QSC ISA 280 Technical & Service Manual Download

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Technical Ser

vice Manual

ISA™ Series

▲

ISA280

▲

ISA300T

▲

ISA300Ti

▲

ISA450

▲

ISA500T

▲

ISA500Ti

▲

ISA750

▲

ISA800T

▲

ISA800Ti

▲

ISA1350

*TD-000163-00*

TD-000163-00

Rev. B

QSC Audio Products, LLC
Costa Mesa, CA 92626 USA

www.qscaudio.com

RoHS

Summary of Contents for ISA 280

Page 1: ...l Service Manual ISA Series ISA280 ISA300T ISA300Ti ISA450 ISA500T ISA500Ti ISA750 ISA800T ISA800Ti ISA1350 TD 000163 00 TD 000163 00 Rev B QSC Audio Products LLC Costa Mesa CA 92626 USA www qscaudio...

Page 2: ......

Page 3: ...qscaudio Postal 1665 MacArthur Blvd Costa Mesa California 92626 USA E mail tech_support qscaudio com Web http www qscaudio com product information and support http www qscstore com parts and accessor...

Page 4: ...2 QSC Audio Products LLC TD 000163 00 Rev B ISA amplifier rear view...

Page 5: ...2 Component identification and pinout 15 NE5532AN Dual operational amplifier 15 LM311 Voltage comparator 15 4N29 Opto isolator 15 LM13600 Dual operational transconductance amplifier 15 2N5064 Sensitiv...

Page 6: ...ISA450 before May 2006 40 Main PCB Assembly ISA450 41 PCB Assembly AC Input ISA280 300Ti 300T 450 500Ti 500T 43 6 5 ISA500T parts and assemblies 44 ISA 500T Power Amplifier 44 Chassis Assembly ISA 50...

Page 7: ...0 5 THD direct outputs 3000 50V 50 Hz 16 kHz 0 5 THD 480 ISA 300Ti 800 ISA 500Ti 1280 ISA 800Ti DYNAMIC HEADROOM 2 dB 4 2 dB 4 2 dB 4 2 dB 4 DISTORTION SMPTE IM 0 01 0 01 0 02 0 02 FREQUENCY RESPONSE...

Page 8: ...HD 15 female COOLING Continuously variable speed fan back to front air flow AMPLIFIER PROTECTION Full short circuit open circuit thermal ultrasonic and RF protection Stable into reactive or mismatched...

Page 9: ...must also not be contaminated by hazardous substances such as lead Therefore you cannot use the same soldering and desoldering tools for RoHS compliant products and solder as you do for non compliant...

Page 10: ...h tweezers Melt the small mound of solder with the iron and place the component across the two pads in the correct orientation if the component is sensitive to direction and press it flat against the...

Page 11: ...process until all the pins are free and you can remove the component Insertion 1 With a soldering iron and appropriate solder melt just enough solder onto one pad to create a small mound of solder It...

Page 12: ...ervoirs for short term transient demands The supply provides a bipolar set of supply rails for each channel with equal quiescent positive and negative voltages as shown in Figure 1 7 Note that unlike...

Page 13: ...ators in between for the best possible transfer of heat away from the transistors The emitters of the PNP and NPN transistors are coupled through resistors to the positive and negative supply rails re...

Page 14: ...try it is vital to keep both running as mirror images A protection circuit monitors the balance between Channel 1 s and Channel 2 s signals Resistors R22 and R23 R22A R22B R23A and R23B in the ISA 750...

Page 15: ...in series pairs instead of single 200 k components Bias circuitry The new circuitry see Figure 1 13 for the bias network features transistors Q108 and Q109 with surrounding resistors forming 8 mA curr...

Page 16: ...r is turned on Channel 1 was most susceptible and various circumstances tended to aggravate the problem such as having the low frequency filters engaged having an accessory powered by the DataPort etc...

Page 17: ...UTPUT BALANCE STROBE BALANCE V 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A B NON INVERTING INPUT A V AMP BIAS INPUT B NON INVERTING INPUT B INVERTING INPUT B OUTPUT B BUFFER INPUT B BUFFER OUTPUT B V DIO...

Page 18: ...1 2 3 B E C B C E TOSHIBA G D S B C E 2N3904 NPN and 2N3906 PNP Small signal transistors MJE15032 NPN and MJE15033 PNP Driver transistors IRFZ44 TMOS power field effect transistor 2SC5200 PNP and 2SA...

Page 19: ...customer complains of blowing circuit breakers or fuses or burning smell or smoke Symptoms covered Fuses blow immediately The amplifier quickly gets very hot Line circuit breakers trip at turn on The...

Page 20: ...hannel 2 are misadjusted Check R157 R158 R198 ISA750 and ISA800Ti only D115 and D116 Channel 1 or R157 R258 R298 ISA750 and ISA800Ti only D215 and D216 Channel 2 ISA280 ISA300Ti ISA450 and ISA500Ti Ch...

Page 21: ...rail balancing problems Symptoms covered Insufficient or excessive current limiting into a shorted load Op amp rails too high with a shorted load Uneven voltages on supply rails A channel s output cu...

Page 22: ...nly due to unequal rail voltages this voltage divider is the likely culprit Calibrations Adjust ISA280 ISA300T ISA300Ti ISA450 ISA500T ISA500Ti ISA750 ISA800T ISA800Ti ISA 1350 Channel 1 bias DC volta...

Page 23: ...control 4 1 Setting bias Always set the bias after replacing any output or driver transistor after replacing any diode or resistor in the driver output circuitry if the amplifier seems to run too hot...

Page 24: ...ical 6 Turn the gain control down If the amp has begun to warm up shut it off and let it cool a few minutes before proceeding with Channel 2 7 Repeat steps 1 through 5 for Channel 2 Use trimpots R239...

Page 25: ...w the transistors and the clamps from the heat sink then unscrew the circuit boards from the mounting plate 8 Before reassembling the channel module assembly lightly apply fresh heat sink compound ove...

Page 26: ...y 2006 100V and 120V only WP 002800 02 ISA 280 CHASSIS ASSY 230V 1 Before May 2006 230V only including UK WP 002800 03 ISA 280 CHAS ASSY 220V 60HZ 1 Before May 2006 220V Korea only WP 002803 00 ISA 28...

Page 27: ...PUT ISA 120V 1 100V and 120V only Panelized assembly see WP 004502 00 list for individual channel modules WP 004502 02 PCB ASSY AC INPUT ISA 230V 1 230V including UK and Korea only Panelized assembly...

Page 28: ...004502 02 PCB ASSY AC INPUT ISA 230V 1 230V including Korea and UK only Panelized assembly see WP 004502 02 list for individual channel modules XF 000193 GP PWR XFMR ISA 280 300T 1 Main PCB Assembly I...

Page 29: ...7MM RED W STAND 2 LD100A LD200A QD 000198 GP LED 4 7MM GRN W STAND 3 LD1A LD101A LD201A QD 000201 GP DIODE LL4148 SM 35 D2 D7 D9 D14 D16 18 D102 D106 D111 D116 D119 D202 D206 D211 D216 D219 QD 000202...

Page 30: ...22 R23 RE 239001 GP RMG 1 10W 39K 5 0805 2 R107 R207 RE 247004 GP RMG 1 8W 47K 5 1206 2 R125 R225 RE 268002 GP RMG 1 8W 68K 5 1206 1 R33 RE 315003 GP RMG 1 8W 150K 5 1206 3 R10 R104 R204 RE 315004 GP...

Page 31: ...7 GP BRIDGE RECT 400V 25A 2 BR100 BR200 RE 000005 GP POLYSWITCH 1 1A 0 15 OHM 1 5W 1 R1 RE 000270 GP NTC 30A 1 OHM 1 R21 RE 010009 GP 100 OHM POT PCB MOUNT 1 R231 RE 012003 GP RMF 3W 120 OHM 5 AL META...

Page 32: ...120V 1 WP 000305 02 ISA 300T CHASSIS ASSY 230V 1 WP 000305 03 ISA 300T CHAS ASSY 220V 60HZ 1 Chassis Assembly ISA300T 120V QSC part WP 000305 00 230V QSC part WP 000305 02 220V Korea QSC part WP 00030...

Page 33: ...56001 GP CC 50V 56PF 10 0805 2 C110 C210 CA 056002 GP CTC 200V 56PF 5 1206 2 C111 C211 CA 118000 GP CC 50V 180PF 5 0805 4 C101 C103 C201 C203 CA 122005 GP CC 50V 220PF 5 0805 4 C20 C23 CA 210011 GP 0...

Page 34: ...250V MJE15033 2 Q106 Q206 QD 000213 GP TR KST42 1 Q1 QD 000252 GP DIODE ZENER 25W 4 7V 4 D107 D110 D207 D210 RE 02201 GP 0 22 OHM 5 3W THK FLM 12 R142 R148 R149 R152 R153 R159 R242 R248 R249 R252 R25...

Page 35: ...2 R107 R207 RE 247004 GP RMG 1 8W 47K 5 1206 2 R125 R225 RE 268002 GP RMG 1 8W 68K 5 1206 1 R33 RE 315003 GP RMG 1 8W 150K 5 1206 3 R10 R104 R204 RE 315004 GP RMG 1 8W 150K 1 1206 4 R118 R119 R218 R21...

Page 36: ...0V 1 100V and 120V only WP 000325 02 ISA 300TI CHASSIS ASSY 230V 1 230V only except Korea WP 000325 03 ISA 300TI CHAS ASSY 220V 60HZ 1 Korea only Chassis Assembly ISA300Ti beginning June 2006 120V QSC...

Page 37: ...120V only WP 004502 02 PCB ASSY AC INPUT ISA 230V 1 230V only XF 000193 GP PWR XFMR ISA 280 300T 1 XF 000268 GP LINE ISA XFMR ISA 300TI 2 Chassis Assembly ISA300Ti before June 2006 120V QSC part WP 0...

Page 38: ...CB Assembly ISA300Ti QSC part WP 000326 00 This assembly is a panelized construction comprising the two channel modules built on a common perforated circuit board For the channel 1 module the one on t...

Page 39: ...1 Q12 Q101 Q102 Q201 Q202 QD 000205 GP XISTOR PNP 40V 0 2A TR3906 SOT 23 6 Q4 Q5 Q7 Q13 Q100 Q200 QD 000206 GP DIOD RECT FAST IN4934 AT 4 D108 D109 D208 D209 QD 000207 GP XISTOR NPN 250V 0 5A MJE15032...

Page 40: ...10W 20K 1 0805 5 R52 R150 R151 R250 R251 RE 224001 GP 24 0K 1 1 10W THK FLM 0805 5 R19 R117 R121 R217 R221 RE 233001 GP RMG 1 8W 33K 1 1206 2 R22 R23 RE 239001 GP RMG 1 10W 39K 5 0805 2 R107 R207 RE...

Page 41: ...CHASSIS ASSY 230V 1 Before May 2006 230V only WP 004500 03 ISA 450 CHAS ASSY 220V 60HZ 1 Before May 2006 220V Korea only WP 004503 00 ISA 450 CHASSIS ASSY 120V 1 Beginning May 2006 100V and 120V only...

Page 42: ...004500 03 QSC Part Description Qty Reference Comments CH 000153 GP CHASSIS FAB ISA 1 CH 000166 GP RACK EAR ISA 2 CH 000173 GP COVER XFMR STEEL LARGE 1 CH 000178 GP PROTECT COVER 1 CO 000211 GP AC INL...

Page 43: ...20 0805 1 C5 CA 322006 GP CM 50V 022UF 5 RL 4 C116 C119 C216 C219 CA 322007 GP CC 50V 022UF 10 0805 2 C125 C225 CA 368004 GP 0 068UF 5 250V FILM DIPPED 2 C124 C224 CA 410013 GP CER 2 1206 10 50V 1UF...

Page 44: ...OHM 5 5 R20 R146 R147 R246 R247 RE 000003 GP RMG 1 10W 0 OHM 5 0805 2 R265 R266 RE 000004 GP RMG 1 8W 0 OHM 5 1206 1 R53 RE 000250 GP NTC RES 50 OHM 2 R134 R234 RE 000260 GP THERMAL PTC 60C 100 OHM 2...

Page 45: ...R218 R219 RE 322001 GP RMG 1 8W 220K 5 1206 1 R27 RE 322002 GP RMG 1 10W 220K 5 0805 1 R26 RE 330001 GP RMG 1 8W 330K 5 1206 1 R18 RE 347002 GP RMF 1 8W 470K 5 ATS 1 R15 RE 368001 GP RMG 1 8W 680K 1...

Page 46: ...P 000505 02 ISA 500T CHASSIS ASSY 230V 1 WP 000505 03 ISA 500T CHAS ASSY 220V 60HZ 1 Chassis Assembly ISA 500T 120V QSC part WP 000505 00 230V QSC part WP 000505 02 220V Korea QSC part WP 000505 03 QS...

Page 47: ...nts CA 056001 GP CC 50V 56PF 10 0805 2 C110 C210 CA 056002 GP CTC 200V 56PF 5 1206 2 C111 C211 CA 118000 GP CC 50V 180PF 5 0805 4 C101 C103 C201 C203 CA 122005 GP CC 50V 220PF 5 0805 4 C20 C23 CA 2100...

Page 48: ...5200 8 Q104 Q108 Q110 Q112 Q204 Q208 Q210 Q212 QD 000210 GP XISTOR PNP 250V MJE15033 2 Q106 Q206 QD 000213 GP TR KST42 1 Q1 QD 000252 GP DIODE ZENER 25W 4 7V 4 D107 D110 D207 D210 RE 02201 GP 0 22 OHM...

Page 49: ...7004 GP RMG 1 8W 47K 5 1206 2 R125 R225 RE 268002 GP RMG 1 8W 68K 5 1206 1 R33 RE 315003 GP RMG 1 8W 150K 5 1206 3 R10 R104 R204 RE 315004 GP RMG 1 8W 150K 1 1206 4 R118 R119 R218 R219 RE 322001 GP RM...

Page 50: ...TI CHASSIS ASSY 120V 1 WP 000525 02 ISA 500TI CHASSIS ASSY 230V 1 WP 000525 03 ISA 500TI CHAS ASSY 220V 60HZ 1 Chassis Assembly ISA500Ti 120V QSC part WP 000525 00 230V QSC part WP 000525 02 220V Kore...

Page 51: ...hannel modules built on a common perforated circuit board For the channel 1 module the one on top order PCB QZ050C PWR1 for the channel 2 module the one underneath order PCB QZ050C PWR2 QSC Part Descr...

Page 52: ...06 GP DIOD RECT FAST IN4934 AT 4 D108 D109 D208 D209 QD 000207 GP XISTOR NPN 250V 0 5A MJE15032 3 Q10 Q105 Q205 QD 000208 GP XISTOR PNP 230V 5A 2SA1943 8 Q103 Q107 Q109 Q111 Q203 Q207 Q209 Q211 QD 000...

Page 53: ...5 R19 R117 R121 R217 R221 RE 233001 GP RMG 1 8W 33K 1 1206 2 R22 R23 RE 239001 GP RMG 1 10W 39K 5 0805 2 R107 R207 RE 247004 GP RMG 1 8W 47K 5 1206 2 R125 R225 RE 268002 GP RMG 1 8W 68K 5 1206 1 R33 R...

Page 54: ...7500 02 ISA 750 CHASSIS ASSY 230V 1 230V only including UK WP 007500 03 ISA 750 CHAS ASSY 220V 60HZ 1 220V Korea only WP 007503 00 ISA 750 CHASSIS ASSY 120V 1 100V and 120V only WP 007503 02 ISA 750 C...

Page 55: ...XFMR STEEL LARGE 1 CH 000178 GP PROTECT COVER 1 CO 000211 GP AC INLET 250V 15A 1 CO 000218 GP 6 POLE SPEAKER TERMINAL 1 LB 000355 GP LABEL GROUND 1 LB 000410 GP LABEL UL LISTED 1 LB 000449 GP LABEL RE...

Page 56: ...50V 01UF 20 0805 3 C5 C181 C281 CA 322006 GP CM 50V 022UF 5 RL 4 C116 C119 C216 C219 CA 322007 GP CC 50V 022UF 10 0805 2 C133 C233 CA 368004 GP 0 068UF 5 250V FILM DIPPED 4 C124 C126 C224 C226 CA 3820...

Page 57: ...215 GP DIODE MUR1520 15A 200V 4 D175 D176 D275 D276 QD 000216 GP THYRISTOR 200V 0 1W 2N5064 2 D219 D220 QD 000217 GP DIODE 400V 3A IN5404 DO 201AD 4 D117 D118 D217 D218 QD 000218 GP DIOD ZNR 3 8 4 0V...

Page 58: ...R207 RE 247004 GP RMG 1 8W 47K 5 1206 2 R125 R225 RE 247005 GP RMG 1 10W 47K 5 0805 4 R176 R183 R276 R283 RE 268002 GP RMG 1 8W 68K 5 1206 5 R33 R22A R22B R23A R23B RE 315003 GP RMG 1 8W 150K 5 1206...

Page 59: ...R50B RE 010009 GP 100 OHM POT PCB MOUNT 1 R131 RE 012003 GP RMF 3W 120 OHM 5 AL METAL 1 R17 RE 110013 GP RMG 1 10W 1K 1 0805 1 R50A RE 120003 GP RCF 1 8W 2K 5 ATS 1 R13 RE 122006 GP SVR 2 2K H3 7X7 2...

Page 60: ...nd 120V only WP 000805 02 ISA 800T CHASSIS ASSY 230V 1 230V only except Korea WP 000805 03 ISA 800T CHASSIS ASSY 220V 60HZ 1 220V Korea Chassis Assembly ISA800T 120V QSC part WP 000805 00 230V QSC par...

Page 61: ...201 C203 CA 210012 GP CM 100V 001UF 5 RL 5X 2 C131 C231 CA 215004 GP CM 250V 0015UF 5 RL 2 C114 C214 CA 222007 GP 50V 0022UF 10 1206 4 C115 C117 C215 C217 CA 233004 GP CM 50V 0033UF 5 RL 4 C172 C179 C...

Page 62: ...208 GP XISTOR PNP 230V 5A 2SA1943 8 Q103 Q107 Q109 Q111 Q203 Q207 Q209 Q211 QD 000209 GP XISTOR NPN 230V 5A 2SC5200 8 Q104 Q108 Q110 Q112 Q204 Q208 Q210 Q212 QD 000210 GP XISTOR PNP 250V MJE15033 2 Q1...

Page 63: ...182002 GP RMF 5W 8 2K 5 AL METAL 8 R118 R119 R133 R135 R218 R219 R233 R235 RE 210007 GP 10K 1 1 10W THK FLM 0805 20 R22 R23 R31 R34 R38 R100 R101 R103 R105 R106 R128 R200 R201 R203 R205 R206 R228 RE...

Page 64: ...A 800TI CHASSIS ASSY 120V 1 100V and 120V only WP 000825 02 ISA 800TI CHASSIS ASSY 230V 1 230V only Chassis Assembly ISA800Ti 120V QSC part WP 000825 00 230V QSC part WP 000825 02 220V Korea QSC part...

Page 65: ...200V 27PF 5 1206 2 C111 C211 CA 047005 GP CC 50V 47PF 5 0805 6 C170 C176 C177 C270 C276 C277 CA 056001 GP CC 50V 56PF 10 0805 2 C110 C210 CA 110004 GP CC 50V 100PF 10 0805 2 C9 C132 CA 110005 GP CC 50...

Page 66: ...4 SOT 23 16 Q5 Q8 Q9 Q11 Q12 Q16 Q18 Q101 Q102 Q171 Q173 Q201 Q202 Q271 Q273 QD 000205 GP XISTOR PNP 40V 0 2A TR3906 SOT 23 12 Q4 Q6 Q7 Q13 Q15 Q100 Q172 Q175 Q200 Q272 Q275 QD 000206 GP DIOD RECT FAS...

Page 67: ...51003 GP RMF 5W 5 1K 5 AL METAL 4 R180 R188 R280 R288 RE 159003 GP 5 9K 1 1 10W THK FLM 0805 4 R171 R184 R271 R284 RE 175003 GP RMG 1 10W 7 5K 5 0805 2 R108 R208 RE 182002 GP RMF 5W 8 2K 5 AL METAL 8...

Page 68: ...y May 2006 and later Chassis Assembly ISA1350 beginning May 2006 120V QSC part WP 013503 00 230V QSC part WP 013503 02 220V Korea QSC part WP 013503 03 QSC Part Description Qty Reference Comments LB 0...

Page 69: ...H 000231 GP PCB HOLDER RMX 4050HD 1 CH 000232 GP HEATSINK RMX 4050HD 1 CH 000247 GP CLAMP TRANSISTER 6 FINGER 1 CH 000248 GP CLAMP TRANSISTER 4 FINGER 1 CH 000308 GP NTC HOLDER 1 CH 000389 GP CHASSIS...

Page 70: ...5 R6 QD 000197 GP LED 4 7MM RED W STAND 1 LD5 QD 000198 GP LED 4 7MM GRN W STAND 3 LD1 LD3 LD6 QD 000200 GP DIODE RECT 1A 200V DB103 2 BR7 BR8 QD 000201 GP DIODE LL4148 SM 6 D1 D6 QD 000203 GP DIOD ZN...

Page 71: ...2 R50 R112 RE 112001 GP RMG 1 10W 1 2K 1 0805 1 R111 RE 115006 GP 1 5K 1 1 8W THK FLM 1206 3 R23 R26 R27 RE 115008 GP 1 5K 1 PCNT 1 10W THK FLM 0805 100V 1 R211 RE 116902 GP 1 69K 1 1 4W AT 1 R19 RE 1...

Page 72: ...ISATI ISA SERIES NEW 1 TD 000900 AX WARRANTY CARD GENERIC 1 TS 000004 WR 3 YEARS WARRANTY 3 WC 0 6023 GP 0 6 JUMPER 23AWG 16 J34 J45 J53 J56 WC 000181 GP AC CORD 15A ISA 1 WC 000183 GP SLEEVE 7086 2...

Page 73: ...Technical Service Manual 71 ISA Series Power Amplifiers Chassis assembly ISA280 7 Schematics and diagrams 7 1 ISA Series Chassis Assemblies...

Page 74: ...72 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA280 ISA300T...

Page 75: ...Technical Service Manual 73 ISA Series Power Amplifiers Chassis assembly ISA300T M4 X 20MM 46...

Page 76: ...74 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA300Ti...

Page 77: ...Technical Service Manual 75 ISA Series Power Amplifiers Chassis assembly ISA300Ti...

Page 78: ...76 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA450...

Page 79: ...Technical Service Manual 77 ISA Series Power Amplifiers Chassis assembly ISA450...

Page 80: ...78 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA500T M4 X 20MM 46...

Page 81: ...Technical Service Manual 79 ISA Series Power Amplifiers Chassis assembly ISA500T ISA500Ti...

Page 82: ...80 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA500Ti M4 X 20MM 46...

Page 83: ...Technical Service Manual 81 ISA Series Power Amplifiers Chassis assembly ISA750...

Page 84: ...82 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA750...

Page 85: ...Technical Service Manual 83 ISA Series Power Amplifiers Chassis assembly ISA800T M4 X 20MM 46...

Page 86: ...84 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA800T...

Page 87: ...Technical Service Manual 85 ISA Series Power Amplifiers Chassis assembly ISA800Ti...

Page 88: ...86 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA800Ti...

Page 89: ...Technical Service Manual 87 ISA Series Power Amplifiers Chassis assembly ISA1350...

Page 90: ...88 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA1350...

Page 91: ...Technical Service Manual 89 ISA Series Power Amplifiers Chassis assembly ISA1350...

Page 92: ...90 QSC Audio Products LLC TD 000163 00 Rev B Chassis assembly ISA1350...

Page 93: ...Technical Service Manual 91 ISA Series Power Amplifiers...

Page 94: ...92 QSC Audio Products LLC TD 000163 00 Rev B...

Page 95: ...Technical Service Manual 93 ISA Series Power Amplifiers...

Page 96: ...94 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 280 Early version page 1 of 3 7 2 ISA280 1st generation Schematics...

Page 97: ...Technical Service Manual 95 ISA Series Power Amplifiers Gray shading indicates signal path ISA 280 Early version page 2 of 3...

Page 98: ...96 QSC Audio Products LLC TD 000163 00 Rev B ISA 280 Early version page 3 of 3...

Page 99: ...Technical Service Manual 97 ISA Series Power Amplifiers Gray shading indicates signal path ISA 280 Revised version March 2003 page 1 of 3 7 3 ISA280 revised Schematics...

Page 100: ...98 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 280 Revised version page 2 of 3 March 2003...

Page 101: ...Technical Service Manual 99 ISA Series Power Amplifiers ISA 280 Revised version page 3 of 3 March 2003...

Page 102: ...D FILE NO SH8001ra sch REV A ISA 300T page 1 of 3 THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION THAT IS THE PROPERTY OF QSC AUDIO PRODUCTS WHICH MAY NOT BE DISCLOSED REPRODUCED OR USED WITHOUT EXPRES...

Page 103: ...EV A ISA 300T page 2 of 3 THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION THAT IS THE PROPERTY OF QSC AUDIO PRODUCTS WHICH MAY NOT BE DISCLOSED REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM Q...

Page 104: ...RED WHT WHT J3A TABLE 1 AC LINE VOLTAGE POWER TRANSFORMER PRIMARY LEAD COLOR TAB 100V 120V 240V CIRCUIT BREAKER 15A 125V 15A 125V 7 5A 250V R21 1 OHM 30A 1 OHM 30A 2 5 OHM 15A R21A 0 OHM JUMPER 0 OHM...

Page 105: ...Technical Service Manual 103 ISA Series Power Amplifiers Gray shading indicates signal path ISA 300Ti page 1 of 3 7 5 ISA300Ti Schematics...

Page 106: ...104 QSC Audio Products LLC TD 000163 00 Rev B ISA 300Ti page 3 of 3...

Page 107: ...Technical Service Manual 105 ISA Series Power Amplifiers ISA 300Ti page 3 of 3...

Page 108: ...106 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 450 Early version page 1 of 3 7 6 ISA450 1st generation Schematics...

Page 109: ...Technical Service Manual 107 ISA Series Power Amplifiers Gray shading indicates signal path ISA 450 Early version page 2 of 3...

Page 110: ...108 QSC Audio Products LLC TD 000163 00 Rev B ISA 450 Early version page 3 of 3...

Page 111: ...Technical Service Manual 109 ISA Series Power Amplifiers Gray shading indicates signal path ISA 450 Revised version March 2003 page 1 of 3 7 7 ISA450 revised Schematics...

Page 112: ...110 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 450 Revised version March 2003 page 2 of 3...

Page 113: ...Technical Service Manual 111 ISA Series Power Amplifiers ISA 450 Revised version March 2003 page 3 of 3...

Page 114: ...SW1 10 PARALLEL INPUTS 4 5 BRIDGE MONO 6 7 FILTER BYPASS B 8 FILTER 30 HZ 9 CLIP LIM B 10 J101 CH1_ IN CH1_ IN CHASSIS_GND 2 3 1 PC 004508 00 INPUT PCB TO J421 PIN TO PIN SH 3 IN A IN A J400 1 J400 2...

Page 115: ...PPROX 40MA TO HD 15 PORT BR MONO RETURN CAUTION SENSITIVE NODE SW GND FOR CLIP LIM J401 1 J108 1 J401 2 J108 2 J401 3 J108 3 J421 2 J421 1 J421 3 J422 2 J345 2 J422 3 J345 3 J423 2 J348 2 J422 1 J345...

Page 116: ...J7A BLU BLK J2A RED WHT WHT J3A TABLE 1 AC LINE VOLTAGE POWER TRANSFORMER PRIMARY LEAD COLOR TAB 100V 120V 240V CIRCUIT BREAKER 15A 125V 15A 125V 7 5A 250V R21 1 OHM 30A 1 OHM 30A 2 5 OHM 15A R21A 0 O...

Page 117: ...Technical Service Manual 115 ISA Series Power Amplifiers ISA 500Ti page 1 of 3 Gray shading indicates signal path 7 9 ISA500Ti Schematics...

Page 118: ...116 QSC Audio Products LLC TD 000163 00 Rev B ISA 500Ti page 2 of 3 Gray shading indicates signal path...

Page 119: ...Technical Service Manual 117 ISA Series Power Amplifiers ISA 500Ti page 3 of 3...

Page 120: ...118 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 750 Early version page 1 of 3 7 10 ISA750 1st generation Schematics...

Page 121: ...Technical Service Manual 119 ISA Series Power Amplifiers Gray shading indicates signal path ISA 750 Early version page 2 of 3...

Page 122: ...120 QSC Audio Products LLC TD 000163 00 Rev B ISA 750 Early version page 3 of 3...

Page 123: ...Technical Service Manual 121 ISA Series Power Amplifiers Gray shading indicates signal path ISA 750 Revised version March 2003 page 1 of 3 7 11 ISA750 revised Schematics...

Page 124: ...122 QSC Audio Products LLC TD 000163 00 Rev B Gray shading indicates signal path ISA 750 Revised version March 2003 page 2 of 3...

Page 125: ...Technical Service Manual 123 ISA Series Power Amplifiers ISA 750 Revised version March 2003 page 3 of 3...

Page 126: ...IN SH 3 IN A IN A J400 1 J400 2 J400 3 J1 1 J1 2 J1 3 J203 1 J203 2 J203 3 1 2 3 1 2 3 GND IN A IN A J1 4 J203 4 J1 5 J203 5 J1 6 J203 6 J1 7 J203 7 J1 8 J203 8 J1 9 J203 9 J1 10 J203 10 J1 11 J203 11...

Page 127: ...INEAR GAIN POT CH 2 LINEAR GAIN POT R112 2 5K R212 2 5K SERIES REGULATOR SUPPLIES APPROX 40MA TO HD 15 PORT CONNECTS TO LOWER POS RAIL ON SAME SIDE AS DISPLAY LEDs BR MONO RETURN CAUTION SENSITIVE NOD...

Page 128: ...WER SWITCH IEC AC INLET LINE NEUT GND 20 VAC TO FAN POWER RECTIFIER 28V PRI SIDE DC FAN SUPPLY R4 60 C 100 ATTACH TO CH 2 HEAT SINK R7 60 C 100 ATTACH TO CH 1 HEAT SINK MAINTAIN FULL PRI SEC CREEPAGE...

Page 129: ...Technical Service Manual 127 ISA Series Power Amplifiers ISA800Ti page 1 of 3 Gray shading indicates signal path 7 13 ISA800Ti Schematics...

Page 130: ...128 QSC Audio Products LLC TD 000163 00 Rev B ISA800Ti page 2 of 3 Gray shading indicates signal path...

Page 131: ...Technical Service Manual 129 ISA Series Power Amplifiers ISA800Ti page 3 of 3...

Page 132: ...130 QSC Audio Products LLC TD 000163 00 Rev B Channel 2 Channel 1 7 14 ISA750 ISA800T ISA800Ti Component locations...

Page 133: ...Technical Service Manual 131 ISA Series Power Amplifiers Channel 2 Channel 1...

Page 134: ...132 QSC Audio Products LLC TD 000163 00 Rev B ITEM NO QTY PART NO DESCRIPTION VENDOR 7 15 ISA1350 Schematics...

Page 135: ...Technical Service Manual 133 ISA Series Power Amplifiers...

Page 136: ...134 QSC Audio Products LLC TD 000163 00 Rev B...

Page 137: ...Technical Service Manual 135 ISA Series Power Amplifiers...

Page 138: ...136 QSC Audio Products LLC TD 000163 00 Rev B 7 16 ISA1350 Component locations...

Page 139: ...Technical Service Manual 137 ISA Series Power Amplifiers...

Page 140: ...138 QSC Audio Products LLC TD 000163 00 Rev B...

Page 141: ......

Page 142: ...QSC and the QSC logo are registered trademarks of QSC Audio Products LLC 1665 MacArthur Blvd Costa Mesa CA 92626 800 772 2834 FAX 714 754 6173 www qscaudio com...

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