Technics SU-3 - Page 10

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SCHEMATIC
DIAGRAM
D301
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Bots
doo
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pa
hadi
rte
Power
amplifier
circuit
Muting
and
protection
circuit
(
This
schematic
diagram
may
be
modified
at
any
hr) waiso SVDMZ306A time with the development of new technology.)
6V ZENER -
@ The part No. of transistors, IC and diodes mentioned in the
schematic diagram stand for production part No. Regarding the
part No. with © mark, the production part No. are different
from the replacement part No. Therefore, when placing an order
for replacement parts, please use the part No. in the replacement
Parts list. ~
IC 401 AN7072.
MUTING & PROTECTION
| Co8} G3) Req Res fe40 (0 ) &3)
® This is the basic circuit diagram (For continental Europe) of this unit. |
Note that part of the circuit is subject to change depending on the areas. |
@ Regarding the circuits to be changed in the basic circuit diagram (For |
continental Europe) and related areas [EF] ,[XL] ,[XA] and[Ew],
refer to “CIRCUITS TO BE CHANGED AND THE AREAS” on page 10.
Notes:
1. $1—1 ~$1-—3 ; Input selector switch in ‘‘phono” position.
(S1—-1: phono S1—2: tuner $1—3: aux)
D404
R407 39K
2CH POWER AMP
| ru 7 :
= : : 36 |
: : : n C313 C35 |
: : : ; a) 0.022 0.022
3 . : : gmo :
Se eke) ere Re . +a :
r ; : ) ; z 2 7
;— | : :
(cite eon] Pai q 3
$2 Cc ) : : : :
ome mom : : : :
L 4 : : : :
(SUPER 3 : : D 3 ‘@
BASS)
:
4
:
:
:
=
} | a | IC 301 : |
SVIK4121-2ML
q
2. $1-4 | : Tape monitor switch in ‘‘source’’ position.
source <—> tape/ext.
3. $2 : Super bass switch in ‘‘off” position.
4. $3 : Power source switch in ‘‘on”’ position.
5. S4[XA] area : Voltage selector switch in “°110V” position.
C323 I6VI0
y +
120V ++ 110V <> 220V «<> 240V
6. The headphone jack switch is being short-circuited.
(With the headphone plug not inserted)
7. 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. |
8. [ indicated voltage values are the standard values for the DC
electronic circuit tester (high impedance) with the ground point
taken as standard. Therefore, there may exist some errors in the
voltage values, depending on the internal impedance of the DC |
circuit tester. (high tap) |
9, muaguienuenue P hono signal lines
10. mmm Positive (+B) voltage lines
11. mmme® Negative (—B) voltage lines
t+
ey
|
aia
|
:
| | igo |
Posistor
(130°C)
Q401, 402
2SA992
OVER LOAD DET
Q403
2SA 1015
HEAT DETECTION
VR 303-2
C328 p344 VR304-2
TREBLE
Lo
ircui
CONTROL
|
CONTROL
Tone
control
circuit
Oe
4
VR3O0I-2
(VOLUME)
SUP 26530F
“
a | 323¢-H®
mot
S
@Oq
P|
|
7° (RR)
H _ SUP26530B
a
R302
AFI
TS500mA
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e
O
7.
r
Ei
Dea
eOs
AII5OM
iz
0606
BALANCE
|
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SVDSRIK2
Cam
an
CONTROL
(EE
|
5.4
t
D606
|.
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D50!
SVDS4VB20 § freee a oe Se ee
RECTIFIER
fa)
w i
x r
oO ;
5
c
a
5 a
AC 50/60Hz
<
‘
220V (For continental Europe)
240V (For United Kingdom) :