Inter-m EQ-2131 User manual

SERVICE
MANUAL
G R A P H I C
EQUALIZER
EQ-2131/2231/2215
www.inter-m.com
MADE IN KOREA
2003.6 9017100400

1
Speci ications 1
Electrical Parts List 2, 3, 4, 5, 6
Top and Bottom View o P.C. Board 7, 8, 9, 10
Wiring Diagram 11, 12, 13
Block Diagram 14, 15, 16
Schematic Diagram 17 ~ 26
Exploded View o Cabinet & Chassis / Mechanical Parts List 27 ~ 32
Ass’y Drawing 33 ~ 38
CONTENTS
SPECIFICATIONS
ELECTRICAL
• Output Level / Impedance ....................................................................................................0dB/600Ω, BAL
• Input Sensitivity / Impedance................................................................................................0dB/600Ω, BAL
• Total Harmonic Distortion ...................................................................................................Less than 0.01%
• Frequency Response....................................................................................................20Hz~20kHz (±1dB)
• Signal to Noise Ratio..........................................................................................................Better than 85dB
• Equalizer Level .....................................................................................................................................+6dB
• Equalizer Frequency
EQ-2131/2231 ...........................................1/3 Octave ISO (International-Standard-Organization) centers
EQ-2215.................................................................................................................2/3 Octave ISO centers
• High Pass Filter...................................................................................................................80Hz (18dB/oct)
• Cut Only Mode..............................................................................................................-12dB or -24dB±3dB
GENERAL
• Power Source..................................................................................... AC 100V/120V/230V/240V, 50/60Hz
• Power Consumption .................................................................................................... EQ-2131/2215: 15W
.............................................................................................................................................. EQ-2231: 20W
• Weight ............................................................................................................. EQ-2131/2215: 4.5kg/10Lbs
..................................................................................................................................... EQ-2231: 5kg/11Lbs
• Dimensions.................................................................. 482mm/19in(W) 88mm/3.5in(H) 280mm/11in(D)
* Due to continuous improvements speci ications and design are subject to change without prior notice.

32
ELECTRICAL PARTS LIST
Ref No. Part No. ValueDescription
MAIN B’D ( 003 80 00)
EQ-2131
Ref No. Part No. ValueDescription
C208-211 3408210261 CAP RSG 1000UF 35V SNAP 16 P 1000/35
C204 3409210071-T CAP AF RSG 10UF 50V 5 P 10/50
C116-117 C125 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C101-102 C105 3409222141-T CAP AF RSG 220UF 25V J 8 P 220/25
C214-215
C109 C140 3409247041-T CAP AF RSG 47UF 25V 5 P 47/25
C205 3409247071-T CAP AF RSG 47UF 50V 6 P 47/50
C110 3509101231-A CAP CE B 100PF 50V K AXIAL 100P
C206 C212-213 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C104 C124 3509121231-A CAP CE B 120PF 50V K AXIAL 120P
C207 3509221930-T CAP CE 220P 50V UJ TYPE 220P
C114 3509271231-A CAP CE B 270PF 50V K AXIAL 270P
C122 C126-127 3529103531-A CAP CE F 10000PF 50V Z 10000P
C130-133
C135-136
C111-113 C118 3529220311-A CAP CE SL 22PF 50V J AXIAL 22P
C139
C115 C119 3529470311-A CAP CE SL 47PF 50V J AXIAL 47P
C120 C141-142 3569104933-A CAP CE MONO 0.1UF 50VZSMA-4000 0.1/50
C138 3609103120-T CAP MA 0.01UF 100V 0.01/100(M)
C106-108 3609683120-T CAP MA 0.068UF 100V J 0.068/100(M)
A2 - C2 4355955320 CON ASS’Y 2P 130MM ASSY 2P
CN5 4428596603 LOCK WAFER LW-1143-03P LW-1143-03P
CN101 CN104 4428598303 CONNECTOR WAFER LW-0640-3P LW-0640-3P
CN102 4428598306 CONNECTOR WAFER LW-0640-6P LW-0640-6P
CN103 4428598307 CONNECTOR WAFER LW-0640-7P LW-0640-7P
SW201-B 4428595002 LW5267/LWB0640/2.5MM-02P LW-5267-2P
D101 D201-202 2058100996 DIODE RECTIFIER LT1N4006(4007) 1N 4006
D205-208
D102-107 2058304100 DIODE IN4148M 1N 4148
D203-204
F201 4458999110 FUSE CLIP 5*20 FUSE CLIP
IC105 2118010332 IC NJM 5532DD JRC 5532DD
IC101-104 2118010432 IC NJM2068DD JRC 2068DD
IC106 2118010590 IC NJM4558D JRC 4558D
IC201 2128611000 IC KA7818 COMMON 7818
IC202 2128611100 IC KA7918 COMMON 7918
HEAT SINK 7505207140 “H/S MA-5/8/33,CA-6215” HEAT SINK
JK103 4408194210 XLR JACK(M) E503A0130N XLR 3P(M)
JK102 JK104 4438097310 JACK PHONE 4P PHONE 4P
JK101 4438193610 XLR JACK(F)3P(E203A0031N) XLR 3P(F)
JUMPER 1508400501 JUMP WIRE(0.5/52M/M) JUMPER
Q201-202 2008606999-T KTC3198-BL-AT KTC 3198BL
Q101-106 2028821134-T FET 2SK372 BL-TYPE 4 2SK 372
R124 R127-128 3002100953 RES CF 10K 1/5W F N 10K 1%
R135-136 R149
R102-105 3002150953 RES CF 15K 1/5W F N 15K 1%
R125 R134 3002200953 RES CF 20K 1/5W F N 20K 1%
R129-130 3002205953 RES CF 20.5K 1/5W FN 20.5K 1%
R126 R133 3004100953 RES CF 100 1/5W FN SMA-4000 100 1%
R108 R110 3009101973 RES CF 100 1/5W J N 100
R113 R121 3009103973 RES CF 10K 1/5W J N 10K
R146-147
R157-159
R109 R111 3009104973 RES CF 100K 1/5W J N 100K
R122-123
R131-132
R161-166 R203
R137 R141 3009105973 RES CF 1M 1/5W J N 1M
R139 3009182973 RES CF 1.8K 1/5W J N 1.8K
R106 3009183973 RES CF 18K 1/5W J N 18K
R144 3009202973 RES CF 2K 1/5W J N 2K
R114-115 3009203973 RES CF 20K 1/5W J N 20K
R156 R160 3009204973 RES CF 200K 1/5W J 200K
R208 3009222973 RES CF 2.2K 1/5W J N 2.2K
R116-117 R120 3009272973 RES CF 2.7K 1/5W J N 2.7K
R152 R154 3009273973 RES CF 27K 1/5W J N 27K
R201 3009472973 RES CF 4.7K 1/5W J N 4.7K
R202 3009561973 RES CF 560 1/5W J N 560
R112 R118-119 3009562973 RES CF 5.6K 1/5W J N 5.6K
R148 R150
R142 3009682973 RES CF 6.8K 1/5W J N 6.8K
R143 3009752973 RES CF 7.5K 1/5W J N 7.5K
R151 R153 3009753973 RES CF 75K 1/5W J N 75K
R107 R145 3009823973 RES CF 82K 1/5W J N 82K
R204-207 3039100575-T RES MO 10 2W JR 10 2W
RY101 5528999700 RELAY 876AN2-2C-S 24VDC 24VDC
TERMINAL 4465998210 TERMINAL(250)PCB TAB 250T
TERMINAL 4235007210 GND TERMINAL (POWER B’D) GND
C208-211 3408210261 CAP RSG 1000UF 35V SNAP 16 P 1000/35
C204 3409210071-T CAP AF RSG 10UF 50V 5 P 10/50
C116-117 C125 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C516-517 C525
C101-102 C105 3409222141-T CAP AF RSG 220UF 25V J 8 P 220/25
C214-215
C501-502 C505
C109 C140 C509 3409247041-T CAP AF RSG 47UF 25V 5 P 47/25
C540
C205 3409247071-T CAP AF RSG 47UF 50V 6 P 47/50
C110 C510 3509101231-A CAP CE B 100PF 50V K AXIAL 100P
C206 C212-213 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C104 C124 C504 3509121231-A CAP CE B 120PF 50V K AXIAL 120P
C524
C207 3509221930-T CAP CE 220P 50V UJ TYPE 220P
C114 C514 3509271231-A CAP CE B 270PF 50V K AXIAL 270P
C122 C126-127 3529103531-A CAP CE F 10000PF 50V Z 10000P
C130-133
C135-136 C522
C526-527
C530-533
C535-536
C111-113 C118 3529220311-A CAP CE SL 22PF 50V J AXIAL 22P
C139 C511-513
C518 C539
C115 C119 C515 3529470311-A CAP CE SL 47PF 50V J AXIAL 47P
C519
C120 C141-142 3569104933-A CAP CE MONO 0.1UF 50VZSMA-4000 0.1/50
C520 C541-542
C138 C538 3609103120-T CAP MA 0.01UF 100V 0.01/100(M)
C106-108 3609683120-T CAP MA 0.068UF 100V J 0.068/100(M)
C506-508
A2 - C2 4355955320 CON ASS’Y 2P 130MM ASSY 2P
CN5 4428596603 LOCK WAFER LW-1143-03P LW-1143-03P
CN101 CN104 4428598303 CONNECTOR WAFER LW-0640-3P LW-0640-3P
CN501 CN504
CN102 CN502 4428598306 CONNECTOR WAFER LW-0640-6P LW-0640-6P
CN103 CN503 4428598307 CONNECTOR WAFER LW-0640-7P LW-0640-7P
SW201-B 4428595002 LW5267/LWB0640/2.5MM-02P LW-5267-2P
D101 D201-202 2058100996 DIODE RECTIFIER LT1N4006(4007) 1N 4006
D205-208 D501
D102-107 2058304100 DIODE IN4148M 1N 4148
D203-204
D502-507
FUSE CLIP 4458999110 FUSE CLIP 5*20 FUSE CLIP
IC105 IC505 2118010332 IC NJM 5532DD JRC 5532DD
IC101-104 2118010432 IC NJM2068DD JRC 2068DD
IC501-504
IC106 IC506 2118010590 IC NJM4558D JRC 4558D
IC201 2128610900 IC KA7815 COMMON 7815
IC202 2128610800 IC MC7915 COMMON 7915
HEAT SINK 7505207140 “H/S MA-5/8/33,CA-6215” HEAT SINK
JK103 JK503 4408194210 XLR JACK(M) E503A0130N XLR 3P(M)
JK102 JK104 4438097310 JACK PHONE 4P
JACK PHONE 4P
JK502 JK504
JK101 JK501 4438193610 XLR JACK(F)3P(E203A0031N) XLR 3P(F)
JUMPER 1508400501 JUMP WIRE(0.5/52M/M) JUMPER
Q201-202 2008606999-T KTC3198-BL-AT KTC 3198BL
Q101-106 2028821134-T FET 2SK372 BL-TYPE 4 2SK 372
Q501-506
R124 R127-128 3002100953 RES CF 10K 1/5W F N 10K 1%
R135-136 R149
R524 R527-528
R535-536 R549
R102-105 3002150953 RES CF 15K 1/5W F N 15K 1%
R502-505
R125 R134 R525 3002200953 RES CF 20K 1/5W F N 20K 1%
R534
R129-130 3002205953 RES CF 20.5K 1/5W FN 20.5K 1%
R529-530
R126 R133 R526 3004100953 RES CF 100 1/5W FN SMA-4000 100 1%
R533
R108 R110 R508 3009101973 RES CF 100 1/5W J N 100
R510
R113 R121 3009103973 RES CF 10K 1/5W J N 10K
Ref No. Part No. ValueDescription
R146-147
R157-159 R513
R521 R546-547
R557-559
R109 R111 3009104973 RES CF 100K 1/5W J N 100K
R122-123
R131-132
R161-166 R203
R509 R511
R522-523
R531-532
R561-566
R137 R141 R537 3009105973 RES CF 1M 1/5W J N 1M
R541
R139 R539 3009182973 RES CF 1.8K 1/5W J N 1.8K
R106 R506 3009183973 RES CF 18K 1/5W J N 18K
R144 R544 3009202973 RES CF 2K 1/5W J N 2K
R114-115 3009203973 RES CF 20K 1/5W J N 20K
R514-515
R156 R160 R556 3009204973 RES CF 200K 1/5W J 200K
R560
R208 3009222973 RES CF 2.2K 1/5W J N 2.2K
R116-117 R120 3009272973 RES CF 2.7K 1/5W J N 2.7K
R516-517 R520
R152 R154 R552 3009273973 RES CF 27K 1/5W J N 27K
R554
R201 3009472973 RES CF 4.7K 1/5W J N 4.7K
R202 3009561973 RES CF 560 1/5W J N 560
R112 R118-119 3009562973 RES CF 5.6K 1/5W J N 5.6K
R148 R150 R512
R518-519 R548
R550
R142 R542 3009682973 RES CF 6.8K 1/5W J N 6.8K
R143 R543 3009752973 RES CF 7.5K 1/5W J N 7.5K
R151 R153 R551 3009753973 RES CF 75K 1/5W J N 75K
R553
R107 R145 R507 3009823973 RES CF 82K 1/5W J N 82K
R545
R204-205 3039479575-T RES MO 4.7 2W J RADIAL 4.7 2W
RY101 RY501 5528999700 RELAY 876AN2-2C-S 24VDC 24VDC
TERMINAL 4465998210 TERMINAL(250)PCB TAB 250T
TERMINAL 4235007210 GND TERMINAL (POWER B’D) GND
AN104 4355885714 CONNECTOR ASS’Y 3P (300MM)
ASS ’ Y 3P 300MM
AN101 4355885721 CONNECTOR ASS’Y 3P (510MM) ASS ’ Y 3P 510MM
AN102 4428594506 WAFER (53014-0610)/2MM/MH51004 53014-0610
AN103 4428594507 WAFER (53014-0710)/2MM/MH51004 53014-0710
C400 3409210072-T CAP AF SE 10UF 50V 6.3X5(2.5MM 10/50
C303 C306 C309 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C312 C315 C318
C321 C324 C327
C330 C333 C336
C339 C342 C345
C348 C351 C354
C357 C360 C363
C366 C369 C372
C375 C378 C381
C384 C387 C390
C393-394 C396
C395 C397-399 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C364-365 3609332120-T CAP MA 0.0033UF 100V 0.0033/100(M)
C367-368
C370-371
C373-374
C376-377
C379-380
C382-383
C385-386
C388-389
C391-392
C334-335 3609333120-T CAP MA 0.033UF 100V J 0.033/100(M)
C337-338
C340-341
C343-344
C346-347
C349-350
C352-353
C355-356
Ref No. Part No. ValueDescription
C358-359
C361-362
C301-302 3639334111-T CAP ECQ-V 1H334JL2 0.33UF 50V 0.33/50
C304-305
C307-308
C310-311
C313-314
C316-317
C319-320
C322-323
C325-326
C328-329
C331-332
D302 2300030000 LED LTL-1CHEE LITEON LED3MM
LIMITER 8545993690 LED LIMITER LED LIMITER
D301 D303-309 2309770100 LED BL-S4548 RED 1.8MM LED1.8MM
LIMITER 8545985510 LED LIMITER(2DOT) LED LIMITER
IC301-316 2168220990 IC NJM 2043LD(NJM) 2043LD
JUMPER 1508400501 JUMP WIRE(0.5/52M/M) JUMPER
R310 R350 R390 3001124953 RES CF 124K 1/5W FN 124K 1%
R306 R346 R386 3001143953 RES CF 143K 1/5W FN 143K 1%
R302 3001178953 RES CF 178K 1/5W FN 178K 1%
R337 R377 R417 3002120953 RES CF 12K 1/5W FN 12K 1%
R333 R373 R413 3002150953 RES CF 15K 1/5W F N 15K 1%
R329 R342 R369 3002200953 RES CF 20K 1/5W F N 20K 1%
R382 R409 R422
R325 R338 R365 3002240953 RES CF 24K 1/5W F N 24K 1%
R378 R405 R418
R321 R334 R361 3002301953 RES CF 30.1K 1/5W F N 30.1K 1%
R374 R401 R414
R317 R330 R357 3002392953 RES CF 39.2K 1/5W F N 39.2K 1%
R370 R397 R410
R313 R326 R353 3002475953 RES CF 47.5K 1/5W F N 47.5K 1%
R366 R393 R406
R309 R322 R349 3002610953 RES CF 61K 1/5W F N 61K 1%
R362 R389 R402
R305 R318 R345 3002787953 RES CF 78.7K 1/5W FN 78.7K 1%
R358 R385 R398
R301 3002820953 RES CF 82K 1/5W FN 82K 1%
R314 R354 R394 3002953953 RES CF 95.3K 1/5W F N 95.3K 1%
R323 R363 R403 3003100953 RES CF 1K 1/5W F N 1K 1%
R319 R359 R399 3003120953 RES CF 1.2K 1/5W FN 1.2K 1%
R315 R355 R395 3003150953 RES CF 1.5K 1/5W F N 1.5K 1%
R311 R351 R391 3003200953 RES CF 2K 1/5W FN SMA-4000 2K 1%
R308 R347 R387 3003274953 RES CF 2.7K 1/5W F N 2.7K 1%
R303 3003300953 RES CF 3K 1/5W FN 3K 1%
R304 R307 R312 3003560953 RES CF 5.6K 1/5W F N 5.6K 1%
R316 R320 R324
R328 R332 R336
R340 R344 R348
R352 R356 R360
R364 R368 R372
R376 R380 R384
R388 R392 R396
R400 R404 R408
R412 R416 R420
R424
R341 R381 R421 3003940953 RES CF 9.4K 1/5W F N 9.4K 1%
R343 R383 R423 3004294953 RES CF 294 1/5W FN 294 1%
R339 R379 R419 3004405953 RES CF 405 1/5W F N 405 1%
R335 R375 R415 3004475953 RES CF 475 1/5W FN SMA-4000 475 1%
R331 R371 R411 3004580953 RES CF 580 1/5W FN 580 1%
R327 R367 R407 3004806953 RES CF 806 1/5W FN 806 1%
R426 R429 3009152973 RES CF 1.5K 1/5W J N 1.5K
R425 3009182973 RES CF 1.8K 1/5W J N 1.8K
R433-434 3009184973 RES CF 180K 1/5W J N 180K
R427 3009681973 RES CF 680 1/5W J N 680
R428 R430-432 3009752973 RES CF 7.5K 1/5W J N 7.5K
R435-436
VR301-332 3238079200 VR SLIDE RS451113D 100KW ALPS 100KW
SW301 SW304 4628980110 SW PUSH JPS2281EAB JEIL JPS2281EAB
SW302-303 4628980120 SW PUSH JPS4281A JEIL JPS4281EA
AN104 AN504 4355885714 CONNECTOR ASS’Y 3P (300MM)
ASS ’ Y 3P 300MM
AN101 AN501 4355885721 CONNECTOR ASS’Y 3P (510MM)
ASS ’ Y 3P 510MM
AN102 AN502 4428594506 WAFER (53014-0610)/2MM/MH51004 53014-0610
AN103 AN503 4428594507 WAFER (53014-0710)/2MM/MH51004 53014-0710
C400 C700 3409210072-T CAP AF SE 10UF 50V 6.3X5(2.5MM 10/50
MAIN B’D ( 003 80 00)
EQ-2231/EQ-2215
VR B’D ( 003 80700)
EQ-2131
VR B’D ( 003 80600)
EQ-2231

54
Ref No. Part No. ValueDescription
C303 C306 C309 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C312 C315 C318
C321 C324 C327
C330 C333 C336
C339 C342 C345
C348 C351 C354
C357 C360 C363
C366 C369 C372
C375 C378 C381
C384 C387 C390
C393-394 C396
C603 C606 C609
C612 C615 C618
C621 C624 C627
C630 C633 C636
C639 C642 C645
C648 C651 C654
C657 C660 C663
C666 C669 C672
C675 C678 C681
C684 C687 C690
C693-694 C696
C395 C397-399 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C695 C697-699
C364-365 3609332120-T CAP MA 0.0033UF 100V 0.0033/100(M)
C367-368
C370-371
C373-374
C376-377
C379-380
C382-383
C385-386
C388-389
C391-392
C664-665
C667-668
C670-671
C673-674
C676-677
C679-680
C682-683
C685-686
C688-689
C691-692
C334-335 3609333120-T CAP MA 0.033UF 100V J 0.033/100(M)
C337-338
C340-341
C343-344
C346-347
C349-350
C352-353
C355-356
C358-359
C361-362
C634-635
C637-638
C640-641
C643-644
C646-647
C649-650
C652-653
C655-656
C658-659
C661-662
C301-302 3639334111-T CAP ECQ-V 1H334JL2 0.33UF 50V 0.33/50
C304-305
C307-308
C310-311
C313-314
C316-317
C319-320
C322-323
C325-326
C328-329
C331-332
C601-602
C604-605
C607-608
C610-611
Ref No. Part No. ValueDescription
C613-614
C616-617
C619-620
C622-623
C625-626
C628-629
C631-632
D302 D602 2300030000 LED LTL-1CHEE LITEON LED3MM
LIMITER 8545993690 LED LIMITER LED LIMITER
D301 D303-309 2309770100 LED BL-S4548 RED 1.8MM LED1.8MM
D601 D603-609
LIMITER 8545985510 LED LIMITER(2DOT) LED LIMITER
IC301-316 2168220990 IC NJM 2043LD(NJM) 2043LD
IC601-616
JUMPER 1508400501 JUMP WIRE(0.5/52M/M) JUMPER
R310 R350 R390 3001124953 RES CF 124K 1/5W FN 124K 1%
R610 R650 R690
R306 R346 R386 3001143953 RES CF 143K 1/5W FN 143K 1%
R606 R646 R686
R302 R602 3001178953 RES CF 178K 1/5W FN 178K 1%
R337 R377 R417 3002120953 RES CF 12K 1/5W FN 12K 1%
R637 R677 R717
R333 R373 R413 3002150953 RES CF 15K 1/5W F N 15K 1%
R633 R673 R713
R329 R342 R369 3002200953 RES CF 20K 1/5W F N 20K 1%
R382 R409 R422
R629 R642 R669
R682 R709 R722
R325 R338 R365 3002240953 RES CF 24K 1/5W F N 24K 1%
R378 R405 R418
R625 R638 R665
R678 R705 R718
R321 R334 R361 3002301953 RES CF 30.1K 1/5W F N 30.1K 1%
R374 R401 R414
R621 R634 R661
R674 R701 R714
R317 R330 R357 3002392953 RES CF 39.2K 1/5W F N 39.2K 1%
R370 R397 R410
R617 R630 R657
R670 R697 R710
R313 R326 R353 3002475953 RES CF 47.5K 1/5W F N 47.5K 1%
R366 R393 R406
R613 R626 R653
R666 R693 R706
R309 R322 R349 3002610953 RES CF 61K 1/5W F N 61K 1%
R362 R389 R402
R609 R622 R649
R662 R689 R702
R305 R318 R345 3002787953 RES CF 78.7K 1/5W FN 78.7K 1%
R358 R385 R398
R605 R618 R645
R658 R685 R698
R301 R601 3002820953 RES CF 82K 1/5W FN 82K 1%
R314 R354 R394 3002953953 RES CF 95.3K 1/5W F N 95.3K 1%
R614 R654 R694
R323 R363 R403 3003100953 RES CF 1K 1/5W F N 1K 1%
R623 R663 R703
R319 R359 R399 3003120953 RES CF 1.2K 1/5W FN 1.2K 1%
R619 R659 R699
R315 R355 R395 3003150953 RES CF 1.5K 1/5W F N 1.5K 1%
R615 R655 R695
R311 R351 R391 3003200953 RES CF 2K 1/5W FN SMA-4000 2K 1%
R611 R651 R691
R308 R347 R387 3003274953 RES CF 2.7K 1/5W F N 2.7K 1%
R608 R647 R687
R303 R603 3003300953 RES CF 3K 1/5W FN 3K 1%
R304 R307 R312 3003560953 RES CF 5.6K 1/5W F N 5.6K 1%
R316 R320 R324
R328 R332 R336
R340 R344 R348
R352 R356 R360
R364 R368 R372
R376 R380 R384
R388 R392 R396
R400 R404 R408
R412 R416 R420
R424 R604 R607
R612 R616 R620
R624 R628 R632
Ref No. Part No. ValueDescription
R636 R640 R644
R648 R652 R656
R660 R664 R668
R672 R676 R680
R684 R688 R692
R696 R700 R704
R708 R712 R716
R720 R724
R341 R381 R421 3003940953 RES CF 9.4K 1/5W F N 9.4K 1%
R641 R681 R721
R343 R383 R423 3004294953 RES CF 294 1/5W FN 294 1%
R643 R683 R723
R339 R379 R419 3004405953 RES CF 405 1/5W F N 405 1%
R639 R679 R719
R335 R375 R415 3004475953 RES CF 475 1/5W FN SMA-4000 475 1%
R635 R675 R715
R331 R371 R411 3004580953 RES CF 580 1/5W FN 580 1%
R631 R671 R711
R327 R367 R407 3004806953 RES CF 806 1/5W FN 806 1%
R627 R667 R707
R426 R429 R726 3009152973 RES CF 1.5K 1/5W J N 1.5K
R730
R425 R725 3009182973 RES CF 1.8K 1/5W J N 1.8K
R433-434 3009184973 RES CF 180K 1/5W J N 180K
R733-734
R427 R727 3009681973 RES CF 680 1/5W J N 680
R428 R430-432 3009752973 RES CF 7.5K 1/5W J N 7.5K
R435-436
R728-729
R731-732
R735-736
VR301-332 3238079200 VR SLIDE RS451113D 100KW ALPS 100KW
VR601-632
SW301 SW304 4628980110 SW PUSH JPS2281EAB JEIL JPS2281EAB
SW601 SW604
SW302-303 4628980120 SW PUSH JPS4281A JEIL JPS4281EA
SW602-603
AN104 4355885705 CONNECTOR ASS Y 3P (120MM) ASS Y 3P 120MM
AN101 AN504 4355885714 CONNECTOR ASS Y 3P (300MM) ASS Y 3P 300MM
AN501 4355885721 CONNECTOR ASS Y 3P (510MM) ASS Y 3P 510MM
AN102 AN502 4428594506 WAFER (53014-0610)/2MM/MH51004 53014-0610
AN103 AN503 4428594507 WAFER (53014-0710)/2MM/MH51004 53014-0710
C400 C700 3409210072-T CAP AF SE 10UF 50V 6.3X5(2.5MM 10/50
C303 C306 C309 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C312 C315 C318
C321 C324 C327
C330 C333 C336
C339 C342
C345-346 C348
C603 C606 C609
C612 C615 C618
C621 C624 C627
C630 C633 C636
C639 C642
C645-646 C648
C347 C349 C647 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C649
C331-332 3609332120-T CAP MA 0.0033UF 100V 0.0033(M)
C334-335
C337-338
C340-341
C343-344
C631-632
C634-635
C637-638
C640-641
C643-644
C316-317 3609333120-T CAP MA 0.033UF 100V J 0.033(M)
C319-320
C322-323
C325-326
C328-329
C616-617
C619-620
C622-623
C625-626
C628-629
Ref No. Part No. ValueDescription
C301-302 3639334111-T CAP ECQ-V 1H334JL2 0.33UF 50V 0.33/50
C304-305
C307-308
C310-311
C313-314
C601-602
C604-605
C607-608
C610-611
C613-614
D302 D602 2300030000 LED LTL-1CHEE LITEON LED3MM
LIMITER 8545993690 LED LIMITER LED LIMITER
D301 D303-309 2309770100 LED BL-S4548 RED 1.8MM LED1.8MM
D601 D603-609
LIMITER 8545985510 LED LIMITER(2DOT) LED LIMITER
IC301-308 2168220990 IC NJM 2043LD(NJM) 2043LD
IC601-608
JUMPER 1508400501 JUMP WIRE(0.5/52M/M) JUMPER
R302 R322 R342 3001143953 RES CF 143K 1/5W FN 143K 1%
R602 R622 R642
R317 R337 R357 3002120953 RES CF 12K 1/5W FN 12K 1%
R617 R637 R657
R313 R333 R353 3002200953 RES CF 20K 1/5W F N 20K 1%
R613 R633 R653
R318 R338 R358 3002240953 RES CF 24K 1/5W F N 24K 1%
R618 R638 R658
R309 R329 R349 3002301953 RES CF 30.1K 1/5W F N 30.1K 1%
R609 R629 R649
R314 R334 R354 3002392953 RES CF 39.2K 1/5W F N 39.2K 1%
R614 R634 R654
R305 R325 R345 3002475953 RES CF 47.5K 1/5W F N 47.5K 1%
R605 R625 R645
R310 R330 R350 3002610953 RES CF 61K 1/5W F N 61K 1%
R610 R630 R650
R301 R321 R341 3002787953 RES CF 78.7K 1/5W FN 78.7K 1%
R601 R621 R641
R306 R326 R346 3002953953 RES CF 95.3K 1/5W F N 95.3K 1%
R606 R626 R646
R311 R331 R351 3003100953 RES CF 1K 1/5W F N 1K 1%
R611 R631 R651
R308 R327 R347 3003150953 RES CF 1.5K 1/5W F N 1.5K 1%
R608 R627 R647
R303 R323 R343 3003274953 RES CF 2.7K 1/5W F N 2.7K 1%
R603 R623 R643
R304 R307 R312 3003560953 RES CF 5.6K 1/5W F N 5.6K 1%
R316 R320 R324
R328 R332 R336
R340 R344 R348
R352 R356 R360
R604 R607 R612
R616 R620 R624
R628 R632 R636
R640 R644 R648
R652 R656 R660
R319 R339 R359 3004405953 RES CF 405 1/5W F N 405 1%
R619 R639 R659
R315 R335 R355 3004649953 RES CF 649 1/5W FN SMA-4000 649 1%
R615 R635 R655
R364 R367 R664 3009152973 RES CF 1.5K 1/5W J N 1.5K
R667
R363 R663 3009182973 RES CF 1.8K 1/5W J N 1.8K
R433-434 3009184973 RES CF 180K 1/5W J N 180K
R733-734
R362 R662 3009681973 RES CF 680 1/5W J N 680
R361 R365 3009752973 RES CF 7.5K 1/5W J N 7.5K
R431-432
R435-436 R661
R665 R731-732
R735-736
VR301-315 3238079200 VR SLIDE RS451113D 100KW ALPS 100KW
VR332
VR601-615
VR632
SW301 SW304 4628980110 SW PUSH JPS2281EAB JEIL JPS2281EAB
SW601 SW604
SW302-303 4628980120 SW PUSH JPS4281A JEIL JPS4281EA
SW602-603
VR B’D ( 003 80500)
EQ-2215

7
TOP AND BOTTOM VIEW OF P.C BOARD
6
Ref No. Part No. ValueDescription
EQ-2131/2231/2215 4448997310 AC INLET PA-9200RC AC INLET
4648097210 JW-S11RKKR ROCKERS RED POWER SW
4355891914 CON ASS’Y 2P MX-200 ASS’Y 2P
4355470614 CON ASS’Y 2P(300MM) ASS’Y 2P
4355917701 SOCKET TERMINAL (YEL-GRE/80MM) GND
4355864109 SOCKET TERMINAL(190M/M.BK) INLET-250T
4355864209 SOCKET TERMINAL(190M/M.WH) INLET-250T
4308993510 AC CORD KKP-210/KKS-16T (JIS) 100V (J)
4308999310 AC CORD UL 3 (INLET) 120V (E)
4308997310 AC CORD DOME 3-CORES 220V (DOM)
4308999410 AC CORD V+VII6A-250VHOVV-F3G 230V (R)
4308991010 AC POWER CORD 10A/250V UK 230V~240V (C)
4308998000 AC CORD POWER FOR SAA 240V (D)
EQ-2131 4355773021 CON ASS’Y 6P (510MM) ASS’Y 6P
4355885510 CON ASS’Y 7P(RED/450MM) ASS’Y 7P
2828063410 POWER TRANS 100V E-30IJ/31IJ 100V
2828063400 POWER TRANS 115/230V E-30/31I 120V ~ 240V
5508411134 FUSE 218T 20MM 200MA/250V UCSK 100V ~ 120V
5508410734 FUSE 50T 20MM 100MA/250V S/V 220V ~ 240V
EQ-2231 4355773014 CON ASS’Y 6P (300MM) ASS’Y 6P
4355773019 CON ASS’Y 6P (450MM) ASS’Y 6P
4355876610 CON ASS’Y 7P(BLACK/360MM) ASS’Y 7P
4355885510 CON ASS’Y 7P(RED/450MM) ASS’Y 7P
2828083620 TRANS POWER E62 100V ~ 240V
5508411934 FUSE 218T 20MM 630MA/250V UCSK 100V ~ 120V
5508411434 FUSE TS 20MM 315MA/250V U/C/S 220V ~ 240V
EQ-2215 4355773014 CON ASS’Y 6P (300MM) ASS’Y 6P
4355773019 CON ASS’Y 6P (450MM) ASS’Y 6P
4355885510 CON ASS’Y 7P(RED/450MM) ASS’Y 7P
4355876610 CON ASS’Y 7P(BLACK/360MM) ASS’Y 7P
2828063400 POWER TRANS 115/230V E-30/31I 100V ~ 240V
5508411134 FUSE 218T 20MM 200MA/250V UCSK 100V ~ 120V
5508410734 FUSE 50T 20MM 100MA/250V S/V 220V ~ 240V
ASS’Y
EQ-2131/EQ-2231/EQ-2215

98

11
WIRING DIAGRAM
10
– EQ-2131

1312
– EQ-2231 – EQ-2215

1514
BLOCK DIAGRAM
– EQ-2131 – EQ-2231

16
– EQ-2215

SCHEMATIC DIAGRAM
1817
– EQ-2131

2019
– EQ-2231

2221
– EQ-2231

2423
– EQ-2215

2625
– EQ-2215

2827
EXPLODED VIEW OF CABINET & CHASSIS / MECHANICAL PARTS LIST
S10
S4
25
S4
27
21
S5 S5
S6
14
S4
3
26
S4
S7
18
S8
22
17
8
23
S5
19
24
15 S1
S2
12
10
11
S3
S9
2
20
5
NO PARTS NAME
BOTTON SUPPORT
HOLDER BRACKET
LED LIMITER (2DOT)
PHONE JACK
TOP COVER
LED LIMITER
XLR JACK (M)
KNOB PUSH
CHASSIS FRONT
PANEL FRONT
CHASSIS MAIN
6
5
4
2
1
3
8
7
9
11
10
PARTS NUMBER Q'TY
650595 3310
653899 9908
854398 2210
612167 3820
612228 8510
860296 2510
440819 4210
443809 7310
612369 4820
854599 3690
854598 5510
3
2
8
1
1
1
2
2
8
1
AC CORD DOME3-CORES
ASS'Y SCREW PM 4X8N
BOTTON SUPPORT
AC INLET
SHT PCB
POWER PCB
FRONT PCB
POWER SWITCH
POWER TRANS
XLR JACK (F)
JACK BKT
SLIDE V/R
17
16
14
15
13
12
22
20
18
19
21
SCREW SUPPORT
FOOT
SW PUSH
AC INPUT PCB
SCREW FM3x8B
SCREW FM2x8B
SHEET INSULATION
INOUT PCB
26
27
24
25
23
S2
NO
S1
28
PART NAME
SCREW 3BTC4X6B
SCREW PM2x6Y
SCREW BM3x6NI
SCREW PM2x3Y
SCREW #3BTC3x6B
SCREW #2BTC 3X8B
SCREW BM 3X20BS8
S6
S5
S7
S3
S4
S9
S10
444899 7310
440819 3610
653899 7610
650595 9710
464809 7810
282806 3400
400348 2500
430899 7310
400348 2600
400348 2700
1
32
4
1
2
1
1
1
1
11
802913 0083
802912 0083
653899 5510
056335999520
670599 3110
400348 2610
400348 2620
462898 0110
PART NUMBER
2
4
1
1
1
2
Q'TY
4
8
810923 0083
809599 4710
810933 0063
800913 0203
800913 0063
801912 0031
810934 0063
801912 0061 2
14
12
1
46
14
4
2
16
6
1
1
13
1
323807 9200
49
28
7
– EQ-2131

3029
S4
25
14
27 S4
26
S10
3
S4
22
S5
S5
21
18
23
S8
17
19
S5
11 10
12
S4
S6
8
24
15 S1
S2
S7
S9
2
NO
6
3
1
2
4
5
10
11
9
7
8
612228 8610
860296 2710
612167 3810
854598 5510
854599 3690
612369 4820
443809 7310
440819 4210
854398 2210
653899 9908
650595 3310
PARTS NUMBERPARTS NAME
HOLDER BRACKET
CHASSIS MAIN
PANEL FRONT
CHASSIS FRONT
KNOB PUSH
BOTTON SUPPORT
XLR JACK (M)
LED LIMITER
TOP COVER
PHONE JACK
LED LIMITER (2DOT)
Q'TY
3
1
1
1
8
4
2
1
8
2
17
12
13
15
14
16
21
19
18
20
22
23
25
24
27
26
28
S1
NO
S2
S8
S4
S3
S7
S5
S6
S10
S9
PART NUMBER
462898 0110
400348 2620
400348 2610
670599 3110
056335999520
653899 5510
802912 0083
802913 0083
400348 2700
400348 2600
430899 7310
400348 2500
282808 3620
464809 7810
650595 9710
653899 7610
440819 3610
323807 9300
444899 7310
AC CORD DOME3-CORES
AC INLET
SLIDE V/R
JACK BKT
XLR JACK (F)
POWER SWITCH
BOTTON SUPPORT
POWER TRANS
FRONT PCB
POWER PCB
SHT PCB
INOUT PCB
SHEET INSULATION
AC INPUT PCB
SCREW SUPPORT
FOOT
PART NAME
SCREW FM2x8B
SCREW FM3x8B
SW PUSH
1
2
1
4
64
11
1
1
1
1
1
1
1
4
4
8
4
Q'TY
2
801912 0061
810934 0063
801912 0031
800913 0063
810934 0083
810933 0063
809599 4710
810923 0083SCREW #2BTC 3X8B
ASS'Y SCREW PM 4X8N
SCREW 3BTC 4X8B
SCREW #3BTC3x6B
SCREW PM2x3Y
SCREW BM3x6NI
SCREW PM2x6Y
SCREW 3BTC4X6B
4
14
46
1
12
14
2
4
1
S3
13
16
20
5
7
6
28
9
4
2
2
– EQ-2231

3231
PARTS NAME
CHASSIS MAIN
PANEL FRONT
CHASSIS FRONT
KNOB PUSH
S10
NO
3
1
2
4854398 2210
612167 3830
PARTS NUMBER
860296 2610
612228 8410 1
1
1
Q'TY
8
11
S4
S4
25 10
14
12
S4
PART NAME
SCREW BM 3X20B
INOUT PCB
SHEET INSULATION
ASS'Y SCREW PM 4X8N
SCREW #2BTC 3X8B
SCREW #3BTC3x6B
SCREW PM2x3Y
SCREW FM2x8B
SCREW FM3x8B
SCREW BM3x6NI
SCREW PM2x6Y
SCREW 3BTC4X6B
SLIDE V/R
JACK BKT
XLR JACK (F)
POWER TRANS
XLR JACK (M)
BOTTON SUPPORT
LED LIMITER
TOP COVER
PHONE JACK
LED LIMITER (2DOT)
HOLDER BRACKET
AC CORD DOME3-CORES
POWER SWITCH
BOTTON SUPPORT
FRONT PCB
POWER PCB
AC INPUT PCB
27 3
S4
26
S7
S5
21
22
S5
S6
23
S8
18
23
12
10
11
13
5
9
7
6
8
21
15
14
19
16
18
17
20
22 SHT PCB
AC INLET
17
19
S5
8
25
24
28
27
26
S1
NO
SW PUSH
FOOT
S8
S4
S2
S3
S7
S5
S6
S10
S9
1400348 2620
400348 2700
400348 2600
464809 7810
323807 9200
650595 9710
440819 3610
282806 3400
444899 7310
653899 7610
430899 7310
440819 4210
653899 9908
854598 5510
854599 3690
650595 3310
612369 4820
443809 7310
400348 2500
2
4
1
2
2
8
2
3
4
32
11
1
1
1
1
1
4
1
801912 0061
800913 0203
810934 0063
810933 0063
802912 0083
801912 0031
802913 0083
PART NUMBER
809599 4710
810923 0083
800913 0063
400348 2610
462898 0110
670599 3110
056335999520 1
1
8
4
4
Q'TY
14
46
2
1
12
14
2
2
4
24
15 S1
S2
1
2
S9
S3
5
4
28
6
9
716
20
SCREW SUPPORT 653899 5510 2
13
– EQ-2215

3433
ASS’Y DRAWING
88 280
7 8
3
2
5
MAIN CHASSIS
046121673821
046121673822
046121673823
046121673824
1
1
2
4
3
6
8
VR SLIDE 32
3238079200
AC INLET 4448997310
1
9
71
4438097310
JACK PHONE
POWER SWITCH 4648097810 1
FRONT PANEL 048602962511 1
DOM
C/R
E
D
1
1
Remark
No. Description Part No Q'ty
LED LIMITER 8545993690 1
PUSH KNOB 8543982210 4
TOP COVER 046123694823 1
6 9
5
421
ASSEMBLED IN CHINA
~AC INPUT
230V, 50Hz
10W
OUTPUTS
www.inter-m.com SN
MODEL NO. EQ-2131
SINGLE 31-BAND
GRAPHIC EQUALIZER
CONSTANT Q
OC03
INPUTS
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
NO USER SERVICEABLE PARTS INSIDE.
RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
CAUTION;
AVIS;
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER. BALANCED
10KΩ, 4dBu
UNITY GAIN
BALANCED
10KΩ, 4dBu
BALANCED 75Ω
4dBu UNITY GAIN
BALANCED 75Ω
4dBu UNITY GAIN
– EQ-2131

3635
88 280
7 8
2
3
6 9
5
4 1
MAIN CHASSIS
046121673811
046121673812
046121673813
046121673814
1
1
2
4
6
8
VR SLIDE 64
3238079300
1
9
1
AC INLET 4448997310
74
4438097310
JACK PHONE
POWER SWITCH 4648097810 1
5FRONT PANEL 048602962711 1
DOM
C/R
E
D
1
1
Remark
No. Description Part No Q'ty
3LED LIMITER 8545993690 2
PUSH KNOB 8543982210 8
TOP COVER 046123694823 1
OUTPUTS
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
NO USER SERVICEABLE PARTS INSIDE.
RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR.
CAUTION;
AVIS;
TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
www.inter-m.com
SN
OC03
BALANCED 75Ω
4dBu UNITY GAIN
BALANCED 75Ω
4dBu UNITY GAIN
BALANCED 75Ω
4dBu UNITY GAIN
BALANCED 75Ω
4dBu UNITY GAIN
INPUTS
BALANCED
10KΩ, 4dBu
UNITY GAIN
BALANCED
10KΩ, 4dBu
BALANCED
10KΩ, 4dBu
UNITY GAIN
BALANCED
10KΩ, 4dBu
CHANNEL ACHANNEL BCHANNEL ACHANNEL B
~AC INPUT
230V, 50Hz
10W
ASSEMBLED IN CHINA
MODEL NO. EQ-2231
DUAL 31-BAND
GRAPHIC EQUALIZER
CONSTANT Q
– EQ-2231