Technics SA-290 - Page 7

12 13 14 15 16 17 18 19 H@ SCHEMATIC DIAGRAM
Note 1:
Ds61~563 MAIN 1. $501~S$503 : Input selector switch in “tuner” position.
D564
¢609_
IOP
R719.
120K
$501
——
phono
$502
——
tuner
|
LN446YP igi... $503 — CD/aux
i kc 2. $504 : Tape monitor selector switch in “source” position.
== tape/ext, Mi source)
a ees MAIN 3. $601 : Main speaker switch in “‘on” position.
wn
Seg
aa
ce,
|
(mon,
M
off)
Ee E Bo R ch 4. $602 : Remote speaker switch in “off” position.
> Oo (mon, Hf off)
SPEAKERS 5. $603 : Loudness switch in “off” position.
BS
(mon,
Mf
off)
C663
S++)
6.
$604
:
Speaker
impedance
switch
in
“4~6Q”
position.
L ch 7 (4~60 @— 8~16Q)
; Q S REMOTE 7. $701 : Power switch in ‘‘on” position.
SVI 3001 oe (mon, & off)
2H-POWER AMP “7 =) cee4 R ch
«| 0.01
& 8. $901~S908 : Preset tuning switch.
e ‘s © $901 ——- CH1/CH9 S902 —— CH2/CH10
8 8 SPEAKER SELECTOR S903 —— CH3/CH11 $904 —— CH4/CH12
oe =e 2. $905 —— CH5/CH13 S906 —— CH6/CH 14
oT
(Tuner)
ee
S4
|
|
33
g
;
S907
—CH7/CH15
$908
——
CH8/CH16
: gE = 8S
R626
1/210
D708
(S911 —— FM, S913 —— AM)
12. $914,915 : Tuning switch.
(S914 —— up, $915 —— down)
13. <==) FMsignalline m= AM signal line
FM OSC coment: AF signal line
nae AM OSC Positive and negative voltage line
14. Important safety notice:
Components identified by A\ mark have special characteristics
important for safety. When replacing any of these components,
use only manufacturer’s specified parts.
e Indicated voltage values are the standard values for the unit measured
by the DC electronic circuit tester (high-impedance) with the chassis
taken as standard. Therefore, there may exist some errors in the
(HEADPHONE) voltage values, depending on the internal impedance of the DC circuit
Pb ite eto tester.
a
All
voltage
values
shown
in
circuitry
are
DC
voltage
in
FM
signal
$503
(CD/Aux)
J3
: fo eae 9. $909 : Memory switch in ‘‘manual’” position.
Ug (2) Lo oO S602 (manual —— auto)
» . | ont rie 10. $910 : FM mode selector switch in ‘‘mono”’ position.
& ae Ld! iE , (auto —— mono)
Pe eH _ ; 11. $911,913 : Band mode selector switch in “FM” position.
vig {D713 0714
aweeo |MA4120-M D713
Signal
(BALANCE)
VR502
1OOKG
IC 50I
AN6558F
TONE CONTROL
AMP
Q704
2SA992
RELAY DRIVE
= 5 l|
‘eae ¢
S) ©) ©) ©) C643 0.001
1/2 330
A r627
Q707 Q705,706 ; ;
re
=
2SC2785
2SA1175
(Monaural
signal)
reception
mode.
=
MUTING
MUTING
Figures
in
(
)
stand
for
DC
voltage
in
AM
signal
reception
mode.
Original Part No. Supplyment Part No.
D915,
D916 MA150 MA162A
D701~704 SVDS3V20 SVDS3V40
Note 2:
MUTING & DETECTION
(VOLUME)
AC 220V
$603
A 50/60Hz
(LOUDNESS)
R722 47K
AC INLET
R521 18K
@ Use of ceramic filters in pairs
The ceramic filters (CF201, CF202 and CF203) for FM-IF circuit
&
Lily
[5.7 V]
C704
Q701 taal We x. a & are available in two ranks. For this machine, be sure to use the
=
ea
ena
96)
Eee
(44)
@
a
ceramics
of
the
same
rank
in
a
pair.
75 y 15.5 2. ON 28 = a) a eae At repairing and replacement, pay close attention to the diode
YL © 7 . °
9 8 ~= [deem eo lie a a (D915, D916) for use as different diodes must be used depending
K os] 58 ream 3)4—-C_) 0 on each rank of the ceramic filters.
185 : | ; i ioe
Q703 ° 2 S Te One. Y
= et i
4 > 2
8 &
0702
2SC2785F
REGULATOR
He es ae
2SCIS84NC
REGULATOR
MA4062mM
=
28 x <6 cE g ,
Se | SOT YW =z is (U)) A (U) Note: © Mark Diode is used.
4 PL2 A PLI lark Diode is not used.
ale LCD FRONT PANEL X Mark Diod
2 ch SRIK2 LAMP LAMP
uo