technics_sl1200_service_manual.pdf

ORDER NO. SD7908-1601

ServiceManual

Turntable System

SL-12

OM K2

(M), (MC)

A WARNING

This service literature is designed for experienced repair technicians

only and is not designed for use by the general public. It does not

contain warnings or cau:'.ons to advise non-technical individuals of

potential dangers in attempting to service a product . Products powered

by electricity should be serviced or repaired only by experienced

professional technicians. C.iy attempt to service or repair the product

or,,products dealt with in this service literature t;+ anyone else could

rest'' in.. serious injury or death .

" The model SL-11 200MK2 (M) is available in U .S.A . only .

*The model SL-1200MK2 (MC) is available in Canada only.

SPECIFICATIONS

Specifications subject to change without notice.

Weight and dimensions shown are approximate.

General

Power supply:

Power consumption:

Dimensions:

(WxHxD)

Weight:

Rumble:

-56 dB (I EC 98A Unweighted)

120 V,AC,50or60Hz

-78 dB (IEC 98A Weighted)

12W

45.3x 16.2 x36 cm

Tonearm section

(17-27/32"x6-19/64"x l 4-11/64")

Type:

Universal

11 kg (24.3 lb)

Effective length :

230mm (9-1/16")

Arm height adjustment

range:

31 .8-37 .8 mm (helicoid part 6 mm)

(1-21 /32"-3-35/64")

Turntable section

Type:

Quartz direct drive

(helicoid part 15/64")

Manual turntable

Overhang:

15 mm (19/32")

Drive method :

Motor:

Turntable platter:

Direct drive

Effective mass:

12 g (without cartridge)

Brushless DC motor

Offset angle :

22°

Aluminum diecast

Friction:

Less than 7 mg (lateral, vertical)

Within 2° 32' (at the outer groove of

Diameter 33.2 cm (13-5/64")

Tracking error angle:

Weight 2 kg (4.4 lb .)

30 cm (12") record

33-1/3 rpm and 45 rpm

Within 0°32' (at the inner groove of

Turntable speeds:

Pitch control :

;:carting torque :

Build-up

characteristics:

Braking system :

Speed change due to

load torque :

Wow and flutter:

All quartz-locked ±8% range

30 cm (12") record

1 .5 kg-cm (1 .3 Ib-in)

Stylus pressure

adjustment range:

0-2 .5 g

0.7 s. from standstill to 33-1/3 rpm

Applicable cartridge

6-10 g

weight range :

13.5-17 .5 g (including headshell)

Electronic brake

(with auxiliary

9 .5-13 g

0% within 1 .0 kg-cm (0.87 Ib-in)

weight) :

17-20.5 g (including headshell)

0.01% WRMS*

(with shell weight) :

3.5-6.5 g

0.025% WRMS (JIS C5521)

11-14 g (including headshell)

±0.035% peak (IEC 98A Weighted)

Headshell weight:

7 .5 g

* This rating refers to turntable assembly alone, excluding

effects of record, cartridge or tonarm, but including

platter . Measured by obtaining signal from built-in fre-

quency generator of motor assembly.

Cud Matsushita Electric Industrial Co . Ltd.

copying and distribution is a violation of law

Panasonic Hawaii, Inc .

320 Waiakamilo Road, Honolulu,

.Hawaii 96817

Matsushita Electric of Canada Ltd.

5770 Ambler Drive,

Mississauga, Ontario

LAW 2T3

Panasonic Company

Division of Matsushita Electric

Corporation of America

One Panasonic Way, Secaucus,

New Jersey 07094

SL-1200MK2

CONTENTS

PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . 11,12

ADJUSTMENT (Electrical) . . . . . . . . . . . . . . . . . . . . . . . . . .

DISASSEMBLY PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . 2,3

PARTS IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .

REFERENCE VOLTAGE AND WAVEFORM AT EACH IC

PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13,14

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,16

EXPLODED VIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17,18

REPLACEMENT PARTS LIST (Mechanical) . . . . . . . . . . . . .

ARM BASE ASSEMBLING PROCEDURE. . . . . . . . . . . . . . . . .

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SCHEMATIC DIAGRAM . . . . . . .

. . . 7,8

REPLACEMENT PARTS LIST (Electrical) . . . . . . . . . . . . . . . .

. . . . . . .

. . .

. . . . . . . .

TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISASSEMBLY PROCEDURE

How to remove panel cover

1 . Remove head shell and turntable.

2 . Secure arm with arm clamp .

3 . Remove 5 screws O of the panel cover as shown in

Fig. 1 .

How to remove stater frame coil and F.G detector

coil

4 . Remove 3 connectors O and 2 read wires @ from

power transformer as shown in Fig. 2.

5 . Remove 3 screws @ of the drive circuit board and 3

screws © of the stater frame cover as shown in Fig. 2.

6 . Disconnect 18 soldered parts O of the stater coil and

4 soldered parts O of the F.G detector coil as show in

Fig. 3.

7 . Remove 3 screws Q of the stater frame ass'y as shown

in Fig. 3.

How to remove bottom base ass'y

8. Remove 4 audio insulators. (Counterclockwise rotation)

9. Remove 17 screws and spacer Q as show in Fig. 4.

10. Remove 11 screws O as shown in Fig. 4.

How to remove stylus-illuminator lamp

11 . Remove 2 screws Q of the stylus-illuminator lamp

ass'y as shown in Fig . 5.

12 . Remove 1 screw O as shown in Fig. 6.

How to remove neon-illuminator L.E .D .

13 . Remov e 4 screws Q as shown in Fig. 5.

14 . Remove 1 circlip Q and switch cam

as shown in

Fig. 5.

15 . Remove strobo-illuminator case.

How to remove tone arm

16. Remove 4 screws Q of the arm base cover as shown in

Fig . 5.

17. Remove 2 screws © of the phono cord clamper as

shown in Fig. 5 .

18. Remove phono cord clamper as shown in Fig. 7.

19 . Remove 2 screws Q of the phono cord p.c.b. as shown

in Fig . 8.

20 . Remove 2 screws © as shown in Fig . 8.

21 . Remove 2 screws Q of the silicon oil dumper as shown

in Fig. 8 .

22 . Remove 3 screws Q as shown in Fig. 8 .

23 . Remove 2 screws 0 of the tone arm as shown in

Fig. 9.

Lamp caset

Fig . 9

Fig .

m PARTS IDENTIFICATION

Arm-height adjustment ring

Hinge

Balance weight

Power switch

Strobe-illuminator/

pilot lamp

Speed select buttons

Fig . 10

. ARM BASE ASSEMBLING PROCEDURE

1 . Attach the control ring to the arm base seat. (The

control ring should be roated counterclockwise .)

2 . Completely tighten the control ring, and then loosen it

1 .5---2 .5 turns to set the scale to "3" . (See Fig. 11)

5 . Rotate the control ring and make sure that the arm base

shifts within the range of 0-6mm. (See Figs. 14 and 15)

If it does not shift within the specified range, the arm

base position is deflected . In that case, disassemble the

parts and check as specified in step 3 .

3. Hold the arm base and set the red line mark on the arm

base to the scale near "2", then turn the arm base

clockwise . (See Fig. 12)

Note:

Take care not to allow deflection of the predetermined

positions of the control ring and arm base seat.

® ADJUST

SPRING

ENT OF CANCELLER

POSITION

If the arm body or PU base plate is replaced, be sure to set

the canceller knob to "0.5" and make sure that the can-

celler spring is in contact with the arm shaft. (See Fig. 16)

if the canceller spring is deflected, adjust it as follows :

1 . Clamp the arm on the rest.

2. Set the canceller knob to "0.5" .

3. Remove the PU base plate, adjust gear Q so that the

canceller spring is in the position of Fig . 16 .

4. Mount the PU base plate onto the arm base and cit~ck

the spring position .

Fig. 12

4. Adjust the arm base so that the red line mark on the arm

base is set to the scale "3" of the control ring. Next,

secure the positioning base plate with two setscrews .

(See Fig. 13)

SL-1200MK2

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 .

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 .

suspension

High sensitivity,

low mass, gimbal

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.

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

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.

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.

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 .

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 .

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