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@ SCHEMATIC
DIAGRAM
(Parts list on pages 35 ~ 40)
(This schematic diagram may be modified at any time with the
development of new technology.)
Note 1:
e $601-1, S601-2
: Speaker selectors.
$601-1:
A
S601-2:
B
S701
: Power "on/off" switch.
@$702
: Voltage selector switch. (For (G) area.)
$901
~ $910
: Preset-tuning (1-0) switches.
$901
: CH1,
S902 : CH2,
S903 : CH3,
$904 : CH4,
S905 : CH5,
S906 : CHG,
$907 : CH7,
S908 : CH8, S909 : CH9,
$910 : CHO
es911
: Music-scan/group-search switch.
@$912
: FM mode selector.
@ $913, $914
: Band selectors.
"
$913:
FM,
S914:AM
@ $915, $916
: Tuning switches.
$915: W(DOWN), S916: A (UP)
S917
: Memory switch.
S918
: Loudness switch.
eS919
~ $926
: Group registration switches.
$919 : start,
S920: rock, $921 : jazz
$922 : classic, S923 : easy, S924 : news
$925 : other,
S926: end
e@$927~S929,
_ : Input selector switches.
$931
$927 : phono, $928 : tuner, S929 : oo,|
ee :VCR1
© S930
: Tape-monitor/VCR 2 switch.
® Signal line
coon : FM OSC
<=>:
FM signal
==B8) - AM OSC
em
AM signal
cz
: Phono signal
: AF signal (Lch)
—(__}- : Positive voltage lines
--{__}-- : Negative voltage lines
© 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.
Indicated boltage values
are 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 voltage values,
depending on internal impedance of the DC circuit tester.
@ All voltage values shown
in circuitry are DC voltage
in FM
signal
(Stereo signal) reception mode.
* Figures in (
) Stand for DC-voltage in AM signal reception mode.
* 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 alminum foil.
* 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.
Note2:
¢ Use of ceramic filters in pairs
The ceramic filters (CF 201, CF202) 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 (D914, D915) for use as different diodes must be used
depending on each rank of the ceramic filters.
Color marking
(Blue, Red or
Note: © mark: Diode is used.
x mark: Diode is not used.
a47
SA-R177
SA-R177
1
2
3
4
e Remote-control transmitter (EUR64747)
B48
Chottering
simuhaneous|
push inhibit
=lo
Lg
thee
S x.
©
fz 2)
Key
input
contro!
circuit
Pulse
generation
circu
Pa
ei eid
b i e
He be
ELL
|
ao
(Z)
we,
Ea
1
» x
cA ceAes
(2)
)
Timing
generation
circuit
(o)
O-®
aa
cl
M50467-O18FP
(4)
CONTROLLER
¢ Remote control data code
Head
Custom
Inversion
Inversion
Data code
Custom code
Data code
pulse
code
a,
*Data "0"
«Data "1"
UL
El a
08
01100 | ovotoo | aw [Turere
| ovoov | ovorns |
foeckecmute | ore0r | ooornn | av [umes
|
ovo01__| 010000
«[oecKniay«
| o1oon | ooroor [ae [coe
| _o11o0 | _ovsou0 |
Pveunew | _or0o1 |
[ex [coe
|
01100 | or0001
Pruners |
or001 |
Lo100 |
[eps |
oto
[ae —[oecx pause] —oraor [0110 |
Trogariconinue | 01100
[stare
| — oreo] oro
11 [oop
|
ott00
|_ 30 [tuner2
|
otoo1 | oro001
foecxnays [01001
[ao [ooo
|
oreo —or1001 |
Fvaunedom
| —owor—tooror | 1 Jone}
~on1oo | oro010 |
[DECK stop | oro01__|__
000000
47
Tuner3
010010
feos
| ort00 | oro0nr
ee
:
[ocx ve
[oreo
| cootoo
[inere
[ooo] —oroorr
° 8
forint |
[copa
| 1100]
fossa
| oor |
21 [wing
|
voor |
Pruner? | 01001]
for ——*d onto _|
27 _[odsep
'| __on00
3/8
8
o|o
=
ae 8
:
ieee
3
8
3v
ai
Y Teed
2SC3265Y
@)
LED DRIVE
Error Check
~
\35 ms
tear TERY
— 18 —
FM ANT.
(75)
GND
EY
AM ANT
@
AM
LOOP
ANT.
EY tuner(Fm/am) circuit
Gno
Y
Loch
cd ©
r— REC ouT ©
VCR |
LpLayBack
©
r- REC ouT G
TAPE/VCR2
tpLavsack ©
Rech
co
©
r REC OUT ©
VCR |
Uptayeack ©
r- REC out ©
TAPE/VCR2
UpLaysack
©
TNIOI(FM
FRONT END PACK)
RALOOO6M
2SK544
FM RF AMP
2SCI675LIL2
FM OSC/BUFFER
AM ANT coil
AM OSC coil
c417
100P
ann
SS
eee
eee
C225
R233
18P
680K
Q2i0
2SCI740SQSTA
AM OSC BUFFER
t
875MH2-~IO8MHz
Vv (aM)
U ~ Bx:
Q101,102
vk
BS
2SC2785FETA
ge
FM/AM LooP FILTER
VU,
5 30kH2
=~ 1600kH?
C463
R457
457
C459
6.3V33
270
022
0.0068
C461
Se? 253.3
R461
R463
180K
i
*
C458
C460
0022
00068
R421
3.3K
|
WN
1c401
Essent
TC9I63N
INPUT
SELECTOR
R417
100K
WW
R418
100K
INPUT
SELECTOR
CIRCUIT
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