Technics QUARTZ ST-K50 User Manual

|
SCHEMATIC
DIAGRAM
(Parts
list
on
pages
19~21)
1
2
3
4
5
(This
schematic
diagram
may
be
modified
at
any
time
with
the
development
a
PRINTED
CIRCUIT
BOARDS
AND
WIRING
CONNECTION
DIAG
RAM
(Parts
list
on
of new technology.)
:
Le
ee
rout
Put
REMOTE
Notes:
[2]
orcration
SWITCH
PCB.
(GND
75.0%
ANTI[
ANT
ee
eg
CONTROL
©S701
:
Power
source
switch
in
“‘on”
position.
A
(AMP
%)
©S901~910
-:
Preset
tuning
switches.
[soos CH1, S902: CH2, S903: CH3, $904: one]
JK703
$905: CH5, $906: CH6, S907: CH7, S908: CH8,
$909: CH9, $910: CHO
©S911,S912 : Band selector switches.
(S911: FM,S912: AM)
S914 : Memory set switch.
S915 : FM mode selector switch.
©S$916,$917 ; Tuning switches.
($916: down, S917: UP)
©SK703 : Voltage selector switch in “‘240 V” position. B
; (110 V/127 V/220 V/240 V)
For (GC), (PX) areas
@\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 valtage volues,
depending on the internal impedance of the DC circuit tester.
( ): AMvoltage ,{__]: MUTING voltage
Positive voltage lines = = = Negative voltage lines
aooo> FM OSC <——|> FM signal
mweeep AMOSC mau AM signal
coneses AF signal lines Cc
[ME MoRY]| FM MODE |
(AM)
(DOWN ¥w )
r{eann}y
(FM)
SS
|
Zz
“)
e
——
e|mportant safety notice
Components identified by A mark have special characteristics important 7
for safety. When replacing any of these components, use only
manufacturer’s specified parts.
(0)
«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.
(9)
(8)
hr
.
/
«Do not touch the legs of IC or LS! with the fingers directly. od | i FM offset Woltage (Omv)
iy
a : ui
@ TERMINAL GUIDE OF IC’S, TRANSISTORS AND DIODES = |
2
LM7001
AN7273W
LC6512A3997
2SA933SQRSTA
2SC2787LTA
3
©
SVIUPC1161C3 - ~
9,
ee
iron
2SC03311A-Q
,
DAT144ESTP a
DTC124ESTP “15
DTC144EKT96 E =~ :
ind ' |
2SC3940AQSTA
1SS254TA
MA4051MTA
LNO18304P
E:
$
:
1SS291TA
MA4062MTA
a
4
il
1SR35200TB ee o 5) : 7)
GP
oe
Pe
ig
8
Cc
REMOTE
a, Cathode SENSOR PC.B.
Anode A o— Ca
F a
(1)
-13- -14-

Technics QUARTZ ST-K50 Specifications

General

Brand	Technics
Model	QUARTZ ST-K50
Category	Tuner
Language	English