JBL BTX-250 Service manual

Service Manual

BTX250

• 250mm subwoofer and 250mm passive radiator

combined with a 100W RMS amplifier housed in
a specific enclosure, all carefully engineered to
work together as a unique, integrated system.

• 12 dB/octave electronic low pass filter with

selectable 40Hz-120Hz crossover frequency for
precise frequency division to match any system

Variable Bass Boost for up to 6dB more level at

•
50Hz

• Line-level and speaker-level Inputs to integrate
seamlessly with virtually any factory-installed
head unit

• Variable input sensitivity for compatibility with all
source units and factory head units

Specifications

Dynamic Range: CD: 100W
RMS Power Handling: 300W
Max Power Handling: 20Hz - 160Hz
Frequency Response: 40 - 120Hz
Active Crossover: 4 Ohms
Impedance: 0 - 180°
Phase control: 0 to +6dB @ 40Hz
Dimensions (H x W x D): 625 x 320 x 315 mm

• Effective protection circuitry against short circuit,
overheating and over-current

• High-quality power, input and output connectors
for clean, tight, long-lasting connections

• Power-On indicator led for visible indication of
amplifier status

August 02

BTX-250 SPARE PARTS

POWER AMP

POS ITEM NO. DESCRIPTION QTY

ASYJBL50 PCB ASSY AMP JBL50 1

027112092 PCB CSA50 POWER 112X92MM PCB Blank 1
Q1,Q3,Q4,Q6,Q7,Q8,Q103,Q104 122SA1015 TRANSISTOR TOSHIBA 2SA1015 250MA 60V 0.4W 8
Q2,Q5,Q101,Q102,Q112 122SC1815 TRANSISTOR TOSHIBA 2SC1815 250MA 60V 0.4W 5
Q13,QM1 123T0K30A TRANSISTOR MOS K30A (T0-92) 2
Q11,Q12 123TRFZ44 TRANSISTOR IR IRFZ44V 60V 55A 115W 2
Q106 124T0SA06 TRANSISTOR TR MOTOROLA MPSA06 N 0.5A 80V 1
Q107 124T0SA13 TRANSISTOR TR MOTOROLA MPSA13 N 0.5A 30V 1
Q105 124T0SA56 TRANSISTOR TR MOTOROLA MPSA56 P 0.5A 80V 1
Q110 128TTI35C TRANSISTOR TR SGS OR TI TIP35C N 25A 1
Q111 128TTI36C TRANSISTOR TR SGS OR TI TIP36C P 25A 100V 1
Q109 129TB647A TRANSISTOR TR HITACHI 2SB647AC 100V 1A 1
Q108 129TD667A TRANSISTOR TR HITACHI 2SD667AC 100V 1A 1
D2,D3,D4,D5,D8,D9 131TN4148 DIODE NS 1N4148 HSS 150MA 100V 52MM 6
ZD1,ZD2 133T0015B ZENER DIODE NEC RD15EB3 ZNR 0.5W 15V 52MM 2
D1 134TN5402 RECTIFYING DIODE 1N5402 RET 3.0A 100V 1
D7 136T1220A FAST RECOVER RECTIFIER F12C20A 12A 200V (TO220) 1
D6 136T1220C FAST RECOVER RECTIFIER F12C20C 12A 200V (TO220) 1
U1 158TTL494 IC DIP16 NEC UPC494 OR TI TL494 1
L1 174114005 INDUCTANCE DIOX30 D=2.1 5.0UH(VERTICAL TYPE) 1
T1 181T02804 POWER TRANSFORMER JBL-50 28∮ 6:16 VARNISH T2804 1
R33 220440101 RESISTOR CARBON CR 1/4W 100Ω J 1
R30 220440242 RESISTOR CARBON CR 1/4W 2.4KΩ J 1
R10 220880100 RESISTOR CARBON CR 1/6W 10Ω J 1
R5,R25,R26,R104,R105,R111,R112 220880101 RESISTOR CARBON CR 1/6W 100Ω J 7
R12,R19,R20,R21,R22,R113,R122 220880102 RESISTOR CARBON CR 1/6W 1KΩ J 7
R1,R8,R9,R28,R102,R124,RM1 220880103 RESISTOR CARBON CR 1/6W 10KΩ J 7
R125 220880133 RESISTOR CARBON CR 1/6W 13KΩ J 1
R18 220880153 RESISTOR CARBON CR 1/6W 15KΩ J 1

POWER AMP

POS ITEM NO. DESCRIPTION QTY
R11 220880201 RESISTOR CARBON CR 1/6W 200Ω J 1
R118 220880221 RESISTOR CARBON CR 1/6W 220Ω J 1
R16,R101,R121,R123 220880222 RESISTOR CARBON CR 1/6W 2.2KΩ J 4
R107,R110 220880272 RESISTOR CARBON CR 1/6W 2.7KΩ J 2
R15 220880273 RESISTOR CARBON CR 1/6W 27K OHM J 1
R114 220880302 RESISTOR CARBON CR 1/6W 3KΩ OHM J 1
R14,R17 220880333 RESISTOR CARBON CR 1/6W 33KΩ J 2
R115 220880432 RESISTOR CARBON CR 1/6W 4.3KΩ J 1
R116,R117 220880470 RESISTOR CARBON CR 1/6W 47Ω J 2
R2,R3,R4,R6,R7,R13 220880472 RESISTOR CARBON CR 1/6W 4.7KΩ J 6
R108,R109 220880512 RESISTOR CARBON CR 1/6W 5.1KΩ J 2
R103,R106 220880681 RESISTOR CARBON CR 1/6W 680Ω J 2
R27 220880683 RESISTOR CARBON CR 1/6W 68KΩ J 1
R29 231100220 RESISTOR METAL MO 1W 22Ω J 1
R31,R32 231100681 RESISTOR METAL MO 1W 680Ω J 2
R119,R120 23251001A CEMENT TYPE RESISTOR SQM 5W 0.1Ω (VERTICAL TYPE) 2
RT 261T05103 THERMISTOR NTC THERMISTOR D103J 10K 1
C102,C107,C109 31JT10105 C/C C/C NPO 100PF/50V J 3
C13 31JT68125 C/C C/C Y5E 680PF/250V K 1
C1,C4,C8,C105,C110 31ZT10410 C/C C/C 0.1U/100V Z 5
C108 32JT10410 M/C M/C 0.1UF/100V J (MINISIZE) 1
C10 32JT68210 M/C M/C 0.0068UF/100V J 1
C5,C9,C12,C18,C19,C22 340T10625 E/C 10UF/25V 5*11 +20-10% 6
C7,C11,C21,C106 340T10725 E/C 100UF/25V 6*11 +20-10% 4
C14,C15 340T22851 E/C 2200UF/50V 16*32 +20-10% 2
C103,C104 340T33725 E/C 330UF/25V 8*14 +20-10% 2
C101 340T47550 E/C 4.7UF/50V 5*11 +20-10% 1
C6 340T47625 E/C 47UF/25V 5*11 +20-10% 1
C3 341T22835 E/C 2200UF/35V 18*27 105℃ 1
J1,J2,J3,J4,J5,J6,J7,J8,J9,J10,J11,J12,C20,JP14 400T06520 JUMP WIRE JUMP 0.6*52MM 14