Panasonic SG-D16 - SCHEMATIC DIAGRAM; FM;AM TUNER CIRCUIT; FM;AM ANT CIRCUIT; LED CIRCUIT

Mi SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the P
development of new technology.) escover, 4M ANT. «| Ssco7aem __ ine [EJFM/AM TUNER CIRCUIT vat
Not
A
FM
r¢
ral
re
203
Tel
ag
LO
otes: L202 cise =s
°
S71
:
Player
speed
selector
switch
in
“33-1/3
rpm”
position.
:
[es
OHO
MEAMGO:SADY:
ay
lo
e
$72
:
Player
start/stop
switch
in
“stop”
position.
ca
J:
|
seg
®
e $382 : DECK B muting switch in “off” position. QUO 9225 5 10225 a seis
° $383 : DECK A muting switch in “off” position. 2SC3313CTA eL ° AN7273B |
° $384 : DECK B motor switch in “off” position. ae emcee [o
e $385 : DECK A motor switch in “off” position AM ANT.
e $386 : Auto rec mute switch in “off” position. AM signal
° $401 : Editing switch in “off” position. ©
e $501~504 : Input selector switch in “Tuner” position. AM ANT. eebetort
$501:CD, $502: tape as FM OSC/ BUFFER
$503: phono, $504: tuner re asso FM_MONO
e $701 : Power switch in “on” position. B Ly FM/AM a 12k DISTOREION an
A . . Q907,909 Q908
¢
$901,902
:
Tuning
(up/down)
switch.
ANT.
r-7
Sass
2SC2785F
2SAII75FE™}
[S901: up, $902: down] : nl SIGNAL DET. _— STABILIZER
° $903 : Band (AM) switch CIRCUIT] = 904,905
e
$904
;
Memory
switch
BS)
228
2.40908,,
0905
11.4
2SATI75FE
: : é| fue ines e FM/AM SELECTOR
e $905 : Band (FM) switch. oL 3 :
e $906 : FM mode selector switch. aber tN | in Dl ti | FM IF DET :
e $907~914 : Preset tuning switch. sage hei ak :
$907: CH5/13, $908: CH6/14, S909: CH7/15, / aR 38 ———— Bi Seo ISTORII At +
$910: CH8/16, $911: CH1/9, $912: CH2/10, C2 [8 — :
$913: CH3/11, $914: CH4/12 c i 1. :
c24e 02} D907 E
°
Positive
voltage
lines
===>
AM
signal
co
Bi
ae!
g
Pe
nt
4++HH Negative voltage lines a¥ = 2SC2785F ae :
meeep
AM
OSC
signal
coon
FM
OSC
signal
SWITCHING
83h
——>
FM
signal
88
PB
signal
=a
AF signal uzzz> Rec signal ; 1 a
MHz MHz ; 3 8
e Important safety notice: ver it :
Components
identified
by
/\
mark
have
special
characteristics
:
important
for
safety.
When
replacing
any
of
these
components,
D
Q901,902
353
:
use only manufacturer's specified parts. Indicated voltage values peal cla eS
are standard values for the unit measured by the DC electronic enna <=
circuit
tester
(high-impedance)
with
the
chassis
taken
as
Osc.
r
:
standard. Therefore, there may exist some errors in the voltage sgeees
values, depending on internal impedance of the DC circuit tester. n) - :
1
'
A
A
*
Qs06
(11.0
+
¢
All
voltage
values
shown
in
circuitry
are
DC
voltage
in
FM
signal
a
2SC2785F
24s)
ew
UPDITI8G5I4
Lcp1069)
Se
a
(Monaural signal) reception mode. 38 SWITCHING 8, PLL CONTROLLER } 3 | 2 vb gvb of | as
Figure in ( ) Stand for DC-voltage in MW signal reception mode QL FM MONO sovee] | LIL 2 | Sor ees 8h ll
Figure in [ ] Stand for DC-voltage in LW signal reception mode =omee Be
Figure in (( )) Stand for DC-voltage in playback signal reception te
mode
E
me
88
eocboo
ys
Figures in« — ) Stand for DC-voltage in REC signal reception oe Sot Res 85 at
mode R912 10K R252 25,
© © eae ANA 4 MPX. VCO. ADy.
* Caution! 204
IC and LSI are sensitive to static electricity. 8 ©)
Secondary trouble can be prevented by taking care during repair. 2® oH -— |
* Cover the parts boxes made of plastics with alminum foil. olla
* Ground the soldering iron. as
* Put a conductive mat on the work table.
* Do not touch the legs of IC or LSI with the fingers directly. _Bveborasasnt
Quartz lock ind.)
F
LED
Cds
CIRCUIT KEY SWITCH CIRCUIT se] O?
S901 : Tuning up $907 : 5/13 ch 3 L 3
ace rune aoee see etteEn e|e tereo kHz FMMHz MW AM LW MEMO COM2 COM!
S908: Manet) a101va7ie fs : LCD9OI _— DISPLAY
$905: FM soil: 1/9 ch
S906: FM mode soi2 : 2710 ch Q9g10
me er 2SAlI75FE
—27—
G
<=
29