Technics SL-1200MK2 Service Manual

FEATURES
Total quartz locked continuous pitch
adjustment
f8%
Quartz-phase-locked control means almost perfect accuracy
of turntable rotation .
But with most quartz turntables, this accurate control
circuit must be cut out when the pitch control is employed .
With the SL-1200MK2, however, pitch is variable con-
tinuously (analogically) by
up
to ±8% under total
quartz-
locked control .
The
pitch is
controlled
with a
large sliding
lever, located
to the
right of
the
turntable
platter
.
Four lines
of
platter markings are
also
provided indicating
+6%, +3 .3%,
0% (exact rated speed)
and
-3 .3%
change
from
rated
speed .
Aluminum diecast cabinet and special heavy rubber
base
material provide acoustic isolation
The effects of external vibrations are dramatically reduced
in the turntable by
this new
turntable construction
.
The turntable base is precision-made aluminum diecast .
And the underside of the main base is made of a heavy
rubber material (special one-piece molding) which has
excellent vibration resistance and absorbing characteristics .
The turntable platter is also vibration-damped with special-
ly fabricat rubber matting in the underside along with the
thick turntable sheet (rubber mat) . Four large-size insulating
feet also help to absorb unwanted vibrations .
These

features make SL-11 200MK2 ideal for use with extra-
high sound pressure levels .
High torque for fast starts
The integral rotor/platter motor delivers 1 .5kg-cm
(1
.3lb-in)
starting torque . This high torque gives very quick starts
enabling the platter to reach 33-1/3 rpm within 0 .7 s . (a
quarter of a turn) . This is a big advantage in many profes-
sional applications where fast cueing is a necessity .
Stylus illuminator for low-light conditions
You'll appreciate the stylus illuminator when you are using
the turntable under low-light conditions . The illuminator
can
be
hidden in the turntable base, should
you
need
it,
simply push a button and
it
will pop up gently and cast
a
beam of light across the disc in the area traversed by the
tonearm .
SL-1200MK2
You can then
clearly see the spaces between the selections
on the record,
and cue the arm exactly where you want it .
The
illuminator can then be pushed back down into the
base .
High sensitivity, low mass, gimbal
suspension
tonearm
The highly sensitive
tonearm features a genuine gimbal
suspension, the rotational center
of which is precisely
defined at one point .
Bearings are finished to a tolerance of
±0 .5
microns . This and the extra-closeness of pivot center
to the
bearings, result in the minimal friction of 7 mg
(0 .007
g) for both horizontal and vertical movement . Add
to this the low 12-gram effective tonearm mass (including
headshell, without cartridge) and you have a tonearm com-
patible with the wide range of compliances found
in today's
cartridges . If you choose a popular high compliance
MM
cartridge, the low range resonance frequency
will appear in
the correct area to avoid warp frequencies
of records, but
without entering the low end of the audio spectrum
. This
tonearm is provided with a computer designed, light-weight,
high-rigidity headshell made of single-piece diecast aluminum
to resist partial vibration . The universal design allows head-
shell interchangeability . Contacts are gold-plated .
Helicoid tonearm height adjustment
Arm height is adjustable within a range of 6 mm to accom-
modate varying cartridge dimensions . Adjustments are done
with a precision-made helicoid .
Other fine features
"
Quick stops
are achieved with a fully electronic braking
system .
" A strobe illuminator is provided . The stroboscope is con-
trolled by the extremely stable quartz oscillator, rather
than potentially unstable AC line frequency .
Power on/off control built-into strobe
illuminator for
ease-of-operation .
Soft-touch start-stop switch
allowing precision control
capability without the annoyance of accidental operation .
" Technics integral rotor/platter motor construction with
full cycle detection FG .

Technics SL-1200MK2 Specifications

General

Product color	Silver
Power requirements	AC120V, 60Hz
Signal-to-Noise Ratio (SNR)	78 dB
Power consumption (typical)	14 W

Weight and Dimensions

Depth	360 mm
Width	453 mm
Height	160 mm
Weight	12000 g