Sony XM-SD22X Service Manual ▷ View online
9
XM-SD22X
2-4. LED BOARD
3
LED board
2
bracket (LED)
heat sink (main)
1
three
screws
(+
P
3
x 8)
10
XM-SD22X
SECTION 3
ELECTRICAL ADJUSTMENT
Stabilized
Power supply
B+, REM terminal
set
GND terminal
— MAIN BOARD (CONDUCTOR SIDE) —
RV103
BIAS ADJUSTMENT
(L-CH)
RV203
BIAS ADJUSTMENT
(R-CH)
Bias Adjustment
Note : In Bias Adjustment, adjust RV103 if any of Q108 through
Q113 are replaced. Adjust RV203 if any of Q208 through
Q213 are replaced.
Q213 are replaced.
Condition : This adjustment should be performed about one minute
after the remote mode is turned on at a room tempera-
ture of about 25
ture of about 25
°
C.
Setting :
Procedure :
1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)
1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)
full clockwise as seen from the component side to minimize the
bias current.
bias current.
2. The input signal is to be no signal.
3. Apply the voltage to the B+ and REM terminals from the stabi-
3. Apply the voltage to the B+ and REM terminals from the stabi-
lized power supply and gradually increase it up to 12.0 V while
checking for any unusual current.
checking for any unusual current.
4. Adjust each of RV103 (L-CH) and RV203 (R-CH) so that the
power current of the stabilized power supply is increased in steps
of 700 mA (total of 1.4 A).
of 700 mA (total of 1.4 A).
5. After adjustment, check that the power current is at 1.65 to 2.05 A.
Adjustment Location : Main board (component side)
11
11
XM-SD22X
XM-SD22X
4-1. BLOCK DIAGRAM
SECTION 4
DIAGRAMS
6
5
7
3
2
1
PRE AMP
IC101 (1/2)
PRE AMP
IC102 (1/2)
3
2
L.P.F
IC301
5
6
7
LOW BOOST
IC102 (2/2)
DIFFERENTIAL
AMP
Q103
POWER
AMP
Q108,Q110,Q112
OVER CURRENT
DET
Q114
DRIVE
AMP
Q105
DIFFERENTIAL
AMP
Q104
POWER
AMP
Q109,Q111,Q113
DRIVE
AMP
Q106
BIAS
Q107
BOOST
EQUALIZER
Q101
FILTER
S801-1
OFF
LPF
RV102-1
LOW
BOOST
(40Hz)
+16.7V
(B+)
–16.7V
(B-)
CNJ801-1,-3
INPUT
OUTPUT
(THROUGH)
OUTPUT
(THROUGH)
L
(BTL)
SPEAKER OUT
L
R
LINE
SWITCH
Q102
REM
+12V
GND
PROTECTOR
3
2
10
1
3
2
1
PRE AMP
IC101 (2/2)
PRE AMP
IC202 (1/2)
5
6
7
LOW BOOST
IC202 (2/2)
DIFFERENTIAL
AMP
Q203
POWER
AMP
Q208,Q210,Q212
OVER CURRENT
DET
Q214
DRIVE
AMP
Q205
DIFFERENTIAL
AMP
Q204
POWER
ON/OFF
Q903
LINE SWITCH
CONTROL
Q701,702
POWER
AMP
Q209,Q211,Q213
DRIVE
AMP
Q206
BIAS
Q207
BOOST
EQUALIZER
Q201
RV102-2
LOW
BOOST
(40Hz)
+16.7V
(B+)
–16.7V
(B-)
CNJ801-2,-4
CNJ803
INPUT
R
L
HIGH LEVEL
INPUT
R
LINE
SWITCH
Q202
RV203
BIAS
RV103
BIAS
DC OFFSET
DET
Q802,Q803,Q804
15
16
1
2
14
12
B+
SWITCH
Q901,Q902
TEMP.DET
Q809
TH801,803,808
PTH801
DC DET
IC902
REF.
REG
REG
PROTECT LATCH
Q801,Q805,Q806
Q801,Q805,Q806
HI-VOLTAGE
DET
IC903,Q920
CN801
F902
RECT
D911,917
RECT
D909
D909
RECT
D905
D905
RECT
D910
D910
+16.7V
(B+)
+54V
(B+)
+45V
(B+)
RECT
D906
D906
-45V
(B-)
–54V
(B–)
–16.7V
(B–)
SWITCHING
DRIVER
Q904,Q905,Q906
SWITCHING
DRIVER
Q907,Q908,Q909
DRIVER
Q910
SWITCHING
Q913
SWITCHING
Q912
11
9
8
D854
D919
D920
DC-DC
CONVERTER
TRANSFORMER
T901
DC-DC CONVERTER
IC901
D803
D820,822,827,832
+45V
(B+)
-45V
(B-)
• Signal path
: AUDIO
: AUDIO
CN804
BTL
BTL
CN805
1
2
1
2
2
3
INV. AMP
IC302 (2/2)
5
7
L.P.F
IC302 (1/2)
RV301-1
FILTER
RV101-1
LEVEL
RV101-2
LEVEL
RV301-2
FILTER
F901
FILTER
S801-2
OFF
LPF
-1
-3
-4
-2
DRIVER
Q911
B-REG
Q915
B+REG
Q914
L
1
RECT
D912,918
1
D850,852
(POWER)
D851,853
(POWER)
12
12
XM-SD22X
XM-SD22X
IC B/D
C211
C212
TH803
TH808
PTH801
C806
R211
R210
C104
R104
C109
C110
R109
RV101
R108
C103
R103
R106
C108
R107
C130
R101
R102
C101
R154
C131
C231
C221
R254
C106
C105
R105
C107
C102
R206
C207
R207
C208
R205
C201
R202
C230
R201
C202
C209
R209
R208
C204
R204
C203
R203
C205
C222
C206
C210
L901
L903
C914
C915
C805
R809
R811
R810
CN810
C804
R812
R818
R903
C908
R902
R901
IC901
R938
R939
R941
R942
R940
R310
R309
C305
C304
R308
R307
R306
R305
C302
R302
RV301
C303
R120
R110
R111
C112
C111
R220
R909
R907
R913
R908
R906
C911
C912
C913
R912
R911
R910
S801
R301
R820
R828
R823
R821
R833
R844
R905
C907
R904
C909
Q901
D902
CNJ801
CN803
IC302(1/2)
IC302(2/2)
RV301
S801
RV101
CN801
C902
CNJ801
IC301
TH801
R834
Q920
F902
F901
Q806
Q805
Q809
Q903
Q902
D850
D852
D853
D851
D854
R853
R857
JR800
IC101(1/2)
IC101(2/2)
IC202(1/2)
IC102(1/2)
R819
R815
R835
D803
D820
IC902
IC903
D915
D901
CN852
R850
R851
R856
R854
C301
R304
R303
D832
D827
D822
4-2. SCHEMATIC DIAGRAM — MAIN SECTION (1/2) — • Refer to page 15 for Waveform and IC Block Diagram.
(Page 13)
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
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