Technics SU-V90D

lm
SCHEMATIC
DIAGRAM
1
2
3
4 5
6
7
8
9
(This schematic diagram may be modified at any time with the development of new technology.)
EY oicitaL input TERMINAL CIRCUIT
[> :
14. —C?}— Positive voltage lines. Eee bee ae
15. --("}*+ Negative voltage lines. 3 |
16. Indicated voltage values are the standard values for the unit measured by the DC electronic
R849 33K
1. $1 : Power switch in “on” position. A
(Ht off, = on) 1804
2. S2 : Voltage selector in “240 V" position. SVITORX 172 2 : 7 ne
For
(EK),
(XL),
(XA),
(PA)
and
(PC)
areas.
RETICAL
RECEYER
Bob
S¥00
TU
te
[EJ
0/4
converter
CIRCUIT
¢.
3. $101 : Phono selector switch in “MM” position. cone ne cane ee
(2. MM, = MC) aaseeane YM3623B oF
4. $201 : Power amp direct switch in “off” position. sii PROCESSING!
(1 off, = on) OPTICAL 1C806 SUL ty
5. $202 : Digital/analog selector switch in “analog” position. B oe fe 7 Sis es
(HL analog, m digital) ere A
6. $203 : Audio muting switch in “0 dB” position. SECA c bec ae
(MOB, = —20 dB) DIGITAL INPUT SIGNAL TARA hiv
7. $204 : Loudness switch in ‘‘off’’ position. ial
(1 off, m on) |
8. $301 : Tone control switch in ‘‘defeat” position. |
(1 defeat, = on) COAXIAL cers 10 \
9. $501-1 : Speaker select switch in “on” position. i
(1 off, = on) Cc ah |
10. $501-2 : Speaker select switch in “main” position. ne eo,
( main, = remote) cea! 01 Dagon icltigss mall pailcars
11. S701~S706, $708, S709 8 ah ere b
: Input/recording-source selector switch in ‘‘phono” position. : - oS fe 1804 t
$701: phono $702: digital $703: tuner 83 fi
$704: CD $705: aux $706: tape 1 Re24 12k
S708: tape 2/DAT S709: rec mode see jasoz as |+ |
12. $801 : Digital input selector switch in “optical” position. D te [= af) si set $y |
(f optical, m= coaxial) 892, S oY “ Ca) 60.1 |
13,» : Optical signal (Lch). c= : Phono signal (Lch). iz 2 |
\
!
=
'
circuit
tester
(high-
impedance)
with
the
chassis
taken
as
standard.
Therefore,
there
may
an
soi
9803,
805
+
exist
some
errors
in
the
voltage
values,
depending
on
the
internal
impedance
of
the
DC
ERR ae
nea
ae
eal
circuit tester.
17. Important safety notice: E cazs
Components identified by A\ mark have special characteristics important for safety. When
replacing any of these components, use only manufacturer's specified parts.
1cB02 QB02 Q806
MN74HCOO 2SA1309A UN4III
DIGITAL INPUT SELECT SWITCHING CONT. SWITCHING
*Caution! Hess. 860
IC and LSI are sensitive to static electricity. '
Secondary trouble can be prevented by taking care furing repair. ob. ney bigs Eady
*Cover
the
parts
boxes
made
of
plastics
with
aluminum
foil.
Sa
%
“Ground
the
soldering
iron.
F
3
*Put a conductive mat on the work table. s Sov &)
*Do
not
touch
the
legs
of
IC
or
LSI
with
the
fingers
directly.
3
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ee Pht es
te eee 5 vn
ke
MN53010PEH
. SERIAL/PARALLEL
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OIGITAL FILTER 4 " iH W
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Bi (3)
1C814 3 1B
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esti pas ! {ov
H ov UN42 II ae Loe
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ie SWITCHING So \ R847 560 H | (8)
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-11- 722