Panasonic Technics ST-CH7L - Page 18

ST-CH7L ST-CH7L
| SCHEMATIC DIAGRAM (Parts list on pages 11~14.)
1
2
3 4
5
6
7
Notes:
eS901,902
:
Preset
channel
switch.
(S901:
Up,
$902:
Down)
ZIOl_
FM
FRONT
END
PACK(SNVFE337601)
Ban)
eS903
:
Band
select
switch.
aan
|
2Sk193
OR
28K241
2SC
2668
:
.
a
ooo
oo
FM
RF
AMP
FM
MIXER
ifK
eS904
;
Memory
switch.
JKioif
[5
——
a8
6e-—
511
se
se
A38
?
nhs
sh
ppt
PMT
B:
LENE
ee
Te2
g
TP205
©S905,
906
:
Tuning
switch.
A
FM
ANT
ia
a
pth}
ss
(|
TI3
©
oo
ce
(S905:
Up,
$906:,
Down)
"pe
EAS
mee
b
&Lesl
yi
j
g
allo
eis
i
a251
J
hee)
[reek
$907,908
:
Timer
select
Switch.
rusian
$822
ad
3]
if
fe
:
|
Catal.
TO
awe
ate
oh
E
(S907:
Up,
$908:
Down)
Oa
-
:
ane
88
tv
ov)
Swircring)
|
wT
eS909
:
Timer
set
switch.
|
Bi
3
3]
|
sth
Stuwiece
iLovlew
len
|
flo
ef
je!
Seis
[i
Fi
eS910
:
Clock
set
switch.
©
+
:
320K
rg
freaieney
:
ee
ee
Oo
We
if
}
esgit
:
Timer
setting
confirmatin
switch.
ek
111
ientowe
=
"
‘
|
=
ie
Q201,
202
LM7001
(16M
(OV)
0.7V|
S912
:
Timer
cancel
switch.
|
c
2SC2669!
3
2SC2787LTA
Ov
O8
(650
$913
Pi
itch
AM(LW/MW)
~
FM
BUF
!
can
FM
1F
AMP
Be
ate
OUENEY
es
e
:
Power
swiicn.
signal
Te
uKIOt
|
>
viv
fiiv
Pssvfssv
L.
x
:
:
AM
ANT
oeose
FM
OSC
a
j
ee
&8
|
|\-
indicated
voltage
values
are
the
standard
values
for
the
unit
measured
by
ee
maT
ale
BF
<
a
*
if
*
2
c:
al
i]
206
C226
ca
the
DC
electronic
circuit
tester
(high-impedance)
with
the
chassis
taken
as
SS
yarn
@
tee:
|
_Aagh
i
easton
|
Sea
vier
|
.
i
—-
i
2UH
i
standard.
Therefore,
there
may
exist
some
errors
in
the
voltage
values,
B
AM
ae
|
|
:
2
Sag
SL
aol
g
(Sos
ae
eet
depending
on
the
internal
impedance
of
the
DC
circuit
tester.
Sila
cee
5
Eat
—s
|
eT
Bie
|
:
Deg
|
a
‘
|
rs
ZA
+
>
pg):
(
):
MWvoltage,[
]:
LW
voltage,
|:
MUTING
voltage
a
ne
8)
oer
“S60
laf
Pe
Sy
28
=
i|
|
le
eimportant
safety
notice
:
.
bat
er
|
|
3
Components
identified
by
A
mark
have
special
characteristics
important
hee
pT
es
|
)
0257
PLL
clock
=a
o252
~254
.
Liv
1K
Oey
‘|
bs
ia
for
safety.
When
replacing
any
of
these
components,
use
only
Me
oa
+
—
x
an
KSC
2785YGTA
ee
ag
AD
CN
el
KSC2785Y
manufacturer's
specified
parts.
a
ON"
BS
2
:
;
BUFFER
AMP(LW/MW
OSC)
—
LW/MW
SWIT|
A
aa
a
,
|
3g]
Mae
This
schematic
diagram
may
be
modified
at
any
time
with
the
I
ye
|
azss
‘ B
—
jf
development
of
new
technology.
Sige
:
MW3
ened
ee
Q101,102
0255,
256
eavl
oe
|
7
;
:
7
Qi
tie:
+=
SUMHE
2SC2785FETA
2SC2785FETA
“ol
Positive
voltage
lines
---—~
Negative
voltage
lines
EM
LOO
R-PICTER
EO
aN
|
i
|
:
u
L
i
13v
be
'
ooo00
Fi
SS
he
tr
/
i
rae
:
i
Roce
—s
prio
c
AY
MAIN
CIRCUIT
530kd2
oe
620TH
Perrmeerr
yal
be
UNE?
*
muas>
signa
;
—
.
;
-
cN903
cN902
(1/2)
AF
signal
lines
‘
ee
Ne
A
A
A
DEOROEOROROROEO
“
sont
S
er
ros
ae
cP903
Caution!
-
7
Ad
8
et
108
yb
BY
3]
=]
3)
4)
gi
3
IC
and
LSI
are
sensitive
to
static
electricity.
a
aera
Vem
cee
|
ExT
°
Secondary
trouble
can
be
prevented
by
taking
care
during
repair.
bagi
ey
oe
9906
-
er)
cy
|
|
B38
Cover
the
parts
boxes
made
of
plastics
with
aluminum
coil.
soot
f
fom
eaheluani
ais
oso
:
.
pas
see
Pte
it
+Ground
the
soldering
iron.
.
CERES
|
A
Mepe
NNey
i
(REMOTE)
Ae
=|
;
Ld
‘
A
i
i
Reo
y
i
+Put
a
conductive
mat
on
the
work
table.
Psat
YsoBt—
Psofs
4
ANY
av
oh
Ue
i
|
t
j
j
ji
D
;
j
PUMA
|
ee
|
A
«Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
=
|
AWA
|
2
soB
iC
©.
4
1
OME:
|
|
D
m
|
|
ite
|
[2]
|
sey
|
af
a
ral
es
|
:
|
|
|
a
hhdy
2)
@|
@|
i
a
a
Brea
|
ge
jad
|
|
ma
|
'
x90)
;
viel
|
ee
7
ire
til
i
|
S$
|
nai
6
:
7
he
ted
3
oes
|
bee
=|
Ce
ea
|
¢
oo
aa
Ws,
2
:
|
|
N
~
.
iy
|
||
OD
i
|
|
348
ae
als
vod
OSC2
OSCt
ENT
POWER
SOC
POWER
RST
SBT!
CE
SB0t
BLOCK
cuock
Oara
on
BTS
BTS
STR
DOWN
f
Hi
ne
eb
|
ic
901
o
ane
|
vo
[ver
“0
¢
e
;
a
eS
poly
é
(64
med
6
3)
g
(A&
SELECT)
(CLOCK
SET)
|
i
ia
|
|
(L
ov
3
ag
(
i
aan
3]
‘ea
ten
Vocal
UL.
|
Ov
SELECT)|
(RECALU
iI
+
b
tl
|
Le
|
ene
lett
¢
'
29
|
2
9
naa
!
;
$908
soi
|
||
Uimeg
SEN]
(cance.
|
{POE
Y
@
&2,,7
$9,2
ines)
'
$909!
$912 |
SNS
i
i
_
Resi
Roto
'
|
i
F
2.2k
1.8K
*: =
aN
Ge
,
|
|
O
Ps
5.3V
9
3s
:
ie
FL
DISPLAY
|
|
5.3V
=
|
1
!
a
FL
901
(RSLOO96-F)
OPERAT l ON acts 278
CIRCU IT (REMOTE SENSOR)