Technics SU-V2X - Schematic Diagrams: Speaker Selection and Power Amplifier; Speaker Selector Circuit Schematic; Power Amplifier and ICQ Control Schematic

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This
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uses
2
types
of
power
IC
which
are
different
in
circuit.
For
a
set
using
power
IC (part
No.
SV12003),
refer
to
the
circuit
shown
right
side.
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INDICATOR
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GENERATOR
OR MICRO —
COMPUTOR)
A
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main or remote
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main and remote main and remote
16n Bn
SAFETY OPERATION
7AUTO IND. DRIVE
For F.R. Germany only
SAFETY OPERATION IND.
6G'
COMPUTOR DRIVE IND.
SPEAKER
IMPEDANCE
_] SELECTOR
Mi SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the development of new technology.)
*
A
OVERLOAD DET.
(LEVEL SIF TEI
AC 220V
The part No. of transistors, IC and diodes mentioned in the schematic diagram stand for production part No.
Regarding the part No. with €) mark, the production part No. are different from the replacement part No.
Therefore, when placing an order for replacement part, please use the part No. in the replacement part list.
Notes:
1. $1~S6 :_ Input selector switch in “phono” position.
S1: phono, S2: tuner, S3: CD, S4: video/aux, S5: tape 1/DA tape, S6: tape 2
2. $7 : Recording selector switch in ‘‘off” position.
3. $8 : Audio muting switch in “off” position. (off <> —20dB)
4. $9-1 : Loudness switch in “off” position. (on <> off)
5. $10-1 : Subsonic filter switch in “off” position (on <— off)
6. $10-2. : Tone switch in “defeat” position. (defeat <-> on)
7. $11-1: Main speakers selector switch in “‘on” position. (on <— off)
8. S11-2. : Remote speakers selector switch in “off” position. (on <— off)
9. $12 : Speaker impedance selector switch in “82 ~ 162/162" position.
[ Main or remote 8~16Q ._, Main or remote 4~62
Main and remote 162 Main and remote 82
10. $13 : Power switch in “‘on” position.
. $14 [XA, EK, XL] only : Voltage selector switch in ““240V” position.
(110V <= 120V <-> 240V <> 220V)
12. Important safety notice:
Components identified by A mark have special characteristics important for safety. When replacing any of
these components, use only manufacturer's specified parts.
13. [{~] Indicated voltage values are the standard values for 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. [high tap —» 162/8~ 16Q]
in
(
)
stand
for
DC
voltage
in
low
tap.
[82/4
~
6Q]
Phono signal (Lch).
Positive voltage lines or Negative voltage lines.
. This is the basic circuit diagram (For continental Europe) of this unit. Note that part of the circuit is subject
to change depending on the areas.
. Regarding the circuits to be changed in the basic circuit diagram (For continental Europe) and related areas
[EK], [XL], [XA] refer to the separate service manual (Order No. HAD84072860C8-A).
e
Change
in
the
parts
list
and
schematic
diagram
in
use
of
power
IC
(SV12003)
1c502 Q503,504
ST12003 2SC2631
2CH POWER AMP & CURRENT STABILIZER
PROTECTION DET.
Loch
Speaker
terminal
terminal
(50/60 Hz)
Change of Power Amp. IC Parts No.
For F.R. Germany only STK2038-4 => 8v12003 Part Name & Description
INTEGRATED CIRCUIT
1C502 | STK2038-4 | svi2003 Power Amplifier
TRANSISTORS
Q505,506 | 2SA992 [_Not used
DIODES
D503,504_ | MA167 | Not used
RESISTORS
R527, 528 ERX2ANJR22 Not used
R529, 530 ERDS2TJ331 Not used
R531, 532 ERDS2TJ561 Not used
R533, 534 ERDS2TJ272 Not used
R539, 540 Not used ERD25FJ561 Carbon, 1/4W 5602
R608 Not used ERDS2TJ183 [ Carbon, 1/4W 18kQ
R609, 610 ERDS2TJ183 Not used