Technics SU-A80 - Page 19

li SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the development of new technology.)
Notes:
Teer
A
1.
$1
:
Power
switch
in
‘‘on”
position
13.
$751
~
753
:
Recording
selector
switch
in
“off”
position
|
Comp
ueceen
2.
$2
:
Voltage
selector
in
“240V”
position.
$751:
phono
$753:
source
=
(110V
+
220V
+
120V
+
240V)
$752:
tuner
3.
$101
:
Phono
selector
switch
in
‘“MM''-position
14,
|}
Indicated
voltage
values
are
the
standard
values
for
the
pecs
IC501
(MM
+
MC)
DC
electronic
circuit
tester
(high
impedance)
with
the
chassis
Subsonic
filter
eli
aetaa
4.
$251
~
258
:
Input
selector
switch
in
“phono”
position
taken
as
standard.
Therefore,
there
may
exist
some
errors
in
‘lector
$502
0505
°
{
_)
indicates
No.
$251:
phono
S255:
video/aux
1
the
voltage
values,
depending
on
the
internal
impedance
of
the
eats
are
right
channel
$252:
tuner
S256:
tape
3/DA
tape
DC
circuit
tester.
i
x
a
Ic6ol
$253:
CD
S257:
tape
2/VTR
Fignres
in
<
>
stand
for
DC
voltage
in
Video,
TV
signal
mene
20889
S55
0501
Balance
control
SVINJM4560DX
1C80l
$254:
TV/aux
2
S258:
tape
1
reception
mode.
Muting
2
ee
ran
peau
5.
$301
:
Front/Rear
selector
in
‘Rear’
position
15.
*
Phono
signal
lines
of
left
channel.
‘ch
stabilizer
)
L
ch.
PRE
OU
6.
S302
~
304
:
Tape
monitor
switch
in
“off”
position
16.
Positive
(+B)
voltage
lines.
Winds
$302:
tape
3/DA
tape
S303:
tape
2/VTR
;
17.
Important
safety
notice:
€8)
H
|
B
$304:
tape
1/ext
.
oS
/
af
Components
identified
by
“\
mark
have
special
characteristics
actor
switch
muting
Bett
AE
ies
7.
$305
:
Computer
contro!
switch
in
“off”
position
important
for
safety.
When
replacing
any
of
these
components,
=
1
“one
sit
Lie
8
‘control
8.
$501
:
Mode
selector
switch
in
“‘stereo’’
position
use
only
manufacturer's
specified
parts.
|
It
turns
“ON”
when
the
volume
is
minimized..
contro
:
VR801
(stereo
+
mono)
:
a
Ragone
ie
eck
hae
cpanel
es
aie
j=.
—
:
ae
be
eae
wateeet
fs
e
e
part
No.
of
transistors,
and
diodes
mentioned
|
|
“h
:
g
DC
a
pape
,
preene
Sultcrih.
ee”
pesitic
schematic
diagram
stand
for
production
part
No.
Regarding
the
e212
Bogert
balance
10,
$551
:
he
ti
os
h
in
“OdB”
position
part
No.
with
@
mark,
the
production
part
No.
are
different
|
svluPD40028C
Input
eeadj.
:
.
:
(ede
ons
per!
from
the
replacement
part
No.
Therefore,
when
placing
an
Input
selector
control
selector
AN6552F
(high
gain
11.
$701
:.
Operation
switch
In
“straight
DC”
position
order
for
replacement
parts,
please
use
the
part
No.
in
the
|
C203
I
muting
DC
servo
amp
amp.)
.
.
(straight
DC
+
via
tone)
replacement
parts
list.
=
ied
ah
_
a
e
H
|
ae
ae
Hen
om
13
1C203
|
12.
$702
:
Turnover
frequency
switch
in
‘‘150Hz”
position
SViuPD4072BC
(PHONO)
D>
roar
selector
(75Hz
150Hz)
@) &® control
ey
Cc
©
Ic201
frONO)
201 12
o<
|
x
Output
relay
BTUNES)
i
;
G
—_
eo
oa
2)
NF
tone
COT)
OGIO
€5)
Pace)
ANG5S2_
control
am
aad
©
0403,
404,
408
Opin
ais
a202
|
|
uffer
amp
A
on
j
maisom,
|
°
o
4-7
Ose
r
=
C
:
:
be
iy
OY
ae
a
—
3
(CD)
Ic702
71
eichnt
o
C2017
lovqro
INPUT
SELECTOR
*
gs
partials
pags
goo
Ky
@—@
ae
ANGS52
|
(Fron
OS
_it
fx
HEH
iwwentee”
3
$255
Buffer
amp
|
J
cl
Meet
aes)
ia
be
MS}
[ono
eo
ic202
—
D
:
9203
2}
||
|
Saner
ts
35870?!
ra
iS
& ri — er ba | 7
<<
Ce}
turnover
freq-
|
g
FRONT
tv
we
By
(tv)
uency
selector)
PANEL
INPUT
Hy
a”
$
7
Super
bass
control
roy
TERMINAL
ey
¢8)
as
|
ISOHz
(nea
=
@8)
me
(Tv)
a
.
o< | -@:=5 Memory capacitor #
To
1C20]/1~
1C205
p---
eee
_4
routTeG—
E
3
VDD}
terminals
|
vrr_
5t%o
1€203
(ee
Lin
yt
pe
Relay
drive
[Power
ON/OFF
muting
|
Ber
a
F
lpyeeeen
Ls
INVERTER
th
aso2
|
SSS
=>
=I
1402
=
ah | | | | E rue A OB pene
S
|
|
|
DA
TAPE
§j
c4os
8
@
[s[re
|i
fas
S255
|
|
|
L_w@6
ene
SI
u
[s[
2
hel
06
205
pyIDES?
eee
|
|
|
id
ef
7]
fg
cea
3s
+--+
>t-
Input
selector
|
|
“Ls
F
3
a
VIDEO
SIGNAL
INPUT
on/off
muting
ie
Ge
a
|
|
tv
até
0402,
407|
&
3
5
SELECTOR
CIRCUIT
D2(TAPE
3)
or
=
|
|
MAI50@3|
2
—
scbe,..
iP
FS
ete
et
ees
4
E
3
Q206 (TAPE 3) Q2I7
Inverter
—T
=
[Inverter]
=
AN78MI8 Rectifier
DIS(TAPE 2)
1C205 T Seo +HI7Z77V
Q401~ 406 Q409~ 41)
Q207
Z2
|
4
|
(TAPE
2)
2SA733
2sc3il2
MATISOnE
—_¢q
>
o
[io
F
BUFFER
BUFFER
I5V
ZENER
—
D4
(TAPE
1)
i
e056.
AN79MI8
Rectifier
8
a208
ic205
TAPE
1)
-178V
:
i+
BH
$251~S258
:
:
Input
selector
a
ot
+
5V
3
3
3
Rectifier
3
‘il
a = C413
+56V
$s
var
=1{5
=
—16-—