Infinity ENTRA User manual

ENTRA
ENTRA POINT FIVE HTS
POWERED SUBWOOFER
SERVICE MANUAL
Infinity Systems, Inc.
250 Crossways Park Dr.
Woodbury,NewYork11797 Rev212/2002

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

Entra Subwoofer
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
Entra Subwoofer
4

Entra Subwoofer
5
Controls and Connections

Entra Subwoofer
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Controls and Connections (Cont.)

Entra Subwoofer
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Operation

Entra Subwoofer
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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 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
REMOVE
THESE
SCREWS
INFINITY SYSTEMS INC. NORTHRIDGE, CA, USA
DIRECT
DIRECT INPUT BYPASSES FILTER
WARNING:TOREDUCETHERISKOFFIREORELECTRICSHOCK,DO
NOTEXPOSETHISAPPLIA NCETORAINORMOISTURE.
ATTENTION:POURÉVITERTOUT RISQUEDE FEUOUCHOC
ÉLECTRIQUE ,NEPASEXPOSERCETAPPAREILÀLA PLUIEOUÀ
L'HUMIDITÉ.
AM PLIFI ER MA DE IN CHINA
R
SERIALNO.
SPEAKER LEVEL
INPUT
_
+
R
L
_
+
R
+
_
OUTPUT
L
_
+
LEVEL
LINE
INPUT
WARNING:SHOCKHAZARD-DONOTOPE N
NOUSERSERVICEABLEPARTSINSIDE
AVIS:RISQUEDECHOCÉLECTRIQUE-
NEPASOUV RIR
1 20V ~ 60 Hz 3A
OFF
POW ER
ON
FRE Q UENCY
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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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
AMPLIFIERMADEINCHINA
INFINITYSYSTEMS INC.NORTHRIDGE,CA,USA
R
WARNING:SHOCKHAZARD-DONOTOPEN
NOUSERSERVICEABLEPARTSINSIDE
AVIS:RISQUED E CH OC ÉLECTRIQUE-
NEPASOUVRIR
WARNING:TOREDUCETHERISKOFFIRE OR ELECTRICSHOCK,DO
NOTEXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
ATTENTION: POURÉVITERTOUTRISQUEDE FEUOUCHOC
ÉLE C T R IQ U E, N E PA S EX POSE R C E T APPA RE I L À LA PL U IE OU À
L'HUMIDITÉ.
SERIALNO.
OFF ON
120V ~ 60Hz3A
POWER
R
+
_
+
_
L
OUTPUTINPUT
DIR E CT INP U T B Y PASSES F ILTER
LEVEL
00473
R
DIRECT
+
_
MIN
+
INPUT
LINE
LEVEL
_
L
120
CROSSOVER
80
60
180°
MAX
0°
50150
PHASE
FREQUENCY
R
SPEAKERLEVEL

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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 arts List
art 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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Integrated Circuit Diagrams

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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
18

Entra Subwoofer
19
Block Diagarm
F
21 345678
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