Technics RS-M228X - Page 21

RS-M228X
RS-M228X
1 3 4 5 6 1 8
= R932
SCHEMATIC DIAGRAM aici url :
SECTION Q302
480K R328 220 oo 2330 2spess
o% : [2SC945-Q]
Q301 aN 1C302
[2SB641] Van CH oi ees ES = I {AN6552]
-9.954 :, 1 eta os.” Ota
Q201 Q203 Q207, 213, 209 Q211, 215 1¢201 221 1¢203 Q219, 217 cata ra poe Oo ees are oa
dbx SECTION 2SK104H —1C205 2SC945(P,Q) 2SD1010(R,S) 2SD1010(R,S) [UPC1252H2] 2SC945(P,Q) [UPC1253H2} 1C205 2SD1010(R,S) D302 revid 10K () sat scaas 0.05y) & | 0.03V
[2SK104]
[NJM4558DF]
[2SC945-Q]
[28D1010]
[25D
1010]
[28C945-Q]
INjM4558DF]
[2SD1010]
1289
gut
NS
hs
[28C945-Q}
3
ue,
7
CTaayy
° . ee ee © < . [MA161] 2 aan | a geese Tee
R324
10K
oltey
D303—306
e
ie
-
D201 Cai REC MUTE) [ ¥ 0307 “482473 _
182473177
Gleov
217
-
oy
4
4
(MA161]
[MA161]
=)
°
sv@
3k
peel
e 201 oO1V ee R307 1M 3 —~_D307 D305 0306
0201 AOV) RD20EB3T
CD
Sore,
OR
IC201
aol
R30!
Ieee
EQUIVALENT
ov ov! : Gr —G A s6v0A1. 27K ‘can
1 HO’ CoE
© 201 heer | Ach ne > ipast3el CIRCUITS
AD eal SE out 1301 «RCH IN GEES
Foci wer 1 _. 1BAG138) 21K O-D)
<
)
OA
GEOG:
ow?
6
|
2.03v
1C301
BA6138
[| Py T ocav 7) osov Ra04. |
y a “1 (0.04V) . 7 (0.63V) 220K:
| Lelanh, Bee aud
i) |
[| Keath] MAIN a Stvsatosa R308 1M
TOMAIN
|
ch
in
r
CIRCUIT
82D
ov
circuit |? BOARD ~10.5V 6)
BOARD herd
Encode
(H)
Jo.ssy
® (
&
DecodecH)
sak
R304
i)
D301
FL
METER
rH]
bine
eav
182473
4
0308
2333
IMAIG]
|
180
Q205
2SD1010(R,S)
28999
[2SD1010)
ae
[2SB641]
[AN6870N} _
1 1059V- 15 | CIp atv D308
pote eds 7
| 2 BOR 16 io aty, [AIG]
10.09V 10.40V
° [3 aotow. 17 1-t0.41V)
4 o77V 18 PN
5 -o78v 19 /10-40V
:
Fe
dine
Sat
buoy
PEMD
18 erodaw 2 10.41) Say
7 wt9.42y 21: 1840, [Brey | 1€303 (ANG870N]
“8 -10.42V 22 ey | OODOOOD-OM
"9 -1042v 23, 10-40 | eee [|
i [10 (3434, 24 -seov
11 1082W) 28 Bays
12 | 1o4ay), 2 | ~8-40V cong
13 -1041V 27 (8'88y) 0 L
en 10.42v 28. BBey)
ac av (
e
MAIN
J
els
NOTES:
me
R202 e VR201, 202 ...... VCA symmetry adjustment VR.
scan
©
VR203,
204
......
RMS
detector
adjustment
VR.
1C303
AN6870N
¢ VR205, 206 ...... dbx standard level adjustment VR (Encode).
bg
¢
VR207,
208
......
dbx
standard
level
adjustment
VR
(Decode).
ous
H
TO
MAIN
Rch
in
¢
VR301
....
FL
meter
adjustment
VR
(-40dB
indication).
CIRCUIT |® * VR302 .... FL meter adjustment VR (0dB indication). -) V Reg
BOARD
e
Resistance
are
in
ohms
(2),
1/4
watt
unless
specified
otherwise.
Chi
GATE
1K = 1,000(2), 1M = 1,000K(2). @ Foote @ our a
* Capacity are in microfarads (uF) unless specified otherwise. = apes \+18dB)
P
=
Pico-farads.
Ch
2
H
—
1
@
outs
¢ The mark (¥) shows test point. e.g. W=test point 1. vy) i proof oe T (+12dB)
.
¢
All
voltage
values
shown
in
circuitry
are
under
no
signal
condition
and
008
}
aay
d)
ouTC
record
mode
with
volume
control
at
minimum
position
otherwise
specified.
Ady
aks
Hrcofare|
J
OuT
i)
Aes
(1)
eee
Voltage
value
at
playback
mode.
®
j
pal
ecaad
}
* Voltage values shown in dbx SECTION. PP oY pavfart | out | —~8 our >
E
C204
vr204
NO
MARK
......
Voltage
values
at
REC/dbx
Tape
(NR
select
switch)
mode.
AceEr
aw
;
,
a5
3
Roe
BrDSY
SoKaS
©
K
B—106V
(
Vteraen
date
Voltage
values
at
PLAY/dbx
Tape
(NR
select
switch)
mode.
&
RESETE——
7
'
‘
'
pee
C226
C228
b
as
For
measurement,
use
VTVM.
ieee
:
‘
:
‘
fc
mM
r
7
o(
)
indicates
the
flow
of
the
playback
signal
(dbx
out).
om
:
4
5 . 01 j i aay : OuT!
7
Ps
©
~®
bee
Fe
3
°(
)
indicates
the
flow
of
the
playback
signal
(dbx
tape).
ghey
>
Houofar
®
(—40B)
4
.
dicates
the
flow
of
the
recording
signal
(dbx
out).
nt
© 2D 0 re (pe ) in g sig ® (sro ovr]
Re © (mapper ) indicates the flow of the recording signal (dbx tape). (cn. 2 [Jeri ouT > pea kare out 0) eA
R252 ness O—O=O) “On no: * Described in the schematic diagram are two types of numbers; the supply OUT G2 1 ; :
1k
aa
242
1610
4
parts
number
and
production
parts
number
for
transistors
and
diodes.
:
‘
One type of number is used for supply parts number and production parts Sync ‘ $
eee number when they are identical. me | CONT OUTO
|
2SC1844(E,F)<t—
Production
parts
number
ouTP
. e es é % < [2SC1844E]~«— Supply parts number l (—244B)
Osc
D202
a206
10206
Q204
208,
210,
214
Q212,
216
dpe
1c204
1206
Q218,
220
pele
;
Y
()
outa
12473177:
2SD1010(R,S)
[NJM4558DF]
2SC945(P,Q)
2SD1010(R,S)
2SD1010(R,S)
[UPC1253H2]
[NJM4558DF]
2SD1010(R,S)
182473177
«Production
parts
number
ue
\—30d8)
F
[MA161]
[2SD1010]
[2SC945-Q]
[2SD1010]
[2SD1010)
Q222
[2SD1010]
(MA161]~<«————-
Supply
parts
numbers
GND
Q202 2SD636(R,S) * The supply parts number is described alone in the replacement parts list. ® ©) OUTR
2SK104H [2SD636] (— 4068)
[2SK104]
¢ This schematic diagram may be modified at any time
with the development of new technology. — 30 —
B+ 10.53V
NOTES:
¢ The circuit shown in
the back side of the prin
¢ Values indicated in[_ J
NO MARK. ......Voltage
( Sn eae Voltage
For measurement use V
¢ This circuit board
with the developm
1C301
[BA6138
ov | 6
0.02V
2 | @o4av) | 7”
0.61V
3 | @eavy | §
[4 | 2.03v | 9
5 OV
1C302
[AN6552
—7.54V
1 | E149vy| ®
0.03V
2 | o5vy| §
3 0.03V
(0.05 V)
4 | -10.53v | 8