
+-A-
0 0.5 1.0 1.5
Til-noun.)
Fig. 1
*0.000'l%,
5 sooooosx . -
E o
5
0 .0.0000515
U)
-o.ooom . I .
0 10

20

30

Time (min)

40 50 60

Fig. 3