Technics SL-220 Service Manual

m@ TROUBLE SHOOTING GUIDE
Except when checking voltage, disconnect the power cord before repair without fail.
TROUBLE
CAUSE
REMEDY
Turntable speed
A. Switching on does not cause
turntable to rotate.
Come off belt from capstan
(Remove bottom cover and, using OC
voltmeter, check printed base voltage)
Install the belt to capstan.
2. No output of constant-voltage circuit
(1) No output on secondary of transformer,
* Cord disconnected. * Replace cord.
* Soldered improperly. * Solder securely.
* Power transformer defective, * Replace power transformer,
3. Output of enstant-voltage circuit is
9.6~14.4V_
* Motor ass’y defective. * Replace motor ass’
4. Speed selector switch defective
* Contact faulty. * Replace speed selector switch.
* Soldered improperly. * Solder securely.
8. Turntable speed too slow. 1, Constant-voitage output is not 9.6V ~
14.4V,
* Power transformer defective. * Replace power trans.
2. Constant voltage output is 9.6V ~ |
14.4V
* Motor ass’y defective. * Replace motor ass’y.
* Speed unadjusted * Adjust semi-fixed resistor VR3 & VR4.
C. Turntable speed too fast. 1. Constant-voltage output is not 9.6 ~
14.4,
"Power transformer defective. * Replace power transformer.
2. Constant-voltage output is 9.6V ~
14.4V.
Motor ass'y detective.
Speed unadjusted.
* Replace motor ass'y.
* Adhust semi-fixed resistor VR3 & VRA.
|
D. Turntable speed varies too much.
Motor ass'y defective.
Belt defective.
* Replace motor ass'y.
* Replace belt.
€. Turntable. after stopped by hand
will not tusn or starts turning but
will stop soon,
Motor ass'y defective.
* Replacd motor ass'y.
F. Operative at only one of two
speeds.
(33-1/3 r.p.m or 45 r.p.m)
Speed selector switch defective.
Leadwire disconnected or unsoldered.
Contact of VR1, VR2 insufficient.
* Replace speed selector switch.
* Replace leadwire, or solder securely.
* Replace printed base ass'y.
G. When actuating, turntable speed
is unsteadly for a long time.
Motor ass’y defective.
* Replace motor ass’y.
Noise
Offensive noise is hears.
Power transformer makes loud noise
of vibration.
* Replace power transformer.

Technics SL-220 Specifications

General

Drive System	Belt Drive
Speeds	33 1/3, 45 rpm
Wow and Flutter	0.045% WRMS
Dimensions	430 x 130 x 375 mm
Type	Semi-automatic
Motor	DC motor
Effective Length	230 mm
Overhang	15 mm
Platter	Aluminum Die-cast
Tonearm Type	Static balanced tubular arm
Cartridge Weight Range	6g