Technics SH-8065 - Schematic Diagram - Section A; Power Supply and Control Circuits; Band Level Control Circuit

SH-8065
| | SCH EMATIC DIAG RAM (A) (This schematic diagram may be modified at any time with the development of new technology.)
Notes:
* The part No. of transistors, 1C and diodes mentioned in schematic diagram stand
for production Part No.
Regarding the Part No. without o mark, the production Part No. are different
from the replacement part No.
Therefore, when placing an order for replacement parts, please use the Part No.
in the replacement parts list. A
a
2.
11.
12.
13.
14.
$1-1~S$1-3 : Tape monitor switch in ‘‘source”’ position.
source =—=tape
$2-1 ~ $2-7 : Equalization - position selector switch in ‘‘source”’ position.
source rec out
$3-1 ~ $3-6 : Characteristics selector switch in ‘‘normal’’ position.
normal —=reverce
S4-1 ~ $4-6 : Variable - range selector switch in ‘+ 12 dB” position.
4+ 12dB=~+ 3 dB
$5-1 ~$5-5 : Equalization switch in ‘‘on”’ position.
S6-1 ~ S6-4 : Signal level selector switch in ‘‘low level’’ position.
low level (150mV)=—=high level (1V) B
$7 : Power switch in ‘‘on” position.
s8 : Voltage selector switch in ’220V"’ position
110V+=—120V~= 220V =~ 240V
S3-6 and S4-6 are muting switches for changeover.
These switches momentarily turns on the relay off.
The circuit is same for both L and R channels.
For the resistance value and Capacity of R channel Op amp. (1C102), refer
to the L channel (1C101).
(__Jindicated voltage values are the standare values for the unit measured
by the DC electronic circuit tester (high-impedance) with the chassis taken
as standard. Therefore, there may exist some errors in the voltage values,
depending on the internal impedance of the DC circuit tester. c
ignal lines of left channel.
wus Positive ( B) voltage lines. mmmm— Negative (© 8B) voltage lines
Important safety notice:
Components identified by Amark have special characteristics important for safety.
When replacing any of these components, use only manufacturer’s specified parts.
1 2 3 4 5 6 7
e Power Supply, Equalizer Selector, BPF Buffer, Operation Amplifier and Band Level Control Circuit
INPUT OUTPUT REC OUT ~— PLAY BACK REC/PLAY
L oR L oR L oR L oR
Power Supply
Circuit _
= se osc c:
Sh-1~S6-4: Re
fs | 4 «|<
S61 3-2 SIGNAL LEVEL SELECT 2
os o¢ o_¢ low level —-— high level
low——high — low——high
ct
Lo
_
C44 25V100
C63 25V100
+
SUPK 460A
1C101, 102
SVINJM2043DD
BUFF/OP
C62 K0.047
MUTING SWITCH
(EQ POSITION)
!
—S2-3
o
L—Se-5
:
a
S
(TAPE MON) 5
Si-1
(VARIABLE RANGE)
od 0 S4-1
OSITION = |
ee
)
&
S4-3
peaSo-4 +{24B—— +308
|
| 6 S4-2
Livesey +12dB—-—t30B
(TAPE
ON)
O
S4-4
1-2 Qo © 8 ee eo oS S3 ti2dB——3d8
am aw [ay
[=== oc :
SOUTCE—~—-—
Tape
CHARACTERISTICS
swt
=
—
tape
ieee
Re
J
be
sf
mee
a
oO
S45
S1-3 $2-7 $3- 7 t(2dB——+3dB
SUPK 460B SUPK 4600
APLI~ PL4
RANGE LIGHT
D5,7.9,11
LN
824WP
(8v
015A)
Dé, 8,10 LN 424WP
(Sounce)(tape) (source)(rec out) (normal)(reverse) /EQ) +348 +12dB
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