Technics RS-BX828 - Page 23

RS-BX828
|
|
RS-BX828
RS-BX828
5
6
7
Wi
SCHEMATIC
DIAGRAM
(Parts
list
on
pages
44~48.)
(This
schematic
diagram
may
be
modified
at
any
time
with
development
of
new
technology.)
Lyman
CIRCUIT
vKi i R31 560 C45_1GVIO
Notes:
A
ice
e
JK703:
Voltage
selector
in
“240V”
position.
(For
[GC]
area.)
PLAYBACK
(110V
+
127V
+
220V
+
240V)
ae
3[s
7
a
—
¢
$701:
Stop
switch
(Ml
STOP).
Pare
316
(Sk
séa0r
AN7351K
=
7
7
°S702:
Fast-forward
switch
({(TPS]
PP).
ee
8
rs]
wel
aoe
ae,
Peer
eee
ae
ae
a
8p
33
ea
°
$703
:
Rewind
switch
(<4
[TPs).
aecoepae
8
23
i
stor
|
=
Tok
2
3
pes
yk
+704:
Playback
switch
(>
PLAY).
a
b
28
|}
—__t
¢
$705
:
Record
switch
(@
REC).
:
-—+—
¢
S706:
Pause
switch
(IB
PAUSE).
ce
a
ear
ales
¢
$707:
Dolby
noise-reduction
switch
(Dolby
NR;
C).
‘om
a8
Pe
ves
:
rms
oi?
¢
$708
:
Dolby
noise-reduction
switch
(Dolby
NR;
B).
ar
2
f
a[é
¢
$709:
Multiplex
filter
switch
(MPX
FILTER).
B
oid
ie
;
ov
i
38
oev
(
p-L ch Q
°
S710:
Counter
reset
switch
(COUNTER
RESET).
°
S711:
Counter
mode
switch
(COUNTER
MODE).
S712:
Meter-range
selector
switch
(METER
RANGE).
$713:
Memory
mode
switch
(MEMORY
REPEAT/STOP).
¢ $714: APRS switch (APRS).
¢
S715:
Automatic-record-muting
switch
(Q
AUTO
REC
MUTE).
¢
S716:
Timer
switch
in
“off”
position
({
TIMER).
°$717
:
Calibration
selector
switch
(REC
CAL).
sf
¢S718:
Open/close
switch
(A
OPEN/CLOSE).
S719:
Power
switch
in
“on”
position
(POWER
#
standby
6
=
ON).
e
$720
:
Monitor
switch
(MONITOR).
Cc
¢
S791:
Motor
switch
in
“off”
position.
(Loading)
¢
$792:
Open
switch
in
“off”
position.
(Loading)
©
$971:
Mode
switch
in
“off”
position.
¢S972:
Cassette
half
detection
switch
in
“off”
position.
¢
S973
:
ATS
(CrO,)
switch
in
“off”
positon.
¢
S975
:
Rec.
inhibit
switch
in
“off”
position.
¢
S976:
ATS
(Metal)
switch
in
“off”
position.
¢
Resistance
are
in
ohms
(),
1/4
watt
unless
specified
otherwise.
4K=1,000 (Q), 1M=1,000k (Q)
¢
Capacity
are
in
micro-farads
(uF)
unless
specified
otherwise.
¢
All
voltage
values
shown
in
circuitry
are
under
no
signal
condition
and
D
playback
mode
with
volume
control
at
minimum
position
otherwise
specified.
(
\eceeeuet
Voltage
values
at
record
mode.
For measurement us EVM.
¢ Important safety notice
Components
identified
by
AV
mark
have
special
characteristics
important for safety.
When
replacing
any
of
these
components,
use
only
manufacturer’s
specified parts
o(
+B
>a
)
indicates
+B
(bias).
o(
am m<
—B>mmmmm
)
indicates
—B
(bias).
©
(<ooonsenendye)
Indicates
the
flow
of
the
playback
signal.
PLAYBACK HEAD
CrOz/Metal :0.5V
CRcen—- 3
Lé
0.033
C36 «6RSB
0.018 3.9K
C34
R60 56K
Gi)-—40)
ov
@)
R56 3.3K
C44
0.022 2.7mH
AC BIAS AC BIAS
TRAP
ADJ.
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ADy.(Rehics
a
10V100
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7
TEST
POINT
—
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|
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3
5
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RECORD HEAD
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POINT
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TEST
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SUPPLY
CIRCUIT
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RS
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|
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(8.2)
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(GC)
area.
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=o
wu
<<
*
(==>)
indicates
the
flow
of
the
record
signal.
s,
*
The
supply
part
number
is
described
alone
in
the
replacement
parts
list.
Ses
$5
8
3x
nev
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Part
No.
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Caution
!
ee
a
|
|
0601
~
606.614
joe4
RE06A
“13.20
ary
Ree
!
IC
and
LSI
are
sensitive
to
static
electricity.
iG}
46}
+
723%,
Anges
609
Secondary
trouble
can
be
prevented
by
taking
care
during
ie
-
Av6i4
erereren
i
288
ISSTEFTA
oa
au
repair.
Pacuwi
hl
STABILIZER
LL
*
Cover
the
parts
boxes
made
of
plastics
with
aluminum
foil.
EES
G)}—©)
*
cN2P
602
Q603 Q604
Q605
Q606
Q607
Q608
oe
ace
weren
.
ZECsSliAaSTA
ZSD2037EFTA
ZSRISSTEFTA
—GEDRORTErTA
sSoeaiar™’
feaearon
eauaror
*
Put
a
conductive
mat
on
the
work
table.
:
REGULATOR
REGULATOR
REGULATOR
*
Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
Ellrower
Sp
oniaes
—
23
—
—
26
— 24—