Infinity ExtraPointFive SERVICE MANUAL

ENTRA

ENTRA POINT FIVE HTS

POWERED SUBWOOFER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev 2 12/2002

TABLE OF CONTENTS

2

SPECIFICATIONS . . . . . . . . . .. . . . . . . . . . . . ... . . . . . . . . . .3

DETAILED SPECIFICATIONS . . . ... . . . . . . …….…… . . . . .4

CONTROLS and CONNECTIONS . . . .. . . . . . . . . .. . . . . . . .5

OPERATION . . . . . . . . . . . .. . . . . . . . . . . . . . . …... .. . . . . . .7

MECHANICAL/PACKAGING PARTS LIST . .. . . . . . . . . . . . .8

EXPLODED VIEW . . . .. . . . . . . . . . . . . . . . …………. . . . . . .9

PACKAGING . . . . . . . .. . . . . . . . . . . . . . . ……………. . . . . .10

TEST SETUP AND PROCEDURES . . . .. . . . . . . . . . . . . . . .11

ELECTRICAL PARTS LIST . . . . . . . .. . . . . . . . . . . . . . . . . . .12

INTEGRATED CIRCUIT DIAGRAMS . . . . . . . . ……... . ….. .17

BLOCK DIAGRAM . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .19

PCB DRAWINGS. . . .. . . . . . . . . . . . . . . …………….. . . . ….20

SCHEMATICS . . . . . . . . . . . . . . . . . . . ……... . . . . . . . . . . . .23

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3

Specifications

Frequency Response: 34Hz- 150Hz (±3dB)

Maximum Amplifier Power 150 watts*, RMS, 500 watts peak,

(20Hz - 150Hz with no more than 0.1%
THD)

Crossover Frequencies: 50Hz - 150Hz, 24dB/octave,

continuously variable

Driver: 10” (245mm) C.M.M.D. shielded

DCR = 3.3 ohms ±10%

Dimensions (H x W x D): 15" x 14-1/2" x 17"

(381mm x 368mm x 432mm)

Weight: 47 lb (21.4kg) Each

Infinity continually strives to update and improve existing products, as well as create new ones. The
specifications and construction details in this and related Infinity publications are therefore subject to
change without notice.

Detailed Specifications

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4

Entra Subwoofer

5

Controls and Connections

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6

Controls and Connections (Cont.)

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7

Operation

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MECHANICAL PARTS LIST

1 SCREW, (16), #8 x .75, BLK, PB TRPH 336806-001

AMPLIFIER NOT FOR SALE

2 WOOFER, 10” (254mm)C.M.M.D.

SHIELDED DCR = 3.3 ohms ±10% 336649-001

3 GRILLE CUP (6) 333249-001

4 SCREW, (6), #6 x .75, BLK, PB PPH 903401-012

5 GRILLE 336454-001

6 FRONT BAFFLE 336452-001

7 FOOT (4) 330163-001

8 PORT TUBE 336806-001

PACKAGING

9 OWNERS MANUAL 336422-002

10 WARRANTY CARD 335841-001

11 SURVEY CARD 335868-002

12 PAD, TOP, END (2) 336457-001

13 CARTON 336458-001

Mechanical/Packaging Parts List

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9

1

AMPLIFIER

(NOT FOR SALE)

PRE AMP

PCB ASSEMBLY

MAIN AMP

ASSEMBLY

POWER SUPPLY

PCB ASSEMBLY

2

1

3

4

5

6

1

7

8

INFINITY

ENTRA SUBWOOFER

CABINET

(NOT FOR SALE)

00470

TO SERVICE THE ENTRA SUBWOOFER

1) Remove the grille.

2) Extract (6) rubber grille retainers as shown in the illustration above; this can be accomplished by
carefully pulling them out of the cavities w ith long-nosed pliers or similar tool.

3) Remove the (6) Phllip s screws that are now expo sed.

4) Remove the front baffle.

5) Remove the (6) screws that secure the driver.

6) To service th e am plifier, rem ove the (10) Phillips screws at the rear of the enclosure, and pull
the amplifier ou t of the back. Remove the tw o Phillips screws as indicated in VIEW A to remove the re ar cover.

VIEW A

REMOVE
THESE
SCREWS

INFINITY SYSTEMS INC. NORTHRIDGE, CA, USA

DIRECT

DIRECT INPUT BYPASSES FILTER

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

ATTENTION: POUR ÉVITER TOUT RISQUE DE FEU OU CHOC
ÉLECTRIQUE, NE PAS EXPOSER CET APPAREIL À LA PLUIE OU À
L'HUMIDITÉ.

AMPLIFI ER MA DE IN CHINA

R

SERIAL NO.

SPEAKER LEVEL

INPUT

_

+

R

L
_

+

R

+

_

OUTPUT

L
_

+

LEVEL

LINE

INPUT

WARNING: SHOCK HAZARD-DO NOT OPEN

NO USER SERVICEABLE PARTS INSIDE

AVIS: RISQUE DE CHOC ÉLECTRIQUE-

NE PAS OUVRIR

120V ~ 60 Hz 3A

OFF

POWER

ON

FREQUE NCY

CROSSOVER

MAXMIN

180°

0°

60

50

LEVEL PHASE

80

150

120

R

Exploded View

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Packaging

9

10

11

12

12

13

00472

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11

SYSTEM AURAL SWEEP TEST
Equipment needed:

• Function/signal generator/sweep generator

• Integrated Amplifier

• Multimeter

• Speaker cables

General Unit Function (UUT = Unit Under Test)

Switches/knobs on the amplifier faceplate:

Crossover Frequency adjust full CW (150Hz)
Phase switch – either position

1. From the signal generator, Connect single line level input (RCA) cable to “Line Level Input” jack on UUT.

2. Turn the LEVEL control full counterclockwise (Min).

3. Turn on generator, adjust to 400mV, 30 Hz.

4. Plug in UUT; turn the power switch ON. Turn LEVEL control full clockwise (Max)

5. LED should now be Green; immediate bass response should be heard and felt from rear port tube
opening.

6. Turn off generator, turn LEVEL control fully counterclockwise (Min), disconnect RCA cable.

7. Connect two pairs of speaker cables to Speaker Level input terminal on UUT. Cables should be connected
to an integrated amplifier fed by the signal generator. Observe polarity.

8. Turn on generator and adjust so that speaker level input at the amplifier is 6.0V, 30 Hz. Turn LEVEL
control full clockwise (Max)

9. Green LED should light, immediate bass response should be heard and felt from the port tube opening.

Sweep Function

1. Follow steps 7-10 above, using a sweep generator as a signal source.

2. Sweep generator from 20Hz to 20kHz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or
any other noises. If any unusual noises are heard, remove woofer and test.

Driver Function (Woofer)

1. Remove woofer from cabinet; detach + and - wire clips. See page 9 for removal instructions.

2. Check DC resistance of woofer; it should be 3.3 ohms±10%.

3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated
amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.

4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

Test Setup and Procedure

SIGNAL

GENERATOR

AMPLIFIER

AC VOLT

METER (10V)

ENTRA SUB

UNDER TEST

OUTPUT FROM

GENERATOR/AMPLIFIER

AMPLIFIER MADE IN CHINA

INFINITY SYSTEMS INC. NORTHRIDGE, CA, USA

R

W

ARNING: SHOCK HAZARD-DO NOT OPEN
NO USER SERVICEABLE PARTS INSIDE

AVIS: RISQUE DE CHOC ÉLECTRIQUE-

NE PAS OUVRIR

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

ATTENTION: POUR ÉVITER TOUT RISQUE DE FEU OU CHOC
ÉLECTRI QU E, NE PA S EX PO SE R C E T AP PA R E IL À LA PLU I E OU À
L'HUMIDITÉ.

SERIAL NO.

OFF ON

120V ~ 60Hz 3A

POWER

R

+

_

+

_

L

OUTPUTINPUT

DIRECT I NPU T BY PASSES FILTER

LEVEL

00473

R

DIRECT

+

_

MIN

+

INPUT

LINE

LEVEL

_

L

120

CROSSOVER

80

60

1

80°

MAX

0°

501

50

PHASE

FREQUENCY

R

SPEAKER LEVEL

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Electrical Parts List

Part Description Designator Quantity

No.

PRE AMP PCB ASSEMBLY

Resistors

020-100498-120 CARBON FILM RESISTOR 1K 1/8W J R107,123,138 3
020-100598-120 CARBON FILM RESISTOR 10K 1/8W J R136,127,121, 6

135,124,125
020-100698-120 CARBON FILM RESISTOR 100K 1/8W J R133 1
020-110598-120 CARBON FILM RESISTOR 11K 1/8W J R122 1
020-150598-120 CARBON FILM RESISTOR 15K 1/8W J R118 1
020-180698-120 CARBON FILM RESISTOR 180K 1/8W J R128 1
020-220698-120 CARBON FILM RESISTOR 220K 1/8W J R126,129 2
020-330498-120 CARBON FILM RESISTOR 3K3 1/8W J R132,134 2
020-750498-120 CARBON FILM RESISTOR 7K5 1/8W J R110,112 2
021-100401-120 M.O.F. RESISTOR 1K 1W J MO-100 R101,102 2
021-100598-100 METAL FILM RESISTOR 10K 1/8W F R109 1
021-154598-100 METAL FILM RESISTOR 15K4 1/8W F (MF) R137 1
021-169598-100 METAL FILM RESISTOR 16K9 1/8W F (MF) R120 1
021-200698-100 METAL FILM RESISTOR 200K 1/8W F R103,104,105,106 4
021-215598-100 METAL FILM RESISTOR 21K5 1/8W F (MF) R111 1
021-280498-100 METAL FILM RESISTOR 2K8 1/8W F R130 1
021-442598-100 METAL FILM RESISTOR 44K2 1/8W F R131 1
021-511498-100 METAL FILM RESISTOR 5K11 1/8W F R116,117 2

Capacitors

030-100247-300 CERAMIC CAPACITOR 0u1/50V Z P:5 C110,109,121,122, 6

118,119
030-220223-300 CERAMIC CAPACITOR 220P/50V K P:5 C105,106,107 3
032-100243-301 PE CAPACITOR 0u1/63V J P:5m/m C114 1
032-220353-300 PE CAPACITOR 0u22/63V J P:5m/m C104,108 2
032-470353-303 PE CAPACITOR 0u47/63V J P:5m/m C113,125,123 3
034-100525-300 ELEC. CAPACITOR 10uF/25V M (R) P:5 C102,103,120 3
034-100614-300 ELEC. CAPACITOR 100uF/16V M (R)2.5 C127,128 2
034-100715-200 ELEC. CAPACITOR PC 1000uF/16V M (R)P:5 C124 1
034-220515-300 ELEC. CAPACITOR PC 22uF/16V M (R) P:5 C111 1

Semiconductors

050-414802-100 DIODE 1N4148 D101,102,103, 5

104,109
050-505200-000 LED P/N:UDC-5052W LED D110 1
051-101501-000 TRANSISTOR PNP 2SA1015GR TO-92 Q102,103 2
051-181502-000 TRANSISTOR NPN 2SC1815GR TO-92 Q101 1
053-007200-000 IC TL072 CP DIP DUAL OP-AMP IC102 1
053-007400-000 IC TL074CN QUAD OP-AMP IC101 1
053-455801-000 I.C PC BA4558 (ROHM) DUAL OP-AMP IC103 1

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Electrical Parts List

Part Description Designator Quantity

No.

Miscellaneous

072-010058-000 RCA JACK 2P P/N:052000W1G(Red,White) JK101 1
074-030002-000 TOGGLE SW P/N L101 SW101 1
083-031605-000 CONNECTOR LEAD WIRE #26 L:60mm #18 L:70mm CN1 1
083-052618-000 CONNECTOR LEAD WIRE EH2.5-7P+SCN2.5P+7 CN101 1

LEAD WIRE
026-200595-263 VR P/N:R1210G-2A1-B20Kx2 10% VR101 1
026-200595-264 VR P/N:R1210N-2A1-B20K 10% VR102 1

MAIN AMP ASSEMBLY

Resistors

020-100398-120 CARBON RESISTOR 100R 1/8W J R511,714,719 3
020-100498-120 CARBON RESISTOR 1K 1/8W J R506,721,507,702 4
020-100598-120 CARBON RESISTOR 10K 1/8W J R503,610,504,510, 7

512,601,606
020-100698-120 CARBON RESISTOR 100K 1/8W J R712,725,731 3
020-150498-120 CARBON RESISTOR 1K5 1/8W J R713,718,721 3
020-150598-120 CARBON RESISTOR 15K 1/8W J R607,709,711 3
020-220498-120 CARBON RESISTOR 2K2 1/8W J R710,742 2
020-220598-120 CARBON RESISTOR 22K 1/8W J R502,508,701,703 4
020-220698-120 CARBON RESISTOR 220K 1/8W J R603 1
020-270398-120 CARBON RESISTOR 270R 1/8W J R715,717 2
020-270698-120 CARBON RESISTOR 270K 1/8W J R611 1
020-330297-120 CARBON RESISTOR 33R 1/4W J R723,724 2
020-390598-120 CARBON RESISTOR 6 39K 1/8W J R716 1
020-470498-120 CARBON RESISTOR 4K7 1/8W J R602 1
021-470597-120 M.O.F. RESISTOR 47K 1/4W J R728 1
020-470598-120 CARBON RESISTOR 47K 1/8W J R505,604,605 3
020-560398-120 CARBON RESISTOR 560R 1/8W J R743 1
021-100003-020 M. O. F. RESISTOR 0R1 3WS J R734,735 2
021-100201-121 M. O. F. RESISTOR 10R 1W J MO R608,609 2
021-100397-120 M. O. F. RESISTOR 100R 1/4W J R726,730 2
021-100401-120 M. O. F. RESISTOR 1K 1W J R739 1
021-100496-120 M. O. F. RESISTOR 1K 1/2W R727,729 2
021-330498-120 M. O. F. RESISTOR 3K3 1/8W J R720 1
021-499698-100 METAL FILM RESISTOR 499K 1/8W F R513,509 2
021-680296-120 M. O. F. RESISTOR 68R 1/2W J R732,733 2

Capacitors

030-100264-300 CERAMIC CAPACITOR 0u1/100V K NPO C718,707,708,719 4
030-220223-300 CERAMIC CAPACITOR 220P/50V K P:5 C703,702,717,716 4
030-220244-261 CERAMIC CAPACITOR 22pF/50V J NPO C712,713 2
030-470344-200 CERAMIC CAPACITOR PC 470pF/50V 10 C715,714,711,710 4

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Electrical Parts List (Cont.)

Part Description Designator Quantity

No.

032-100393-300 PE CAPACITOR 0u1/63V J P:5 C606,607,601,709 4
034-100515-301 ELEC. CAPACITOR PC 10uF/16V M (R)0511 C701,723 2
034-100615-301 ELEC. CAPACITOR 100uF/16V M (R)0611 C605 1
034-100695-300 ELEC. CAPACITOR 100uF/63V M (R)1012 C720,721 2
034-470415-300 ELEC. CAPACITOR 4u7/50V M (R)0511 P: C501,603 2
034-470515-000 ELEC. CAPACITOR 47uF/16V M (R)0511 C502,604,704 3
035-220143-100 PE CAPACITOR FE-M 0u0022/63V J P:5m/m C608 1
035-220243-100 PE CAPACITOR FE-M 0u022/63V J P:5m/m C503 1

Semiconductors

050-003000-100 ZENER DIODE 30V HZ-30-2 05000881 D807 1
050-400201-100 DIODE 1N4002 100V/1A TAPING D710,711,601, 6

717, 712, 806

050-414802-100 DIODE 1N4148 D501,713,715,716, 7

714,708,709
053-123700-100 IC PC UPC 1237HA LIMITER IC601 1
053-455801-000 I.C PC BA4558 (ROHM) OP-AMP IC501,701 2
051-003100-000 TRANSISTOR TIP 31C TO-220 Q707 1
051-003200-000 TRANSISTOR TIP 32C TO-220 Q708 1
051-046900-000 TRANSISTOR 4 BF469 Q704 1
051-047000-000 TRANSISTOR BF470 Q703 1
051-066900-000 TRANSISTOR 1 2SD669A (C class) Q711 1
051-138600-000 TRANSISTOR 2SA 1386(SANKEN) TO-3P Q710 1
051-181500-000 TRANSISTOR PC 2SC1815GR Q501,502,602,603 4
051-351900-000 TRANSISTOR 2SC 3519(SANKEN) TO-3P Q709 1
051-540100-000 TRANSISTOR 2N5401 Q702,706,601 3
051-555100-000 TRANSISTOR 2N5551 TO-92 Q701,705 2

Miscellaneous

061-700011-101 SLICON RUBBER PCS P/N:1877 110x30mm t=0.19mm 1
072-040007-000 7P WAFER SWA101 BC501 JS-1001-07 1
072-040039-000 TERMINAL (PCB) PC205 (t=0.8m/m)T205MA J602 1
072-040041-000 TERMINAL(PCB) T250MA (P/N 0635R-BL2) J601 1
072-040206-000 CONNECTOR P/N:3PIN JS-1001-4 P:2.5 CON802 1
073-014005-600 BRACKET(LEFT SIDE) PCS 72x19m/m t=1mm 1
073-014006-600 BRACKET(RIGHT SIDE) PCS 72x19m/m t=1mm 1
074-300004-000 RELAY 48VDC P/N PCE-148D1H RLY601 1
083-022547-000 CONNECTOR WIRE #18 VH3.96+SCN2.5 CN302 1
025-050001-000 VARISTOR TSA-104 TH601 1

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Electrical Parts List (Cont.)

Part Description Designator Quantity

No.

POWER SUPPLY PCB ASS’Y

Resistors

020-820497-120 CARBON RESISTOR 8K2 1/4W J R301,304 2
021-470301-120 MO RESISTOR 470R 1W J MB TYPE MO-100 R303,302 2

Capacitors

030-100264-300 CERAMIC CAPACITOR 0u1/100V K NPO TAPING C2,3 2
030-100295-201 UL SAFETY CAPACITOR YS-SC103Z2 10000pF/400V C309 1
034-220515-300 ELEC. CAPACITOR PC,308 22uF/16V M (R)0511 C307 1
034-220615-301 ELEC.CAPACITOR 220uF/16V M (R)0611 P:5 C305,306 2
034-470763-301 ELEC.CAPACITOR 4700uF/63V M (R) 25*40 C303,304 2

Semiconductors

050-001500-000 DIODE 15V 1/2W HZ15-3 ZD301,302 2
051-118900-100 TRANSISTOR 2SD882P(TO-220) Q301 1
051-677000-000 TRANSISTOR 2SB772 (TO-220) Q302 1

Miscellaneous

052-602000-000 RECTIFY DIODE KBU8D(SUB-100W) 8A/200V BD2 1
072-040032-000 WAFER 2 P:3.96 3P MALE VH CN30 1
073-032027-000 HEAT SINK PCS 40x24x2.0m/m 1
083-021805-000 LEAD WIRE #22 GND WIRE L:80mm 5TT+5TT 1
083-022548-000 LEAD WIRE #18 UL1015 PCS T187(t0.8)+ B1811T0P-2 2
083-031603-000 4Px120mm CONNECTOR 1 LEAD WIRE #22 +5TT CN30 1
091-000130-000 FUSE HOLDER PCS P/N:CQ-203SP 2

093-105203-300 FUSE:UL GSL(2AG) FUSE:3A,250V,5*20mm F301 1

MISCELLANEOUS

005-009885-000 GASKET 97.5x85x36cm 1
005-033420-000 STYROFOAM 335.0x191.0x65.0mm 40
008-068701-000 GASKET SM-55 GASKET 860.0x5.0 t=2.0mm 2
042-010042-000 TRANSFORMER P/N:PT-1739 1
061-020000-000 KNOB ABS HTS-10/20 p20x15m/m UL94V-0 BLK 2
061-314002-000 CORD BUSHING P/N SB4F-2 1
061-800000-000 TRANSISTOR COVER P/N:TW-1 2
062-050400-000 PUSH TERMINAL 4P JK102A,JK102B P/N E405 2
062-261313-000 BUCKET(HI PS 94VO)304.8x177.8x124.2m/m BLK 1
063-062512-000 PLATE 304.8x177.8 t=2.5mm (SPCC) 1
066-120300-900 CABLE TIE PCCV-120S 3
070-000030-410 SCREW TRANSFORMERx4,HEAT SINKx6 M4;4x10m/m BLK 10
070-040010-210 SCREW PC TRAN.x5,TH601x1,GROND WIREx1 PMS M3x10m/m BLK 7
070-400010-206 SCREW PCB VS BRACKETx4,BRACKET VS HEAT SINKx23x6m/m BLK 6
070-400010-212 SCREW 3x12m/m BLK 1
070-400010-812 SCREW RCA JACKx1 PTS-4 3x12 BLK 1

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071-060031-400 NUT WITH GEAR TRANS FOR MERx2 K-NUT 4p 2
071-100810-100 FLAT WASHER PC TRANS FOR MERx4 ID=4.3 OD=9.5 t=0.8m/m 4
071-140031-901 GEAR WASHER BACK PANEL VS GROUND WIRE M3 BLK 1
072-050002-000 GROUND WASHER GROUND WIRE VS PANEL GND-1 1
073-032306-600 HEAT SINK ALUM. 154x125x34mm 1
074-020015-000 ROCKER SW 125V/5A P/N:R19-33A(SPST)PIN LOCK TYPE 1
083-041600-004 AC CORD SPT-2 #16 12 FEET+5TT DOUBLE INSULATE 1

Electrical Parts List (Cont.)

Part Description Designator Quantity

No.

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17

Integrated Circuit Diagrams

Entra Subwoofer

18

Integrated Circuit Diagrams (Cont.)

NEUTRAL

VOLTAGE

DETECTION

OVERLOAD

DETECTION

FLIP-FLOP

CIRCUIT

Vcc ON

MUTE

AC OFF

DETECTION

RELAY
DRIVE

CIRCUIT

SWITCH for

LATCH AUTOMATIC

RESET

1

OVERLOAD

DETECTION

NEUTRAL
VOLTAGE

DETECTION

2

5

GND

SWITCH for

LATCH

AUTOMATIC

RESET

3

AC OFF DETECTION

4

6

8

7

MUTING

Vcc

00330

µPC1237HA IC601

µPC1237HA IC601

1

8

Entra Subwoofer

19

Block Diagarm

F

21

3

4

5678

132 7682

F

VARI. LPF
2rd order

DIR/NOR
MIXER

FIX LPF

2rd order

AC/DC
CONVERTER

LED
DIRVER

+15V

-15V

-

+

INPUT MAX

-

+

CLAMPING
CIRCUIT

SPK.
DIRVER
CIRCUIT

SP.

GEN RED

VOL
CTL

0°

180 °

HPF
2rd order

PHASE
SW

15K4

15K

Direct

Nor.input

R

L

+

-

-

+

SPK IN SPK OUT

00474

A

B

C

D

A

B

C

D

20

21

22

Entra Subwoofer

23

Preamp Schematic

L.L

2K8

R130

.47u 63V

C123

R131
44K2

L.L

3

21

Q101

C1815

.47u 63V

C125

-15V

+15V

100u 16V

C128

C127

100u 16V

6

5

7

IC102:B

TL072

C124

1000u 16V

654321

H

G

F

E

D

C

B

A

654321

A

10

987

E

D

C

B

H

10987

F

G

200K

R103

200K

R104

200K

R105

200K

R106

1K 1W

R101

SPEAKER

IN PUT

1

2

3

4

+

-

LCH

RCH

-

+

JK102:A

5

6

7

8

+

-

LCH

RCH

-

+

JK102:B

R102

1K 1W

VARIABLE LPF

220P 50V

C107

OUT PUT

SPEAKER

1N4148

D103

1N4148

D104

C110

.1u 63V

C102

10u 25V

C105

220P 50V

R107

1K

R112

7K5

3

2

1

11

4

TL074

IC101:A

.47u 63V

C113

R116

5K11

3

2

1

20KB

VR101:A

6

5

4

VR101:B

20KB

C103

10u 25V

220P 50V

C106

D101

1N4148

D102

1N4148

.1u 63V

C109

R110

7K5

R117

5K11

.022u 50V

C108

.22u 63V

C104

C114

.1u 63V

21K5

R111

10K

R109

13

12

14

TL074

IC101:D

6

5

7

TL074

IC101:B

R118

15K

16K9

R120

11K

R122

0

VOLUME CONTROL

10

9

8

IC101:C

TL074

R127

10K

C121

.1u 63V

R123

1K

3

2

1

4

8

TL072

IC102:A

C122

.1u 63V

R124
10K

C118

.1u 63V

180

PHASE SW

2

1

3

SW101

R136

10K

321

VR102

20KB

R125

10K

C120

10u 16V

R121

10K

1N4148

D109

3

2

1

4

8

IC103:A

BA4558

C119

.1u 63V

R138

1K

C111

22u 16V

R126
220K

Normal

Direct

2

1

3

JK101

R137

15K4

100K

R133

180K

R128

7561234

CN101

R132

3K3

GRN

R135

10K

3

21

A1015

Q102

220K

R129

3

21

Q103
A1015

R134

3K3

RED

2

3

1

D110

Entra Subwoofer

24

Power Amp Schematic

10K

R510

10K

R512

100

R511

R506

1K

2SC1815

Q502

47u 16V

C502

47K

R505

1N4148

D501

1K

R507

6

5

7

IC501:B
BA4558

499K

R509

R513
499K

D806

1N4002

-15V

+15V

AC1

1

2

3

4

5

6

7

BC501

4u7 50V

C501

22K

R502

15K

R607

10K

R504

2SC1815

Q501

10K

R503

2

3

1

8

4

+

-

BA4558

IC501:A

-15V

R508

22K

R702

1K

10u 16V

C701

22K

R701

C702
220p

+15V

C704

47u 16V

220p

C703

560

R743

-15V

+15V

2N5551

Q701

22p

C712

R709

15K

100K

R712

(C)

(C)

2

3

1

8

4

+

-

BA5532

IC701:A

C707

.1u

D713

1N4148

C708

.1u

2K2

R710

D715

1N4148

-15V

+15V

(C)

(PE)

10u 16V

C723

C721

100u/63V

C713

22p

R711

15K

C719

.1u

C503

.022u

Q702

2N5401

D716

1N4148

C715

470p

33 1/4W

R724

Q704

BF469

100

R719

JUMP

JP2

1K5

R718

V-

V1-

100K

R731

C711
470p

1N4002

D717

1K 1/2W

R729

100 1/4W

R730

(PE)

270

R717

270

R715

39K

R716

Q711

2SD669

1K5

R721

C714

470p

Q703

BF470

3K3

R720

C709

.1u

33 1/4W

R723

100 1/4W

R726

470p

C710

1N4148

D714

D712

1N4002

100K

R725

1N4148

D708

R727
1K 1/2W

2N5551

Q705

Q706

2N5401

47K 1/4W

R728

1N4148

D709

C716

220p

68 1/2W

R732

R733

68 1/2W

R609

10 1W

D710

1N4002

2SC3519

Q709

TIP31F

Q707

.1 3W

R734

R735

.1 3W

220p

C717

RLY601

D711
1N4002
2SA1386

Q710

Q708

TIP32F

D601

1N4002

TH601

TSA-104

R611

270K

Q603

2SC1815

2SC1815

Q602

R610

10K

47K

R604

R603
220K

(PE)

(PE)

(PE)

4u7 50V

C603

C608

.0022u

C607

.1u

47K

R605

R602

4K7

R601

10K

C601

.1u

7

1

2

3

4

5

6

8

IC601

UPC1237HA

Q601

2N5401

100u 16V

C605

C604

47u 16V

V+

10K

R606

1K 1W

R739

D807

30V

V+

V1+

(C)

JP1

JUMP

2K2

R742

22K

R703

100u/63V

C720

.1u

C718

1K5

R713

100

R714

(PE)

10 1W

R608

.1u

C606

J602

J601

CON601

C

B

A

4

3

C

B

A

2

1

F

E

D

2

1

E

F

D

4

3

00303-2

Entra Subwoofer

25

Power Supply Schematic

L
N

U3

AC PLUG

S1

C309

0.01u/250V

V-

16

5

13

2

10

12

14

V+

R303

1K1W

R304

8K2

8K2

R301

R302

1K 1W

C305

220/16V

C306
220/16V

C303

4700u/63V

C304

4700u/63V

BD2

KBU8D

2L1

F301

T3A/250V

1

2

3

CON302

0.1u

C2

0.1u

C3

HZ15-3

ZD301

HZ15-3

ZD302

C307

22U/16V

C308

22U/16V

2

1

3

4

CON301

2SD882

Q301

2

1

3

2SB772

Q302

E

D

3

2

1

C

B

A

4

3

2

1

A

B

C

8

7

6

5

D

E

8

7

6

00319