Technics ST-G460 - Page 10

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MAI6G5TA :
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2x
FM
MPX
VCO
adj.
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R307
270K
390P---(EG,
E1,
6,
PX)
D302 R308 50v33---(GN)
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CLASS AA
OUTPUT AMP
(G,GN,PX) areas.
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2.2 H---{EG,E1)
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For (G, PX) areas.
At701 AS702
A ac 11027/220/240v ---(6,Px)
AC 220V --- (EG,E1)
AC 240V--- (GN)
{50/60 Hz }
B
SCHEMATIC
DIAGRAM.
(Parts list on page 19, 20, 22, 23)
(This
schematic
diagram
may
be
modified
at
any
time
with
the
development
of
new
technology.)
Note 1:
©S701: Power switch.
eS702:
Voltage
selector
switch
for
(G)
and
(PX)
areas
©S901~S$910: Preset tuning switches.
$901: CH1, S902: CH2, $903: CH3,
$904: CH4, S905: CH5, S906: CHE,
$907: CH7, S908: CH8, S909: CHS,
$910: CHO
©S911, $912: Band selector switches.
$911: FM, $912: AM
eS$914: FM mode selector switch.
©S915: FM signal ON/OFF switch.
eS$916, $917: Preset channel switches.
$916: DOWN, S917: UP
S918: Memory switch.
©S$921, $922: Tuning switches.
$921: UP, $922: DOWN
¢ Indicated voltage values are the standard values for the unit
measured by the OC 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 OC circuit tester. ( ): AMvoltage
Positive voitage lines amet AP signal lines
coca FM OSC c———> FM signal
anne
AM
OSC
mma
AM
signal
eimportant safety notice
Components identified by “. 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
(CF101,
CF
102)
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
(D907,
D908)
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 D907 D908 !
10.7 MHz FREQUENCY
Note: © mark: Diode is used.
x mark: Diode is not used.
* Caution!
IC and LS! 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
sdlidering
iron.
|
* Put a conductive mat on the work table.
*
Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
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