Technics SH-9020 - Page 5

Schematic
Diagram
...
Model
SH-9020
Notes:
1. S1(L)(R): Input 1 switch in ‘‘push (ON)”’ position.
2. S2(L)(R): Input 2 switch in ‘‘OFF” position.
3. S3(L)(R): Input 3 switch in “OFF” position.
S1, 2 and 3 switches are interlocked with each
other; if one is pushed in, the other will return
outward auto-matically.
4. S4(L)(R): Meter sensitivity selector switch in ‘‘0dB”’ po-
sition.
HEOdB=— .=+20dB
5. $5-1~ $5-5: Mode switch in ‘‘peak’’ position.
(1) peak hold-+(2) peak=+(3) average
6. S6(L)(R): Input 3 (speaker) impedance selector switch in
60." position.
(1) 8QN++(2) 6N-++(3) 40
Te OF: Power source switch in “OFF” position.
8.
S8:
Voltage
selector
switch
in
‘‘240V"
position.
(1) 110V-++(2) 120V-—-(3) 220V—-(4) 240V
= BLOCK DIAGRAM OF L.C.
(SVINJM4558DS or SVINJM4558DG)
m@ BLOCK DIAGRAM
FULL WAVE RECTIFICATION CIRCUIT(IC201)
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jEMITTER
{FOLLOWER
(SENSITIVITY)
(INPUT 1) (INPUT 2) (INPUT 3)
ON ($1) OFF ($2) OFF (S53) +20dB
10.
Th
___} Indicated voltage values are the standard values for
the unit measured by the DC electronic circuit tester (high
impedance) with the chassis taken as standard, There-
fore, there may exist some errors in the voltage values,
depending onthe internal impedance of the DC circuit
tester.
» Marks are signal line.
This schematic diagram may be modified at any time with
the development of new technology.
m POWER SOURCE OF PRODUCTS
FOR ENGLAND (XE)
LOGARITHM AMPLIFIER (1C203)
THERMAL
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5 COMPENSATION
do eae
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| (MODE)
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LEFT CH.
INPUT
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| BUFFER (IC205)
i agers :
I |
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100K av )
RIGHT CHANNEL (as same as Left channel)
[6] SH-9020
0) D—G) O PEAK HOLD HOLD METER METER
CIRCUIT AMPLIFIER DRIVE ON, Pans
rel! I |
© , RELAY ‘
POWER
MUTING
nen CIRCUIT
TRANSFORMER
8 REGULATOR RECTIFIER 8 @
7
EE
SH-9020
TR201, 202
2SC 1327
TR203, 204
2SA798
R24! IK
R217 R2i9 TR203
SUP10511C
ag eee
IN THROUGH OUT.
R225 _ 10K R245 |50K
R2it 47K
INPUT
VR205 10K
R229 390 R227 3.3K
aD
nN re")
R243 IK
C205 |6V47
+
R249 IK
R20!i 220K
R297 10K
Onm SM!
R207 lOOK SS 7
q
D204 R218 R220
_—
INPUT
=
-
Ril4 Rtle
CN
1C201, 202
SUP10511A :
a
SVINJM4558DG
TR30
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2SA7
TR3O1 TR303, 305, 306
2SC1567 2SC1327 x
oe)
~ =
N m
TP15 a =
Y pd
2
R312 ISK
x 8 ‘9 g
a G+ f x [2.2] a o+
ee ® N m va
e3 ge] 8 oe ay
ar
a
vo
°
m9
o
oO
2|
38
©
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TR3Q2
TR304
0301~
304,308
n>
=
y
eilree s 3, 2SA794 2SA721 SVDIOE
ry a ow L\}
: ia ee D307
:
3
{
SVDEQA01C
a
SH-9020