SERVICE MANUAL
Contents
1. OPERATION 1 Set the subwoofer s Level control 3 to 12 o clock 2 Set the subwoofer s Low Freguency Rolloff control 2 to 12 o clock 3 Switch the subwoofer s A C power switch 6 to the ON position 4 Turn on your entire audio System 5 Listen closely to the subwoofer You should be able to hear a slight amount of noise coming from the speaker If not slightly increase the volume control of your preamplifier or receiver Carefully turn up the subwoofer s Level control 3 until you hear noise or a slight hum Now turn the Level con trol on the subwoofer back to the 12 o clock position If you cannot hear noise or hum from the subwoofer check the A C line cord 15 it connected to a live A C receptacle Is it making proper contact 6 Once you have confirmed the subwoofer is active proceed by playing a CD record or cassette Use a selection that has ample bass information 7 Set the overall volume control of the entire system to a comfortable level Begin with the subwoofer s Frequency 2 and Level 3 controls at the 12 00 position Adjust the sub woofer s Level contro 3 until you obtain a pleasing blend of bass Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range Many users have a tendency to set the subwoofer level too loud following the belief that a subwoofer is there2. ae LOW LEVEL INPUTS When using a single subwoofer you must use a stereo pair of low level leads from your preamp s outputs When using two subwoofers one for each channel connect the left channel preamp out to both the Left and Right Low Level Input jacks of the subwoofer on the left by using a Y con nector at the subwoofer s amplifier and the right channel preamp out to both jacks of the subwoofer on the right in the same manner See figure 5 Figure 5 uus ks ETE NE S a BoE LOW LEVEL INPUTS INPUTS 2 The subwoofer may be connected by using its High Level Inputs 4 in either of two ways a If your subwoofer is near your power amplifier receiver and the amplifiers speaker outputs are readily acces sible you can connect the speaker outputs to the high level inputs of the subwoofer as shown in figure 6 b Connect to the amplifier receiver as stated above while tapping off the high level outputs from the power source as shown in figure 7 You may use wires as thin as 22 gauge for these con nections Maintain proper polarity to to at all con nections Figure 6 SPEAKER OUTS AMPLIFIER TO SATELLITE SPEAKERS LOW LEVEL Figure 7 SPEAKER OUTS AMPLIFIER Bigi RIGHT CH SAT SAT REAR REAR
3. 6 x 3 4 PPH BLK ENML AB 12 801 4424 AMP GASKET 844 4207 lt 2 lt lt QL NYCZ 0 AN 000 K Q NILE e 9 A 10 52 25 10 OA M i N gt 20 M 0 AA Ad 9 9 56 REVISIONS DESCRIPTION APPROVED A RELEASE FOR PRODUCTION ADD SCRIM CLOTH SCRIM CLOTH 676 1428 0 ON 5 KW 22 5 We 9 AA R 5 W NO NS gt 96 144444 0 55 AX gt SX 2 ne YV 2 i w 5559 LY 800 W SN 9 NAN ONY lt gt 4 lt 252 es KS DNI N VVVV 511 10 05070 AN 3 N o MY EN CX e N 59 W SY 4 M CA Xe x 0 y ONY s i 3 e 9 6 i 0 ANNI OO e M 6 A OO 2 m 5 WY 959996 AWAQ WA AY R 1 0 7 Q SAN 220 55 QUU W 0 A 5 59 9 gt NO X 25 M 5 f ACO 22 6 6 4 2 s v MK 5 e NY ONY gt SA 06 M t Q ROY R 4 AW li A f 0
4. gt lt v M v Y M QS A A ae 30 2 Z Se e AC WA 0 a ie 0 LS 9 AY N 40 W lt gt 2 SC 0 NOTES 1 FILL CABINET WITH 250 gms OF DACRON 875 1121 2 ATTACH AMP GASKET 844 4207 TO AMP DATTO IN CABINET ENCLOSURE ALIGNING SCREW HOLES 3 PLACE SCRIM CLOTH 676 1428 UNDER AMPLIFIER PASSING ALL CONNECTING WIRES THROUGH HOLE IN CLOTH 4 CONNECT THE FOLLOWING WIRES DRIVER POLARITY WIRE COLOR WOOFER RED RED BLK 5 INSERT FOUR HOLE PLUGS 840 1484 INTO FEET HOLES 6 WOOFER TO BE MOUNTED WITH CLIPS ORIENTED TOWARDS AMPLIFIER 7 SERIAL NUMBER 967 4196 TO BE PLACED ON AMPLIFIER BETWEEN WARNING AND ADDRESS LABELS Infinity Systems Inc RS SUBWOOFER FINAL ASSEMBLY P N N A OWG NO N A DRAWN BY M MENZOR DATE 08 16 89 SCALE 1 2x APPROVED 2 MATERIAL SEE NOTES FINISH SEE NOTES Ma TOLERANCES ANG 5 FRACT t 1 3 DECIMALS 01 k 005 DEVISION SSW 10 subwoofer Infinitesimal IV subwoofer Servo Controlled subwoofer RS Subwoofer Electrical Mechanical Parts Lists For amplifier assemblies Note These parts lists may contain some part numbers that are not valid or No Longer Available Descriptions and Reference Designato
5. 1 HEX NUT 1 4 20 BLACK INF P N 810 0929 QTY 2 KEP 10 32 BARRIER STRIP NUT INF P N 814 5357 QTY l KEP NUT 4 40 ZINC GROUND INF P N 814 5978 CONNECTORS QTY 1 205 FAST ON TERMINAL FML 020 THK BRASS INF P N 542 2695 4 1250 FAST ON TERMINAL FEMALE 032 THK QTY 7 205 FAST ON TERMINAL FML 020 THK TIN INF P N 542 4884 1 125 I D RING TONGUE TERMINAL QTY 1 MOLEX OR EQUIV CONNECTOR ASSY INF P N 639 6382 PART A MOLEX P N 03 09 2022 MALE PLUG MOLEX P N 02 09 2103 MALE TERMINAL QTY 1 MOLEX OR EQUIV CONNECTOR ASSY INF P N 639 6383 PART MOLEX P N 03 09 1022 FEMALE RECEPTACLE MOLEX P N 02 09 1104 FEMALE TERMINAL 30 88W 10 CONT REV D FEBO oT IE ING FRUPRIETARY This document contains confidenti onfidential 9 1993 and proprietary information that is the property of Infinity Systems Inc and may not disclosed to or duplicated for others except as auth orized by Infinity Systems Inc MISCELLANEOUS NON BOARD MOUNTED COMPONENTS NTC THERMISTOR US SENSOR P N 5510004 KNOBS CULVER 21 INF P N 710 1979G TRANSISTOR MOUNTING PLATE INF P N 707 5159 TH2 OTY OTY OTY OTY OTY OTY OTY OTY OTY OTY OTY OTY PUPPPRPHPP kk INTERCHANG AC CONNECTOR SCHURTER P N 4303 1091 EABLE FUSEDRAWER S
6. SPST RELAY ITT TAKAMISAWA 1224 14 PIN SOCKET FOR 5 PIN FRICTION LOCK HEADER MOLEX P N 22 23 2051 P N XXX XXXX INFINITY 5757 5 ING PROPRIETARY This document contains confidential and proprietary information that is 0 9 1993 the property of Infinity Systems Inc PCB 2 021 5158 SSW 10 CONT REV D and may not be disclosed to or duplicated for oth rs except as auth RESISTORS orized by Infinity Systems Inc 1 4 WATT TOL 1 METAL FILM 25 813 814 817 818 100 0K N Ris BI6 R IS DO0 M dw bom e ud oec SR A 21 amp 22 amp 23 824 51 1 0 Cp MP 0 sae DN eat or a BI a W rao BOER R28 Lao W 20 45 2525 Oe te eee RSO ROL a w decks Wet 8 ao Bio R33 sm Ja M c wow ATIKA CAPACITORS a gt CERAMIC DISK TOL 10 RADIAL LEAD C12 220pF 100V ELECTROLYTIC 20 TOL 20 DF RADIAL LEAD C30 C31 5 54044 9 ul 7 9 o9 w s 35V POLYESTER FILM 5 TOL RADIAL LEAD C13 a e 0 47uF 100V Cis CIS EL cox SQ OL UE 1067 CIBC Rods Ar e wos cb Wee EUM m Ar He ana SUE
7. Si MATERIAL 39 FINISH 31V R47 C22 2 2K 0 22 RE VISIVINS ECO REV DESCRIPTION DATE OUTER CARTON BLACK SEE SHEET 1 OF 2 946 50318 APPROVED ASSEMBLED SPKR GRILLE ASSEMBLY W LOGO 14 1 2x13 1 2 PL BAG 026 5045 OR 026 5045A 955 5483 BARCODE LABEL TY WRAP A B61 4914 958 5351 NOTES 1 PLACE A BOTTOM FOAM PAD 951 5038 ON THE CONVEYOR 5 1 2 14 1 2 PL BAG WARNING TAG FOOT BLK PLSTC 1 1 2 X 1 3 4 4 2 BAG ASSEMBLED SPEAKER WITH PLASTIC BAG 955 5482 846 4431 955 5483 3 ATTACH WARNING TAG 958 4466 TO THE LINE CORD 4 GRILLE WITH PLASTIC BAG 955 5482 AND SEAL WITH TAPE PLACE CABINET AND GRILLE ON BOTTOM PAD AS SHOWN PLACE OWNER S MANUAL 930 5025 OR 930 50257 OR 930 5025A ON TOP OF SPEAKER PLACE A TOP FOAM PAD ON TOP INSERT FOUR PLASTIC FEET 846 4431 IN THEIR CAVITIES PLACE LINE CORD 615 5141 IN RECESS 036 5024 AMP ONLY PLACE CARTON 946 5031B OVER UNIT CLOSE FLAPS ANO TAPE 960 1425 10 TURN UNIT OVER FOLD BOTTOM FLAPS AND TAPE ATTACH SERIAL NUMBER AND BAR CODE LABEL 958 5351 TO CARTON POWER CORD LE C 615 5141 WITH 036 5024 AMP m 2 951 5038 SERVO CTRL SUBW ER
8. 50V CAPACITORS CONT POLYESTER cig C20 C21 C22 C23 FILM 5 C25 c29 C37 C40 C41 INTEGRATED CIRCUITS IC3 TRANSISTORS Q1 Q2 Q3 Q11 Q4 05 06 012 013 014 015 DIODES ZENER 201 202 GERMANIUM D14 D15 SILICON D3 D9 D10 FEB 0 9 1993 10 CONT REV TOL RADIAL LEAD QUAD OP AMP LF347 D4 D5 D6 D7 D8 D11 D12 D13 D16 17 RECTIFIERS D1 D2 POTENTIOMETER VR3 VR4 MISCELLANEOUS BOARD MOUNTED COMPONENTS 1 RLA1 OTY 1 OTY 1 NTC THERMISTOR 28 INFINITY SYSTEMS ING PROPRIETARY This document contains confidential and proprietary information that is the property of Infinity Systems Inc and may not be disclosed to or duplicated for others except as auth orized by Infinity Systems Inc 0 47uF 0 068uF 0 047uF O 22uF 0 022uF 0 luF 1nF 100V 100V 100V 100V 100V 100V 100V NO LONGER USED NAT L SEMICONDUCTOR OR EQUIV 25 2389 ROHM OR EQUIV 25 2061 ROHM OR EQUIV 2SA1038 ROHM OR EQUIV 2SB1186A ROHM OR EQUIV MPSA12 MOTOROLA OR EQUIV 2SD1763A ROHM OR EQUIV BD911 SGS OR EQUIV BD912 SGS OR EQUIV TIP35C SGS OR EQUIV TIP36C SGS OR EQUIV ZEE 1N5246B SG con 1N270 Vu 5 AN 4004 aasa tal s w INA 148 u FEP16DT FEN16DT e TRIM POT 20K Q 100K OHM 25 C 10K OHM 85
9. 40 T3 RS REL x Infinity Systems nc SERVO SUBWOOFER AMPLIFIER SERVO BOARD FABRICATION DRAWING P N 021 5152 DWG 021 5152 01208 36D DRAWN BY R RAHL i SCALE 2 APPROVED RP deo MATERIAL SEE FINISH SEE NOTES TOLERANCES ANG 5 FRAGT 1 37 DECIMALS XX 01 005 REVISION B page 2 of 3 22 MAGNET WIRE 19 MAGNET WIRE BLUE VIOLET BLACK PINK BLUE RED FEMALE TERMINATIONS WIDTH 205 THICKNESS 032 4 PL WIDTH 250 THICKNESS 032 DIAGRAM A INFINITY SYSTEMS INC P N 415 5155 REV E DATE CODE OR SERIAL NUMBER 35 FAST ON FEMALE TERMINATIONS REVISIONS A RELEASE FOR PRODUCTION 08 24 90 GS B ADD NOTE 6 863 4 863 CHG NOTE 6 ADD NOTE7 05 08 9 o Re ADD NOTES 8 9 10 CHG NOTE 1 07 24 91 O CHG NOTE 1 3 4 amp 10 ADDED TERMINALS REMOVED ONE WIRE ORG ADDED 1 TOL VIO 240V 74 TURNS OPEN CIRCUIT 22 VAC 1 BLU PINK 220V 367 TURNS 81 TURNS RED 120V 0 VAC 15 37 TURNS 81 TURNS MAGNET WIRE YEL 100951 22 1 367 TURNS de onidential LEAD WIRES ano proprisisrv information that is Bi w 1 A the property of Infinity Systems Inc and may not be disclosed to or duplicated for others except as auth 116
10. 876 5191 ONE TO RIGHT SIOE OF ENCLOSURE AND THE SECOND PIECE MUST HAVE X CUT IN THE MIDDLE TO FIT OVER ASSEMBLED PORT TUBE SITTING ON BOTTOM OF ENCLOSURE WITH HOT MELT ATTACH AMP GASKET 844 4207 TO AMP STEP ROUT IN CABINET ENCLOSURE ALIGNING SCREW HOLES PLACE AMP ENCLOSURE 760 4490A OVER AMPLIFIER 036 4228B OR 036 5024 PASSING ALL CONNECTING WIRES THROUGH HOLE IN ENCLOSURE SEAL AMP ENCLOSURE SPEAKER WIRE HOLE CONNECT SPEAKER WIRE SUPPLIED WITH AMP CONNECT THE FOLLOWING WIRES DRIVERS POLARITY WIRE COLOR WOOFER RED RED BLK WOOFER TO BE MOUNTED WITH CLIPS ORIENTED DOWN SERIAL NUMBER 958 5351 BE PLACED ON AMPLIFIER ABOVE CAUTION NOTICE SEE DETAIL A ATTACH MODEL LABEL 958 5263 CENTERED ABOVE AMP SEE DETAIL B PLACE C L A LABEL 958 5270 APPROXIMATELY WHERE SHOWN DETAIL A SCALE 1 2x Qo Infinity Systems Inc FINAL ASSEMBLY 1 9970058 DWG 1 9970058 01148 360 DRAWN BY MENZOR DATE 11 06 90 SCALE 1 4x APPROVED JI 12 14 90 MATERIAL SEE NOTES FINISH SEE NOTES SERVO CNTRL SUBWFR DECIMALS XX 01 XXX 005 DEWVISI N Dn SH 1 OF 2 TOLERANCES ANG 5 FRACT 1 3 8 x 1 ALN CAP BLK 4 801 4096 WOOFER 10 IMG 902 4208 HOLE PLUG 4 840 1484 CABINET ENCL RS SUBWOOFER 010 4223 SERIAL NUMBER
11. PACKING ASSEMBLY P N IF997005B DWG IF9970058 01148 56D DRAWN BY M MENZOR OWNER S MANUAL 930 5025 OR DATE 12 11 90 SCALE 1 4x 930 5025Z OR APPROVED 930 50254 MATERIAL SEE NOTES FINISH SEE NOTES TOLERANCES ANG 5 1 32 DECIMALS 01 XXX 005 REVISION D sa 2 or 2
12. inconjunction with VR1 A VRl B the Low Pass freguence control is achieved The Low Freguency Level control is achieved by the use of a 20K ohm pot VR 2A VR 2B At this point the signal is sent to the Servo Control System C14 C15 047 0047 004 eee rbM F P CIRCUIT DESCRIPTION cont d HIGH LEVEL INPUT The High Level inputs are controlled by the Balancing and IC1 D They are summed together at IC1 B at this point the signal path is the same as the Low Level Inputs CIRCUIT DESCRIPTION cont d SIGNAL FLOW CHART INPUT INPUT LOW PASS FREQUENCY CONTROL LOW PASS LEVEL CONTROL SUMMING LOW PASS CIRCUIT FILTER WOOFER OUTPUT POWER SUPPLY FLOW CHART POWER VOLTAGE VOLTAGE POWER TRANSFORMER al SUPPLY DIVIDER COMBINER PROTECTION FILTER 16V RAIL 31V CIRCUIT 10 THEORY OF 7 OPERATION NO Infinity To understand the workings of the Servo or the velocity bridge servo action of the Servo Control Subwoofer We must first begin buy referring to fig 1 This represents the fundamental way to look at how a velocity bridge works It should be noted that the elements are arranged in a typical bridge topological arrangement The active speaker and it s current sampling resistor form one arm of the bridge and the dummy speaker and it s sampling resistor form the other arm of the bridge This dummy spea
13. on A R2 amp R3 4300 1watt resistors are burnt up or discolored problem is most likely defective ICI and IC2 on PC 2 the small input board OR one or both of the zener diodes in the power supply B To check replace R2 amp power up unit and check DC voltages across R2 8 R3 it should be 11 14 VDC If voltage is higher remove socketed ICI and IC2 LF347N 8 LF353N on PC 2 the small input board or unsolder 5 conductor ribbon attaching PC 1 to PC 2 If no change in voltage on R2 replace ZDI on R3 replace ZD2 If voltage is normal OR drops to normal after IC removal unsoldering ribbon replace ICI and IC2 on PC 2 the small input board If the IC s are in sockets the latest model it will be easy if not the two IC s must be desoldered and removed without damaging the rest of the board IC sockets are recommended for the new IC s Or replace PC 2 in its entirety Infinity part A021 5158 C R2 8 look normal follow instructions B above concerning DC voltage across R2 8 R3 If all voltages are normal replace ICI and IC2 LF347N amp LF353N on PC 2 the small input board A021 5158 NOTE If PC 1 board is badly burnt because of R2 amp R3 it is considered contaminated and should be replaced in its entirety Infinity part A021 5152 RELAY IS NOT CLOSING A Follow complete instructions B above RELAY IS CLOSING NORMALLY concerning DC voltages across R2 amp R3 A short in ICI IC2 or IC3 will prevent t
14. 545 5994 SWITCHES QTY 1 DPST SWITCHCRAFT P N 360B5NN OR EQUIV INF P N 507 5967 WIRES c 5 CONDUCTOR RIBBON 95mm INTER BOARD CONNECTION 24 AWG 14 AWG RED 280mm SPEAKER TERMINAL WIRE PCL 34 14 AWG RED BLACK 280mm SPEAKER TERMINAL WIRE PC1 J5 14 AWG RED 300mm SPEAKER TERMINAL WIRE MOLEX SPKR 14 AWG RED BLACK 300mm SPEAKER TERMINAL WIRE MOLEX SPKR 16 AWG RED 55mm SWITCH IEC WIRE POSITIVE 16 AWG BLACK 65mm SWITCH IEC WIRE NEUTRAL 16 AWG GREEN 25mm SWITCH IEC WIRE GROUND 18 AWG RED 228mm LED WIRE PC1 LED1 ANODE 18 AWG BLACK 228mm LED WIRE PC1 LED1 CATHODE 20 AWG WHITE 114mm POS BARRIER STRIP WIRE PC2 22 20 AWG WHITE BLACK 114mm NEG BARRIER STRIP WIRE PC2 21 20 AWG BLUE 114mm POS BARRIER STRIP WIRE PC2 74 20 AWG BLUE BLACK 114mm NEG BARRIER STRIP WIRE PC2 J3 SCREWS NUTS WASHER QTY 4 SCREW 4 40 x 1 2 PPH SPEC BLK IEC CONN RCA INF P N 800 5971 QTY 2 SCREW 10 32 x 3 4 PPH BARRIER STRIP INF P N 800 5356 QTY 3 SCREW 8 32 x 3 4 PPH SPEC BLK TRNSTR BRKT INF P N 800 5161 QTY 1 SCREW 1 4 x 20 x 3 PPH SPEC BLK INF P N 800 5156 QTY 1 LOCKWASHER SPLIT 1 4 BLK INF P N 827 0943
15. to produce lots of bass This is not entirely true A subwoofer is there to enhance bass extending the response of the entire system so the bass can be felt as well as heard However overall balance must be maintained otherwise the music will not sound natural An experienced listener will set the level of the subwoofer so its impact on bass response is always there but is never obtrusive 8 The frequency control 2 sets the frequency at which the subwoofer rolls off adjustable from 50 to 200 Hz The setting of this control depends on the low frequency capabilities of your satellite speakers system placement and other factors affecting the mid bass region Turn the control UP clock wise until you feel there is too much mid bass information around 100 Hz then back the control down a bit until that area sounds more natural you are pleased with the mid bass but want to hear more low bass turn the Freguency control DOWN a bit and the Level control UP by about the same amount This will increase low bass while leaving the mid bass sounding the same as it did before the adjustment 4 LEFT CH To get a reduction in low bass without changing mid bass turn the Freguency control UP and the Level control DOWN 9 Room placement of the subwoofer is the most critical aspect of its installation It will be necessary for you to try var ious locations in your listening room before you choose the final location Some possible starting po
16. 011 012 015 014 015 CHECK MISSING 5 OK CHECK 04 05 06 OK MISSING MISSING REPLACE 07 08 09 010 011 012 013 014 015 23 SIGNAL MISSING AT IC 1 OK REPLACE VR 1 CHECK INPUTS TRIM RING 2 760 5205 6 x 17 PPH BLK 12 801 4038 OR 8 x 17 PPH BLK 12 801 3965 BONDED POLYFIBER 2 876 5191 PORT TUBE 653 5204 AMP ASSY SPEAKER WIRE WITH CONNECTOR SUPPLIED WITH AMP ENCLOSURE 760 4490A GASKET AMP 844 4207 CABINET ENCLOSURE 010 49688 WOOFER 10 IMG 902 5320 DETAIL B SCALE 1 2x 13 24 R DESCRIPTION DATE APPROVED RELEASE FOR PRODUCTION 12 06 90 J l 02 07 91 DELETE RICHTERFOAM AND ADD PLASTIC TUBES 815 FOR CAB AND GRILLE CHG TO CLEAR 74 29 9 29 868 ADD MODEL LABEL SEE DETAIL B 787 ADD DATE CODE LABEL 958 5351 ji 874 E PLSTC BAG WAS 30 PLSTC TUBE 13 x14 PLASTIC BAG WAS 14 PLASTIC TUBE 1332 D DEL 800 4486 DEL 939 4811 TALE NOTES JA 2 3 WN 801 4096 2 1 4 ASSEMBLE PORT TUBE 653 5204 AND 2 TRIM RINGS 760 5205 HOT MELT INSERT ASSEMBLED PORT TUBE THROUGH AMP CUTOUT INTO BOTTOM HOLE SECURING IT WITH HOT MELT ATTACH TWO SHEETS OF BONDED POLYFIBER
17. CHURTER P N 4303 2114 01 BOTH PIECES COMBINE INTO INFINITY P N 539 5349 INSULATOR CRAYO THERM INF POWER CORD TUMBLER 3271366 INF TRANSISTOR MOUNTING CARDBOARD INF 2 FUSE 250V 3A BUSS ELECT P N GMC 3A INF FUSE 250V 1 5A BUSS ELECT P N GMC 1 5A INF P N 870 5354 CHASSIS PLATE SBWFR AMP ASSY INF TYWRAP 4 08433 BLACK INF 2 5 PIN CRIMP TERMINAL HOUSING MOLEX P N 14 60 1053 INF P N 31 P N_731 5160 P N 615 5141 P N 950 5178 P N 870 5150 P N 045 5194 P N 861 1499 SEMICONDUCTOR PART NUMBERS 306 0798 306 0805 306 8042 306 8043 307 8039 325 4258 325 6548 306 3891 306 3898 347 3982 347 3989 347 8024 347 8025 347 8127 2050 238900 2050 103800 347 8029 347 8030 347 8033 MISC 510 8084 146 5127 870 5150 870 5354 539 5349 123 8038 545 5994 615 5141 1N4004 DIODE 1N4148 DIODE FEP16DT DUAL DIODE FEN16DT DUAL DIODE IN5246B 16V ZENER DIODE LF347N IC QUAD OP AMP LF353N IC DUAL OP AMP 2N4403 TRANSISTOR 2N4401 TRANSISTOR TIP 36C TRANSISTOR TIP 35C TRANSISTOR BD911 TRANSISTOR BD912 TRANSISTOR 2562061 TRANSISTOR 2502389 TRANSISTOR 25 1038 TRANSISTOR 25D1763A TRANSISTOR 25B1186A TRANSISTOR MPSA12 TRANSISTOR SPEAKER SPST ITT LZ24V RELAY LEVEL amp LOW FREQ POT 20K X2 FUSE 120V 5 X 20mm 3A SLO BLO GMC FUSE 230V 5 X 20mm 1 5A SLO BLO GMC 120V FEMALE PLUG SOCKETASS Y w FUSE DRAWER 430 OHM 1 WATT RESISTORS R2 R3 HIGH LEVEL
18. E 12 20 90 SCALE 3 51 APPROVED MS sw MATERIAL N A R45 FINISH N A po VRS E M Wi wma 0 068 cw BE u e ATR EEE a cut m RZEKA vj 3 REVISION B REVISIONS REV _ DESCRIPTION DATE APPROVED RELEASE FOR PRODUCTION 09 22 89 RP 643 cuc RG FROM 10k TO 2k ADD R82 4 OHM 158 sz 09 22 89 EE C MODIFY TO PRODUCTION SPECIFICATIONS 12 12 gt RELAY 31V 100240 V 110 220 V A C SINGLE PHASE LEFT INPUT HIGH LEVEL INPUT 1 LEFT 1 HIGH LEVEL OUTPUT 12 220pF C14 15 R22 R25 1 100K 047 0 047 0 047 HIGH LEVEL INPUT 1 RIGHT i DZ 1N4148 PCB 1 NOTES 1 ALL R s IN OHMS 1 4 WATT CARBON FILM 5 2 ALL CAPS MICROFARADS 3 en 3 je FRONT PANEL CONTROLS 2541038 1N4004 EN 5 1K R57 gt UNLESS OTHERWISE SPECIFIED 9 Infinity Systems Inc QB 04 R48 R70 R ps 27 m RS Subwoofer SCHEMATIC AMPLIFIER RZ X 2 gt a pio 0 1 SPEAKER 2541038 inaoos 2579 DWG 036 4228 00973 34 OL RR DRAWN BY R RAHL Ka 80912 PS 20K DATE 08 07 8 SCALE N A 54 RZ APPROVED
19. INPUT BLOCK PLASTIC 6 POWER CORD 32 REVISIONS REV DESCRIPTION RELEASE FOR PRODUCTION rd ST HEADER c O O BBE INFINITY SYSTEMS INC x x x x 3 96 NOTES 1 THIS CIRCUIT BOARD 021 5158 IS USED IN CONJUNCTION WITH CIRCUIT BOARD 021 5152 TO CREATE AMPLIFIER ASSEMBLY 038 5024 2 CORRESPONDING SCHEMATIC DRAWING NUMBER 036 5024 01157 36D REVISION 5 CORRESPONDING DRILL CHART DRAWING NUMBER 021 5158 01182 36D REVISION A Qo Infinity Systems Inc SERVO SUBWOOFER PC 2 INPUT BOARD P N 021 5158 DWG 021 5158 01179 36D DRAWN BY R RAHL SCALE 2 MATERIAL SEE NOTES FINISH SEE NOTES TOLERANCES ANG 5 FRACT 1 32 33 DECIMALS 01 XXX 005 REVISION 4 DESCRIPTION SILKSCREEN PCB 1 01616 m 808 D Q2 5 201 4105 A x R B BE x x JEE xj 540 x x 5 x x R49 021 5152 RE m a SFE 291129 js Fz x1 INIFINITY SYSTEMS Sg D AKV x x hx x amp x tix t gt a x 8 x 1 5 80 x 5 R49 x BLA LL x TE X 5 F x LEE 33
20. LEAD WIRES orized by Infinity Systems 10 LONG NOTES 1 SPECIFICATIONS GRAIN ORIENTED SILICON STEEL M4 OR BETTER OUTER DIMENSION 5 25 INNER DIMENSION 2 0 HEIGHT 2 0 WEIGHT 2 25 2 CORE TO BE INSULATED WITH 30 MIL POLYPROPYLENE 3 INSULATION BETWEEN PRIMARY AND SECONDARY TO BE MYLAR 8 10 MIL THICK 4 LABEL TO BE PLACED UNDER FINAL TAPE WRAP SEE DIAGRAM A LABEL TO INCLUDE EITHER DATE CODE OR SERIAL NUMBER VENDOR TO CHOOSE LABEL SIZE 5 THERMAL PROTECTOR MFG PORTAGE ELECTRONIC PRODUCTS INC MODEL G UL FILE 42562 TRANSFORMER MUST BE UL CSA AND SEMKO CERTIFIED TRANSFORMER TO BE HI POT TESTED IN ACCORDANCE WITH CSA PROCEDURES EXCITATION CURRENT lt 15mA 120V 60Hz POWER RATING 170VA MAXIMUM DIMENSIONS OF TRANSFORMER HEIGHT 2 75 DIAMETER 4 13 0 JO Infinity Systems Inc SERVO CNTRL SBWER POWER TRANSFORMER DWG NO 415 5155 01077 560 DRAWN BY K CHRISTIE APPROVED AS R 5 3 7712 61 77 Z DATE 08 13 90 1 OE 4 Integrated Circuit Transistor Diagrams LF353N LF347N OPAMP DUAL OP AMP AUAD BD11 BD12 28D1763A 25B1186A 2 1 3 07 9 10 11 AOUTPUT V OUTPUTA OUTPUTD O A INPUT B OUTPUT W 20 INPUTA INPUT D A INPUT B INPUT AA V B INPUT INPUT NPUT INPUT B ANPUT C OUTPU
21. MP TROUBLESHOOTING the RS SSW IO INFINITESIMAL IV SUBWOOFER Amplifer We are assuming at this point the unit has been tested and there is either distortion no output breathing from woofer it blows fuses instantly etc If the problem is no output whatsoever and the woofer does not react at all upon hearing the relay close disconnect and check the DCR of the woofer with a DMM it should be 1 7 2 2 to rule out a defective woofer Another simple external problem that can be responsible for little or no output is using the high level input terminals and having one polarity reversed on either input cable the right and left signal will effectively cancel at the subwoofer input The relay should close an audible click 2 5 seconds after turning on the unit And obviously if no click is heard the relay has not closed and there will be no output However whether the relay closes or not is of no consequence in the early stages of troubleshooting once the unit has been found defective 99 of the time the relay itself is not defective FOR ALL PROBLEMS EXCEPT BLOWING FUSES SEE SECTION IV After amplifier removal from cabinet pull back plastic cover NOTE plastic amp cover not present on early RS Subwoofer models and examine PC 1 main circuit board It is usually not necessary to completely detach the amp cover from the amp assembly RELAY IS CLOSING NORMALLY Audible click is heard 1 5 seconds after power is turned
22. Qo Infinity Models S9VV 1O subwoofer Infinitesimal IV subwoofer Servo Controlled subwoofer RS Subwoofer SERVICE MANUAL Infinity Systems Incorporated 250 Crossways Park Dr Woodbury New York 11797 Rev0 12 2003 CONTENTS SPECIFICATIONS PRODUCT 1 INSTAEEATION CONTROLS oO HO 2 OPERATION es rra Oc d P al 4 CIRCUIT DESCRIPTION eti a 5 THEORY OF OPERATION 425 eate mc edat nes 11 DETAIEED TRODBEESHOQO T ING s tix ERE ieee DR 18 EXPLODED VIEWS u aa d Rh td atat ated dr ee 24 MECHANICAL ELECTRICAL PARTS 115 65 1 26 xor qu ay aa eon OE Rd ca RR 33 POWER TRANSFORMER 35 SEMICONDUCTOR PINOUTS 36 SCHEMATICS Infinitesimal IV SSW 10 Servo Controlled Subwoofer 37 SCHEMATICS RS Subwoofer sss nene 38 PACKING Infinitesimal IV SSW 10 Servo Controlled Subwoofer 39 SPECIFICATIONS Frequency Response 40 200 Hz Crossover Frequency 40 200 Hz Continuously Variable Output Power 100 Watts RMS into 2 ohms THD 75 W 100 Hz lt 1 Signal to noise ratio gt 80db Input Impedance 25 10 254mm IMG Woofer DCR 1 8 Inputs Line Level and Speaker Level Outputs Infinite
23. S LOOV GIL Ae vaal WEE cow CES a EG me DR UM uw uw HE A O SS ss WIZ deos D 082000 LOOV C33 C34 C35 C36 lt e e e e A O luF 100V INTEGRATED CIRCUITS IC1 QUAD OP AMP LF347 NAT L SEMICONDUCTOR OR EQUIV IC2 DUAL OP AMP LF353 NAT L SEMICONDUCTOR OR EQUIV POTENTIOMETERS VR1 VR2 s i POTENTIOMETER PANEL MOUNT 20K OHM NOBLE P N VB12L 7X5 G3 PH2D N15KC B20KX2 DIODES LED RED e STANLEY BR3932S OR EQUIV INF P N 311 6039 SOCKETS JACKS QTY 1 DUAL PCB MOUNT RCA W RED AND WHITE INSERTS A D ELECTRONICS P N ARL 1416 2 G R OR EQUIV MISCELLANEOUS BOARD MOUNTED COMPONENTS QTY 1 lt e e lt e 5 PIN TEST HEADER MOLEX P N 22 54 1205 OTY L lt ox 5 GG v LAPIN SOCKET FOR 1 1 QTY 1 s e oo o o e o e lt e o gt 8 PIN SOCKET FOR IC2 29 INFINITY SYSTEMS ING PROPRIETARY This document contains confidential FEB 0 9 1993 and proprietary information that is the property of infinity Systems Inc 88W 10 CONT REV D and may not be disclosed to or duplicated for others except as auth orized by Infinity Systems Inc TRANSFORMER TL lt TOROID INF P N 415 5155 BARRIER TERMINAL STRIP QTY 1 4 TERM IN OUT BARRIER STRP MAGNUM A481304 NL INF P N
24. T OUTPUT BCE D1 FEP16 25 1038 Q4 5 6 2 Collector 3 Base 1 Emitter 1 d 4 23 TIP35C TIP36C Q12 15 2SC2389 2SC2061 01 2 3 se 2 Collector Base 1 Emitter 36 REVISIONS REV APPROVED B ECO 788 CHG IEC CONNECTOR P N 01 16 914 BINDS 1 04 R9 G Z1N4148 lt 220K A R7 a 10K a 3 250238 9 n 4 gt 4 a 5 2 2 JO 47 ed Fas 012 GEL E ee ee a ne 220pF i 1 1 Ct cis ud Fi z 047 0047 0047 R30 1 VREA R31 12 8 3 amp EK 1 20KK2 cy 20Kx2 cy 6 8 2555 RIGHT 14 5 LOW FREQUENCY LEVEL d 5 R28 2 520 p 8 45K 5 1K 1 1 1 1 1 1 1 1 1 A 1 oot 04 l 1 ALL R s IN OHMS 1 4 WATT CARBON FILM 5 0 2 ALL CAPS MICROFARADS 1N4148 3 FRONT PANEL CONTROLS Ter x2 Mo EK 0 47 57 Y A gt UNLESS OTHERWISE SPECIFIED 4 Y 017 gt 184148 za czo BR Infinity Systems Inc 51 ars 1347 4 e Pa m l _ SERVO CTRL SBWFR Z ak 38 A L SCHEMATIC AMPLIFIER R51 01 SPEARER alad Sm gas DWG 036 5024 01157 360 w DRAWN BY R RAHL 1 PS 20k DAT
25. ad through the plastic amp cover Re seal if necessary 20 C19 PRINTED CIRCUIT BOARDS RELAY COIL R48 R4 29 9 R53 gt VRS 510 13 R61 x 5 So ROA x rS e 07104 x 6 012 TEST HEADER 2 FILTER BOARD 021 5158 21 POWER SUPPLY FLOW CHART CHECK BAD FUSE CHECK 31V RAILS REPLACE FUSE MISSING CHECK BAD D1 D2 OK CHECK TRANSFORMER OK CHECK SWITCH OK CHECK THERMISTER REPLACE C30 C31 C33 C34 C35 C356 C37 REPLACE D1 D2 REPLACE TRANSFORMER REPLACE SWITCH REPLACE THERMISTER MISSING CHECK 16V RAILS MISSING CHECK C5 C6 C7 REPLACE C5 C6 C7 C8 OK OK FOLLOW 31V STEPS CHECK 31V MISSING CHECK C31 c33 BAD AT RELAY C34 C35 C36 C37 OK CHECK 2 1 2 2 REPLACE RELAY REPLACE 201 202 FOLLOW 16V STEPS 22 SIGNAL FLOW CHART NO OUTPUT FROM WOOFER CHECK SPEAKER OUTPUT WOOFER NO OUTPUT CHECK RELAY BAD REPLACE RLA 1 RELAY OK CHECK SIGNAL MISSING CHECK SIGNAL MISSING CHECK SIGNAL MISSING AT 2 10 42 AT VR 1 OK OK REPLACE REPLACE VR 2 2 REPLACE 5 REPLACE 04 Q5 Q6 CHECK 07 08 09 010
26. ck around the driving amplifier we could flatten out the response to some much lower frequency as shown in Fig 4 In essence that is what the circuitry does The figure shows the effect of the negative feedback on the acoustic response and how the high frequency bandwidth is reduced to the working range of up to about 100 150 Hz by the input crossover filter Refer to fig 5 The power amplifier block has conventional flat voltage gain of about 26 db and provides the power to drive the woofer appropriately The servo amplifier provides the extra open loop gain required for the feedback so that about normal input to output gain from the signal input of the speaker is obtained when the feedback is active Additionally the capacitor Cx rolls off the high frequency response of the open loop gain so the closed loop response will be high frequency stable The velocity bridge amplifier can be seen to amplify and differentiate turn into an acceleration signal the difference signal a b This processed Signal is fed back out of phase into the servo summing junction 11 THEORY OF OPERATION formed by the resistors Rx and Ry resulting in acceleration type motional feedback Resulting acoustic freguency response is flat and overall acoustic freguency response when fed from the front end crossover electronics is determined essentially by those filters Note the labels PCFB and NVFB on the lines leading into the V bridge feedback amplifier These stan
27. d for positive current feedback and negative voltage feedback respectively This is another way to think of how this system works The PCFB reduces the fundamental resonance of the speaker in the box and boosts the acoustic level on either side of the impedance peak Without the stabilizing influence of the NVFB loop the system would of course oscillate By judicious choice of bridge balance and the R s and C s in the V bridge feedback amplifier it is possible to make the unfiltered by the front end before the servo crossover filters acoustic response very flat down to arbitrarily low frequencies or some other shaped response if that were to be desired 12 THEORY OF OPERATION BASIC BRIDGE ACTIVE DUMMY SPEAKER SPEAKER z AMP OUT THEORY OF OPERATION MODIFIED BRIDGE AMP OUT NC 2 RS FIG 2 14 THEORY OF OPERATION ACCELERATION LIKE NEAR FIELD ACOUSTIC PRESSURE VELOCITY AMPLITUDE FREQUENCY Fug 15 THEORY OF OPERATION OLD IN BOX RESONANCE MODIFIED RESPONSE BY Cx FEEDBACK RIPPLES IN RESPONSE DUE TO CONE BREAK UP AMPLITUDE Db RESPONCE WITH FEEDBACK LOW PASS RESPONSE FROM CROSSOVER FILTER Na LOW FREQUENCY ROLL OFF POINT 20 Hz FREQUENCY 100 Hz 1 KHz Fig 4 16 THEORY OF OPERATION 1 E SIGNAL INPUT SERVO AMP x 2 R1 SERVO BRIDGE ArB C D c SERVO BRIDGE FEEDBACK A
28. e are a number of ways to connect your subwoofer Read these next few paragraphs carefully before you decide which method is most suitable for you 1 The subwoofer can be fed directly by a low level signal from your preamplifiers output jacks by using a spare set of output jacks on your preamp if it is so equipped see figure 4a or by using a Y connector if your preamp has only one set of outputs see figure 4b Use standard shielded leads terminated at each end with a male RCA connector Connect one end of each stereo pair of leads to your preamplifier out put left and right and connect the other end to the corre sponding Left and Right Low Level Input jacks 1 on the subwoofer Note When using an all tube preamplifier it is not recom mended to use the low level method of connection if the leads going from the preamp to the subwoofer will be longer than 10 feet 3 meters An all tube preamplifier may not be able to handle the capacitance introduced by leads over 10 feet long Figure 4a OUTPUTS R L LOOR 4 PREAMP W 2 SETS OF OUTPUTS TO SATELLITE SPEAKER AMPLIFIER 7 SERVO SUBWOOFER AMP S D LOW LEVEL S INPUTS Figure 4b OUTPUTS PREAMP W 1 SET OF OUTPUTS Fil TO SATELLITE SPEAKER AMPLIFIER SERVO SUBWOOFER AMP ir RAJ 11 S NI
29. er load should be connected at this time ICI LF347N pin 7 388 mV ICI LF347N pin 1 392 mV Check C16 15uf Capacitor One or both leads must be unsoldered for proper reading Replace if defective IC2 LF353N 7 380 IC3 LF347N pin 14 138 mV R53 See drawing 117mV R48 See drawing 2 7 volts Loss of signal at this point means Relay contacts are defective Replace if necessary Nominal Output at speaker cable 2 7 volts Note When a loss of signal occurs between amplifier stages of different IC s it s easy to be fooled when one amplifier stage is shorted out loading down the previous section of another 1 NOMINAL POT POSITIONS ON MAIN AMP BOARD VR3 Full CW VR4 Half way position Another procedure for confining the problem to one board or the other is as follows 4 Remove both IC s on smaller filter board if they are in sockets if not unsolder 5 conductor ribbon attaching PC 1 to PC 2 Follow TEST CONDITIONS above regarding signal injection except lead should be connected to C19 See drawing for location 3 Turn UUT on Output at speaker cable should be 7 8 VAC If output is normal then problem or loss of signal is on smaller filter board 2 19 TROUBLESHOOTING cont d IV UNIT BLOWS FUSES INSTANTLY Desolder remove power supply wires from PC 1 blue amp black Replace fuse power up unit again Fuse will probably not blow If it does see f 2 1 Proble
30. he relay from closing 18 TROUBLESHOOTING cont d B Ifall voltages are normal Check for 25 to 30 volts across relay terminals See drawing If voltage is present replace relay If little or no voltage is present check for 15 volts on pin of IC3 LF 347N on PC 1 Check for 2 9 to 3 volts on pin 2 Check for 12 7 volts on pin 3 Use main filter caps common point or black power supply wire for ground If any of the above voltages are abnormal Check DC voltage across R4 33KQ See drawing for location Less than 50mV should be present If higher relay will not energize DC is coming through the amplifier section Check and replace semiconductors as necessary If there is negligible voltage across R4 normal condition replace LF 347N IC on PC 1 III RELAY CLOSING NORMALLY BUT NO OUTPUT OR DISTORTION EXISTS A Re read or follow the instructions mentioned on the first page concerning other issues which could result in no output bad woofer or mis wired high level input B If those items check out follow the signal path with schematic and DMM oscilloscope is usually not required checking for these approximate voltages at the points indicated below Use main filter caps common point or black power supply wire for ground TEST CONDITIONS Signal 100 2100 Hz connected to the low level input with a Y cable both right 8 left inputs Both control pots level and frequency Full Clockwise Turn UUT on No speak
31. ints include behind the right channel satellite speaker along the back wall between the satellites along a side wall but not too close to a corner or behind a couch or a chair In general the closer the subwoofer is to walls and cor ners the greater the effect of low frequency enhancement Experiment with the Frequency and Level controls in different locations until you are pleased with the results you obtain from your particular application A WORD OF ADVICE The Low Frequency Rolloff and Level controls may be set anywhere within their rotation However it will be a most unusual circumstance if you have to set the Level control completely clockwise This may Indicate an unbalanced con dition in your system too much bass or an especially large room or room placement may not be correct It would there fore be worthwhile if you tried several other locations before concluding that the Level control must be set at maximum In the event that the subwoofer is located so far from the listening area that its effect is not as prominent as desired you may find that reversing the phase of the high level input wires may help Connect the speaker output terminals to the high level input terminals of the subwoofer on BOTH channels Reversing the phase on only one channel will can cel out the signal to the subwoofer s amplifier resulting in NO output from the subwoofer A WORD ABOUT TONE CONTROLS The tone controls o
32. ker is like the active one except that it s voice coil is frozen If one looks at the difference in the voltage across the sampling resistors a b as a function of frequency in the low frequency range of interest it will be found that the resultant frequency response is proportional to the velocity of the moving cone and is a result of the back emf of the active speaker because it is moving and the dummy speaker is not The resultant voltage difference a b is entirely due to the motion of the active speaker and is thus called motional voltage and can be used for feedback correction of the motion In actual practice one wouldn t use a dummy speaker in the right hand arm of the bridge because it would take up too much power from the driving amplifier In Fig 2 the dummy speaker arm of the bridge is replaced by a higher impedance voltage divider circuit Rl and R2 provide a reduced voltage at point B in respect to ground that is of the same amount as in Fig 1 and the R3 Cl network reduces the voltage at point B in the higher frequencies in an approximation to the way the dummy speakers voice coil inductance does so in Fig 1 Refer to Fig 3 The curve marked velocity is how the frequency response of the difference a b would look If we could modify this curve to the form shown in the curve marked acceleration we would have a measure of how the speaker s acoustic output looks and then with feedback derived from this acceleration Signal applied ba
33. m is usually shorted output transistor or diode semi bridge on PC 1 These consist of TIP 35C 36C TO 218 package BD 911 912 TO 220 package FEN 16 16 TO 220 package Recommended method to power up the unit after an output transistor replacement is with a Variac slowly turning up the input voltage and watching a meter for high AC currents greater than 100 mA Occasionally the output transistors are O K or after a replacement high currents will continue to appear The problem is with one of the biasing transistors Q4 5 6 7 8 or 9 All junctions can be tested in the circuit with a diode check function on a DMM If a short is found however remember some output devices are in parallel and will have to be removed to confirm the short 2 Problem is a shorted toroidal power transformer Replace if defective RECOMMENDED FINAL INSPECTION Check for a burnt or deformed thermistor attached to power cord plug amp switch Replace if defective Make sure the toroidal transformer is tight and will not move easily by hand Make sure the two three on the older RS sub phillips screws holding the PC 1 transistor clamp on the front of the faceplate are tight Loose screws mean poor transistor heatsinking possible premature failure Make sure the correct line fuse is in place 120 volt 3A GMA slo blo only 230 volt 1 5A GMA slo blo only Make sure the red output wires are still maintaining an airtight seal as they thre
34. n your electronic components pre amp receiver etc should be used with the utmost discre tion Excessive boost can create severe power demands on your power amplifier Maximum bass boost can create a demand for literally hundreds of watts in the bass region whereas in the flat position or with the tone controls switched out of the system your average listening level may be impressively and realistically loud at less than 10 watts The remaining power capacity required is on reserve for power peaks on sharp transients and powerful crescendos CARE OF YOUR SUBWOOFER Your Infinity subwoofer cabinet is finished with a heavy duty high quality vinyl which requires very little maintenance Keep the cabinet clean by dusting it occasionally with a damp cloth or use a good quality furniture polish to maintain its original luster When using aerosol products always spray the cloth not the speaker to help prevent any of the product from drifting onto the driver or amplifier FEEDBACK if the bass seems boomy or you notice a rumbling sound when listening to record albums the cause may be acoustic feedback This means that low frequency vibrations from your speakers are reaching the turntable To help isolate the turntable from these vibrations place the turntable on a heavy solid support as far away as possible from the sub woofer If you continue to experience difficulties after experi menting with placement consult your Infinit
35. nput terminal strip 5 Line Cord 6 power switch Turn off your entire audio system prior to connecting your subwoofer Make sure the subwoofer s On Off Switch 6 is in the off position Verify the correct voltage 5 and fuse rating for your A C line current The subwoofer is shipped with the line voltage already set for 120 volts 60 Hz To change to another set ting simply pull the fuse drawer out of its socket and turn it until the proper voltage appears in the window Replace the fuse with the correct fuse size see below Then re insert the fuse drawer into its receptacle Ratings for the line age fuse are as follows VOLTAGE FUSE SIZE U S A 120V 60 Hz 3 Amp slow blow 100V 50 60Hz 3 Amp slow blow 220V 50Hz 1 5 Amp slow blow 240V 50 Hz 1 5 Amp slow blow Connect the subwoofer s A C Line Cord 5 to your preamplifier s or receiver s switched A C convenience outlet If reguired use a heavy duty extension cord to reach the out let If the switched outlet is 2 prong use a floater cheater plug between the subwoofer s power cord and the outlet If using a switched outlet is not feasible plug the sub woofer into any household A C outlet The subwoofer draws very little current when it is not playing so it may be left on without consequence It is advised however to turn the sub woofer s power switch to OFF if the system is not to be used for more than a few days Ther
36. rs when included should aid technicians in part substitution If necessary call the Infinity Parts department at 1 516 496 3400 ext 6553 for assistance 26 INFINITY SYSTEMS ING PROPRIETARY fidential contains con wa at that 15 nfinity Systems Inc pe disclosed to or cept as auth ems 106 and proprietar the property of and may not duplicated for others ex orized by Infinity Syst 1 RESISTORS FEB 09 1993 SERVO SUBWOOFER 10 PCB PARTS LIST 036 5024 P L REVISION D 1151 SCHEMATIC REVISION February 1 1993 SUPERSEDES ALL PREVIOUS PARTS LISTS 021 5152 1 4 WATT TOL 5 CARBON R5 R6 R47 R7 R11 R44 R45 R53 R6 R9 R10 R32 R73 R86 R40 R41 R42 R43 R49 R46 R48 R50 R56 R51 R54 R55 R58 R59 R61 R64 R65 R62 R63 R81 R85 R88 R89 R87 1 2 WATT TOL 5 CARBON R1 R5 1 WATT TOL 5 CARBON FILM R2 R3 R70 WIREWOUND 5 WATT R66 R67 R68 R69 R7 CAPACITORS 0 TOL 10 ELECTROLYTIC 20 TOL 20 DF RADIAL LEAD C5 C6 C7 C8 C9 C10 C C26 11 24 CERAMIC DISK TOL 10 RADIAL LEAD C28 C38 27 33K 2 2K 10K 220K 5 1K 1M 51K 180K 20K 1K 1 8K Q 2 Q 10 A Q Q 2 82 D NO LONGER USE 10000uF 47uF 220uF 100pF 1K 2 75 6K 35V 35V 10V
37. simal IV SSW 10 Servo Controlled Subwoofer Full Range Speaker RS Subwoofer 180 Hz High Pass Filter Dimensions Infinitesimal IV SSW 10 Servo Controlled Subwoofer 13 25 x 13 25 x 13 337 x 337 x 330mm RS Subwoofer 23 25 x 7 25 x 13 25 59x18 5 x 33 5mm Weight Infinitesimal IV SSW 10 Servo Controlled Subwoofer 34 Ibs 15 4kg PRODUCT IDENTIFICATION This service manual covers the following models SSW 10 subwoofer Infinitesimal IV subwoofer Servo Controlled subwoofer RS Subwoofer actually a different product but the amplifier is nearly identical The Infinitesimal subwoofer Infinitesimal IV Subwoofer SSW 10 or Servo Controlled Subwoofer may be identified from the owner s manual outer carton or amplifier plate It is a square black cube and is ported Alternately the RS Subwoofer has a distinct rectangular enclosure The differences in the RS Subwoofer include a non removable power cord two high level input terminals and a passive high pass filter for satellite speakers active when the high level input terminals are utilized There is no port INSTALLATION Refer to figure 3 to identify the controls of the subwoofer s internal amplifier Figure 3 3 Wo Infinity 8 SERVO SUBWOOFER 5 6 1 Low Level Input jacks connect to preamp outputs 2 Freguency controls upper corner roll off point 3 Level controls volume of subwoofer 4 High Level I
38. y dealer CIRCUIT DESCRIPTION THERMAL PROTECTION TH 1 is a temperature sensitive resistor or Thermistor TH 1 and R8 form a variable divider 59 and R10 form a fixed divider IC3A is an comparative IC When TH 1 heats up the resistance of the Variable Divider goes down IC3A senses the drop in the resistance and the difference between the Variable Divider and the Fixed Divider it causes Q3 to go high which causes RAL 1 to open When RAL 1 opens the woofer is taken out of the circuit CIRCUIT DESCRIPTION cont d A C Filtering The A C Filtering is accomplish by the use of C5 and C6 which produces the 31 Volt Rails The 16 Volt rails at C7 and C6 are regulated 201 and 202 in conjunction with 1 and R2 CONNECTOR DS PCB 1 VOLTAGE SELECTOR AND FUSE 1N4004 INFINITY P N 539 5349 L D C PROTECTION 01 and 02 sense the output of the amp for D C If the output of the amp goes DC approximately 2 Volts it will cause the resistance in the Variable divider to go low which will cause 03 to go high which in turn will cause RAL 1 to open This will take the woofer out of the circuit CIRCUIT DESCRIPTION cont d CIRCUIT DESCRIPTION cont d LOW LEVEL INPUT The Right and Left inputs are summed together at pin 6 At this point the signal goes through the high pass filter C13 C14 C15 R26 R27 R28 After which the signal goes through the Low Pass Filter The use of 16 C17 C18
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