Technics RS-B765 - Page 21

Mi SCHEMATIC DIAGRAM
(Parts list on pages 36~38, 44~46.)
(This schematic diagram may be modified at any time with MAIN CIRCUIT
development of new technology.)
Notes: us Es
e $551 : Monitor switch (monitor) in “off” position. a a= z Tse
*S701 : Stop switch (stop) in “off” position. AN Tasik oa t aA
I.
°S702 : F.F. switch (ff) in “off” position. PLAYBACK £0/ esl bes iio
*S703 : Rew switch (rew) in “off” position. a i" gay ff ee
F 1 RI Rib a: ~~
© $704 : Playback switch (Play) in “off” position. 22 comme Oi 1K 25A 1309AQSTA
° S705 : Record switch (rec) in “off” position. sito |B gn twerany MP
RI3
~
¢ $706 : Pause switch (pause) in “off” position. cor ARN ic WN 1 +
*S707 : Dolby noise-reduction switch (Dolby NRC) in “off” position. SO O-O-OO-O-( DD -O_O-O_O_O_-OLO BB t
G °o
*S708
:
Dolby
noise-reduction
switch
(Dolby
NR
B)
in
“off”
position.
on
a
al
|e
RBHBaS
ex
Bt.
eh
=e
° S709 : Multiplex filter switch (MPX filter) in “off” position. B of &8 ae by is eee E] [ese] | eee ig — < 28S "| set 33
©S710 : Timer switch (timer) in “off” position. Eas HH ve pelt i al. me nn ee see] Be
oN : : 9 SSoT
©S711
:
Counter
reset
switch
(counter
reset)
in
“off”
position.
PLAYBACK
HEAD
+HG
fe
eee
ea:
ai
ae,
A
il
P|
ay
mor
a
. re, eS T R = oy
¢S712
:
Counter
mode
switch
(counter
mode)
in
“off”
position.
ig
.
Baz
..
a
a
t
Ne
repo
Leto
4
ay
3
Bou
S713
:
Meter
range
switch
(meter
range)
in
“off”
position.
i
came
or
CHECKING
ri
jute
“Sie
Fs
aM
REC
are
ey
a15
ox MUT. AMP.
*S714 : Memory mode switch (memory repeat) in “off” position. “BF BAS AD) Ae T IT. ale
‘ . ; 2) Sox
*S715 : Memory mode switch (memory stop) in “off” position. ee Yor] Yoves” ov Tov Voney “Sevpv Yoavfov Yov ov YaavJov Tov ov Toasjou 8g
*S716
:
APRS
switch
(APRS)
in
“off”
position.
Lae
se
.
a
2s
.
i
”
¢S717 : Automatic-record-muting switch (auto rec mute) in “off” kevaiass; vate) Re BY esvato | scour ainiag. [eo ald geee ae $3
position.
ri
ce
ia
at:
1
'
ae
(es
°S718 : Power switch (standby /on) in “on” position. Len § cre \ 37, ue ree iat
. . ear 2 : a8 aa
¢ S719 : Open/close switch (open/close) in “off” position. [ rea tir Cas 100 = zt ye a[. oe 7
. a ‘ Sst 23s pot el oX 28 a
$801
:
Motor
switch
in
“off”
position.
(Loading)
Cc
FECOR
BSASAOS
"pha
ee
De
ate
feel
3s]
3
se]
ie
8
ai
:
$s
¢ $802 : Open swtich in “off” position. (Loading) be ea wal amc : ie pad Se es =e Se a] L
S971 : Mode switch in “off” position. : pase ORES ADB Sh 5
*S972 : Cassette half detection switch in “off” position. : a estat [4 ef i
*°S973 : ATS (CrO,) switch in “off” position. ERASE : UPC I297CA are care as BT sob ov gl 57] ee 9305
¢S975
:
Rec
Inhibit
switch
in
“off”
position.
Oerig
ty
ne
em
est
Fagg
|
{2s
:
ags2|
Bgl
ov|—
"7
3
c
-8.6y
2305
2SC3311AQSTA
1P3 6329 sg ng 6 1 87V 82k | 2 0 oe gx 8.4V BIAS OSC CONT.
S976 : ATS (Metal) switch in “off” position. ce ae EET cs —=3 zo OSE 3s oo Se ia ee) TL t
i
:
+e:
3
®
c320
en
oo
as2|6
xc
¢ Resistance are in ohms (Q), 1/4 watt unless specified 8- 0.986 ae a 2SC3311 AQSTA ~.. OV paca sniek 2S/B/IO3ZORSTTAS2 —
= Baur x5 cai! MB218L Music SELECTOR AMP as cae ol Btals| osc CONT.
* : Bo 47P
otherwise. mT As ov Ly wdsevl7 svi rev l¢ ay krovi7 ov]-6.2v | 2° music SELECTOR = area <
10) R322 | 2
= = . g -|~ 13a vew! Ss
1K 1,000 (Q), aM 1,000k (Q) i 7 Ws [ aac LPeaK vCA eras + Q301,302 304 ae Sey Pa Le sev oe
* Capacity are in micro-farads (uF) unless specified otherwise. as 16301. fresul = 2SC3SIIAQSTA 2S DB9ZAQRSTA 9304 10.9 7 z ¢
‘ D a LATOR| MAlgeTA BIAS OSC BIAS OSC CONT. -8.2V CA gx oo
¢
All
voltage
values
shown
in
circuitry
are
under
no
signal
*
285
Pea]
re
aN
“ale
5
seetngousl,
Y
8s
condition
and
playback
mode
with
volume
control
at
minimum
La
ar
Sa
i
ae
Dave
es
heal
ipas
a
ae
3
)
Tgehe
:
position
otherwise
specified.
nt
jv
Frziv
Fav
a
-7.8v
[6.4V
]-7.9V
]-7.9V]-
eV
Q303
=
lee
iw
“se
:
( ) .ssseWOltage values at record mode. preetcLsReetiece as ates 1 Soe Bl * peak MICE fee 2 ss 38 essere 8a 738
= _ |_| = “ — Q- ay De x |S breed 2 =
For measurement us EVM. a aa 2/®) TT | BST ee igo, 308 7 -svl | 30s ‘ ray] > |. zs hie “le |”
* Important safety notice Re gay Fse a 2 . 258621 ARSTA 83a ss. 33| 272 5 :
b fae BS 28 xsiaxl-~| fer ! | —+ | 438 oe $3sije Siz exbd= >
Components identified by A mark have special characteristics Pal laleeoee trgee. BET Gs om ee Bop aed che eae pezv)™ |e (Re * Emo ee “
important for safety. When replacing any of these vera Fequeney l= fy = oa
components,
use
only
manufacturer's
specified
parts.
—
TS
tep).ared
°(
ememe<
+
B
Dee
)
indicates
+B
(bias).
i
1<
87}
°( seem<-B8>seae ) indicates —B (bias). E Bae ra ie yoke ee EE Ve
o( ) indicates the flow of the playback signal eiccrindioe teaeee (AO ee 2 £ = issu
; We tof | of 2 5 G60 10. 5v Q604 awe 139 Vewi
*(
==>
)
indicates
the
flow
of
the
record
signal.
A
raat
ei
38
epee
+
SO
aa
Eo
ae
pa
eal
3a
Pea
3
+
is:
By)
eset”
aes
ele
pga
9.2V
gg
eta
rh
aoe
5
_
* Caution! n oe qe ee a7 vay. Cee) . Bot NY, 9925) bitte 25% lo2v
a uv 580" ok rhs Ss = = : Qgi6
IC and LSI are sensitive to static electricity. ac 1N Alceo! Cae 33 P38 wy aro oe JOY 58 aoe = rN
© gx £ ox 10 Se or
Secondary trouble can be prevented by taking care during repair. at ezonacenens pep ot El oes, S88 asort [ Be 228 wasoseniy fe 2} __rigau ge oa
* Cover the parts boxes made of plastics with aluminum foil. (es sree) 7 Sheth 38 heah ze eT A. se) PE | ae De08E a Fase Waa 20NTA } ut gh? 7 aot eev)
$
si
an
fon:
aX
To
ux
Liaw
*
o>
i
oe
bos
o>
ase
‘
* Ground the soldering iron. 3] laelas] <@tasl | 2s yea ese Aevecian C2] chy S lesat Sap ces Sat |B aestp| /eebeesse | are &
*
Put
a
conductive
mat
on
the
work
table.
3
[a8
sh
7
See2
$x
eave
Bem
28°F
Lew
see
STABILIZER
at
is
a
BS Fay os 2eo5 On - VBS =
*
Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
1
gel
<el
sine
e*
owen
i
*ieeerwa6Orl--cee)
|
= Q602 (FP Ase05; 19 ay At 27 172W --(P, PC, E,E6 ,E6
F Koei 1 (-9. 3) ellis CEB
i 1 | iN Q607
1SR35200T
B
wi
ri
T
\
2SB
1357EFT,
2SB62I1ARSTA
|
- REGULATOR, ; as
9.91 pees alt 7 5 i
mL wees (EB) area/ i 7 /
aso! 602, 603 r 7 rae rise 4 roo --+ 260.606, 608 O78
FAre4o}'5 '/2W--(P, TF” Reeq |CEB) «=f Rees | (EB) =f rezs }(EB) | réze {CEB f 7 CEB) 2SD2037EFT 2SB1030 RST
2SA
1309
AQSTA
BSCSIIAGSTA
|
Teg
|
resents!
TY
fore,
|
EQ
ore,
|
TE.
doves,
|
GB
love
SS!
Sr
Sate
CAPSTAN
MOTOR
ao Weck os es Sey (Ee Oe) beet bee CONTROL
=
A=
G
—
22
—