Technics SA-222 M

Fe ‘s
y
ig
|
SA-222
m@ SCHEMATIC DIAGRAM
Q601, 602
2SA992
R625 1/4 47
PRE DRIVE
cé27 R627
0.047 1/2 10
@ Note:
ie A 1. $1,2: Band selectors switch.
S “| S1—FM
S2—AM
MAIN 2. $3,4: Tuning switch
&) | S3 — down
R S4 — up
S) 3. $5: Memory switch.
4. S6~12: Preset-tuning switch.
S6 — 1ch, S7 — 2ch, S8 — 3ch, S9 —4ch,
&) $10—5ch, S$11—6ch, S12—7ch
7 5. $14: FM/AM allocation switch in ‘FM 0.2MHz/AM 10kHz step” position,,
C)
FM
0.05MHz/AM
9kHz
step
-——=
FM
0.2MHz/AM
10kHz
step
REMOTE 6. $15: Automatic-scan switch in “on” position.
H
|
B
on
~«—+
off
(manual)
R 7. S16: FM muting/FM mode switch in ‘‘on/FM auto” position.
-) on/FM auto «—-off/FM mono
(REMOTE) 8. $401 ~403 : Input selectors switch in ‘‘tuner’’ position.
[S401 — aux. S402 —tuner, S403 —phonol
9. $404, 405: Tape-monitor selectors switch in ‘‘source’’ position.
[S404 — tape 1, S405 — tape 2]
10. S406: Loudness switch in “‘off’’ position.
11. $407: Subsonic filter switch in “‘off'’ position.
EABBGONES:
12.
$601,
602
:
Speaker
selectors
switch
in
‘‘main”
position.
[S601 — main, S602 — remote]
13. $701: Power switch in ‘‘on”’ position.
VR50I-2 R504
(BASS)
D713 ~ 715
SVDSRIK2
SVDMZ306C
0709, 710
o7t
SVDMZ306B
R708 270K
----O?---4
Q70! Q702~~ 704
2SC 1815 2SAI10I5
REGULATOR REGULATOR
0701 ~ 704
SVDS2V20
Fl (25V 2.54
0707, 708
SVDSR | K2
Cc
14.
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
voltage
values,
depending
on
the
internal
impedance
of
the
DC
circuit
tester.
*
Figures
in
(~_}
stand
for
DC
voltage
in
FM/AM
signal
reception
mode.
*
Figures
in
< >
stand
for
DC
voltage
in
FM
stereo
signal
receptiom
mode.
*
Figuresin
™
stand
for
DC
voltage
in
FM
(no
signal)
muting
to
on
mode.
*
Figures
in
(
)
stand
for
DC
voltage
with
the
band
selectors
circuit
set
at
AM.
15.
Transistor
and
IC
terminals
which
carry
no
voltage
indication
emit
5V
pulse
waveforms
or
are
subject
to
change
according
to
the
frequency
or
input
signal
levels.
16.
Signal
lines
c—
>
FMcomposite
signal
eeewe
Audio
frequency
signal
ems
Positive
voltage
lines
mp / asap AM signal
E Shorting Switch (S401, 402, 403, 406 and 407)
This unit uses a shorting switch. As illustated below, the circuit is shorted
to the next circuit without being opened.
In the circuit diagram, the shaded area represents the common terminal.
Connected to circuit A Circuit A is shorted to circuit B Connected to circuit B
r
'
;
F u
Common A B
An example of circuit diagram
(a Ne ee ee 7
Circuit A ioe !
| o” ' '
{Common? ee ei itcuit B|
i Circuit B Common ircuit Al
Pe ea oe en ee SS et oa os cous
H
I