Technics SU-X955 Service Manual

1 2 3 4 5
m@ SCHEMATIC DIAGRAM
(Parts list on page 27~31)
(This schematic diagram may be modified at any time with the development
1
of
new
technology.)
A
D/A
CONVERTER
CIRCUIT
DEGLITCH/BUFFER
AMP
CIRCUIT
LMa33Me3
Notes:
S201 : CD input selector switch in ‘digital’ position.
$501 : Speaker selector switch in “A” position. to veo
©S601~S607_ : Input selector switches.
$601: Phono, S602 : Tuner, S603 : CD, S604 : Tape 1
$605;
Tape
2,
S606
:
AUX,
S607:
DAT,
fed
er
gevbrv
Lov
©S608 : Audio muting selector switch.
S609
:
Surround
selector
switch.
@a08
aoe
16809
810
ae
eS610 : Super bass switch. sees eSBlos0GRS ees
S700 : Power source switch in ‘‘on”’ position. UN4211TA : 2 REGISTER
SWITCHING won so
{CD/DAT
:ON)
sch
Be
|
Sows
eee
I
8
8
ROR,
OREO
TS
lt
hectare
pete
aft
|
= =
SSRI
«
CD
Phono
signal
line
:
ssa
Recording
signal
actin
a
Phase
difference
signal
mamma
Super
bass
signal
ag
a
se
ais
pon
hf
—
—}
Positive
voitage
line
--(_}--
Negative
voltage
line
Serica
RECCMER
CD signal
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.
Therefore,
there
may
exist
some
errors
in
the
voltage
values,
depending
on
the
internal
impedance
of
the
DC
circuit
tester.
@Important safety notice:
Components
identified
by
4\
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
R851
Al/2 270
bn
DIGITAL
=
§
manufacturer's
specified
parts.
INPUT
C802
ecctantnanpe
ss ae
eeetnatisennd
3
88
&
os
(C803
©
*Caution!
TC74HCUO4AF
re
:
io
NVERTER
IC
and
LSI
are
sensitive
to
static
electricity.
—
DAT
icell
TC7T4HCOOAF
NAND GATE
Secondary trouble can be prevented by taking care furing repair.
“Cover the parts boxes made of plastics with aluminum foil.
*Ground the soldering iron.
“Put a conductive mat on the work table.
“Do
not
touch
the
legs
of
IC
or
LS!
with
the
fingers
directly.
ar
sacentnanetii
ate
aie:
ilk
1
1C 807, 808
PCMS6P-L
D/A CONVERTER
TC74HC4053AF
SWITCHING
(INPUT SELECT)
@ DESCRIPTION OF FL PANEL
1C805
YM3623B
eGRID
ASSIGNMENT
DIGITAL
SIGNAL
1
On 8 x =!
pei
lees
ase
Ssh
=
JULI»
; : 2V/2p sec. div
<
|
t
as
'
5
C808!
3
VG
Spee
div
aes
ay
38
a
ov
@
©
eviGSpsec
a
Vv
I
9
:
8
eM
1806
—
os
as
YM3404B
a8 cf ee t DIGITAL FILTER
TF
600
mv
s
2W/OSpsec div : 355 Sey
#
Sy:
ae
i
a
1V/0.2
usec.
div
—
he
\
x32
Onde 9 woo R810 470 = XC =
PIN
TION
ey]
:
;
ee
CONNESTIC
DIGITAL
SIGNAL
te
ae
sat
se
ionatae
25A|309AQSTA
PROCESSING AND SELECTOR 25v4.7 ! SWITCHING
eeoeee
TACRGRRRAR
CIRCUIT
Saat
av/o2usee
ti
DIGITAL
FILTER
CIRCUIT
7
i
aE
F
aie
-12-

Technics SU-X955 Specifications

General

Brand	Technics
Model	SU-X955
Category	Amplifier
Language	English