Technics RS-BX606 - Schematic Diagram; Main, Power Supply, and Power Switch Circuits

RS-BX606 RS-BX606
1 2 3 4 5 6 7
Hi SCHEMATIC DIAGRAM (Parts list on pages 32~35.)
(This schematic diagram may be modified at any time with
development of new technology.)
Notes:
A
E¥
main
circuit
¢ $701: Stop
switch
(Mf
STOP).
Th
¢ S702:
Fast-forward
switch
>P>).
ig
ch
&
©
$703
:
Rewind
switch
(<q
[Trs).
LINE
OUT
¢
S704:
Playback
switch
(B®
PLAY).
[
¢ S705:
Record
switch
(@
REC).
Rech
¢ S706:
Pause
switch
(#9
PAUSE).
ap
ace
¢ S707
:
Dolby
noise-reduction
switch
(Dolby
NR;
C).
LINE
IN
e S708
:
Dolby
noise-reduction
switch
(Dolby
NR;
B).
Reon
¢
$709:
Multiplex
filter
switch
(MPX
FILTER).
¢
S710: Counter
reset
switch
(COUNTER
RESET).
e $711: Counter
mode
switch
(COUNTER
MODE).
B
¢S712:
Meter-range
selector
switch
(METER
RANGE).
¢ S713
:
Memory
mode
switch
(MEMORY
REPEAT/STOP).
¢
$715: Automaitc-record-muting
switch
(Q
AUTO
REC
MUTE).
¢ $716:
Timer
switch
in
“off”
position
({]
TIMER).
PLAYBACK
HEAD:
¢$S719:
Power
switch
in
“on”
position
(PP
area:
POWER/ m
OFF
=
ON,
Le
chee
Others
areas:
POWER
/@
standby
¢)
=
ON).
O—e)—9
¢ $720:
Monitor
switch
(MONITOR).
¢
S971:
Mode
switch
in
“off”
position.
Len
=<
TRAPADUL..
7hGiBIAS
e $972:
Cassette
half
detection
switch
in
“off”
position.
(R
ch)
Teorey.
Tt
Me
¢
$973
:
ATS
(CrO,)
switch
in
“off”
positon.
a
eee
all
ah
Seer
eae
° S975
:
Rec.
inhibit
switch
in
“off”
position.
c
Bich
<T
Ye
tor
+
ithe
¢ $976: ATS
(Metal)
switch
in
“off”
position.
t
coon
e
Resistance
are
in
ohms
(Q),
1/4
watt
unless
specified
otherwise.
ft
4
i...
alae!
weap
253
HK
PAO
ADL.
ct
I
1K=1,000 (Q),
1M=1,000k
(Q)
ERASE
OF
\Gor
TEST POINT
(L
ch)
-
:
© Capacity are in micro-farads (uF) unless specified otherwise. HEAD
e All voltage values shown in circuitry are under no signal condition and
playback mode with volume control at minimum position otherwise
specified.
( Veseecces Voltage values at record mode.
For measurement us EVM.
¢ Important safety notice
Components identified by AV mark have special characteristics
important for safety. D
When replacing any of these components, use only manufacturer’s
specified parts
¢( _«<— +B >see ) indicates +B (bias).
¢( mee ee< —B >a ee ) indicates —B (bias).
«a) indicates the flow of the playback signal.
* (<=>) indicates the flow of the record signal.
e The supply part number is described alone in the replacement parts list.
Production Part No. Supply Part No.
1C2, 701,
702, 901,
902, 903
1€203 SN74LS74AMEL SN74LS74AM
* 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 aluminum foil.
*
Ground
the
soldering
iron.
sok
*
Put
a
conductive
mat
on
the
work
table.
<
*
Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
F
sa
=D-ail
C45 I6VIO
623 10V1I000
c3
C47, 0.01
HI
150 6.3 100
R3
Qi~4
2SC331IAQSTA
REC EQ
(X2/ Cr02/METAL)
R43
PLAYBACK/
REC AMP
C37 0.047
C27
50V0.33 6.8K
Ic
; AN7351K
28
Ic2
PLAYBACK
40 R54
012 150
Rw, °
> 3 ne
ov ov ov
38 -0.8V CH=" CH-24"
as 106 Q4
0303
= 2SD2037EFTA
301, 302 Ye OS08 ta BIAS OSC CONT.
2SC33IIAQSTA @, (8.4V) 9903 0913~ 915]
BIAS OSC <a -8.3V KSBSG64ACYGTA | MAlesTA
-8.3V bd Q903 BIAS OSC CONT.
L6
Q5,6
2SAIZ309AQSTA
REC EQ
(X2 /Cr02/METAL)
C34 0.033
R6O 5.6K
c44
0.022 2.7mH
ov
CH -0.8V
Q2
560K
c4
6.3V100
97,8
2SC331IAQSTA
(X2/Cr02/METAL)
HX PRO ADJ. VR (Leh)
C305
2200P
W-
R3ii 18K
+
R464 680K | R463 680K
D302 MTZJSRECTA
(4)
—
C307 S800P
1
10
308 3900P
R310 R309
ABSO |) PEAK
DET. [| DET.
. 4V ]-7.4v ]-3.6V ]-7.5V ],-8¥ 76.4v ~8.1V [- 6.3V
R318 33 (-6.8vi] = (Z2v)
I
Bs
SST
ast6
cstBk
<
+———
Q451~454
We
;
°]
Ae
q
2SC3311AQSTA
2SC331|AQSTA
MPX CONTROL.
DTCII4ESTP | 81s osc conT.
SWITCHING
R312 18K
R320 8.2K
—wv—
ee
R319 1K
\
OVERALL FREQUENCY Ne
238 as BELL CO RECUENGY HX PRO ADJ. TEST POINT (Rch)
UPCI297CA eee
DOLBY HX PRO MAISSTA
OVERALL FREQUENCY
RESPONSE ADJ. (Lich)
& These are the parts)
When these parts a
Thus it does not ni
M5218AL M5218L
reiz, \Q605 uLev)
5.2] HSV
Nd
a
Ce
R929 6.8K
bx
ay 0607,608 BX
MAIG5STA
®
7
© D909,910
Wa MAIGSTA
a
R928 12K’
cae pa
TEST TERMINAL
c602
6800P
DEOI~ 606,614
S' &
“13.4V . ~2UV i eee
1SR35200TB Sed SeACie Aer 26.61Q606
Aoei4a 601 2SBI3S57EFTA
2SAIZ09AQSTA ERASE CURRENT CONT.
lh STABILIZER cee |
( 120V 60Hz ----{PP] )
230-240V S0/60Hz--{EB.EG).
ae
]
2 n
a
o
|
Metin aa Se Q602 04
9603 a6 605 Q606 Q607 Q608
2SC33IIAQSTA 2SD2037EFTA 2SBIS57EFTA 2SD2037EF TA KSB5S64ACYGTA 2SC331IAQSTA 2SAI309AQSTA
STABILIZER REGULATOR REGULATOR REGULATOR REGULATOR REGULATOR REGULATOR
|B | POWER SUPPLY CIRCUIT
POWER
A G — 20—