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.
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.
2
Page 3
SECTION 1
GENERAL
This section is extracted
from instruction manual.
3
Page 4
456
Page 5
Page 6
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. PLATE, BOTTOM
4 P 2.6x2.8
3 BTP 3x6
6
2 BTP 3x6
1 BTP 3x6
5 plate, bottom
7 sheet, insulating
2-2. MAIN BOARD
2 BTP 3x6
1 BTP 3x6
3 B.TT. 3x14
4 B.TT. 3x14
5 B.TT. 3x14
7 MAIN board section
8 CN808
6
Page 7
2-3. FRONT PANEL
)
4 MAIN board
2 P 3x8
2-4. LED BOARD
1 P 3x8
3 panel (2ch), front
1 BTP 3x6
2 LED board
heat sink (main
7
Page 8
l
Ver 1.1 2001.06
SECTION 3
ELECTRICAL ADJUSTMENT
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 temperature of about 25°C.
Setting :
B+,REM terminal
set
Stabilized
Power suppy
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 stabilized 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 XM1902GX, 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.
GND termina
Adjustment Location : Main board (component side)
– MAIN BOARD (COMPONENT SIDE) –
RV105
BIAS ADJUSTMENT
RV205
BIAS ADJUSTMENT
8
Page 9
3
2
1
6
5
7572167
PRE AMP
IC101(1/2)
PRE AMP
IC101(2/2)
5
6
7
3
2
1
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
1
6
5
7572121
PRE AMP
IC201(1/2)
PRE AMP
IC201(2/2)
5
6
7
3
2
1
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
D808D807
• 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)
XM-1502SX/1902GX
SECTION 4
DIAGRAMS
4-1. BLOCK DIAGRAM
99
Page 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 Ω and 1/
specified.
4
W or less unless otherwise
•%: indicates tolerance.
• 2 : nonflammable resistor.
• U : B+ Line.
• V : B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REMOTE terminals.
• Voltage is dc with respect to ground under no-signal
condition.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
When indicating parts by reference
number, please include the board.
MAINLED
(1902GX)
D8088-719-064-23 LED SEL2411G (POWER)
D8098-719-302-91 LED SEL2111R (OVER CURRENT)
D8108-719-302-91 LED SEL2111R (OFFSET)
D8118-719-302-91 LED SEL2111R (THERMAL)
< TRANSISTOR >
Q8088-729-230-49 TRANSISTOR 2SC2712-YG
< RESISTOR >
R8121-216-041-00 METAL CHIP4705%1/10W
R8131-216-061-00 METAL CHIP3.3K5%1/10W
R8141-216-061-00 METAL CHIP3.3K5%1/10W
R8171-216-061-00 METAL CHIP3.3K5%1/10W
R8181-216-041-00 METAL CHIP4705%1/10W
IC1018-759-385-17 IC NJM4580E(TE2)
IC1028-759-385-17 IC NJM4580E(TE2)
IC1038-759-385-17 IC NJM4580E(TE2)
IC1048-759-385-17 IC NJM4580E(TE2)
IC2018-759-385-17 IC NJM4580E(TE2)
IC2028-759-385-17 IC NJM4580E(TE2)
IC2048-759-385-17 IC NJM4580E(TE2)
IC3018-759-385-17 IC NJM4580E(TE2)
IC9018-759-144-88 IC uPC494GS-T1
Q2058-729-207-89 TRANSISTOR 2SA1358-Y
Q2068-729-207-82 TRANSISTOR 2SC3421-Y
Q2078-729-055-13 TRANSISTOR 2SD1861-TV2
Q2088-729-924-78 FET IRF540
Q2098-729-053-85 FET IRF9540
Q2108-729-924-78 FET IRF540 (1902GX)
Q2118-729-053-85 FET IRF9540 (1902GX)
Q2128-729-924-78 FET IRF540
Q2138-729-053-85 FET IRF9540
Q2148-729-230-49 TRANSISTOR 2SC2712-YG
Q9048-729-053-05 FET FKV550T
Q9058-729-053-05 FET FKV550T
Q9068-729-053-05 FET FKV550T
Q9078-729-053-05 FET FKV550T
Q9088-729-230-49 TRANSISTOR 2SC2712-YG
R1011-216-837-11 METAL CHIP22K5%1/16W
R1021-216-837-11 METAL CHIP22K5%1/16W
R1031-216-837-11 METAL CHIP22K5%1/16W
R1041-216-837-11 METAL CHIP22K5%1/16W
R1051-208-494-61 RES-CHIP2.2K2%1/8W
R1061-216-845-11 METAL CHIP100K5%1/16W
R1071-216-845-11 METAL CHIP100K5%1/16W
R1081-216-025-11 RES-CHIP1005%1/10W
(1902GX)
R1091-216-833-11 METAL CHIP10K5%1/16W
R1101-216-833-11 METAL CHIP10K5%1/16W
R1111-216-833-11 METAL CHIP10K5%1/16W
R1121-216-837-11 METAL CHIP22K5%1/16W
R1131-216-833-11 METAL CHIP10K5%1/16W
R1141-216-833-11 METAL CHIP10K5%1/16W
R1151-216-827-11 METAL CHIP3.3K5%1/16W
R1161-216-831-11 METAL CHIP6.8K5%1/16W
R1171-216-827-11 METAL CHIP3.3K5%1/16W
R1181-216-845-11 METAL CHIP100K5%1/16W
R1191-216-845-11 METAL CHIP100K5%1/16W
R1201-216-845-11 METAL CHIP100K5%1/16W
R1471-220-894-11 METAL0.2210%5WF
(1902GX)
R1481-220-894-11 METAL0.2210%5WF
(1902GX)
R1491-220-894-11 METAL0.2210%5WF
R1501-216-825-11 METAL CHIP2.2K5%1/16W
R1511-216-821-11 METAL CHIP1K5%1/16W
R1521-215-859-00 METAL OXIDE225%1WF
R1531-216-853-11 METAL CHIP470K5%1/16W
R1541-216-065-00 RES-CHIP4.7K5%1/10W
R1551-216-077-00 RES-CHIP15K5%1/10W
R1561-216-833-11 METAL CHIP10K5%1/16W
R1571-220-894-11 METAL0.2210%5WF
R1581-216-825-11 METAL CHIP2.2K5%1/16W
R1591-216-821-11 METAL CHIP1K5%1/16W
R1601-215-859-00 METAL OXIDE225%1WF
R1611-216-017-00 RES-CHIP475%1/10W
(1902GX)
R1621-216-017-00 RES-CHIP475%1/10W
(1902GX)
R1631-216-825-11 METAL CHIP2.2K5%1/16W
(1902GX)
R1641-216-821-11 METAL CHIP1K5%1/16W
(1902GX)
R1651-216-833-11 METAL CHIP10K5%1/16W
R1661-216-833-11 METAL CHIP10K5%1/16W
(1902GX)
R1211-216-843-11 METAL CHIP68K5%1/16W
R1221-216-295-11 SHORT0
R1231-216-827-11 METAL CHIP3.3K5%1/16W
R1241-216-045-00 METAL CHIP6805%1/10W
R1251-216-837-11 METAL CHIP22K5%1/16W
R1261-216-829-11 METAL CHIP4.7K5%1/16W
R1271-216-833-11 METAL CHIP10K5%1/16W
R1281-216-811-11 METAL CHIP1505%1/16W
R1291-216-073-00 METAL CHIP10K5%1/10W
R1301-216-829-11 METAL CHIP4.7K5%1/16W
R1311-216-829-11 METAL CHIP4.7K5%1/16W
R1321-216-829-11 METAL CHIP4.7K5%1/16W
R1331-216-089-11 RES-CHIP47K5%1/10W
R1341-216-089-11 RES-CHIP47K5%1/10W
R1351-216-033-00 METAL CHIP2205%1/10W
R1361-216-839-11 METAL CHIP33K5%1/16W
R1371-216-833-11 METAL CHIP10K5%1/16W
R1381-216-033-00 METAL CHIP2205%1/10W
R1391-216-845-11 METAL CHIP100K5%1/16W
R1401-216-845-11 METAL CHIP100K5%1/16W
R1671-216-017-00 RES-CHIP475%1/10W
R1681-216-017-00 RES-CHIP475%1/10W
R2011-216-837-11 METAL CHIP22K5%1/16W
R2021-216-837-11 METAL CHIP22K5%1/16W
R2031-216-837-11 METAL CHIP22K5%1/16W
R2041-216-837-11 METAL CHIP22K5%1/16W
R2051-208-494-61 RES-CHIP2.2K2%1/8W
R2061-216-845-11 METAL CHIP100K5%1/16W
R2071-216-845-11 METAL CHIP100K5%1/16W
R2081-216-025-11 RES-CHIP1005%1/10W
(1902GX)
R2091-216-833-11 METAL CHIP10K5%1/16W
R2101-216-833-11 METAL CHIP10K5%1/16W
R2111-216-833-11 METAL CHIP10K5%1/16W
R2121-216-837-11 METAL CHIP22K5%1/16W
R2131-216-833-11 METAL CHIP10K5%1/16W
R2141-216-833-11 METAL CHIP10K5%1/16W
R2151-216-827-11 METAL CHIP3.3K5%1/16W
R2161-216-831-11 METAL CHIP6.8K5%1/16W
R2171-216-827-11 METAL CHIP3.3K5%1/16W
R2181-216-845-11 METAL CHIP100K5%1/16W
R2191-216-845-11 METAL CHIP100K5%1/16W
R2201-216-845-11 METAL CHIP100K5%1/16W
R2211-216-843-11 METAL CHIP68K5%1/16W
R2221-216-295-11 SHORT0
R2231-216-827-11 METAL CHIP3.3K5%1/16W
R2251-216-837-11 METAL CHIP22K5%1/16W
R2261-216-829-11 METAL CHIP4.7K5%1/16W
R2271-216-833-11 METAL CHIP10K5%1/16W
R2281-216-811-11 METAL CHIP1505%1/16W
R2291-216-073-00 METAL CHIP10K5%1/10W
R3041-216-833-11 METAL CHIP10K5%1/16W
R3051-216-833-11 METAL CHIP10K5%1/16W
R3061-216-833-11 METAL CHIP10K5%1/16W
R3071-216-833-11 METAL CHIP10K5%1/16W
R3081-216-829-11 METAL CHIP4.7K5%1/16W
R2301-216-829-11 METAL CHIP4.7K5%1/16W
R2311-216-829-11 METAL CHIP4.7K5%1/16W
R2321-216-829-11 METAL CHIP4.7K5%1/16W
R2331-216-089-11 RES-CHIP47K5%1/10W
R2341-216-089-11 RES-CHIP47K5%1/10W
R2351-216-033-00 METAL CHIP2205%1/10W
R2361-216-839-11 METAL CHIP33K5%1/16W
R2371-216-833-11 METAL CHIP10K5%1/16W
R2381-216-033-00 METAL CHIP2205%1/10W
R2391-216-845-11 METAL CHIP100K5%1/16W
R2501-216-825-11 METAL CHIP2.2K5%1/16W
R2511-216-821-11 METAL CHIP1K5%1/16W
R2521-215-859-00 METAL OXIDE225%1WF
R2531-216-853-11 METAL CHIP470K5%1/16W
R2541-216-049-11 RES-CHIP1K5%1/10W
R2551-216-077-00 RES-CHIP15K5%1/10W
R2561-216-833-11 METAL CHIP10K5%1/16W
R2571-220-894-11 METAL0.2210%5WF
R2581-216-825-11 METAL CHIP2.2K5%1/16W
R2591-216-821-11 METAL CHIP1K5%1/16W
R2601-215-859-00 METAL OXIDE225%1WF
R2611-216-017-00 RES-CHIP475%1/10W
(1902GX)
R2621-216-017-00 RES-CHIP475%1/10W
(1902GX)
R2631-216-825-11 METAL CHIP2.2K5%1/16W
(1902GX)
R2641-216-821-11 METAL CHIP1K5%1/16W
(1902GX)
R2651-216-833-11 METAL CHIP10K5%1/16W
R2661-216-833-11 METAL CHIP10K5%1/16W
(1902GX)
R2671-216-017-00 RES-CHIP475%1/10W
R2681-216-017-00 RES-CHIP475%1/10W
R3011-216-833-11 METAL CHIP10K5%1/16W
R3021-216-829-11 METAL CHIP4.7K5%1/16W
R3031-216-833-11 METAL CHIP10K5%1/16W
R3091-216-847-11 METAL CHIP150K5%1/16W
R3101-216-847-11 METAL CHIP150K5%1/16W
R3111-216-833-11 METAL CHIP10K5%1/16W
R3121-216-833-11 METAL CHIP10K5%1/16W
R3131-220-397-11 RES-CHIP4.7M5%1/16W
R3141-220-397-11 RES-CHIP4.7M5%1/16W
R3151-216-845-11 METAL CHIP100K5%1/16W
R8011-216-857-11 METAL CHIP1M5%1/16W
R8021-216-821-11 METAL CHIP1K5%1/16W
R8031-216-833-11 METAL CHIP10K5%1/16W
R8041-216-845-11 METAL CHIP100K5%1/16W
R8051-216-839-11 METAL CHIP33K5%1/16W
R8061-216-833-11 METAL CHIP10K5%1/16W
R8071-216-833-11 METAL CHIP10K5%1/16W
R8081-216-833-11 METAL CHIP10K5%1/16W
R8091-216-833-11 METAL CHIP10K5%1/16W
R8101-216-857-11 METAL CHIP1M5%1/16W
R8111-208-494-61 RES-CHIP2.2K2%1/8W
R8201-216-833-11 METAL CHIP10K5%1/16W
R8211-216-833-11 METAL CHIP10K5%1/16W
R8221-216-833-11 METAL CHIP10K5%1/16W
R8231-216-833-11 METAL CHIP10K5%1/16W
R8241-216-841-11 METAL CHIP47K5%1/16W
R8251-216-833-11 METAL CHIP10K5%1/16W
R8261-216-833-11 METAL CHIP10K5%1/16W
R8271-216-833-11 METAL CHIP10K5%1/16W
R8281-216-833-11 METAL CHIP10K5%1/16W
R8291-216-833-11 METAL CHIP10K5%1/16W
R8301-216-833-11 METAL CHIP10K5%1/16W
R8331-216-839-11 METAL CHIP33K5%1/16W
R8341-216-839-11 METAL CHIP33K5%1/16W
R8351-216-841-11 METAL CHIP47K5%1/16W
R8361-216-841-11 METAL CHIP47K5%1/16W
R8371-216-827-11 METAL CHIP3.3K5%1/16W
R8381-216-816-11 METAL CHIP3905%1/16W
R8391-216-857-11 METAL CHIP1M5%1/16W
R8401-216-816-11 METAL CHIP3905%1/16W
R8411-216-816-11 METAL CHIP3905%1/16W
R8421-216-816-11 METAL CHIP3905%1/16W
(1902GX)
R8431-216-816-11 METAL CHIP3905%1/16W
(1902GX)
R8441-216-816-11 METAL CHIP3905%1/16W
R8451-216-816-11 METAL CHIP3905%1/16W
R8461-216-816-11 METAL CHIP3905%1/16W
R8471-216-816-11 METAL CHIP3905%1/16W
R8481-216-816-11 METAL CHIP3905%1/16W
(1902GX)
R8501-216-833-11 METAL CHIP10K5%1/16W
R8511-216-816-11 METAL CHIP3905%1/16W
R8521-216-816-11 METAL CHIP3905%1/16W
R8531-216-827-11 METAL CHIP3.3K5%1/16W
R8541-216-827-11 METAL CHIP3.3K5%1/16W
R8551-216-827-11 METAL CHIP3.3K5%1/16W
(1902GX)
R8561-216-827-11 METAL CHIP3.3K5%1/16W
(1902GX)
R8571-216-827-11 METAL CHIP3.3K5%1/16W
R8581-216-827-11 METAL CHIP3.3K5%1/16W
R9341-216-821-11 METAL CHIP1K5%1/16W
R9421-208-474-61 RES-CHIP3302%1/8W
R9431-208-474-61 RES-CHIP3302%1/8W
< VARIABLE RESISTOR >
RV1011-227-320-11 RES, VAR, CARBON 50KX2 (PHASE (40Hz))
R8591-216-827-11 METAL CHIP3.3K5%1/16W
R8601-216-827-11 METAL CHIP3.3K5%1/16W
R8611-216-827-11 METAL CHIP3.3K5%1/16W
(1902GX)
R8621-216-827-11 METAL CHIP3.3K5%1/16W
(1902GX)
R8631-216-827-11 METAL CHIP3.3K5%1/16W
R8641-216-827-11 METAL CHIP3.3K5%1/16W
R9011-216-833-11 METAL CHIP10K5%1/16W
R9021-216-827-11 METAL CHIP3.3K5%1/16W
R9031-216-837-11 METAL CHIP22K5%1/16W
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R9061-216-065-00 RES-CHIP4.7K5%1/10W
R9071-216-190-00 RES-CHIP4702%1/8W
R9081-216-190-00 RES-CHIP4702%1/8W
R9091-216-061-00 METAL CHIP3.3K5%1/10W
R9101-216-073-00 METAL CHIP10K5%1/10W
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R9121-208-474-61 RES-CHIP3302%1/8W
R9131-216-049-11 RES-CHIP1K5%1/10W
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R9201-216-001-00 METAL CHIP105%1/10W
R9211-216-001-00 METAL CHIP105%1/10W
R9221-216-001-00 METAL CHIP105%1/10W
R9231-216-825-11 METAL CHIP2.2K5%1/16W
R9241-216-825-11 METAL CHIP2.2K5%1/16W
R9251-216-081-00 METAL CHIP22K5%1/10W
R9261-216-081-00 METAL CHIP22K5%1/10W
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R9281-216-073-00 METAL CHIP10K5%1/10W
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R9321-216-821-11 METAL CHIP1K5%1/16W
R9331-216-821-11 METAL CHIP1K5%1/16W
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Ver.DateDescription of Revision
1.12001. 06Corrected error for Q108, 110, 112, 208, 210, 212 and R819.
Added for condition of Bias Adjustment.(SPM-01013)
1.02000. 12New
(ENG-01006)
24
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