Technics SA 104 Service Manual

Page 3

AM WW"? WMa' AM levnxabal _ Mam speakev mnninals
antenna coil

FM amanm- AC Bullet (Unswitchadl

terminals

I ' Vohage selecwr

® 9 9 Q) (on (he bonomview!

Ll-l-l-Remote speaker tuminal:

' The power suppv for this unn varies depending upon the areas.
Also, the pans used for power supply are different So. refer m
the cimml diagram and the replacement parts lisx.

' [XA] area ls prowdm with voltage selector and Ac ouUet.

Phono inpm capacnance is about 150p}?

Ground
Phnno input

Aux mpu!

Iec nut

Tana-l
olavback

Rec/play (DIN) socku

Voltage amp. 8: Dower amp. IC- FM IF amp. 5. FM dewuor circa

Tuning gang

Power supply civcuit

Equalizer cucuu

Tone circuix

FM MPX circuit

I BEFORE REPAIR AND ADJUSTMENT

Turn of! (he power supply and shortrcnrcun both ends of power suppw condensers [C701,C702,4700uF}at
resistance (about 10!), SW) m order to dxscharge the chargéd votage Avoid short-civcun wilh a screwdriver or (he like,
otherwise the lransismrs or diodes may break down

Before wining on [he pewer supply ailev comulexion oi yepair, sowv apply [he pnmary vallage by using a voltage
regulator to make sure that the currem consumed us free of abnbrmalfty The current consumed at 60Hz/SOH2 m no-
signal mode is 1 10V (120 ~ SOOmA), 120V: (100 ~ 24DmA)1220V [50 " IEOmA). ZAOV (40 ~ I20mA).