QSC ISA280 Technical & Service Manual
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QSC ISA280 Technical & Service Manual

Isa series
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ISA™ Series
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ISA280
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ISA300T
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ISA300Ti
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ISA450
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ISA500T
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ISA500Ti
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ISA750
▲ ▲ ▲ ▲ ▲
ISA800T
▲ ▲ ▲ ▲ ▲
ISA800Ti
▲ ▲ ▲ ▲ ▲
ISA1350
QSC Audio Products, LLC
Costa Mesa, CA 92626 USA
RoHS
www.qscaudio.com
*TD-000163-00*
TD-000163-00
Rev. B

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  • Page 1 ISA500Ti ▲ ▲ ▲ ▲ ▲ ISA750 ▲ ▲ ▲ ▲ ▲ ISA800T ▲ ▲ ▲ ▲ ▲ ISA800Ti ▲ ▲ ▲ ▲ ▲ ISA1350 *TD-000163-00* TD-000163-00 QSC Audio Products, LLC Rev. B Costa Mesa, CA 92626 USA RoHS www.qscaudio.com...

  • Page 3: Technical Service Manual

    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 accessory sales) Copyright 2007 and 2009 QSC Audio Products, LLC All rights reserved. Technical Service Manual ISA Series Power Amplifiers...
  • Page 4 ISA amplifier, rear view QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 5: Table Of Contents

    Table of Contents ISA Series Performance Specifications ..........................5 1. Introduction....................................7 1.1 Restriction of Hazardous Substances Directive (RoHS) .......................... 7 1.2 Service bulletins ........................................7 1.3 The well-equipped service bench ................................. 7 1.4 Working with surface-mount components ..............................8 Two-terminal components (resistors, capacitors, diodes, etc.) ..................................
  • Page 6 Chassis Assembly ISA280 (beginning June 2006) ......................................24 Chassis Assembly ISA280 (before June 2006) ......................................25 Main PCB Assembly ISA280 ............................................26 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T ................................28 6.2 ISA300T parts and assemblies ..................................30 ISA 300T Power Amplifier ............................................. 30 Chassis Assembly ISA300T ............................................

  • Page 7: Isa Series Performance Specifications

    Table of Contents continued 7. Schematics and diagrams ..............................71 7.1 ISA Series Chassis Assemblies ..................................71 7.2 ISA280 (1st generation) Schematics ................................94 7.3 ISA280 (revised) Schematics ................................... 97 7.4 ISA300T Schematics ......................................100 7.5 ISA300Ti Schematics ......................................103 7.6 ISA450 (1st generation) Schematics ................................106 7.7 ISA450 (revised) Schematics ..................................
  • Page 8 2 Ω Ω Ω Ω Ω 2 Ω Ω Ω Ω Ω 2 Ω Ω Ω Ω Ω 14.5 A 31 A* 66 A* US patents pending SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 9: Introduction

    Contact QSC Technical Services to make sure you have the most up-to-date service bulletins for ISA Series amplifiers. Service bulletins may be distributed in hard copy, via fax, and electronically (Adobe Acrobat PDF) via CD-ROMs, FTP from the QSC web site (www.qscaudio.com), and e-mail.

  • Page 10: Working With Surface-Mount Components

    Solder 4 Fully solder the other terminals of the component to their pads. Let the solder harden. 5 Fully solder the tacked terminal of the component to its pad. Figure 1.6. QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 11: Multi-Pin Components (Ics, Etc.)

    Multi-pin components (ICs, etc.) Removal Removing a multi-pin SMT component is a delicate procedure. Ideally, you should use a soldering iron with an attachment that allows you to heat all the pins simultaneously. If such a soldering device is not available, use this procedure: 1 Use a soldering iron and solder braid to remove as much solder as possible from the pins of the component.

  • Page 12: Series Description

    For example, R122 and R222 C101 have identical functions in their respective channels. 180p-5% ^C_0805 Power supplies R105 10.0K Unlike other recent QSC amplifiers, the ISA line uses strictly ^R_0805 NE5532 conventional power supplies, with large transformers that operate U101:1 R100 R102 +IN_A at the 50 or 60 Hz frequency of the AC line.

  • Page 13: Clip Detection

    octaves above the high end of the audio spectrum). This makes the strange: the positive voltage swings are handled by PNP transis- amplifier less susceptible to RF interference, high-frequency tors, while the negative swings are handled by NPN devices. The oscillations, etc.

  • Page 14: Class H

    If the voltage on BR_CUT goes positive enough to forward-bias Q8, the transistor’s collector will collapse the +15V The output sections of the ISA280, ISA300T, ISA450, and ISA500T rail. At the same time, the emitter current from Q8 will flow are AC coupled.

  • Page 15: Isa1350 Circuitry

    Compared to the utter simplicity of the lower power ISA models nominal value of 5.45 times the base voltage. A typical 25°C base like the ISA280, the ISA1350’s circuitry might seem so complex voltage is 0.68 V, resulting in a collector voltage of 4.4 V. The that it should belong to another family of power amps.

  • Page 16: Dc Fault Protection

    DataPort, etc. For amps made before the change went into effect, use service bulletin ISA0001 to correct related hang-up problems. QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 17: Component Identification And Pinout

    2. Component identification and pinout NE5532AN Dual operational amplifier LM13600 Dual operational transconductance amplifier OUTPUT A INVERTING OUTPUT B INPUT A AMP BIAS INPUT A AMP BIAS INPUT B NON-INVERTING INVERTING INPUT A INPUT B DIODE BIAS A DIODE BIAS B NON-INVERTING INPUT B NON-INVERTING...

  • Page 18: Irfz44 Tmos Power Field Effect Transistor

    IRFZ44 TMOS power field effect transistor MAC224 Triac 2N3904 (NPN) and 2N3906 (PNP) Small-signal 2SC5200 (PNP) and 2SA1943 (NPN) Power transistors transistors TOSHIBA B C E MJE15032 (NPN) and MJE15033 (PNP) Driver transistors B C E QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 19: Troubleshooting: Symptoms, Causes, & Remedies

    3. Troubleshooting: Symptoms, causes, & remedies When first checking the operation of an amplifier on the bench, Moderate increase in current draw (current increases always turn your variable transformer down to zero before slowly, doesn’t become excessive until about ¼ of the plugging the amplifier in.

  • Page 20: Faults With Signal Present

    Fan runs always on high speed only), D215, and D216 (Channel 2). • Q3 and/or U2 are shorted. • (ISA280, ISA300Ti, ISA450, and ISA500Ti) Check R118 and R119 • Check PTC thermistors R4 and R7. (Channel 1) or R218 and R219 (Channel 2).

  • Page 21: Instability

    3.4 Instability 3.5 Power supply & rail balancing problems The customer complains of gain problems, spurious noises, or oscilla- tions. Symptoms covered: Symptoms covered: • Insufficient or excessive current limiting into a shorted load • General output distortion • Op amp rails too high with a shorted load •...

  • Page 22: Table 1: Bias And Current Limit Adjustments

    0.6 A, ±10% ±10% ±10% ±10% temperature; higher when hot) * NOTE: Except ISA1350 ** Figures shown are for 120V amplifiers; multiply current by 0.5 for 230V or by 1.2 for 100V models. QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 23: Isa Calibration Procedures

    4. ISA calibration procedures resistor, adjust the trimpot to obtain the voltage listed in 4.1 Setting bias Table 1. Always set the bias Channel 2: Locate resistor R247 (except ISA1350: R199 on the • after replacing any output or driver transistor. lower module) and trimpot R231 (except ISA1350: R171 on •...
  • Page 24 AC wires and check the amp’s idle current. If the amplifier is still at about room tempera- ture, the idle current should match the value shown in Table 1. QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 25: Servicing Isa Amplifiers

    5.1 Mechanical disassembly and re-assembly Replacing components will usually require removing the channel modules and/or AC board from the amplifier chassis, especially on the ISA280, ISA300T, ISA300Ti, ISA450, ISA500T, and ISA500Ti, which have single-side printed circuit boards. The ISA750, ISA800T, ISA800Ti, and ISA1350 have double-side boards;...

  • Page 26: Replacement Parts

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 27: Chassis Assembly Isa280 (Before June 2006)

    Chassis Assembly ISA280 (beginning June 2006) continued QSC Part # Description Qty. Reference Comments SC-030004-GP M3 X 8 BLK MACHINE SC-030005-GP M3 X 12MM (BLK/ZINC) SC-030011-GP M3 X 8 MM NICKEL SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP ALT. P/N: SC-040001-GP...

  • Page 28: Main Pcb Assembly Isa280

    Chassis Assembly ISA280 (before May 2006) continued QSC Part # Description Qty. Reference Comments SC-030004-GP M3 X 8 BLK MACHINE SC-030005-GP M3 X 12MM (BLK/ZINC) SC-030011-GP M3 X 8 MM NICKEL SC-040007-GP PHILLIPS, SERRATED M4X20L BLK SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP ALT.

  • Page 29: Isa Series Power Amplifiers

    Main PCB Assembly ISA280 continued QSC Part # Description Qty. Reference Comments CA-547008-GP 4.7UF 20% 250V ELECTRO RAD CA-647006-GP CE 16NP 47UF 20% RL C106, C206 CA-710009-GP CE 25V 100UF 20% RL C105, C205 CA-722006-GP CE 25V 220UF 20% RL...

  • Page 30: Pcb Assembly, Ac/Input Isa280, 300Ti, 300T, 450, 500Ti, & 500T

    XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 This assembly is a panelized construction comprising the AC, input, and channel 2 bias adjust board assemblies, built on a common perforated circuit board.

  • Page 31: Technical Service Manual

    PCB Assembly, AC/Input ISA continued QSC Part # Description Qty. Reference Comments CO-000225-GP CONN 5-PIN WAFER P2.5 J430 CO-000314-GP CONN 26 PIN DUAL ROW W/LCK EAR HW-000020-GP FUSE HOLDER 6.3MM F100, F200 IC-000213-GP IC 4N29 MS-000125-GP HEATSINK FOR RECTIFIER BR100, BR200...

  • Page 32: Isa300T Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 33: Main Pcb Assembly Isa300T

    PWR XFMR ISA 280/300T Main PCB Assembly ISA300T QSC part # WP-000306-00 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 top), order PCB-QZ070C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ070C- PWR2.
  • Page 34 RMG 1/10W 2K 1% 0805 R8, R11, R16 RE-120007-GP RMF 5W 2K 5% AL METAL R133, R135, R233, R235 RE-122006-GP SVR 2.2K H3 7X7 R139, R140, R239, R240 RE-130004-GP RMG 1/8W 3K 1% 1206 R163, R263 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 35: Pcb Assembly, Ac/Input Isa280 300Ti, 300T, 450, 500Ti, & 500T

    CABLE ASSY, 5 PIN XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 28.

  • Page 36: Isa300Ti Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 37: Chassis Assembly Isa300Ti (Before June 2006)

    PWR XFMR ISA 280/300T XF-000268-GP LINE ISA XFMR ISA 300TI Chassis Assembly ISA300Ti (before June 2006) 120V: QSC part # WP-000325-00 230V: QSC part # WP-000325-02 220V Korea: QSC part # WP-000325-03 QSC Part # Description Qty. Reference Comments CH-000153-GP...

  • Page 38: Main Pcb Assembly Isa300Ti

    LINE ISA XFMR ISA 300TI Main PCB 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 top), order PCB-QZ070C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ070C- PWR2.

  • Page 39: Technical Service Manual

    Main PCB Assembly ISA300Ti continued QSC Part # Description Qty. Reference Comments CH-000171-GP BRACKET, RT ANGLE HD15 CH-000172-GP CLAMP TRANSISTOR CO-000205-GP HEADER 6-PIN RT ANGLE J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE J422, J423...

  • Page 40: Pcb Assembly, Ac/Input Isa280, 300Ti, 300T, 450, 500Ti, & 500T

    CABLE ASSY, 5 PIN XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

  • Page 41: Isa450 Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 42: Chassis Assembly Isa450 (Before May 2006)

    230V including UK and Korea only XF-000189-GP PWR XFMR ISA450/500T Chassis Assembly ISA450 (before May 2006) 120V: QSC part # WP-004500-00 230V: QSC part # WP-004500-02 220V Korea: QSC part # WP-004500-03 QSC Part # Description Qty. Reference Comments CH-000153-GP CHASSIS FAB ISA...

  • Page 43: Main Pcb Assembly Isa450

    PWR XFMR ISA450/500T Main PCB Assembly ISA450 QSC part # WP-004501-00 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 top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C- PWR2.
  • Page 44 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201, R203, R205, R206, R228 RE-211304-GP RMF 1/2W 11.3K 1% AT R123 RE-213304-GP RMF 1/2W 13.3K 1% AT R122, R145, R222, R245 RE-215006-GP RMF 2W 15K 5% AL METAL R2, R5 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 45: Pcb Assembly, Ac/Input Isa280, 300Ti, 300T, 450, 500Ti, & 500T

    CABLE ASSY, 5 PIN XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

  • Page 46: Isa500T Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 47: Main Pcb Assembly Isa 500T

    LINE XFMR ISA 500T Main PCB Assembly ISA 500T QSC part # WP-004501-00 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 top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C- PWR2.
  • Page 48 RMG 1/10W 2K 1% 0805 R8, R11, R16 RE-122006-GP SVR 2.2K H3 7X7 R139, R140, R239, R240 RE-130003-GP RMF 5W 3K 5% METAL R133, R135, R233, R235 RE-130004-GP RMG 1/8W 3K 1% 1206 R163, R263 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 49: Pcb Assembly, Ac/Input Isa280, 300Ti, 300T, 450, 500Ti, & 500T

    CABLE ASSY, 5 PIN XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

  • Page 50: Isa500Ti Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 51: Main Pcb Assembly Isa500Ti

    LINE ISA XFMR ISA 500TI Main PCB Assembly ISA500Ti QSC part # WP-000526-00 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 top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C- PWR2.
  • Page 52 RMG 1/10W 976 OHM 1% 0805 RE-110011-GP RMF 5W 1K 5% R32, R157, R158, R257, R258 RE-110012-GP RMG 1/10W 1K 5% 0805 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 R19, R114A, R214A QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 53: Pcb Assembly, Ac/Input Isa280, 300Ti, 300T, 450, 500Ti, & 500T

    CABLE ASSY, 5 PIN XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T 120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

  • Page 54: Isa750 Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 55: Chassis Assembly Isa750 (Before May 2006)

    PCB ASSY, AC/INPUT, ISA750, 230V, XF-000192-GP PWR XFMR ISA800T/750 Chassis Assembly ISA750 (before May 2006) 120V: QSC part # WP-007500-00 230V: QSC part # WP-007500-02 220V Korea: QSC part # WP-007500-03 QSC Part # Description Qty. Reference Comments CH-000153-GP CHASSIS FAB ISA...

  • Page 56: Main Pcb Assembly Isa750

    PWR XFMR ISA800T/750 Main PCB Assembly ISA750 QSC part # WP-007501-00 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 underneath, order PCB-QZ060C-PWR1; for the channel 2 module (the one on top), order PCB-QZ060C- PWR2.

  • Page 57: Technical Service Manual

    Main PCB Assembly ISA750 continued QSC Part # Description Qty. Reference Comments CO-000222-GP 8-PIN IC SOCKET U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC J1, J203 CO-000224-GP CONN 6 PIN ST. WAFER J421 CO-000226-GP CONN 13-PIN WAFER 2.0 J104, J204 HW-000020-GP FUSE HOLDER 6.3MM...

  • Page 58: Pcb Assembly, Ac/Input Isa750, 800Ti, & 800T

    L100, L200 PCB Assembly, AC/Input ISA750, 800Ti, & 800T 120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 This assembly is a panelized construction comprising the AC, input, and channel 2 bias adjust board assemblies, built on a common perforated circuit board.

  • Page 59: Technical Service Manual

    PCB Assembly, AC/Input ISA750, 800, 800Ti continued QSC Part # Description Qty. Reference Comments CO-000314-GP CONN 26 PIN DUAL ROW W/LCK EAR IC-000213-GP IC 4N29 LB-000360-GP LABEL, BLANK, 30 X 7MM WIRE MS-000126-GP HEATSINK, BRIDGE RECTIFIER REF: Q3 NW-030001-GP WASHER M3.0 X 0.4 X 8 BZ NW-032000-GP WASHER NYLON ID 3.2MM...

  • Page 60: Isa800T Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 61: Main Pcb Assembly Isa800T

    WP-007502-02 PCB ASSY, AC/INPUT, ISA750, 230V, 230V only XF-000192-GP PWR XFMR ISA800T/750 XF-000226-GP LINE XFMR ISA 800T Main PCB Assembly ISA800T QSC part # WP-000806-00 QSC Part # Description Qty. Reference Comments CA-027003-GP CTC 200V 27PF 5% 1206 C111, C211...
  • Page 62 RE-010006-GP RMG 1/10W 100 5% R109, R110, R209, R210 RE-010007-GP RMG 1/8W 100 OHM 5% 1206 R30, R197 RE-010008-GP RMF 1/4W 100 OHM 5% R164, R264 RE-010009-GP 100 OHM POT PCB MOUNT R231 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 63: Pcb Assembly, Ac/Input Isa750, 800Ti, & 800T

    XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA750, 800Ti, & 800T 120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 See parts listing on pages 56 and 57. Technical Service Manual ISA Series Power Amplifiers...

  • Page 64: Isa800Ti Parts And Assemblies

    EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PL-000164-GP AC CORD PROTECTOR PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 65: Main Pcb Assembly Isa800Ti

    PCB ASSY, AC/INPUT, ISA750, 230V, 230V only XF-000192-GP PWR XFMR ISA800T/750 XF-000270-GP LINE ISA XFMR ISA 800TI Main PCB Assembly ISA800Ti QSC part # WP-004501-00 QSC Part # Description Qty. Reference Comments CA-027003-GP CTC 200V 27PF 5% 1206 C111, C211...
  • Page 66 RMF 1/4W 10 OHM 5% R163, R263 RE-001201-GP 12 5% 5W METAL OXIDE FILM R154, R155, R161, R162, R254, R255, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP R136, R137, R236, R237 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 67: Pcb Assembly, Ac/Input Isa750, 800Ti, & 800T

    XF-000190-GP SPRING COIL 2UH (14GA WIRE) L100, L200 PCB Assembly, AC/Input ISA750, 800Ti, & 800T 120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 See parts listing on pages 57 and 58. Technical Service Manual ISA Series Power Amplifiers...

  • Page 68: Isa1350 Parts And Assemblies

    TOP COVER ISA1350 CO-000228-GP EURO 3 PIN CONNECTOR, GRN LB-000438-GP LABEL, WARNING, RAIN & MOISTURE PL-000156-GP RUBBER FEET PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM...

  • Page 69: Technical Service Manual

    Main PCB Assembly ISA1350 continued QSC Part # Description Qty. Reference Comments CA-215004-GP CM 250V .0015UF 5% RL C114 CA-222007-GP 50V .0022UF 10% 1206 C122, C125, C126, C164, C165, C170 CA-222012-GP 0.0022UF, 5 PCNT, 250V, RADIAL, , C121 CA-233006-GP 0.0033UF 5% 50V CER X7R 0805 C102 All 220–240V only...
  • Page 70 PL-000253-GP SLEEVE, RIBBON, 50X120X.4MM, BLK PL-000327-GP PAD, XFMR, EPDM 40A, 1/8" THK, BLACK, PL-000328-GP INSULATOR, TO-220, 4-POS, , , PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) PM-000043-GP CARTON, INSERT PM-000048-GP POLYBAG MANUAL PM-000049-GP BAG, PLASTIC, 4" X 6" PM-000050-GP...

  • Page 71: Technical Service Manual

    Main PCB Assembly ISA1350 continued QSC Part # Description Qty. Reference Comments RE-.39001-GP 3.9 5% 5W METAL FILM R243–R246, R266, R268 RE-.47002-GP 4.7 1% 1/8W METAL FILM 1206 R197, R202 RE-.56006-GP RMF 2W 5.6 OHM 5% R254 RE-000005-GP POLYSWITCH 1.1A 0.15 OHM 1.5W R9–R12...
  • Page 72 WIRE ASSY W/2T L-220 #14 BRN WC-000335-GP WIRE ASSY W/2T L-520 #14 GRY WC-000336-GP CABLE ASSY RIBBON 24PIN IEC WC-000337-GP CONN ASSY 3P P2.5 L-160 26AWG XF-000190-GP SPRING COIL 2UH (14GA WIRE) L101 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 73: Schematics And Diagrams

    Chassis assembly, ISA280 7. Schematics and diagrams 7.1 ISA Series Chassis Assemblies Technical Service Manual ISA Series Power Amplifiers...
  • Page 74 Chassis assembly, ISA280 & ISA300T QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 75: Technical Service Manual

    Chassis assembly, ISA300T M4 X 20MM Technical Service Manual ISA Series Power Amplifiers...
  • Page 76 Chassis assembly, ISA300Ti QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 77: Technical Service Manual

    Chassis assembly, ISA300Ti Technical Service Manual ISA Series Power Amplifiers...
  • Page 78 Chassis assembly, ISA450 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 79: Technical Service Manual

    Chassis assembly, ISA450 Technical Service Manual ISA Series Power Amplifiers...
  • Page 80 Chassis assembly, ISA500T M4 X 20MM QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 81: Technical Service Manual

    Chassis assembly, ISA500T & ISA500Ti Technical Service Manual ISA Series Power Amplifiers...
  • Page 82 Chassis assembly, ISA500Ti M4 X 20MM QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 83: Technical Service Manual

    Chassis assembly, ISA750 Technical Service Manual ISA Series Power Amplifiers...
  • Page 84 Chassis assembly, ISA750 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 85: Technical Service Manual

    Chassis assembly, ISA800T M4 X 20MM Technical Service Manual ISA Series Power Amplifiers...
  • Page 86 Chassis assembly, ISA800T QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 87: Isa 800Ti

    Chassis assembly, ISA800Ti Technical Service Manual ISA Series Power Amplifiers...

  • Page 88: Isa 800Ti

    Chassis assembly, ISA800Ti QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 89: Technical Service Manual

    Chassis assembly, ISA1350 Technical Service Manual ISA Series Power Amplifiers...
  • Page 90 Chassis assembly, ISA1350 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 91: Technical Service Manual

    Chassis assembly, ISA1350 Technical Service Manual ISA Series Power Amplifiers...
  • Page 92 Chassis assembly, ISA1350 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 93: Technical Service Manual

    Technical Service Manual ISA Series Power Amplifiers...
  • Page 94 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 95: Technical Service Manual

    Technical Service Manual ISA Series Power Amplifiers...

  • Page 96: Isa280 (1St Generation) Schematics

    7.2 ISA280 (1st generation) Schematics ISA 280 Gray shading indicates signal path Early version page 1 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 97: Technical Service Manual

    ISA 280 Gray shading indicates Early version signal path page 2 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 98 ISA 280 Early version page 3 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 99: Isa280 (Revised) Schematics

    7.3 ISA280 (revised) Schematics ISA 280 Gray shading indicates signal path Revised version (March 2003) page 1 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 100 ISA 280 Gray shading indicates Revised version (March 2003) signal path page 2 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 101: Technical Service Manual

    ISA 280 Revised version (March 2003) page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 102: Isa300T Schematics

    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 QSC AUDIO PRODUCTS. 7.4 ISA300T Schematics PC–004508–00, INPUT PCB ISA 300T Gray shading indicates...

  • Page 103: Technical Service Manual

    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 QSC AUDIO PRODUCTS. PC-004509-00, PC-004504-00, DISPLAY PCB TRIMPOT PCB PC-004503-00, DATA PORT PCB PC-004505-00,...
  • Page 104 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 QSC AUDIO PRODUCTS. MUTING AND THERMAL PROTECTION U-I CORE POWER TRANSFORMER PC–004507–00, AC PCB NOTE: SPLIT SECONDARY WIRING FROM EACH LEG TO EACH CHANNEL.

  • Page 105: Isa300Ti Schematics

    7.5 ISA300Ti Schematics ISA 300Ti Gray shading indicates signal path page 1 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 106 ISA 300Ti page 3 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 107: Technical Service Manual

    ISA 300Ti page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 108: Isa450 (1St Generation) Schematics

    7.6 ISA450 (1st generation) Schematics ISA 450 Gray shading indicates signal path Early version page 1 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 109: Technical Service Manual

    ISA 450 Early version page 2 of 3 Gray shading indicates signal path Technical Service Manual ISA Series Power Amplifiers...
  • Page 110 ISA 450 Early version page 3 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 111: Isa450 (Revised) Schematics

    7.7 ISA450 (revised) Schematics ISA 450 Revised version (March 2003) Gray shading indicates page 1 of 3 signal path Technical Service Manual ISA Series Power Amplifiers...
  • Page 112 ISA 450 Revised version (March 2003) page 2 of 3 Gray shading indicates signal path QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 113: Technical Service Manual

    ISA 450 Revised version (March 2003) page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 114: Isa500T Schematics

    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 QSC AUDIO PRODUCTS. 7.8 ISA500T Schematics PC–004508–00, INPUT PCB J400:1 –IN A CHANNEL 1 J400:2 TO J421.

  • Page 115: Technical Service Manual

    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 QSC AUDIO PRODUCTS. SERIES REGULATOR SUPPLIES APPROX 40MA TO HD-15 PORT PC–004504–00, DISPLAY PCB...
  • Page 116 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 QSC AUDIO PRODUCTS. MUTING AND THERMAL PROTECTION PC–004507–00, AC PCB U-I CORE POWER TRANSFORMER...

  • Page 117: Isa500Ti Schematics

    7.9 ISA500Ti Schematics ISA 500Ti Gray shading indicates signal path page 1 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 118 ISA 500Ti page 2 of 3 Gray shading indicates signal path QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 119: Technical Service Manual

    ISA 500Ti page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 120: Isa750 (1St Generation) Schematics

    7.10 ISA750 (1st generation) Schematics Gray shading indicates signal path ISA 750 Early version page 1 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 121: Technical Service Manual

    ISA 750 Early version Gray shading indicates page 2 of 3 signal path Technical Service Manual ISA Series Power Amplifiers...
  • Page 122 ISA 750 Early version page 3 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 123: Isa750 (Revised) Schematics

    7.11 ISA750 (revised) Schematics Gray shading indicates signal path ISA 750 Revised version (March 2003) page 1 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 124 ISA 750 Revised version (March 2003) Gray shading indicates signal path page 2 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 125: Technical Service Manual

    ISA 750 Revised version (March 2003) page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 126: Isa800T Schematics

    POS STEP DRIVER 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 QSC AUDIO PRODUCTS. 7.12 ISA800T Schematics DC FAULT PROTECTION CHANNEL 1 R163 PC–007508–00, INPUT PCB...

  • Page 127: Technical Service Manual

    THIS DOCUMENT CONTAINS PROPRIETARY CONNECTS TO LOWER INFORMATION THAT IS THE PROPERTY PC–007505–00, OF QSC AUDIO PRODUCTS, WHICH MAY NOT POWER LED PCB POS. RAIL ON SAME BE DISCLOSED, REPRODUCED OR USED SIDE AS DISPLAY LEDs J425:2 J207:2 WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS.
  • Page 128 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 QSC AUDIO PRODUCTS. MUTING AND THERMAL PROTECTION PC–007507–00, AC PCB U-I CORE POWER TRANSFORMER...

  • Page 129: Isa800Ti Schematics

    7.13 ISA800Ti Schematics Gray shading indicates signal path ISA800Ti page 1 of 3 Technical Service Manual ISA Series Power Amplifiers...
  • Page 130 ISA800Ti Gray shading indicates signal path page 2 of 3 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 131: Technical Service Manual

    ISA800Ti page 3 of 3 Technical Service Manual ISA Series Power Amplifiers...

  • Page 132: Isa750, Isa800T, Isa800Ti Component Locations

    7.14 ISA750, ISA800T, ISA800Ti Component locations Channel 2 Channel 1 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 133: Technical Service Manual

    Channel 2 Channel 1 Technical Service Manual ISA Series Power Amplifiers...

  • Page 134: Isa1350 Schematics

    7.15 ISA1350 Schematics ITEM NO. PART NO. DESCRIPTION VENDOR QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 135: Technical Service Manual

    Technical Service Manual ISA Series Power Amplifiers...
  • Page 136 QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 137: Technical Service Manual

    Technical Service Manual ISA Series Power Amplifiers...

  • Page 138: Isa1350 Component Locations

    7.16 ISA1350 Component locations QSC Audio Products, LLC TD-000163-00 Rev. B...

  • Page 139: Technical Service Manual

    Technical Service Manual ISA Series Power Amplifiers...
  • Page 140 QSC Audio Products, LLC TD-000163-00 Rev. B...
  • 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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