Infinity Entra Subwoofer Rev1 sm.qxd

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
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
2
Entra Subwoofer
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.
3
Entra Subwoofer
Detailed Specifications
4
Entra Subwoofer
Controls and Connections
5
Entra Subwoofer
Controls and Connections (Cont.)
6
Entra Subwoofer
Operation
7
Entra Subwoofer
Mechanical/Packaging Parts List
MECHANICAL PARTS LIST
1
SCREW, (16), #8 x .75, BLK, PB TRPH
336806-001
AMPLIFIER
NOT FOR SALE
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
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
2
PACKAGING
8
Entra Subwoofer
Exploded View
1
AMPLIFIER
(NOT FOR SALE)
PRE AMP
PCB ASSEMBLY
MAIN AMP
ASSEMBLY
POWER SUPPLY
PCB ASSEMBLY
INFINITY
ENTRA SUBWOOFER
CABINET
(NOT FOR SALE)
2
1
3
4
8
7
00470
1
SPEAKER LEVEL
INPUT
OUTPUT
R
+
+
L
L
_
_
_
_
R
R
+
+
LINE
LEVEL
INPUT
LEVEL
PHASE
CROSSOVER
FREQUENCY
80
0°
DIRECT
MIN
60
180°
MAX
120
50
150
REMOVE
THESE
SCREWS
6
DIRECT INPUT BYPASSES FILTER
5
WARNING:TOREDUCETHERISKOFFIREORELECTRICSHOCK,DO
NOT EXPOSETHISAPPLIANCETORAINORMOISTURE.
R
POWER
ATTENTION:POURÉVITERTOUT RISQUEDEFEUOUCHOC
ÉLECTRIQUE,NEPASEXPOSERCET APPAREILÀLAPLUIEOUÀ
L'HUMIDIT É.
SERIAL NO.
OFF
120V ~ 60Hz 3A
INFINITY SYSTEMS INC. NORTHRIDGE, CA, USA
AMPLIFIER MADE IN CHINA
WARNING:SHOCKHAZARD-DONOTOPEN
NOUSERSERVICEABLEPARTSINSIDE
AVISRI
: SQUEDECHOCÉLECTRIQUENEPASOUVRIR
ON
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 with long-nosed pliers or similar tool.
3) Remove the (6) Phllips screws that are now exposed.
4) Remove the front baffle.
5) Remove the (6) screws that secure the driver.
6) To service the amplifier, remove the (10) Phillips screws at the rear of the enclosure, and pull
the amplifier out of the back. Remove the two Phillips screws as indicated in VIEW A to remove the rear cover.
VIEW A
9
Entra Subwoofer
Packaging
9
10
11
12
12
00472
13
10
Entra Subwoofer
Test Setup and Procedure
SIGNAL
GENERATOR
AC VOLT
METER (10V)
ENTRA SUB
UNDER TEST
SPEAKER LEVEL
INPUT
OUTPUT
R
+
+
L
L
_
_
_
_
R
R
+
+
LINE
LEVEL
INPUT
LEVEL
PHASE
CROSSOVER
FREQUENCY
80
DIRECT
M IN
180°
M AX
120
60
0°
50
150
DIRECT INPUT BYPASSES FILTER
AMPLIFIER
POWER
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
R
ATTENTION: POUR ÉVITER TOUT RISQUE DE FEU OU CHOC
ÉLECTRIQUE, NE PAS EXPOSER CET APPAREIL À LA PLUIE OU À
L'H UMIDITÉ.
SERIAL NO.
OFF
ON
120V ~ 60Hz 3A
WARNING: SHOCK HAZARD-DO NOT OPEN
INFINITY SYSTEMS INC. NORTHRIDGE,CA,USA
AMPLIFIER MADE IN CHINA
NO USER SERVICEABLE PARTS INSIDE
AVIS: RISQUE DE CHOC ÉLECTRIQUENE PAS OUVRIR
00473
OUTPUT FROM
GENERATOR/AMPLIFIER
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.
11
Entra Subwoofer
Electrical Parts List
Part
No.
Description
Designator
Quantity
PRE AMP PCB ASSEMBLY
Resistors
020-100498-120
020-100598-120
CARBON FILM RESISTOR 1K 1/8W J
CARBON FILM RESISTOR 10K 1/8W J
020-100698-120
020-110598-120
020-150598-120
020-180698-120
020-220698-120
020-330498-120
020-750498-120
021-100401-120
021-100598-100
021-154598-100
021-169598-100
021-200698-100
021-215598-100
021-280498-100
021-442598-100
021-511498-100
CARBON FILM RESISTOR 100K 1/8W J
CARBON FILM RESISTOR 11K 1/8W J
CARBON FILM RESISTOR 15K 1/8W J
CARBON FILM RESISTOR 180K 1/8W J
CARBON FILM RESISTOR 220K 1/8W J
CARBON FILM RESISTOR 3K3 1/8W J
CARBON FILM RESISTOR 7K5 1/8W J
M.O.F. RESISTOR 1K 1W J MO-100
METAL FILM RESISTOR 10K 1/8W F
METAL FILM RESISTOR 15K4 1/8W F (MF)
METAL FILM RESISTOR 16K9 1/8W F (MF)
METAL FILM RESISTOR 200K 1/8W F
METAL FILM RESISTOR 21K5 1/8W F (MF)
METAL FILM RESISTOR 2K8 1/8W F
METAL FILM RESISTOR 44K2 1/8W F
METAL FILM RESISTOR 5K11 1/8W F
R107,123,138
R136,127,121,
135,124,125
R133
R122
R118
R128
R126,129
R132,134
R110,112
R101,102
R109
R137
R120
R103,104,105,106
R111
R130
R131
R116,117
3
6
1
1
1
1
2
2
2
2
1
1
1
4
1
1
1
2
Capacitors
030-100247-300
CERAMIC CAPACITOR 0u1/50V Z P:5
030-220223-300
032-100243-301
032-220353-300
032-470353-303
034-100525-300
034-100614-300
034-100715-200
034-220515-300
CERAMIC CAPACITOR 220P/50V K P:5
PE CAPACITOR 0u1/63V J P:5m/m
PE CAPACITOR 0u22/63V J P:5m/m
PE CAPACITOR 0u47/63V J P:5m/m
ELEC. CAPACITOR 10uF/25V M (R) P:5
ELEC. CAPACITOR 100uF/16V M (R)2.5
ELEC. CAPACITOR PC 1000uF/16V M (R)P:5
ELEC. CAPACITOR PC 22uF/16V M (R) P:5
C110,109,121,122,
118,119
C105,106,107
C114
C104,108
C113,125,123
C102,103,120
C127,128
C124
C111
6
D101,102,103,
104,109
D110
Q102,103
Q101
IC102
IC101
IC103
5
3
1
2
3
3
2
1
1
Semiconductors
050-414802-100
DIODE 1N4148
050-505200-000
051-101501-000
051-181502-000
053-007200-000
053-007400-000
053-455801-000
LED P/N:UDC-5052W LED
TRANSISTOR PNP 2SA1015GR TO-92
TRANSISTOR NPN 2SC1815GR TO-92
IC TL072 CP DIP DUAL OP-AMP
IC TL074CN QUAD OP-AMP
I.C PC BA4558 (ROHM) DUAL OP-AMP
12
1
2
1
1
1
1
Entra Subwoofer
Electrical Parts List
Part
No.
Description
Designator
Quantity
Miscellaneous
072-010058-000
074-030002-000
083-031605-000
083-052618-000
026-200595-263
026-200595-264
RCA JACK 2P P/N:052000W1G(Red,White)
TOGGLE SW P/N L101
CONNECTOR LEAD WIRE #26 L:60mm #18 L:70mm
CONNECTOR LEAD WIRE EH2.5-7P+SCN2.5P+7
LEAD WIRE
VR P/N:R1210G-2A1-B20Kx2 10%
VR P/N:R1210N-2A1-B20K 10%
JK101
SW101
CN1
CN101
1
1
1
1
VR101
VR102
1
1
R511,714,719
R506,721,507,702
R503,610,504,510,
512,601,606
R712,725,731
R713,718,721
R607,709,711
R710,742
R502,508,701,703
R603
R715,717
R611
R723,724
R716
R602
R728
R505,604,605
R743
R734,735
R608,609
R726,730
R739
R727,729
R720
R513,509
R732,733
3
4
7
3
3
3
2
4
1
2
1
2
1
1
1
3
1
2
2
2
1
2
1
2
2
C718,707,708,719
C703,702,717,716
C712,713
C715,714,711,710
4
4
2
4
MAIN AMP ASSEMBLY
Resistors
020-100398-120
020-100498-120
020-100598-120
CARBON RESISTOR 100R 1/8W J
CARBON RESISTOR 1K 1/8W J
CARBON RESISTOR 10K 1/8W J
020-100698-120
020-150498-120
020-150598-120
020-220498-120
020-220598-120
020-220698-120
020-270398-120
020-270698-120
020-330297-120
020-390598-120
020-470498-120
021-470597-120
020-470598-120
020-560398-120
021-100003-020
021-100201-121
021-100397-120
021-100401-120
021-100496-120
021-330498-120
021-499698-100
021-680296-120
CARBON RESISTOR 100K 1/8W J
CARBON RESISTOR 1K5 1/8W J
CARBON RESISTOR 15K 1/8W J
CARBON RESISTOR 2K2 1/8W J
CARBON RESISTOR 22K 1/8W J
CARBON RESISTOR 220K 1/8W J
CARBON RESISTOR 270R 1/8W J
CARBON RESISTOR 270K 1/8W J
CARBON RESISTOR 33R 1/4W J
CARBON RESISTOR 6 39K 1/8W J
CARBON RESISTOR 4K7 1/8W J
M.O.F. RESISTOR 47K 1/4W J
CARBON RESISTOR 47K 1/8W J
CARBON RESISTOR 560R 1/8W J
M. O. F. RESISTOR 0R1 3WS J
M. O. F. RESISTOR 10R 1W J MO
M. O. F. RESISTOR 100R 1/4W J
M. O. F. RESISTOR 1K 1W J
M. O. F. RESISTOR 1K 1/2W
M. O. F. RESISTOR 3K3 1/8W J
METAL FILM RESISTOR 499K 1/8W F
M. O. F. RESISTOR 68R 1/2W J
Capacitors
030-100264-300
030-220223-300
030-220244-261
030-470344-200
CERAMIC
CERAMIC
CERAMIC
CERAMIC
CAPACITOR
CAPACITOR
CAPACITOR
CAPACITOR
0u1/100V K NPO
220P/50V K P:5
22pF/50V J NPO
PC 470pF/50V 10
13
Entra Subwoofer
Electrical Parts List (Cont.)
Part
No.
032-100393-300
034-100515-301
034-100615-301
034-100695-300
034-470415-300
034-470515-000
035-220143-100
035-220243-100
Description
PE CAPACITOR 0u1/63V J P:5
ELEC. CAPACITOR PC 10uF/16V M (R)0511
ELEC. CAPACITOR 100uF/16V M (R)0611
ELEC. CAPACITOR 100uF/63V M (R)1012
ELEC. CAPACITOR 4u7/50V M (R)0511 P:
ELEC. CAPACITOR 47uF/16V M (R)0511
PE CAPACITOR FE-M 0u0022/63V J P:5m/m
PE CAPACITOR FE-M 0u022/63V J P:5m/m
Designator
Quantity
C606,607,601,709
C701,723
C605
C720,721
C501,603
C502,604,704
C608
C503
4
2
1
2
2
3
1
1
D807
D710,711,601,
717, 712, 806
D501,713,715,716,
714,708,709
IC601
IC501,701
Q707
Q708
Q704
Q703
Q711
Q710
Q501,502,602,603
Q709
Q702,706,601
Q701,705
1
6
Semiconductors
050-003000-100
050-400201-100
ZENER DIODE 30V HZ-30-2 05000881
DIODE 1N4002 100V/1A TAPING
050-414802-100
DIODE 1N4148
053-123700-100
053-455801-000
051-003100-000
051-003200-000
051-046900-000
051-047000-000
051-066900-000
051-138600-000
051-181500-000
051-351900-000
051-540100-000
051-555100-000
IC PC UPC 1237HA LIMITER
I.C PC BA4558 (ROHM) OP-AMP
TRANSISTOR TIP 31C TO-220
TRANSISTOR TIP 32C TO-220
TRANSISTOR 4 BF469
TRANSISTOR BF470
TRANSISTOR 1 2SD669A (C class)
TRANSISTOR 2SA 1386(SANKEN) TO-3P
TRANSISTOR PC 2SC1815GR
TRANSISTOR 2SC 3519(SANKEN) TO-3P
TRANSISTOR 2N5401
TRANSISTOR 2N5551 TO-92
7
1
2
1
1
1
1
1
1
4
1
3
2
Miscellaneous
061-700011-101
072-040007-000
072-040039-000
072-040041-000
072-040206-000
073-014005-600
073-014006-600
074-300004-000
083-022547-000
025-050001-000
SLICON RUBBER PCS P/N:1877 110x30mm t=0.19mm
7P WAFER SWA101 BC501 JS-1001-07
TERMINAL (PCB) PC205 (t=0.8m/m)T205MA
TERMINAL(PCB) T250MA (P/N 0635R-BL2)
CONNECTOR P/N:3PIN JS-1001-4 P:2.5
BRACKET(LEFT SIDE) PCS 72x19m/m t=1mm
BRACKET(RIGHT SIDE) PCS 72x19m/m t=1mm
RELAY 48VDC P/N PCE-148D1H
CONNECTOR WIRE #18 VH3.96+SCN2.5
VARISTOR TSA-104
14
J602
J601
CON802
RLY601
CN302
TH601
1
1
1
1
1
1
1
1
1
1
Entra Subwoofer
Electrical Parts List (Cont.)
Part
No.
Description
Designator
Quantity
POWER SUPPLY PCB ASS’Y
Resistors
020-820497-120
021-470301-120
CARBON RESISTOR 8K2 1/4W J
MO RESISTOR 470R 1W J MB TYPE MO-100
R301,304
R303,302
2
2
C2,3
C309
C307
C305,306
C303,304
2
1
1
2
2
ZD301,302
Q301
Q302
2
1
1
BD2
CN30
1
1
1
1
2
1
2
1
Capacitors
030-100264-300
030-100295-201
034-220515-300
034-220615-301
034-470763-301
CERAMIC CAPACITOR 0u1/100V K NPO TAPING
UL SAFETY CAPACITOR YS-SC103Z2 10000pF/400V
ELEC. CAPACITOR PC,308 22uF/16V M (R)0511
ELEC.CAPACITOR 220uF/16V M (R)0611 P:5
ELEC.CAPACITOR 4700uF/63V M (R) 25*40
Semiconductors
050-001500-000
051-118900-100
051-677000-000
DIODE 15V 1/2W HZ15-3
TRANSISTOR 2SD882P(TO-220)
TRANSISTOR 2SB772 (TO-220)
Miscellaneous
052-602000-000
072-040032-000
073-032027-000
083-021805-000
083-022548-000
083-031603-000
091-000130-000
093-105203-300
RECTIFY DIODE KBU8D(SUB-100W) 8A/200V
WAFER 2 P:3.96 3P MALE VH
HEAT SINK PCS 40x24x2.0m/m
LEAD WIRE #22 GND WIRE L:80mm 5TT+5TT
LEAD WIRE #18 UL1015 PCS T187(t0.8)+ B1811T0P-2
4Px120mm CONNECTOR 1 LEAD WIRE #22 +5TT
FUSE HOLDER PCS P/N:CQ-203SP
FUSE:UL GSL(2AG) FUSE:3A,250V,5*20mm
CN30
F301
MISCELLANEOUS
005-009885-000
005-033420-000
008-068701-000
042-010042-000
061-020000-000
061-314002-000
061-800000-000
062-050400-000
062-261313-000
063-062512-000
066-120300-900
070-000030-410
070-040010-210
070-400010-206
070-400010-212
070-400010-812
GASKET 97.5x85x36cm
STYROFOAM 335.0x191.0x65.0mm
GASKET SM-55 GASKET 860.0x5.0 t=2.0mm
TRANSFORMER P/N:PT-1739
KNOB ABS HTS-10/20 p20x15m/m UL94V-0 BLK
CORD BUSHING P/N SB4F-2
TRANSISTOR COVER P/N:TW-1
PUSH TERMINAL 4P JK102A,JK102B P/N E405
BUCKET(HI PS 94VO)304.8x177.8x124.2m/m BLK
PLATE 304.8x177.8 t=2.5mm (SPCC)
CABLE TIE PCCV-120S
SCREW TRANSFORMERx4,HEAT SINKx6 M4;4x10m/m BLK
SCREW PC TRAN.x5,TH601x1,GROND WIREx1 PMS M3x10m/m BLK
SCREW PCB VS BRACKETx4,BRACKET VS HEAT SINKx23x6m/m BLK
SCREW 3x12m/m BLK
SCREW RCA JACKx1 PTS-4 3x12 BLK
15
1
40
2
1
2
1
2
2
1
1
3
10
7
6
1
1
Entra Subwoofer
Electrical Parts List (Cont.)
Part
No.
071-060031-400
071-100810-100
071-140031-901
072-050002-000
073-032306-600
074-020015-000
083-041600-004
Description
Designator
NUT WITH GEAR TRANS FOR MERx2 K-NUT 4p
FLAT WASHER PC TRANS FOR MERx4 ID=4.3 OD=9.5 t=0.8m/m
GEAR WASHER BACK PANEL VS GROUND WIRE M3 BLK
GROUND WASHER GROUND WIRE VS PANEL GND-1
HEAT SINK ALUM. 154x125x34mm
ROCKER SW 125V/5A P/N:R19-33A(SPST)PIN LOCK TYPE
AC CORD SPT-2 #16 12 FEET+5TT DOUBLE INSULATE
16
Quantity
2
4
1
1
1
1
1
Entra Subwoofer
Integrated Circuit Diagrams
17
Entra Subwoofer
Integrated Circuit Diagrams (Cont.)
µPC1237HA IC601
1
8
µPC1237HA IC601
OVERLOAD
DETECTION
1
MUTING
Vcc
7
8
Vcc ON
MUTE
OVERLOAD
DETECTION
RELAY
DRIVE
CIRCUIT
6
FLIP-FLOP
CIRCUIT
2
NEUTRAL
VOLTAGE
DETECTION
AC OFF
DETECTION
SWITCH for
LATCH AUTOMATIC
RESET
5
3
4
GND
SWITCH for
LATCH
AUTOMATIC
RESET
AC OFF DETECTION
18
00330
NEUTRAL
VOLTAGE
DETECTION
Entra Subwoofer
1
Block Diagarm
2
3
5
4
6
7
8
15K4
Direct
A
A
Nor.input
SPK IN
SPK OUT
INPUT MAX
+15V
+
PHASE
SW
R
-
B
15K
-
-
VARI. LPF
2rd order
DIR/NOR
MIXER
+
VOL
CTL
FIX LPF
2rd order
B
0°
-
HPF
2rd order
+
180 °
L
+
-15V
C
C
AC/DC
CONVERTER
LED
DIRVER
GEN
RED
D
D
CLAMPING
CIRCUIT
SPK.
DIRVER
CIRCUIT
SP.
F
00474
1
2
3
6
2
19
7
8
20
21
22
Entra Subwoofer
1
Preamp Schematic
2
3
4
5
6
7
8
10
9
A
A
JK101
R137
3
Direct
15K4
2
B
Normal
B
1
JK102:A
+
5
+
2
6
-
3
7
-
LCH
C
SPEAKER
IN PUT -
LCH
R101
1K 1W
R102
1K 1W
RCH
+
JK102:B
1
4
SPEAKER
OUT PUT
D103
1N4148
C
RCH
8
+
D104
1N4148
C110
3 4
6
R117
5K11
5K11
6
TL074
C113
.47u 63V
IC101:A
R118
5
7
TL074
15K
IC101:D
13
TL074
12
IC101:B
14
R109
10K
R111
21K5
C104
.22u 63V
C108
.022u 50V
9
8
R110
7K5
2K8
C109
.1u 63V
R122
11K
3
2
1
VR102
20KB
2
8
.1u 63V
SW101180
PHASE SW
R123
1K
6
CN101
+15V
TL072
IC102:B
R131
-15V
C127
100u 16V
44K2
C122
.1u 63V
4
D101
1N4148
C128
100u 16V
7
5
TL072
IC102:A
4
R124
10K
C125
.47u 63V
C123
.47u 63V
1
3
1
200K
R125
10K
4
R121
F
10K
3
2
10u 16V
1
8
R128
180K
L.L
BA4558
IC103:A
D109
1N4148
R132
R126
220K
C119
.1u 63V
R129
220K
2
G
1
1
R138
1K
D110
3
100K
Q102
A1015
F
10K
GRN
R133
1
C111
22u 16V
R135
3K3
3
G
5
L.L
10K
C120
.1u 63V
E
7
C118
D102
1N4148
C124
1000u 16V
3
6
Q101
C1815
R136
3
E
D
C121
0
TL074
IC101:C
3
C106
220P 50V
R106
R130
10K
VOLUME CONTROL
10
200K
R127
1
C103
10u 25V
R105
1
2
200K
11
R116
R120
16K9
C114
.1u 63V
1
R104
1
3
20KB
2
C105
220P 50V
4
VR101:B
20KB
3
200K
2
VARIABLE LPF
VR101:A
2
R103
R112
7K5
2
D
C102
10u 25V
2
R107
1K
.1u 63V
5
C107
220P 50V
Q103
A1015
R134
2
RED
3K3
H
H
1
2
3
4
5
6
23
7
8
9
10
Entra Subwoofer
Power Amp Schematic
C
D
V+
+15V
IC501:A
BA4558
3
R607
15K
2
2
Q501
2SC1815
R504
10K
R506
1K
Q502
2SC1815
1N4148
D501
R505
47K
+
-
C701
10u 16V
8
R502
22K
D806
1N4002
C702
220p
R701
22K
-15V
R508
22K
C502
47u 16V
R507
1K
R702
1K
1
4
AC1
R712
D713
1N4148
R710
2K2
1
+
C708
D715
1N4148
.1u
(C)
39K
C713
22p
R509
R511
100
499K
7
6
5
IC501:B
BA4558
R510
10K
10u 16V
C721
100u/63V
R512
C719
.1u
(C)
1N4148
R728
Q702
2N5401
R711
15K
D710
1N4002
Q709
R732
68 1/2W
R734
.1 3W
R733
68 1/2W
R735
.1 3W
R609
10 1W
J601 CON601
RLY601
D601
1N4002
R729
1K 1/2W
C711
470p
R730
100 1/4W
220p
R731
100K
C717
C606
.1u
(PE)
R608
10 1W
J602
2
Q710
Q708
33 1/4W
Q704
BF469
470p
D709
1N4148
D717
1N4002
R724
C715
-15V
C723
2N5551
Q706
2N5401
R726
100 1/4W
R727
1K 1/2W
D708
470p
Q705
R721
1K5
R717
270
Q707
D712
1N4002
C710
D714
1N4148
C709
.1u
(PE)
Q711
R715
270
R716
220p
R723
D716
1N4148
+15V
C503
.022u
(PE)
R720
3K3
C716
R725
100K
33 1/4W
470p
2N5551
-15V
C707
IC701:A
BA5532 .1u
2
- (C)
3
C714
Q701
100K
Q703
BF470
2SC3519
C704
47u 16V
R503
10K
4
-15V
C501
4u7 50V
C712
22p
R709
15K
8
R743
560
+15V
+15V
1
JP1
JUMP
R714
100
R713
1K5
F
2SA1386
C703
220p
BC501
7 6 5 4 3 2 1
C718
.1u
(C)
C720
R703
22K 100u/63V
TIP31F
R742
2K2
2SD669
1
E
V1+
TIP32F
B
47K 1/4W
A
D711
1N4002
R719
100 JP2
JUMP
R718
1K5
10K
V-
R513
499K
V1-
IC601
UPC1237HA
4 5 6 7
3
3
2
Q601
R602
2N5401
4K7
R604
47K
.0022u (PE)
R603
220K
1
R601
10K
C608
C601
.1u
(PE)
C605
100u 16V
C607
.1u
(PE)
TH601
TSA-104
R739
1K 1W
D807
30V
8
V+
3
C603
4u7 50V
C604
47u 16V
R605
47K
R606
10K
R610
10K
Q602
2SC1815
4
4
R611
A
B
C
Q603
2SC1815
00303-2
270K
D
24
E
F
Entra Subwoofer
Power Supply Schematic
2
1
3
4
5
A
6
7
8
A
1
2
3
CON302
V+
B
1K1W
S1
C309
C
U3
0.01u/250V
B
Q301
R303
2SD882
C307
R304
F301
2 2L1
T3A/250V
10
12
L
N
BD2
8K2
C303
13
22U/16V
C2
0.1u
4700u/63V
C305
220/16V
CON301
2
14
AC PLUG
5
16
KBU8D
C
1
ZD301
HZ15-3
C3
0.1u
C304
4700u/63V
C306
220/16V
3
ZD302
HZ15-3
4
R301
C308
22U/16V
3
8K2
D
1K 1W
D
1
2
R302
2SB772
Q302
E
E
00319
1
V-
2
3
6
25
7
8