Sony XM-1902GX User manual

1
SERVICE MANUAL
US Model
XM-1502SX/1902GX
Canadian Model
AEP Model
UK Model
E Model
XM-1502SX
XM-1502SX/1902GX
STEREO POWER AMPLIFIER
Other Specifications
Circuit system OTL (output transformerless) circuit
Pulse power supply
Inputs RCA pin jacks
High level input connector
Outputs Speaker terminals
Through out pin jacks
Speaker impedance 2 – 8 Ω(stereo) (XM-1502SX)
1.3 – 8 Ω(stereo) (XM-1902GX)
4 – 8 Ω(when used as a bridging amplifier)
Maximum outputs 300 W ×2 (at 4 Ω)
760 W (monaural) at 4 Ω
Rated outputs (supply voltage at 14.4 V)
150 W ×2 (20 Hz – 20 kHz, 0.04% THD,
at 4 Ω)
190 W ×2 (20 Hz – 20 kHz, 0.1% THD,
at 2 Ω)
190 W ×2 (20 Hz – 20 kHz, 0.1% THD,
at 1.3 Ω) (XM-1902GX)
380 W ×1 (20 Hz – 20 kHz, 0.1% THD,
at 4 Ω) (XM-1902GX)
380 W (monaural) (20 Hz – 20 kHz, 0.1% THD,
at 4 Ω) (XM-1502SX)
Frequency response 5 Hz – 100 kHz ( dB)
Harmonic distortion 0.005% or less (at 1 kHz, 4 Ω)
Input level adjustment range
0.2 – 6.0 V (RCA pin jacks)
0.4 – 12.0 V (High level input)
High-pass filter 50 – 300 Hz, –12 dB/oct
Low-pass filter 50 – 300 Hz, –12 dB/oct
Low boost 0 – 10 dB (40 Hz)
Phase shift adjustment range (XM-1902GX)
0° – 180° (at 40 Hz)
Power supply voltage 10.5 – 16 V
Current drain at rated output : 40 A (at 4 Ω)
Remote input : 2 mA
Dimensions Approx. 358 ×50 ×264 mm
(14 1/8 ×2 1/4 ×10 1/2 in.)
(w/h/d) not incl. projecting parts and controls
Mass Approx. 3.5 kg (7 lb. 11 oz.) not incl. accessories
Supplied accessories Mounting screws (4)
Design and specifications are subject to change without
notice.
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
150 watts per channel minimum continuous average power into
4 ohms, both channels driven from 20 Hz to 20 kHz with no more
than 0.04% total harmonic distortion per Car Audio Ad Hoc
Committee standards.
+0.5
–3
Photo: XM-1902GX
Ver 1.1 2001.06
9-870-239-12
2001F0400-1
© 2001.6
Sony Corporation
e Vehicle Company
Shinagawa Tec Service Manual Production Group
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

2
TABLE OF CONTENTS
1. GENERAL
Location and Function of Controls.......................................... 3
Connections ............................................................................. 3
2. DISASSEMBLY
2-1. Plate, Bottom....................................................................... 6
2-2. Main Board ......................................................................... 6
2-3. Front Panel .......................................................................... 7
2-4. Led Board ............................................................................ 7
3. ELECTRICAL ADJUSTMENT...................................... 8
4. DIAGRAMS
4-1. Block Diagram .................................................................... 9
4-2. Printed Wiring Boards –Main Section– ............................ 11
4-3. Schematic Diagram –Main Section (1/2)– ........................ 12
4-4. Schematic Diagram –Main Section (2/2)– ........................ 13
5. EXPLODED VIEWS
5-1. Heat Sink Section .............................................................. 14
5-2. Main Board Section .......................................................... 14
6. ELECTRICAL PARTS LIST......................................... 15
Notes on Chip Component Replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

3
SECTION 1
GENERAL This section is extracted
from instruction manual.
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

4
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

5
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

6
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. PLATE, BOTTOM
2-2. MAIN BOARD
1BTP 3x6
5plate, bottom
7sheet, insulating
6
2BTP 3x6
3BTP 3x6
4P 2.6x2.8
1BTP 3x6 8CN808
6
2BTP 3x6
3B.TT. 3x14 4B.TT. 3x14
5B.TT. 3x14
7MAIN board section
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

7
2-3. FRONT PANEL
2-4. LED BOARD
1BTP 3x6
2LED board
heat sink (main
)
1P 3x8
2P 3x8
3panel (2ch), front
4MAIN board
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

8
Bias Adjustment
Note : In Bias Adjustment, adjust RV105 if any of Q108 through
Q113 are replaced. Adjust RV205 if any of Q208 through
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°C.
Setting :
SECTION 3
ELECTRICAL ADJUSTMENT
– MAIN BOARD (COMPONENT SIDE) –
RV105
BIAS ADJUSTMENT
RV205
BIAS ADJUSTMENT
Procedure :
1. Turn the variable resistors RV105 (L-CH) and RV205 (R-CH)
full clockwise as seen from the component side to minimize the
bias current.
2. The input signal is to be no signal.
3. Apply the voltage to the B+ and REM terminals from the stabi-
lized power supply and gradually increase it up to 14.4 V while
checking for any unusual current.
4. For the XM-1502SX, adjust each of RV105 (L-CH) and RV205
(R-CH) so that the power current of the stabilized power supply
is increased in steps of 500 mA (total of 1 A). For the XM-
1902GX, adjust each of RV105 (L-CH) and RV205 (R-CH) so
that the power current is increased in steps of 600 mA (total of
1.2 A).
5. After adjustment, check that the power current is at 1.3 to 2.0 A.
Adjustment Location : Main board (component side)
Stabilized
Power suppy
B+,REM terminal
set
GND termina
l
Ver 1.1 2001.06
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

99
XM-1502SX/1902GX
4-1. BLOCK DIAGRAM
SECTION 4
DIAGRAMS
3
216
57 5 7 2 1 6 7
PRE AMP
IC101(1/2) PRE AMP
IC101(2/2)
5
673
21
LOW BOOST
IC104(2/2) LINE AMP
IC104(1/2)
H.L.F
IC102(2/2)
L.P.F
IC102(1/2)
L.P.F
IC103(2/2)
DIFFERENTIAL
AMP
Q103
POWER
AMP
Q108,110,112
OVER CURRENT
DET
Q114-116
DRIVE
AMP
Q105
DIFFERENTIAL
AMP
Q104
POWER
AMP
Q109,111,113
DRIVE
AMP
Q106
BIAS
Q107
LEVEL
SHIFT
Q101
LEVEL
FILTER
S801-1
LPF
OFF
HPF
LEVEL
RV103-1
LOW
BOOST
+14.2V
(B+)
-14.2V
(B–)
CNJ801-1
INPUT
RV101-1
FILTER
XM-1902GX
RV801-1
FILTER
RV801-2
FILTER
OUTPUT
(THROUGH)
OUTPUT
(THROUGH)
L
SPEAKER
OUT
L
SPEAKER
OUT
R
RV104-1
LINE
SWITCH
Q102
REM
12V
GND
2
3
10
4
16
57 5 7 2 1 2 1
PRE AMP
IC201(1/2) PRE AMP
IC201(2/2)
5
673
21
LOW BOOST
IC204(1/2) LINE AMP
IC204(2/2)
H.P.F
IC202(2/2)
L.P.F
IC202(1/2)
L.P.F
IC103(1/2)
DIFFERENTIAL
AMP
Q203
POWER
AMP
Q208,210,212
OVER CURRENT
DET
Q214-216
DRIVE
AMP
Q205
DIFFERENTIAL
AMP
Q204
POWER
ON/OFF
Q903
LINE SWITCH
CONTROL
Q801,802
POWER
AMP
Q209,211,213
DRIVE
AMP
Q206
BIAS
Q207
LEVEL
SHIFT
Q201
RV103-2
LOW
BOOST
+14.2V
(B+)
-14.2V
(B–)
CNJ801-2
CNJ803
INPUT
RV101-2
FILTER
RV801-3
FILTER
RV801-4
FILTER
R
L
HI LEVEL
INPUT
R
RV104-2
LINE
SWITCH
Q202
RV205
BIAS
RV105
BIAS
DC OFFSET
DET
Q803-805
15
16
1
2
14
12
B+
SWITCH
Q901,902
TEMP.DET
TH801
THP802,803
DC DET
IC901
REF.
REG
LED DRIVE
Q813
LED DRIVE
Q809
PROTECT LATCH
Q812
LED DRIVE
Q811
CN802
CN801 F901
DECT
D909
DECT
D905
DECT
D907
DECT
D906
DECT
D911,917
DECT
D908
DECT
D910
+53V
(B+)
+51V
(B+)
+53V
(B+)
-51V
(B–)
-51V
(B–)
-53V
(B–)
-14.2V
(B–)
-20.3V
(B–)
+14.2V
(B+)
+20.3V
(B+)
INVERTER
Q904,905
INVERTER
Q906,907
HI-CURRENT
/HI-VOLTAGE
DET
IC903,Q912
B+
REG
Q910
B+
REG
Q911
DRIVER
Q908
DRIVER
Q909
11
9
8
3
+14.2V
(B+)
+14.2V
(B+)
D811
THERMAL
D810
OFFSET
D809
OVER
CURRENT
D808
POWER
+20.3V
(B+)
-20.3V
(B–)
D922
D919
D920
D921
DECT
D912,918
DC-DC
CONVERTER
TRANSFORMER
T901
+14.2B
(B+)
-14.2B
(B–)
S301
TEST TONE
TEST TONE
GENERATOR
IC301(2/2)
TEST TONE
GENERATOR
IC301(1/2)
D301
D302
DC-DC CONVERTER
IC901
Q808
D808 D807
• Signal path
: AUDIO
CN804
CN805
1
2
1
2
04
1
2
1
PROTECT LATCH
Q810
XM-1902GX FILTER
S801-2
LPF
OFF
HPF
(Q110,111,115:XM-1902GX)
(Q210,211,215:XM-1902GX)
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com

10 10
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•2: nonflammable resistor.
•U: B+ Line.
•V: B– Line.
• Powervoltageisdc14.4Vand fed with regulated dc power
supply from +12V and REMOTE terminals.
• Voltage is dc with respect to ground under no-signal
condition.
• Voltagesaretakenwith a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F: AUDIO
for printed wiring boards:
Note:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
• IC Block Diagram
IC901 µPC494GS
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
OSC
REF. REG.
ERROR
ERROR
0.1V
IC902 F-9
IC903 A-10
Q101 F-4
Q102 E-7
Q103 F-9
Q104 F-9
Q105 E-10
Q106 E-10
Q107 G-11
Q108 C-11
Q109 D-11
(Q110) E-11
(Q111) F-11
Q112 F-11
Q113 G-11
Q114 C-12
(Q115) D-12
Q116 F-12
Q201 G-4
Q202 E-5
Q203 E-3
Q204 E-4
Q205 E-3
Q206 E-3
Q207 G-1
Q208 C-1
Q209 D-1
(Q210) E-1
(Q211) E-1
Q212 F-1
Q213 G-1
Q214 D-1
(Q215) D-1
Q216 F-1
Q801 D-7
Q802 D-7
Q803 B-1
Q804 B-1
Q805 B-1
Q809 A-11
Q810 A-12
Q811 A-11
Q812 B-11
Q813 B-11
Q901 F-10
Q902 F-10
Q903 G-10
Q904 A-8
Q905 A-7
Q906 A-5
Q907 A-6
Q908 A-7
Q909 A-6
Q910 B-2
Q911 B-2
Q912 B-3
D101 E-9
D102 E-9
D103 E-9
D104 E-9
D201 E-4
D202 E-3
D203 E-4
D204 E-4
D301 F-8
D302 G-7
D801 D-7
D802 D-7
D803 B-11
D804 D-12
D805 A-11
D806 D-1
D807 B-11
D820 C-12
D821 D-12
(D822) E-12
(D823) F-12
D824 F-12
D825 G-12
D826 C-1
D827 D-1
(D828) E-1
(D829) F-1
D830 F-1
D831 G-1
D901 G-10
D902 G-10
D905 A-4
D906 A-4
D907 A-9
D908 A-8
D909 D-5
D910 D-5
D911 D-6
D912 D-5
D913 B-2
D914 B-2
D915 B-3
D917 D-6
D918 D-5
D919 D-10
D920 D-10
D921 E-3
D922 E-3
IC101 F-6
IC102 F-5
IC103 F-5
IC104 F-3
IC201 F-6
IC202 G-5
IC204 G-3
IC301 F-8
IC901 B-10
• Semiconductor Location (MAIN SECTION)
Ref. No. Location Ref. No. Location
( ) : XM-1902GX only
• Waveform
IC901 5
11V/DIV, 5µsec/DIV
15µsec
3.4Vp-p
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL [phone] QQ 376315150 892498299 TEL [phone] QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com