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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
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