Technics SU-X920D User manual

-
Stereo Integrated Amplifier
ORDER NO. AD9203073A2
Service
Manual
Amplifier
SU-X920D
Colour
(Ke a eens Black Type |
Areas
Suffix for
Model No. | Area Colour
(E) Europe
(EB) Great Britain (K)
(EG) Germany and Italy
Please
file
and
use
this
manual
together
with
the
Service
Manual
for
Model
No.
SU-X902,
Order
No.
AD9103052C2.
eThis
service
manual
indicates
the
main
differences
between
Original
SU-X902
(E).
@
LINE-UP
OF
COMPONENTS
SC-X920D (EB) }
| RS-X920 (EB)
: Cassette Deck
SL-PJ38A (EB)
:_CD Player (Made in MBV)
SL- “OB EE
: Turntable
SB-CS95 (E
- Speaker (Made in PAES) _
SC-X920D (EF)
ST-X902LA ( es
: Tuner (Made in PFS)
SU-X920D (E)
: Amplifier
SL-J110R (E
SB-CS95 (E
ST-X902LA ( a
SU-X920D (EB)
RS-X920 (E)
: Cassette Deck
Technics
SL-PJ38A (E) : CD Player (Made in MBV)
SL-J110R(E) —_: Turntable _
SB-CS95(E) _:_ Speaker (Made inPAES) _
SC-X920D (El)
RS-X920 (EG)
System
Name
Unit
|
System
Name
;
__Unit
ST-X902LA
(E)
_:
Tuner
|
ST-X902LA(EG)
:
Tuner
SU-
ae
:
Amplifier
|
SU-X920D
(EG):
Amplifier
SC-X920D
(E)
RS-X920
(E
:
Cassette
Deck
_
|
SC-X920D
(EG)
RS-X920
(EG)
-
Cassette
Deck
J
:
CD
Player
|
|
SL-PJ3B8A
(EG):
CD
Player
(Made
in
MBV)
_
:
Turntable
SL-J110R
(EG)
—:
Turntable
;
:
Speaker
(Made
in
PAES)
==
_|
SB-CS95(E)
tS
Speaker
(Made
in
PAES)
:
Tuner
-
“ST-X902LA
(El)
|
:
Tuner
(Made
in
PES)
a
Amplifier
SU-X920D
(EG)
:
Amplifier
: Cassette Deck
SL-PJ38A (EG)
: CD Player (Made in MBV) 4
SL-J110R (EG)
> Turntable
_|_SB-CS95(E)
- Speaker (Made in PAES) _|

SU-X902 (Pages 34~39, 42 of service manual.)
CHANGES
@ CHANGE IN REPLACEMENT PARTS LIST
i
Part Number
Ret. No. ‘SU-X920D Description Remarks
SU-X902 (E) (E, EB, EG)
TRANSFORMER(S)
r 1 [ RTP1P5E004-W SLT5P268-W POWER TRANSFORMER 2 (EB)
| JACK(S)
[____Jk902 [ 83893338 | $JS93328 AC OUTLET | 4 (EB)
CAPACITORS
f C709 ECEAIHKA2R2B | ECEATHKN2R2B CAPACITOR 50 V 2.2u
[CABINET PARTS
3 SJP9205-2Y $JP9205-2T [ SHORTING PIN
RGRO1050-A REAR PANEL “[E) Type (A)
RGRO105C-E2 REAR PANEL (E) Type (B)
RGRO105P-A REAR PANEL (EB) Type (A)
: GROTOSC A RGRO105B-C2 REAR PANEL (EB) Type(B}
RGRO1050-B REAR PANEL (EG) Type (A)
RGRO105C-F2 | REAR PANEL (EG) Type (8)
11 RMAO138 RMA0136-1 PLATE
13 FGLOO94-X RGLO094-c PANEL LIGHT
21 AGUOATAAK
24 $JS9333A $JS9332A AC OUTLET COVER (EB)
REMO0020-1 FAN MOTOR ASS'Y Type (A)
i SYE 11282 SYE1128-4 | FAN MOTOR ASS'Y Type (B)
28-1 = SHE232-1 | FAN Type (A)
RMQ0209-K FAN CASE Type (A)
26s Suser SHE233-1 (FAN CASE Type (B)
28-5 SHE234 RMQ0208-K CAP Type (A)
= SJT783 TERMINAL Type (B)
28-7 — | suss215 CONNECTOR (2P) Type (B)
28-8 [= — RMQ0212-K TERMINAL CAP
35 RFKGUX902E-K RFKGUX920DEK FRONT PANEL ASS'Y
40 a RJS1A7402 T CONNECTOR (2P) Type (A)
41 a XTBS3+8JFZ1 | SCREW Type (A)
PACKING MATERIALS
Pt RPGO841 RPG1205 | PACKING CASE i i
P3 SPSD152 — | ACCESSORIES BOX
ACCESSORIES |
i Al ROF1096 — T INSTRUCTIONS MANUAL ASS'Y ()
RQT1494-B | INSTRUCTIONS MANUAL (EB)
| At REKSUX502E-K RQT1493-D ~ TINSTRUCTIONS MANUAL (EG) |
| RFKSCX520DEK INSTRUCTIONS MANUAL €)
i A2 SJA187 —_ | AC POWER SUPPLY CORD 4.(E) |

SU-X920D SU-X920D
@
CONNECTIONS
OF
EACH
UNIT
.
There
are
two
types
of
the
fan
motor,
i.e:
Types
A
and
B.
Type A... The fan motor terminal is a connector type.
The “mark ®"” is printed on the main P.C.B. of type A. (Refer to the diagram below.)
Connection diagrams shown are for connections to a
ey
REMOTE; Turntable Technics histi component system. : Type B...The fan motor terminal is a lead wire type.
SYNCHR
Make:
conriactions:in
the
numbered
sequential
order
‘
Refer
to
the
diagram
below
to
distinguish
type
A
from
type
B.
a
Connect
the
stereo
connection
cables
r
(included
with
the
turntabie,
tuner,
stereo
sound
pro-
Type
(A)
Type
(B)
cessor, and cassette tape deck),
Stereo connection cable
Rear Panet
Rear Panel
‘1-1
wey
“GND” terminal of the amplifier
This terminal is for use with a turntable which has a
ground wire.
1-2 :
Fan
Motor
Ass'y
Fan
Motor
Ass'y
Connection Via
Lead Wires
Connector
“EXT” terminals of the amplifier
When these terminals are not in use, be sure to in-
sert the “shorting” pins (included).
OUT
EXT
iN
Direct Connection
Via Connector
Main P.C.B.
Connector
Main P.C.B.
Shorting pins
Screw
[2] Connect the L-type cable (included with the
turntable, tuner, stereo sound processor, compact
disc player, and cassette tape deck),
(2-4) (Side View) (Side View)
“REMOTE OUT” terminal é
This terminal is used to connect to the “REMOTE
IN” terminal of the Technics multi-compact disc
player (not included). Main
221 P.C.B.
“CONTROL” terminal
Make a connection from this terminal to the “CON-
TROL” terminal tor a cassette deck on a Technics
multi compact disc player.
(For detailed information, refer to the operating in-
structions of the Technics multi compact disc
player.)
[3]
Connect
the
optical-tiber
cable
(included
Rear
Panel
Rear
Panel
with
the compact
disc
player),
(34)
(Top
View)
(Top
View)
“DIGITAL IN”
(CD,
DAT)
terminals
of
iz
the amplifier :
These terminals are protected by the dust-protec-
tion caps to avoid damage by the dust, etc.
Remove the caps only when the “DIGITAL IN" ter-
minais are to be used.
When these terminals are not being used, attach the
caps as shown in the illustration below.
Stereo sound
rocess:
P The mark @®
is printed.
Bs
ee Motor )
Ass'y
LINE OUT® <
"f DIGITAL
iT
OUT out
Dust-protection
cap
22 @ Connect the AC power supply cords and
AC outlet
See page 3 of service manual RS-X920, Order No.
AD9203069A2.

| SU-X920D
SU-X920D |
m
DISASSEMBLY
INSTRUCTIONS
Fat
Ne:
Peat
of
the
Fan
Motor
Ass’y
<=
i
a
Procedure
138-14
Hole SS
‘ Fan Case Terminal Cap
Projection .
1.
Release
the
3
claws.
(See
Fig.
1.)
(Fig.
4)
2.
insert
a
screwdriver
at
the
root of
the
fan. Force
it
out
of
(Fig.
6)
NS
the motor shaft. (See Fig. 2.)
3.
Remove
the
cap
by
using
©
screwdriver.
(See
Fig.
3.)
a
\
4.
Remove
the
terminal
cap
in
the
direction
of
arrow.
Motor
I.
A
(See
Fig.
4.)
%
i
\r
)
5.
Remove
the
motor
from
the
fan
case.
(See
Fig.
5.)
I)
a
6.
When
mounting
the
motor,
align
the fan
casing's
we
}
projection
with
the
hole
of
the
motor.
(See
Fig.
6.)
Fan
Case
(Fig. 5)
Procedure
1-814
4 es : 4
(Fig. 1) ae | Fan Case
Projection
i (Fig. 5) (Fig. 4)
1. Remove the 1 connector (J551). 3. Insert a screwdriver at the root of the cooling fan.
2. Release the 3 claws. (See Fig. 1.) Force it out of the motor shaft. (See Fig. 2.)
. Remove the cap by using © screwdriver. (See Fig. 3.)
. Remove the motor trom the tan casing. (See Fig. 4.)
. When mounting the motor fan, align the fan casing’s
projection with the hole of the motor. (See Fig. 5.)
NM
m@
CABINET
PARTS
LOCATION
(Type A)
(Type B)
Note:
The
different
parts
between
type
A
and
type
B
are
enciosed
by
the
dot
lines
in
the
above
diagrams.
Printed in Japan
F920311500FF/YU/TN

SU-X902
m@ CONTENTS
Page
Circuit board diagram 2.2... 26... eee ee eee rece 22~27
Termiani guide of IC's, transistors and diodes ...........-...- 27
Wiring connection diagram ........ 6.2.6 e cece ee eter eee 28
Function of IC terminais ........... 02 eee eee eee ee eee 29, 30
j
Block
diagram
2.66...
eee
eee
31~33
Digitalization
of
audio
signals
Replacement
parts
list
.....
34~39,
42
Disassembly
instructions
oe
‘
Cabinet
parts
location
.....
Ling
Sb
ds
dee
Beaten
sinaes
40,41
Schematic
diagram
.....
ee
we
a
Packaging
0.0.00...
6.6
e
cece
e
eee
eter
n
een
e
ert
en
eee
42
Description of FL panel
@ BEFORE REPAIR
(1)
tod
off
the
power
supply.
Using
a
100,
5
W
resistor
connect
both
ends
of
power
supply
capacitors
(C711,
C712,
3300
pF)
in
order
to
discharge
the
voltage.
(2)
Before
turning
the
power
supply
on,
after
completion
of
repair,
slowly
apply
the
primary
voltage
by
using
a
power
supply
voltage
controller
to
make
sure
that
the
consumed
current
at
50
Hz/60
Hz
in
NO
SIGNAL
mode
should
be
shown
below
with
respect
to
supply
voltage
220
V/240
V.
Power
supply
voltage
AC
240
V
Consumed
current
50
Hz
198~463
mA
186~434
mA
Consumed current 60 Hz
181~422 mA
m@ PROTECTION CIRCUITRY
The protection circuitry may have operated if either of the following conditions is noticed:
*No sound is heard when the power is switched ON.
*Sound stops during a performance.
The
function
of
this
circuitry
is
to
prevent
circuitry
damage
if,
for
example,
the
postive
and
negative
speaker
connection
wires
are
“shorted”,
or
if
speaker
systems with an impedance less than the indicated rated impedance of this unit are used.
If this occurs, follow the procedure outlined below:
1. Switch OFF the power.
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again.
Note:
When
the
protection
circuitry
functions,
the
unit
will
not
operate
unless
the
power
is
first
switched
OFF
and
then
ON
AGAIN.
m
ACCESSORIES
@AC power supply Cord 2.0... eect eet 1
Configuration of AC power supply cord differs according to area.
SJA187 ... For (E) (EG) area only
SJA188........55 For (EB) area only.
@
LOCATION
OF
CONTROLS
[1]
Power
switch
(POWER)
[2]
Speaker
selectors
(SPEAKERS)
[3]
Muting
indicator
(MUTING)
{4]
Volume-level
indicator
(VOLUME
LEVEL)
[5]
Volume
control
(VOLUME)
[6]
Sampling
frequency
indicators
(SAMPLING
FREQUENCY)
Surround-sound
button/indicator
(SURROUND)
Tone
controls
(BASS/TREBLE)
[9]
Balance
control
(BALANCE)
Volume
preset
button
(VOLUME
PRESET)
[ii]
Input
selectors/indicators
Super
bass
level
control
buttons/indicators
(SUPER
BASS
LEVEL)
[13]
Super
dynamic
sound
button/indicator
(S.
DYNAMIC
SOUND)
Super
bass
button/indicator
(SUPER
BASS)
Headphones
jack
(PHONES)
Active
current
sensor
switch
Phono
input
terminal
Tape
rec
out/playback
terminal
Tuner
input
terminal
[20] CD input terminal
DAT recout terminal
VCR
recout/playback
terminal
[3]
EXT
output/input
terminal
(24)
VDP
input
terminal
[25] MONITOR terminal
[26]
System
control
IN/OUT
terminal
Control
terminal
(to
turntable)
GND terminal
VCR out/in terminal
[30] Cooling fan
Bi]
Surround-sound
speaker
terminal
32]
Main
speaker
A
terminal
[33]
Main
speaker
B
terminal
[4]
CD
digital
input
terminal
[35]
DAT
digital
input
terminal
[36]
AUX
digital
input
terminal
AC
outlet
AC iniet

SU-X902
m@ CONNECTIONS
2,
conniegions
ta
each
component
the
systetn
by
using
tered:
connection
cable
(not
included)
See the operating instructions of the tuner (ST-X902L) for details.
Stereo connection cabie
White (L)
Red (R) =
CONTROL
[SYSTEM CONTROL IN| [SYSTEM CONTROL OUT}
Connecting audio components
Connect a stereo sound processor.
Stereo sound processor
(not included)
LUNE IN
LINE OUT ©
Note:
When these terminalis are not in use,
be sure to insert the “shorting” pins
(included).
Mi “SYSTEM CONTROL OUT” terminal
This terminal is used to connect a Technics tape deck with the
“SYSTEM CONTROL IN” terminal.
“PHONO” terminals Sat
Connect a turntable.
® i)
is
OUTPUT
INPUT
“Shorting” pins
© (“TUNER™ terminals ~~
Connect a tuner.
Turntabie
(not
included)
Tuner
{not
included)
AS TCS LE SARE
Y g : ait
®@
H
7
0
—
Hi “GND” termina!
This terminal is for use with a turntable which has a ground wire.
Mi “SYSTEM CONTROL IN” terminal
This
terminal
is
used
to
connect
a
Technics
tuner
with
the
“SYSTEM
CONTROL
OUT”
terminal.
@ “CONTROL” terminal
This terminal is used to connect a Technics turntable with the
“REMOTE/SYNCHRO REC" terminal.
SU-X902
Make
connections
to
each
component
by
using
stereo
connection
cables
(not
included)
and
video
connection
cables
(not
included).
VCR (not included)
AUDIO IN AUDIO OUT
input outrut LO
woeo @ = Rg e
R) (O(RALYVIDEO)(VIDEO) (VIDEO)(VIDEO) (ROR
Connect a TV.
MONI-
TOR ©)
TV (not included)
© (_<vpp” terminats
Connect a video disc player.
vor a i
{
RM
vo
(VIDEO)
®
&
(video)
4
4
4
3
eeeenene
A
Video disc player (not included)
AUDIO OUT VIDEO OUT
RG @t ©
let (“AC OUTLE
Do
not
connect
video
equipment
(such
as
a
TV,
etc.)
to
the
AC
outlet
of
this
unit.
(This
outlet
is
intended
for
audio
equipment.)
Do
not
exceed
the
indicated
power
ratings
when
connecting
to
this
outlet.
“UNSWITCHED” outlet:
Power
is
always
available,
regardless
of
power
switch.
Audio
equipment
rated
up
to
60
W
can
be
connected
here.
Note:
The
configuration
of
the
AC
outlet
differs
according
to
area.
AC power supply cord
Connect
the
AC
power
supply
cord
(included)
after
all
other
cables and cords are connected.
Notes:
Configuration
of
the
AC
outlet
and
AC
power
supply
cord
differs
according
to
area.
¢
If
this
unit
is
not
to
be
connected
with
the
tuner,
the
cord
is
to
be
connected
to
the
househoid
AC
outlet.
Tuner (not included)
[
|
AC power supply cord
(inctuded)
This unit
(eS)
For
United
Kingdom—————
plug.
Household AC outlet
Cut
off
and
dispose
of
the
plug
and
replace
with
a
suitable
;

SU-x902. |
Connect a digital audio tape deck.
Recordings
can
be
made
to
the
digital
audio
tape
deck.
Digita! audio tape deck
{not included)
Optical-fiber cable (not included)
©) ( “Aux” terminal (DIGITAL)
Connect a second compact disc player, etc.
Second compact disc player
(not included)
COAXIAL
C) out
Q
Coaxial cable (not included)
Connect a compact disc player.
Compact disc player
(not included)
6 Optical-fiber cable (not included) }
©
Cer"
terminals
ANALOG
—~*S
Connect a compact disc player.
Compact disc player
(not included)
Wi
“DIGITAL
INPUT”
(DAT,
CD)
terminals
of
this
unit
These terminals are protected by dust-protection caps to avoid
damage by dust, etc.
Remove the caps only when the “DIGITAL INPUT” terminals are
to be used.
When these terminals are not being used, attach the caps as
shown in the illustration at right.
OPTICAL
C3 our
—
LINE OUT
() @ Qo 9
®
—
0
Dust-protection
cap
[ACTIVE CURRENT SENSOR]
ACTIVE
ON “-CURREN
OFF 30 SENSOR
i SU-X902
SPEAKERS)
\——~ SPEAKERS (8 ~ 16 Q)-——
Connection of speaker systems
Three
pairs
of
speaker
systems
(main,
second,
surround-sound)
can
be
connected
to
this
unit.
Speaker systems that can be connected to any of the speaker
connection
terminals
of
this
unit
are
speaker
systems
with
an
impedance of 8 to 16 ohms.
Make connections to each speaker system by using speaker
cords (not inctuded).
Main speaker systems (not included) |: -
Connect to the “A” terminals.
(right)
Ho OW
Second
speaker
systems
(not
included)
Connect to the “B" terminals.
(right) (left)
Wo Of
Connect to the “SURROUND” terminais.
Be sure to connect both speaker systems. If only one side is
connected, no sound will be heard.
(right)
The selector is used to enjoy powerful super-bass sound.
ON:
Switch
ON
when
connecting
the
Technics
system
speakers
(SU-X902:
SB-CS90,
SU-X502:
SB-CS90/CS70).
OFF:
Switch
OFF
when
connecting
speakers
other
than
Technics system speakers.
Notes:
¢
When
connecting
speakers
other
than
system
speakers,
sound
from
the
speakers
may
not
be
heard
if
the
selector
is
pressed
ON,
because
the
protecting
circuit
on
the
amplifier
becomes
active.
*The
active
current
sensor
activates only
for
the
speaker
systems connected to the “A” terminais.
es
connect
cords
to
terminals
————-——_,
@® Strip off the outer ®
covering, and twist the
center conductor.
SC i———-~_
15mm Twist
@ Tilt the fever back and (19/32")
insert the cord.
5 *
@: Close the lever and pull ice
the cord gentty to be
sure that it is secure.
Note:
Be sure to only connect positive (+) cords to positive
(+) terminals, and negative (—) cords to negative (—)
terminals.
Note:
To prevent damage to circuitry, never
short-circuit the plus (+) and minus (—)
speaker wire.

SU-X902
m@ DIGITALIZATION OF AUDIO SIGNALS
MWhy digitize?
* Audio signals are analog signals with a continuous form.
* When these audio signals are subjected to repeated electronic
processing (recording, playback, etc.), they become noisy and
distortion occurs, thus resulting in deterioration of the sound
quality.
«When these signals are first digitized before processing, they
have the foliowing advantages that prevent deterioration of the
sound quality:
@ Resistance to noise
® Extremety low distortion
® Fiat, even frequency response
Analog signals
Original
sound
Deteriorated
signal
Digital signals
a i >
Even if noise
occurs
SLU
Processed as uniform
series of Os and 1s,
without distortion.
NUL +
Original sound
Digitalization
example
(recording
to
CD
and
play
of
CD)
Recording to CD
Analog signals
XN <>
CD play
Compact disc player
a>} Mb oo |—
Digital/analog conversion
Analog signals
—_—_—_—
Analogidigital conversion TULL
Amplifier
ae
W How signals are digitized
If it is known to what degree of minuteness the human ear can
distinguish sounds, it is then possible, by using that data as the
standard reference, to digitize them by dividing analog signais
into minute pieces, after which they can be transmitted with a
high degree of precision, and thereafter recorded and played
back in the digitized format.
Analog signals are sampled, quantified and encoded.
g
23
os
& & Time
2 Sampling:
3
cy
i
Analog
signals
are
minutely
sub-
as
divided
on
the
lateral
axis.
Es
qs
o |} Quantification:
3 ey = Sampled signals are minutely
é s sub-divided on the vertical axis.
o
>
Digital signals Recorded to CD
"il — =
Digital signals
Speaker systems
econ ee |
Sound deterioration may easily occur because analog signals are
sent to the amplifier through stereo connection cables.
Speaker systems
This method
mpact disc player
_—
sn
Amplifier
Digital/anaiog conversion
+4 1]
Sound deterioration does not easily occur tecause digital
signals are sent to the amplifier through optical-fiber cable.
(| What the sampling frequency is )
The sampling frequency expresses the degree of minuteness to
which signals can be cut, relative to a certain specified time
interval, during sampling.
For compact disc sound:
Analog signals are cut 44,100 times (i.e., 44.1 kHz) during one
second.
This 44.1 kHz is, therefore, the sampling frequency for compact
disc sound.
(| What analog/digital conversion is )
Audio signals (analog signals) are taken out (sampled) at certain
fixed time intervals. The points at which this sampling frequency
occurs are digitally encoded and converted to digital signals.
What digital/analog conversion is )
Each sampling frequency point is returned (converted) to voltage.
thus converting digital signais to the analog signais that we can
hear.
@
DISASSEMBLY
INSTRUCTIONS
| SU-X902
Removal of the Cabinet
Procedure
Ref. No.
1
1. Remove the 6 screws (@~ @)-.
2. Remove the cabinet in the direction of the arrow.
Removal of the Power Switch/Speaker
Select Switch P.C.B.
Ref. No.
3
Procedure
1-2-3
Power switch/Speaker select switch P.C.B
Remove the 2 screws (@, @).
Procedure
Ref. No.
2 Removal of the Front Panel Unit
12
J501
1. Remove the 2 connectors (J501, J502).
—Removal of the Connector—
\ Fiot cable
4 Connector
ef
2. Remove the 3 screws (@~®).
3. Remove the front panel unit in the direction of the arrow.
Ref. No.
4 Removal of FL Drive P.C.B.
Procedure
QO
i 1. Remove the 4 knobs (@~@).
2. Remove the 4 nuts (@~ @)
J63IA
J632A
3. Remove the 3 screws (Q@~ @®).
4. Remove the 3 connectors (J631A, J632A. J633A) i
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2. Release the 4 claws in the direction of the arrow. Pull out the operation buttons and lens.
Ref. No. Removal of the Sampling
7 Frequency Indicator Lens
Procedure
1-247
@Release the 2 claws.
Removal of the Rear Panel
Procedure
18
Procedure
1-9
Release the 4 claws.
~10-

SU-X902
System input/output P.C.B.
Removal of the P.C.B.s
Procedure
® Removal of the D/A converter P.C.B.
1. Remove the screw (@).
2. Remove the D/A converter P.C.B. in the direction of the
arrow.
AUX P.C.B. S
Video input/output
@ Removal of the other P.C.B. P.C.B.
Remove the P.C.B. in the direction of the arrow.
Check of the main P.C.B.
Procedure e
111 |
D/A converter P.C.B.
1. Remove the 7 screws (~@).
5. Remove the bottom chassis.
6. Reinstall the front panel unit to the main P.C.B.
3. Remave the 3 screws (@~@®).
4. Remove the front panei unit in the direction of the arrow.
“Connect 2 flat cables (J501A, J502).
= ft
PANA-05251 / Oruckt
1. Unsolder the power IC or regulator
transistor.
2. Remove the 4 screws (@~Q).
Regulator
When mounting the power IC, or regulator transistor apply
silicon terminat compound (SZZOL15) to the rear of the power
IC or regulator transistor.
1. Remove the 1 connector (J209).
2. Release the 3 claws.
Removal of the Power IC and
Regulator Transistor
Power transformer
1. Remove the 1 flat cable (J701).
2. Remove the 4 screws (Q@~Q).
Projection
Fon motor
3. Insert a screwdriver at the root of the cooling fan.
Force it out of the motor shaft.
. Remove the motor cover by used © screwdriver.
. Remove the motor from the fan casing.
6. When mounting the motor fan, align the fan casing’s
projection with the hole of the fan motor.
ae
Some chassis components may have sharp edges. Be careful when disassembling and servicing.
| ATTENTION SERVICER”
eReplacement of the Foot.
1. Remove the 4 heat melted posts on the chassis with a pair of
nippers or similar tool.
2. To repiace the foot (RKA001 1-2) on the chassis, melt the 4 posts
with a soidering iron.
Removal of the Power Transformer
Heat Melted Posts
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| SU-X902 SU-X902 |
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CIRCUIT
BOARD
DIAGRAM
Notes:
(This
schematic
diagram
may
be
modified
at
any
time
with
the
development
of
new
technology.)
eS501A
_:
Active
current
sensor
switch
in
“OFF”
position.
$501
:
Speaker.ON/OFF
switch.
(eote
SPEAKER
A
in
“ON”
position
S$501-2:
SPEAKER
B
in
“OFF”
position,
$601
:
Tumtable
input
switch.
(PHONO)
$602
:
Tuner
input
switch.
(TUNER)
S603
:
Video
disc
player
input
switch.
(VDP)
S604
:
Tape
deck
input
switch.
(T.
APE)
S605
:
Video
cassette
recorder
input
switch.
(VCR)
S606
:
Digital
AUX
input
switch.
(DIGITAL
AUX)
S607
:
CDinput
switch.
(CD)
S608
:
Digital
audio
tape
deck
input
switch.
(DAT)
eS609
:
Super
dynamic
sound
switch.
(S.
DYNAMIC
SOUND)
eS610
:
Volume
preset
switch.
(VOLUME
PRESET)
eS611
:
Super
bass
switch.
(SUPER
BASS)
0$612
:
Super
bass
level
control
switch.
(SUPER
BASS
LEVEL
A)
eS613
:
Super
bass
level
control
switch.
(SUPER
BASS
LEVEL
Vv)
eS614
-
Surround-sound
switch.
(SURROUND)
$701
:
Power
switch.
(POWER)
zs
CD
signal
(Lch),
Phono
signal
(Lch)
==
Positive
voltage
lines
(+)
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Phase
difference
signal
Recording
signal
eindicated
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.
elmportant 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.
*Caution!
IC
and
LSI
are
sensitive
to
static
electricity.
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
LSI
with
the
fingers
directly.
;
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DESCRIPTION
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| SU-X902 SU-X902 |
9
10
11
12
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POWER SWITCH/HEADPHONES PC.B.
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CURRENT
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SPEAKER
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(Bot
(S501I-1)
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PANA-05251 / Druck10

SU-X902
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CIRCUIT
BOARD
DIAGRAM
1
2
3
4
5 6
7
8
9
10
——_[ SPEAKERS (8~16Q}—____, AKERS (8~I6Q
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MAIN
P.C.B.
SYSTEM
CONTRO
|
CONTROL
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(iN) (OUT) (TO TURNTABLE)
A
(REC OUT) (PLAYBACK)
B
VIDEO IN/OUT
TERMINAL PC.B.
AC
IN/AC
OUTLET
PC.B.
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IN
AC
OUTLET
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EG)
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-25-
-26-
PANA-05251 / Druckt1

11
12 13
| SU-X902
14
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TERMINAL
GUIDE
OF
IC’S,
TRANSISTORS
AND
DIODES
AN6558SFE2
BA4558FDXT1
BA4560FT1
2SA992EFPTA
2SB1187DEF
2SB621AQRSTA
28D1761DEF
2SC3114STUTA
MA4043MTA
MA4047MTA
MA4051LTA
MA4051MTA
PANA-05251 / Drucki2
AN6554NSFE2
2SA1309AQSTA
2SC3311AQSTA
2SC3312RSTA
2SD1450STTA
UN4215TA
Cathode
MA4120MTA
MA4150MTA
a Cathode
a
Anode
-~27-
BU2040F-T2
MC74HCU04FEL
MA165TA
MA167TA
MA7O0TA
1SS291TA
LN473YP-C
LN873RP-C
wote SEO
A
On Cathode
.
Benga
PCM1700U-T1
2SD2144STA
DTA114ESTP
DTC114ESTP
DTC144ESTP
P300DLF
A
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Ca