Technics ST-G560L

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AN7274NS
AY : FM IF AMP & DET/ AM CONV.
C205 K0.001
12 13 14 15 | 16
FM DET. coil TP 301
1C301 9
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g FM MPX
R307 270K
C313 390P
R311 15K
Q301,302
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POWER SWITCH
CIRCUIT
OPERATION
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Q304
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AC 240V--(EB)
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REGULATOR
5.5V
C706 16V2200
-13-
| ST-G560L
a SCHEMATIC DIAG RAM (Parts list on page 19~22)
(This schematic diagram may be modified at any time with the development
of new technology.)
Note 1:
S701: Power switch.
@S901~S910: Preset tuning switches.
$901: CH1, S902: CH2, $903: CH3, S904: CH4,
[ss CH5, S906: CH6, S907: CH7, S908: CHB,
$909: CH9, $910: CHO
©$911~S913: Band selector switches.
$911: FM, $912: MW, S913: LW
©S914: FM mode selector switch.
$915: FM signal ON/OFF Switch.
$916, S917: Preset channel switches.
$916: DOWN, $917: UP
S918: Memory Switch.
$919: FM iF band switch.
$920: Tuning mode switch.
* 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 DC circuit tester. ( ): AM voltage
Positive voitage lines set AP signal lines
coco FM OSC ———> FM signal
manna AM OSC sumae> AM signal
Gamma IF super narrow 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 (CF101~CF104) 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)
yj
SFE
RANK
;
10.7
MHz
(Color)
D907
D908
CENTER
FREQUENCY
ns
es
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.
—14-