Technics ST-G3

10 11 12 13 14 15 16
@ SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the
development of new technology.)
% The part No. of transistors, IC and diodes mentioned in the schematic diagram
stand for production part No. Regarding the part No. with (yr) mark, the pro-
duction part No. are different from the replacement part No. Therefore, when
placing an order for replacement part please use the part No. in the replacement
x part list.
c C309 serves eke Note 1:
| 1. S1~S8 : Preset tuning switch.
1~16 CH
oltage
OmV
Oa
2.
$11
:
Memory
switch,
(manual
<«—®
auto).
3. $12 : Tuning (up) switch. [up : tuning to higher frequency]
an 4. $13 : Tuning (down) switch. [down : tuning to lower frequency]
5. $16 : FM selector switch. ( —= frequency shift +25 kHz)
_ CONTROLL INPUT 6. $17 : AM selector switch. ( —= allocation 9 kHz/10 kHz)
Ss : . 7. $18 : FM mode switch. (auto «—® mono).
xt ST C303 = = Power source circuit 8. $20 : Scan level switch. ( —dB, — level)
$3 cal 3 g @ For [XL] area 9. $21 : FM signal — strength indicator switch. (off «—® on)
zg : z we wm a
===>
e——)
&
mentor
e
oie
Seay
Sites
10.
$701
:
Power
source
switch
in
‘‘on”
position.
=a
me
3
|
!
11.
$702
:
Voltage
selector
switch.
THIOL
33K
;
[XA],
[PA]
(110V
«127
V<«—»220V
«—»
240V)
Pees
|
[PE]
and
[PC]
| ; only
a 12. Indicated voltage values are the standard values for the unit measured by the
es
i
;
DC
electronic
circuit
tester
(high-impedance)
with
the
chassis
taken
as
standard. Therefore there may exist some errors in the voltage values,
4
0701
,702
D305 4 se SVDSR1K2 ' depending on the internal impedance of the DC circuit tester.
MA4082M8e aaa } . * Voltage with numerical volume only is the voltage with FM mono signal
8.2V ZENER © 2 ¢ 3 | H ria received.
“oS
i
4
25225
:
*
Figures
in
[____]
stand
for
DC
voltage
in
muting
mode.
Oh
t
ie:
.
.
:
Pi
=r
Signal
st
h
level
+
2”
a
(2)
Figures
in
(
)
stand
for
DC
voltage
in
AM
signal
reception
mode.
23 ee se bo e| Se tes | 13, <== FM signal mana AM OSC
u
H
Signal
TSTRENGTH
<a;
<
I
;
;
ere
an
a>
AM
signal
‘AF
signal
lines
oO
2.
CEVEL”
abs
cee
a
8
Ean
CY)
*
[XL]
---
Australia
coon
FM
OSC
———
Positive
voltage
lines.
8
47
Se
ees
3
8l
gh]
ou
soT
14.
Important
safety
notice:
iat
©}
«38
$
é]
3
Seles
ISV
ZENER
op
4
Components
identified
by
A\
mark
have
special
characteristics
important
for
1L80V
ay
@
0926,927
aya}
8
ses
@)
safety.
When
replacing
any
of
these
components,
use
only
manufacturer's
AM 4 MAI65 (3) specified parts.
1 «02
<> 1611 | Refer to Note 2 &3 N 2:
kHz
ki
@)
T
ae
5°
re
LL
lote
2:
3) 4
x2 @ . : ¢ ae C | A e Use of ceramic filters in pairs
_ (| \ | MA Maiso} ge08 Q701, @702 S ce BACK UP (sev | C] f 5 CE for EM-IF
=
=
oy
(ND
a
1
1
|
|
fe
]
|
]
1
2 fs me 2SA564 2SC 1815 maaocem” | AMO Kb AFI TS00ma La ke se 220v The ceramic ilters (C 101, 102) for | circuit are available in
vee
els
“Ato
two
ranks.
For
this
machine,
be
sure
to
use
the
ceramics
of
the
same
rank
Ln
oO
o
.
.
coms = roduc for ag 3 gh SH 8 Ina patr.
Como 4 CxA) only FR\e20 ele oe At repairing and replacement, pay close attention to the diode (D901,
seq.0
65)
ee
D902)
for
use
as
different
diodes
must
be
used
depending
on
each
rank
of
sea 69) 2-9) the ceremic filters.
B4V
ee
i
Passa
as
at
ss
&: inh ees if MATES o nn) 17 ar ape rom Color marking RANK CENTER
§ F 3s ae @ 463+ fn re poem" 0 (Red or Black)
D a 3 et | £2, pte | sR) (Color) FREQUENCY
69 Sn SN
0216 TT <2} Red Xx Xx 10.70 MHz
D917
> )
ugI9
Ten
+—+t
al
:
4
al 0920 Ko) Sasa lies Note: © = Mark Diode is used.
o-4 >
rai
19x
|
oe
Ss
Rea
*[XA]
---
Asia,
Latin
America,
Africa,
X
Mark
Diode
is
not
used.
5666.6.56.4 “ Middle Near East and Oceania.
*[PA] --- Far East PX.
*[PE] --- European Military.
*[PC] --- European Audio Club.
Si Sia