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SERVICE MANUAL
P O W E R

AMPLIFIER
M-1500/2000
http://www.inter-m.com
MADE IN KOREA
NO: 9007979000

ELECTRICAL ADJUSTMENT PROCEDURE
IDLE CURRENT
A. Setting Set the master volume minimum. B. Connection

TP1 R162 VR101 AMP B'D R145

TP2

VOLT METER

C. Adjustment ­ Adjust VR101 so that the current through the R162, R145 become 10 milliampere. ­ When that voltage across the "TP1" to "TP2" becomes 30 millivolt, the current becomes 10 milliampere.

CONTENTS
Electrical Adjustment Procedure Specifications Electrical Parts List Top and Bottom View of P.C. Board Wiring Diagram Block Diagram Schematic Diagram Exploded View of Cabinet & Chassis / Mechanical Parts List Ass'y Drawing 1 2 3, 4 5, 6 7 8 9, 10, 11, 12 13, 14 15, 16

1

SPECIFICATIONS
M-1500
Power Output Level f=1kHz, THD+N0.05% (Typical) STEREO RL=8 RL=4 BRIDGED RL=8 One Channel Driven f=1kHz THD+N0.05% RL=8 Frequency Response RL=8, P.=1W Power Bandwidth Half Power, THD+N0.1% STEREO RL=8 Total Harmonic Distortion (THD+N) f=20Hz~20kHz, Half Power STEREO RL=8 RL=4 BRIDGED RL=8 Channel Separation Half Power RL=8, f=1kHz, ATT. max. Input 600 shunt Residual Noise (DIN Audio Filter) Signal-to-Noise Ratio DIN Audio, Input 600 Shunt Damping Factor RL=8, f=1kHz Slew Rate 8 Full Swing STEREO BRIDGED Sensitivity (ATT max.) Rated Power into 4 1kHz Voltage Gain (ATT max.) 4 1kHz Input Impedance (ATT max.) Indicators 500W+500W 750W+750W 1500W

ELECTRICAL PARTS LIST
M-2000
670W+670W 1000W+1000W 2600W
Ref No. Part No. Description Value Ref No.
C309 C310 C320, C370 C360 COIL 1-4 IC301-303 JK301, JK303 JK302, JK304 R301, R351 R302, R352 R303-306, R353-356 R307, R357, R370 R308, R358 R309, R359 R312, R362 R316-317 R318 R366-367 R368-369 SW301

Part No.
3409247071-T 3529330311-A 3529103531-A 3529470311-A 3908609980 2168220989 4438090310 4408194310 3009823973 3009105973 3002150953 3009101973 3009103973 3003300953 3003656953 3009563973 3009104973 3009303973 3009153973 4618999910

Description
CAP AF RSG 47UF 50V 6P CAP CE SL 33PF 50V J AXIAL CAP CE F 10000PF 25V Z CAP CE SL 47PF 50V J AXIAL EMI FILTER 2200PF IC NJM 2068L JRC JACK COMBINATION CXLF-06L XLR JACK (M) E503A0150N RES CF 82K 1/5W J N RES CF 1M 1/5W J N RES CF 15K 1/5W F N RES CF 100 1/5W J N RES CF 10K 1/5W J N RES CF 3K 1/5W FN RES CF 6.56K 1/5W FN RES CF 56K 1/5W J N RES CF 100K 1/5W J N RES CF 30K 1/5W J N RES CF 15K 1/5W J N SW SS65010-0203-9H-FN

Value
47/50 33P 0.01/25 47P EMI FILTER 2200P 2068DD COMBI XLR 82K 1M 15K 1% 100 10K 3K 1% 6.56K 1% 56K 100K 30K 15K SLIDE/2POLE

POWER B'D (4005185600)
AN102 AN202 AN403 AN501-502 BD100 BD501-502 C124 C501-504 C501-504 C505-506 C510-513, C520-523 C514 C515, C528-529 C516, C531 C524-525 C526-527 C532 CN501, CN502 CN503 CN506-511 D501-504, D506-507 D505 FAN 1-2 F101 F101 F101 F101 F102 F501-503 IC501 IC502 INLET1 P51-53 P501 P502-503 P504 PO501-502 PT1 PT1 PT1 PT1 PT1 PT1 PT1 PT1 Q501 Q502 Q503 R501 R502 R503 RY503 SW101 4355824510 4355824515 4355767415 4355789603 2058100998 2058100987 3549472407 3409268205 3409268209 3619474153 3509472530-T 3408210261 3409210071-T 3409210141-T 3409222171-T 3408247169 3408210191 4428594903 4428595009 4465998210 2058100996 2058502240 7308999010 5568224933 5568224833 5568225033 5568224433 5568224933 5508412234 2128610900 2128610800 4448997410 4465998210 4355789207 4355789306 4355789403 2438200515 2828063800 2828063810 2828063820 2828063840 2828063700 2828063710 2828063720 2828063730 2008606108-T 2028407990 2028406113 3009122973 3009822973 3009102973 5528009993 4625996611 CON ASS'Y 5P CON ASS'Y 5P CON ASS'Y 3P (4P) CON ASS'Y 2P FAN DIODE KBPC3504 DIODE BRIDGE (KPBP) 152 CAP SPARK KILLER 0.0047UF 400V CAP HC 6800UF 125V M-1500 CAP HC 6800UF 160V M-2000 CAP POLY TM 0.47UF 250V CAP CE F 0.0047UF 50V Z CAP RSG 1000UF 35V SNAP 16P CAP AF RSG 10UF 50V 5P CAP AF RSG 100UF 25V 6P CAP AF RSG 220UF 50V SG 10P CAP AF SG 470UF 35V CAP RSA 100UF 100V SNAP 13P LA5268/LAB0640/2.5MM-03P LW5267/LWB0640/2.5MM-09P TERMINAL (250) PCB TAB DIODE RECTIFIER LT1N4006 (4007) ASS'Y 5P ASS'Y 5P ASS'Y 3P ASS'Y 3P KBPC 3504 KPBP 152 0.0047/400 6800/125 6800/160 0.47/250 0.0047/50 1000/35 10/50 100/25 220/50 470/35 100/100 CN 3P CN 3P 250T 1N 4006

500W 670W 0dB+0.5, ­1.5dB: f=DC~55kHz 10Hz~40kHz

0.05% 0.07% 0.07% 80dB ­70dB: ATT min. 100dB 150 ±40V/µ 0dBm 37dB 38.2dB 20k (Balance/Unbalance) Power (Red) Protection (Mute) x 2 (Red) Clip x 2 (Orange) Signal x 4 (Green) Power SW ON/OFF muting Heatsink Temp 100°C (212°F) RL < 2 ­50°C (122°F)­60°C (140°F)­ Low-Speed ­ Variable ­ Hi-Speed (Front) Power SW: Push up On/Push down Off Attenuator: 21-position dB calibrated (Rear) Mode SW: Bridge=BTL/STEREO/PARALLEL AC 110V­240V, 50/60Hz 1030W (1200VA) 1450W (1680VA) 950W 1300W 20kg 23kg 482(W) 132(H) 369(D) mm Input XLR-3-31 type + 1/4" Phone (balanced), XLR Output 5-Way binding posts 2, Speakon Terminal 2

VR B'D (4005185620)
AN103, AN203 C401-402, C451-452 C403, C405, C453, C455 C404, C454 CN401-402 CN403-405 D401-402, D451-452 D403, D453 IC401 LD401 R401, R404, R409, R410, R451, R454, R459-460 R402, R407, R455, R457 R403, R406, R453, R456 R405, R452 R408, R458 R421-422 Q401-404, Q451-454 VR401-402 4355801006 3409247971-T 3409210071-T 3609104120-T 4428595005 4428595003 2058304100 2058502150 2118010332 2308252222 3009102973 CON ASS'Y 6P FLAT CAP AF RSG 4.7UF 50V 5P CAP AF RSG 10UF 50V 5P CAP MA 0.1UF 100V J LW5267/LWB0640/2.5MM-05P LW5267/LWB0640/2.5MM-03P DIODE IN4148 DIODE ZENER UZ-15BM (11.6, 12.4) IC NJM 5532DD JRC LED REF SLR-54UR R5 RED ROHM RES CF 1K 1/5W J N ASS'Y 6P 4.7/50 10/50 0.1/100 (M) WAFMW5P2.54 WAFMW3P2.54 1N 4148 UZ 15BM NJM 5532DD R5R 1K

Protection PC Limiter Fan Circuit Controls

DIODE ZENER UZ-24BM (23.1, 25.5) UZ 24BM FAN F8025*24B MA-430/830 FAN1 CIRCUIT BREAKER 25A (UL/CSA) M-1500 25A (UL/CSA) CIRCUIT BREAKER 15A (DOM, EUROPE) M-1500 15A (DOM, EUROPE) CIRCUIT BREAKER 35A (UL/CSA) M-2000 35A (UL/CSA) CIRCUIT BREAKER 20A (DOM, EUROPE) M-2000 20A (DOM, EUROPE) CIRCUIT BREAKER (W58-XC4C12A-25) 25A FUSE TS 20MM 1A/250V U/C/S T1AL IC KA7815 COMMON 7815 IC MC7915 COMMON 7915 AC INLET 6100.4315 250T SCURTE AC INPUT TERMINAL (250) PCB TAB 250T CON ASS'Y RED ASS'Y CON ASS'Y 1P ORG ASS'Y CON ASS'Y 1P BLK ASS'Y THERMISTOR POWER NTC 5D-15 TH1D-22 TRANS POWER 120Version M-1500 (UL/CSA) P.T (120 Version) TRANS POWER 220Version M-1500 (DOM) P.T (220 Version) TRANS POWER 230Version M-1500 (EUROPE) P.T (230 Version) TRANS POWER 240Version M-1500 (EUROPE) P.T (240 Version) TRANS POWER 120Version M-2000 (UL/CSA) P.T (120 Version) TRANS POWER 220Version M-2000 (DOM) P.T (220 Version) TRANS POWER 230Version M-2000 (EUROPE) P.T (230 Version) TRANS POWER 240Version M-2000 (EUROPE) P.T (240 Version) TR NPN KTC2240BL (KTC 3200BL) KTC 2240BL TR NPN 2SC 3298A(Y), KTC4370A(Y) KTC 4370 TR NPN KTD 2058Y (D880Y) D2058 RES CF 1.2K 1/5W J N 1.2K RES CF 8.2K 1/5W J N 8.2K RES CF 1K 1/5W J N 1K RELAY VH-24H O.E.G/TAKAMISAWA T9A S1D 22-24 SW POWER (IC1350AT) ARCOLECTRIC POWER SWITCH

3009104973 3009222973 3009331973 3009273973 3009472973 2008606104-T 3227075410

RES CF 100K 1/5W J N RES CF 2.2K 1/5W J N RES CF 330 1/5W J N RES CF 27K 1/5W J N RES CF 4.7K 1/5W J N TR NPN KTC 3198Y VR RK 16311605A213A (RMG58)

100K 2.2K 330 27K 4.7K KTC 3198 10KB

OUTPUT B'D (4005185630)
C801-804 C805-806 CN514-517 R801-804 SP1-2 SP3-4 3609104120-T 3509103530-T 4465998210 3039100572-F 4438091710 4438090210 CAP MA 0.1UF 100V J CAP CE F 0.01UF 50V Z TERMINAL (250) PCB TAB RES MO 10 2W J N JACK SPEAKON (PCB INSERT TYPE) TERMINAL BINDING POST 2P 0.1/100 (M) 0.01/50 250T 10 2W SPEAKON SP-TER2P

Power Source Power Consumption Weight Dimensions Connectors

INPUT B'D (4005185610)
AN101, AN104, AN201 AN404-405 C301-302, C306, C311, C351-352, C356 C303, C353 C304-305, C308, C354-355, C358, C359 C307, C357 4428599002 WAFER YW025-02 YW025-02P

120V 230V­240V

LED 1/2 B'D (4005185640)
AN401 LD601-602 LD603 LD604 R601-606 R607-610 4355824511 2308252262 2308252302 2308252222 3009392973 3009472973 CON ASS'Y 5P LED RED SLR-54MG R5 GRE ROHM LED REF SLR 54DU R5 YEL LED REF SLR-54UR R5 RED ROHM RES CF 3.9K 1/5W J N RES CF 4.7K 1/5W J N ASS'Y 5P R5GR R5OR R5RE 3.9K 4.7K

4355789721 3409210141-T

CON ASS'Y 3P VR CAP AF RSG 100UF 25V 6P

ASS'Y 3P 100/25

3529050311-A 3529220311-A

CAP CE SL 5P 50V M AXIAL CAP CE SL 22PF 50V J AXIAL

5P 22P

LED 2/2 B'D (4005185650)
AN402 4355824503 LD701, LD702 2308252262 LD703 2308252302 LD704 2308252222 R701-706 3009392973 R707-710 3009472973 CON ASS'Y 5P LED REF SLR-54MG R5 GRE ROHM LED REF SLR 54DU R5 YEL LED REF SLR-54UR R5 RED ROHM RES CF 3.9K 1/5W J N RES CF 4.7K 1/5W J N ASS'Y 5P R5GR R5OR R5RE 3.9K 4.7K

0dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power) * Using reactive 2 speakers at high power levels may cause overheating, excessive power consumption, and shutdowns. Please note that below 2 the PC limiter will work. Before using 2 speakers in a real application, test the system completely.

3409210071-T

CAP AF 10UF 50V 5P

10/50

* Specifications and design subject to change without notice for improvements.

2

3

TOP AND BOTTOM VIEW OF P.C. BOARD
Ref No.
C101 C103, C105 C106-109 C111-112, C117, C120 C114 C118-119 C122 C123 CN101, CN104 CN102 CN103 CN106-108 CR102, CR115-116 CR104 CR110 CR113 CR124-125 CR123 D101, D105-106, D124, D134 D103-104, D107-114, D119-120, D123 D116, D118 D121-122 D126, D125 IC101 IC102 L101 Q101, Q104 Q102 Q103, Q137 Q105 Q106 Q106 Q107 Q107 Q108 Q108 Q109 Q110 Q111 Q111 Q121-126 Q121-126 Q127, Q138 Q131-136 Q131-136 R101 R102 R103 R104 R105, R110, R129-130 R106 R107 R107 R108 R109 R109 R111-112 R113 R114 R115, R131-132 R116-117, R177, R179, R184 R118-119, R125

Part No.
3409247041-T 3409210141-T 3409247971-T 3609472120-T 3609473120-T 3609273120-T 3409247071-T 3409810141-T 4428599002 4428595005 4428595006 4465998210 3509101231-A 3529330311-A 3529680311-A 3529050311-A 3509331231-A 3529220311-A 2058100996

Description
CAP AF RSG 47UF 25V 5P CAP AF RSG 100UF 25V 6P CAP AF RSG 4.7UF 50V 5P CAP MA 0.0047UF 100V J CAP MA 0.047UF 100V CAP MA 0.027UF 100V J CAP AF RSG 47UF 50V 6P CAP AF NP 100UF 25V WAFER YW025-02 LW5267/LWB0640/2.5MM-05P LW5267/LWB0640/2.5MM-06P TERMINAL (250) PCB TAB CAP CE B 100PF 50V K AXIAL CAP CE SL 33PF 50V J AXIAL CAP CE SL 68PF 50V J AXIAL CAP CE SL 5P 50V M AXIAL CAP CE B 330PF 50V K AXIAL CAP CE SL 22PF 50V J AXIAL DIODE RECTIFIER LT1N4006 (4007)

Value
47/25 100/25 4.7/50 0.0047/100 (M) 0.047/100 (M) 0.027/100 (M) 47/50 100/25 NP YW025-02P WAFMW5P2.54 WAFMW6P2.54 100P 33P 68P 5P 330P 22P 1N 4006

Ref No.
R120, R146-151, R164-169 R121 R122-123 R124 R126 R127-128 R133 R134-139, R152-157 R140-145, R158-163 R170-171 R172-173 R172-173 R174 R175-176, R185 R178 R180 R181 R182-183 R186-187 RY501 TH101 TH102 VR101

Part No.
3089101275

Description
RES NFR 100 1/4W J R PHILKO

Value
FR 100

3079121275 3009393273 3079121275 3009122973 3039223475 3089150275 3089479275 3049478783 3089332275 3009823973 3009124973 3039479572-F 3009223973 3009184973 3009682973 3009473973 3009822973 3009150973 5528009810 2438007993 2438007995 3248322220

RES ERD-2FCVG 121T 1/4W R RES CF 39K 1/4W J RES ERD-2FCVG 121T 1/4W R RES CF 1.2K 1/5W J N RES MO 22K 1W R RES NFR 15 1/4W J R PHILKO RES NFR 4.7 1/4W J R PHILKO RES CE 0.47 5W J T HAN NAE RES NFR 3.3K 1/4W J R PHILKO RES CF 82K 1/5W J N M-1500 RES CF 120K 1/5W J N M-2000 RES MO 4.7 2W J N RES CF 22K 1/5W J N RES CF 180K 1/5W J N RES CF 6.8K 1/5W J N RES CF 47K 1/5W J N RES CF 8.2K 1/5W J N RES CF 15 1/5W J N RELAY VKP-31H42 POSISTOR PTH 9M04 BE 222TS 2F POSISTOR PTH 9M04 BH 471TS 2F RES SEMI CS 2.2KB 10/5

FR 120 39K 1/4W FR 120 1.2K 22K 1W FR 15 FR 4.7 0.47 5W FR 3.3K 82K 120K 4.7 2W 22K 180K 6.8K 47K 8.2K 15 31H42 BE222TS BH471TS 2.2KB

2058304100

DIODE IN4148

1N 4148

2058512190 2058322100 2058100110 2118010232 2118050410 2648099940 2028407990 2028107984 2008207100-T 2008400960 2008206997-T 2008005999 2008606107-T 2008405999 2028407990 2028407995 2028811998 2028611998 2028107984 2028107995 2028407122 2028407888 2008606108-T 2028107118 2028107944 3009561973 3009113973 3009331973 3009121973 3079151275 3009202973 3002470953 3009303973 3009222973 3002180953 3009303973 3009564973 3079331275 3079680275 3079470275 3009104973

DIODE ZENER 10V 1W (IN4740A) DIODE 1SS145 ROHM DIODE PS2010 PYUNG CHANG IC NJM072D JRC IC TA7317P TOSHIBA COIL INDUCTOR 1.2UM TR NPN 2SC 3298A(Y), KTC4370A(Y) TR PNP 2SA 1306A (Y), KTA1659A(Y) TR PNP 2SA 970BL-TPE2 TR NPN 2SC 1567A-R MATSUSHITA TR PNP KTA 949Y (KTA 1024) KEC M-1500 TR PNP 2SA 1546 NEC M-2000 TR NPN KTC 2229Y (KTC 3206Y) M-1500 TR NPN 2SC4001 NEC M-2000 TR NPN 2SC 3298A(Y), KTC4370A(Y) M-1500 TR NPN MJE15032 (MOTOROLA) M-2000 FET N-CH 2SK215 HITACHI FET P-CH 2SJ 78 HITACHI TR PNP 2SA 1306A(Y), KTA 1659A(Y) M-1500 TR PNP MJE15033 (MOTOROLA) M-2000 TR NPN 2SC5200 TOSHIBA (M-1500) TR NPN 2SC 3264 W/ACC (M-2000) TR NPN KTC2240BL (KTC 3200BL) TR PNP 2SA1943 TOSHIBA (M-1500) TR PNP 2SA 1295 W/ACC (M-2000) RES CF 560 1/5W J N RES CF 11K 1/5W J N RES CF 330 1/5W J N RES CF 120 1/5W J N RES ERD-2FCVG 151T 1/4W R RES CF 2K 1/5W J N RES CF 47K 1/5W F N M-1500 RES CF 30K 1/5W J N M-2000 RES CF 2.2K 1/5W J N RES CF 18K 1/5W FN M-1500 RES CF 30K 1/5W J N M-2000 RES CF 560K 1/5W J N RES ERD-2FCVG 331T 1/4W R RES ERD-2FCVG 680T 1/4W R RES ERD-2FCVG 470T 1/4W R RES CF 100K 1/5W J N

UZ 10BM/1W 1SS142 PS207 NJM 072D TA 7317P 1.2uH KTC 4370 2SA 1659 2SA 970BL 2SC 1567A KTA 949Y 2SA 1546 KTC 2229Y 2SC 4001 2SC 4370A MJE15032 2SK 215 2SJ 78 KTA 1659 MJE15033 2SC5200 2SC3264 KTC 2240BL 2SA1943 2SA1295 560 11K 330 120 FR150 2K 47K 1% 30K 2.2K 18K 1% 30K 560K FR 330 FR 68 FR 47 100K

3009562973

RES CF 5.6K 1/5W J N

5.6K

4

5

WIRING DIAGRAM

6

7

BLOCK DIAGRAM

8

SCHEHATIC DIAGRAM

9

10

EXPLODED VIEW OF CABINET & CHASSIS/MECHANICAL PARTS LIST

S2

S14 S13 S12 S11 S10 S9

3WPTC 3X8B SCREW 2BTC 3X8B ASS'Y SCREW PM 4X8B SCREW 2FTC 3X12B SCREW 2BTC 3X10B SCREW 2WPTC 3X14B ASS'Y PM 4X18B SCREW FM 4X20B HEX MSPM 3X12Y ASS'Y PM3X22B SCREW 3BTC 4X14Y SCREW 3BTC 4X8B SCREW 3BTC 3X6B SCREW BM 3X6N PART NAME

8159340083 8109230083 8095996910 8129230123 8109230103 8159230143 8095996930 8029140203 8099130121 8095997110 8109340141 8109340083 8109330063 8009130064 PART NUMBER

1 2 8 4 13 4 1 8 34 6 4 14 15 5 M-1500 Q'TY 1 1 1 0 1 1 2 1 1 1 1 1 0 1 1 0 1 1 4 1 1 1 0 2 2 0 2 0 4 3 3 1 1 2 2 2 2 1 0 2 0 1 1 M-1500 Q'TY

1 2 8 4 13 4 1 8 58 6 4 14 15 5 M-2000 REAMRK

4

S8 S7 S6
22

S5 S4 S3 S2 S1 NO.

S1

27

36 35 34 33

SLIDE KNOB SHIELD FENCE B'D VR SPONGE B'D LED 1/2 B'D LED 1/2 B'D AMP B'D OUTPUT B'D INPUT B'D POWER WASHER SPRING NUT M10B POWER TRANS AC CORD CAP RUBBER SPONGE CIRCUIT BREAKER RUBBER FOOT BKT GUIDE BKT CORD STOPER FAN COVER BKT (REAR) FAN FAN BKT SPACER SPACER HOLDER DIODE POWER SW BKT KNOB (CONTROL) BKT (HANDLE) HANDLE TOP COVER HEAT SINK CHASSIS MAIN PANEL FRONT PART NAME 0B

8545084520 6163195710 4005185620 6735981710 4005185640 4005185650 4005185800 4005185630 4005185610 4005185600 8309100013 8209110013 2828063710 2828063810 4308997310 6715993320 5568224433 5568224833 6335000610 6503971810 046505933510 6518999810 8538999510(102mm) 8538999610(92mm) 6505936210 7308998510 7308998320 6503976210 6505953820 6705998510 6705998410 2058100998 4625996611 6505940110 048543985918 6505935710 048603995230 046123495310 7502089820 7502089810 046121677811 046121677821 048602969011 PART NUMBER

1 1 1 1 1 1 2 1 1 1 1 1 1 0 1 4 1 1 4 1 1 1 2 0 2 2 0 4 0 3 3 1 1 2 2 2 2 1 2 0 1 0 1 M-2000 REAMRK M-2000 M-1500 M-2000 M-1500 M-2000 M-1500 M-2000 M-1500 M-2000 M-1500 M-2000 E B EUROPE M-2000 M-1500 M-2000

S5

28 35

36

24 23

32 31 30 29

33 S6

S3

29

19 18 21

28 27
17

26 25 24

10 S12 S8

S10

23
S11 16 S7 S13

22 21 20 19 18 17

S4

34 8 15

16 15 14
S14 13 14

32

13 12 11 10 9 8 7 6

S3

3 7 31 2 S12 30

5 4 3

26 9 S2 25 S9

20

2 1 NO.

6

S5

11

1 12 S6 5

11

12

ASS'Y DRAWING

13

14

NOTE

NOTE