Technics ST-600 - Page 12

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*Power s
A
T AC 220V--(E,EH)
AC240V--(XL)
(50/60H2)
*Power source
A
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For (XA,XBJ areas
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(50/60Hz)
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Mi SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the
development of new technology.)
Note 1:
$1 : Power source switch in “on” position.
eS2
:
Voltage
selector
in
‘240
V”
position.
(for [XA] and [XB] areas only)
¢ $901~S910: Preset tuning switch.
$901:
CH1,
S902:
CH2,
$903:
CH3,
$904:
CH4,
$905:
CH5,
S906:
CH6,
S907:
CH7,
S908:
CH8
S909: CH9, S910: CHO
© $911 : FM select switch.
© $912 : AM select switch.
e
$914
:
Memory
set
switch.
(manual
—
auto
memory)
© $915 : FM mode switch.
e $916 > Tuning (down) switch.
[down: tuning to lower frequency]
° $917 : Tuning (up) switch.
[up: tuning to higher frequency]
¢ 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. ( —_): AMvoltage
e ——— Positive voltage lines s * AF signal lines
coon} FM OSC <=> FM signal
aaae> AM OSC mama AM signal
© 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.
.
Note 2:
© Use of ceramic filters in pairs
The
ceramic
filters
(CF201,
CF202)
for
FM-IF
circuit
are
available
in
three
ranks.
For
this
circuit,
be
sure
to
use
the
ceramics
of
the
same
rank
in
a
pair.
At repairing and replacement, pay close attention to the diodes
(D906,
D907)
for
use
as
different
diodes
must
be
used
depending
on
each rank of the ceramic filters.
Color marking
(Red, Black or White)
RANK CENTER
SFE
10.7MHz
(Color)
neve
D907
|
FREQUENCY
10.76 MHz
wits fo |»
Peex | » | 01
Note: © mark: Diode is used.
x mark: Diode is not used.
* Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during repair.
* Cover the parts boxes made of plastics with aluminum coil.
* Ground the soldering iron.
+ Put a conductive mat on the work table.
* Do not touch the legs of IC or LSI with the fingers directly.
—15—