Technics SL 1700 MK2 Service Manual

Page 1

§ervice Man

ORDER NO. SD7907-1598

Direct Drive Automatic Turntable System

SI.- 1700M K2

(M), (MC)

cThe model SL- I700MK2 (M) I! available' In U. S. A. only.

0 The model SL-17ODMK2 (M0) Is available In Canada only.

TECHNICAL SPECIFICATONS (Specifications are subject to change without notice.)
(Weighs and dimensions shown are approximate.)

General
Power supply:
Power consumption:
Dimensions:

(W x H x D)
Weight:

Turntable section
Type:

Drive method:
Motor:
Turntable platter:

Turntable speeds:
Pitch control:
Starting torque:

Build-up characteristics:

Braking system:

Speed change due to
load torque:

Wow and flutter:

120V, 50 or 60Hz

17.5w

45.3 x 14.9 x 39.9 cm
(17727/32x5-7/8"x1545/64")
10 kg (22 lb.)

Quartz direct drive

Automatic turntable

Auto return

(Auto stop )

Direct drive

Brushless DC motor

Aluminum diecast

Diameter 33.2 cm (13-5/64 inches)
Weight 2 kg (4.4 lb.)

331/3 rpm and 45 rpm

16% range

1.5 kg-cm (1.3 lb-in)

0.7 s. (90" rotation) to 33-1/3 rpm
Electronic brake

0% within 1.0 kg-cm (0.87 lb-in)
0.01% WRMS (*)

0.025% WRMS (JlS C5521)

i0. 032% peak (IECQSA Weighted)

* This rating refers to turntable assembly alone, excluding
effects of record, cartridge or tonearm, but including

platter

Measured by obtaining signal from built-in

frequency generator of motor assembly.

Rumble:

Tone arm section

Type:
Effective length:

Arm height adjustment

range:
Overhang:
Effective mass:
Tracking error angle:

Offset angle:

Friction:

Stylus pressure
adjustment range:

Applicable cartridge
weight range:

(with auxiliary weight):

(with shell weight):

Headshell weight:

-56 dB (IEC 98A Unweighted)
-78 dB (lEC 98A Weighted)

Universal
230 mm (9-1/16")

O - 6 mm

15 mm (19/32")

12 9 (without cartridge)

Within 2° 32' at the outer groove
of 30 cm o(12") record

Within 0° 32' at the inner groove
of 30 cm (12") record

22°

Less than 7 mg (lateral, vertical)

0-2.5 9

6-10 g
13.5-17.5 9 (including headsheil)

95-13 9
17-2059
3.5-6.5 9
11-14 9 (including headsell) .
7.5 g

(including headshell)

; . Panasonic Company

3 I I ' h Division 01 Malsushita Electric
. eC nlCS Corporation 01 America

1 One Panasonic Way, Secaucus,
Nam lnrqnu fl7flflfi

Panasonic Hawaii, inc.
320 Waiakamilo Road, Honolulu,

Hawaii 96817

Malsushlta Electric 01 Canada Ltd.

5770 Ambler Drive,
Mississauga, Ontario
L4W 2T3

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SL-17OOMK2 '

I CONTENTS

TECHNICAL GUIDE. ..............
TROUBLE SHOOTING OF ARM DRIVE CIRCUIT .
DISASSEMBLY PROCEDURE ....... . . . . .

ADJUSTMENTS (Electrical) .
ADJUSTMENT POINTS. . . .
ADJUSTMENTS (Tone Arm) . . . . . . .
BLOCK DIAGRAM (Drive Circ tl ...........

i
_i
i
i
I

Pitch Central Circuit) ............... .
CONTROL CIRCUIT BOARD. . . . . .
DRIVE CIRCUIT BOARD. ...............

l LOCATION OF CONTROLS

Hinge

LOCATION OF CONTROLS ................. . . . .

BLOCK DIAGRAM (Control Circuit, Arm Control Circuit and

SCHEMATIC DIAGRAM 1 (Control Circuit Board) . . . . :18 ,;2o

REFERENCE VOLTAGE AND WAVEFORM AT EACH IC . , . 21
SCHEMATIC DIAGRAM 2 (Drive Circuit Board) ...... 22~ 23
TONE ARM DRIVE CIRCUIT BOARD . . .24~25
SCHEMATIC DIAGRAM 3 (Tone Arm Drive Circuit Board). .26
REPLACEMENT PARTS LIST (Electric Parts) ........ 27~ 28
EXPLODED VIEW (Main Basel ................ 29~3O
REPLACEMENT PARTS LIST (Main Base and Bottom Base Parts) .

EXPLODED VIEW (Bottom Base) .......

EXPLODED VIEW (Tone Arm and Arm Base) ........ 34 ~35

REPLACEMENT PARTS LIST (Tone Arm and Arm Base Parts)
.................................... 36

Arm-height adjustment ring

Balance weight

. Auto return switch

1 Turntable base

Turntable mat -

:_ Turntable platter

Arm clamp

Center spindle

Strobeviiluminator

Stop switch

£ i Stylus-Pressure ring

Arm lock knob

Anti skating control

Arm rest

Tone arm

Locking nut

Headshell

I Power switch_

(33 ram.)-
Speed selector switch-I:
(45 rpm.)-

Pitch Indicator

r
l

llluminator switch

Illuminator

Pitch control

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SL-17OOMK2 " M L ' '

How to install the drive circuit board assembly
The circuit board assembly can be detached by removing the 4

setscrews (D shown in Photo. 1. When installing it onto the Turntable- j
bottom base assembly after adjustment and repair, follow the pro- 5
cedure mentioned below. Center spindle
1. Temporarily tighten the 4 setscrews (D. @-

(Refer to Photo 1.)

2. Adjust so that the center spindle is aligned to the center of the
turntable provided with equal clearances ® as in Fig. 11.

3. Completely tighten the 4 setscrews (D, taking care not to allow Cabinet-
deflection of the center spindle.

[Fig. 6]

l ADJUSTMENTS (Electrical)

Notes: 0 Make the following adjustments after replacing parts such as IC's, transistors, diodes, etc.

0 Condition of the set 0 Instruments to be used
1. Power switch ..... ON 1. Oscilloscope fl
2. Pitch control ..... Center position 2. Frequency counter

3. Speed selector switch. . . .33 r.p.m.

Adjustment ::?:;Ctlon 9;]:tsstment Adjustment Method
gdgtixtstrent Frequency counter 1. Pitch control switch to center position.
A control $036 + --> TP27 VR301 .
(PITCH) - -> GROUND 2. Adjust VR301 for 262.08 kHz £0.05 kHz of frequency.
. Adjustment Frequency counter 1. Adjust pitch control switch for 269.94 kHz of frequency.
: of pitch
. +
B control LED _ : ggngND VR425 2. Adjust VR425 so that the LED (pitch indicator plus 3%)
: (GAIN) lights up.
STOP SIGNAL
Adjust VR201 for complete stop
Braking within 120°~270° after stop
C adjustment - VR201 270° Turmab'e signal initiated.
(BRAKE) (turntable becomes free a few
1 120° seconds after stop.)