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QSC ISA 1350 Technical & Service Manual - 1.8  Revisions Made During

Other manuals for ISA 1350: User Manual, Specifications, User Manual, User Manual

Summary of ISA 1350

  • Page 1

    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 us...

  • Page 3: Isa280

    Technical service manual 1 isa series power amplifiers qsc audio products, llc technical services group phone: 1-800 qsc audio (1-800-772-2834) usa only +1 (714) 957-7150 fax: +1 (714) 754-6173 skype id: qscaudio postal: 1665 macarthur blvd. Costa mesa, california 92626 usa e-mail: tech_support@qsca...

  • Page 4

    2 qsc audio products, llc td-000163-00 rev. B isa amplifier, rear view.

  • Page 5: Table of Contents

    Technical service manual 3 isa series power amplifiers table of contents isa series performance specifications ................................................................................................................................ 5 1. Introduction .............................................

  • Page 6

    4 qsc audio products, llc td-000163-00 rev. B tools and resources you will need ................................................................................................................................................................................................................. 21 procedu...

  • Page 7

    Technical service manual 5 isa series power amplifiers isa series performance specifications isa280 & isa300ti isa450 & isa500ti isa750 & isa800ti isa1350 output power in watts ftc: 20 hz–20 khz @ 0.1% thd, both channels driven, direct outputs 8w per channel 185 260 450 800 4w per channel 280 400 65...

  • Page 8

    6 qsc audio products, llc td-000163-00 rev. B l a c i p y t 1 l l u f 2 x a m 3 e l d i a 5 . 0 8 Ω Ω Ω Ω Ω a 3 a 1 . 4 a 4 . 7 4 Ω Ω Ω Ω Ω a 5 . 4 a 6 . 6 a 5 . 1 1 2 Ω Ω Ω Ω Ω a 5 . 6 * a 5 . 9 * a 7 1 l a c i p y t 1 l l u f 2 x a m 3 e l d i a 5 . 0 8 Ω Ω Ω Ω Ω a 7 . 3 a 4 . 5 a 0 1 4 Ω Ω Ω Ω Ω ...

  • Page 9: 1. Introduction

    Technical service manual 7 isa series power amplifiers 1. Introduction 1.2 service bulletins 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 acr...

  • Page 10

    8 qsc audio products, llc td-000163-00 rev. B solder braid solder solder tweezers solder 1.4 working with surface-mount components isa amplifiers, like many modern electronic products, use surface-mount technology (smt) components where appropriate in order to make high-density circuitry that is rel...

  • Page 11

    Technical service manual 9 isa series power amplifiers 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 n...

  • Page 12: 1.5 Series Description

    10 qsc audio products, llc td-000163-00 rev. B 1.5 series description qsc’s isa series amplifiers are entry-level professional audio products for installed sound systems, designed for good, basic performance and reliability at low price. The series comprises seven current models—the isa280, isa300ti...

  • Page 13

    Technical service manual 11 isa series power amplifiers octaves above the high end of the audio spectrum). This makes the amplifier less susceptible to rf interference, high-frequency oscillations, etc. Also in this stage, the feedback loop contains one half of a 13600 dual operational transconducta...

  • Page 14

    12 qsc audio products, llc td-000163-00 rev. B voltage. The triggered scr will in turn trigger triac q113, shorting the output to ground through fuse f100. The fuse will blow, safeguarding the speaker load from the dc fault. The output sections of the isa280, isa300t, isa450, and isa500t are ac coup...

  • Page 15: 1.7 Isa1350 Circuitry

    Technical service manual 13 isa series power amplifiers from amplifier output circuitry 25v 70v 100v 8, 4, or 2 1.7 isa1350 circuitry compared to the utter simplicity of the lower power isa models like the isa280, the isa1350’s circuitry might seem so complex that it should belong to another family ...

  • Page 16: 1.8  Revisions Made During

    14 qsc audio products, llc td-000163-00 rev. B 1.8 revisions made during production isa750 and isa800t april 2002—zener diodes d107, d110, d207, and d210 changed from 5.6v to 4.7v. This is to eliminate the tendency of either channel to hang up when the amplifier is turned on. Channel 1 was most susc...

  • Page 17

    Technical service manual 15 isa series power amplifiers 2. Component identification and pinout 1 2 3 4 8 7 6 5 a b output a inverting input a non-inverting input a v- output b inverting input b non-inverting input b v+ 1 2 3 4 8 7 6 5 ground 1 non-inverting input inverting input v- output balance/ s...

  • Page 18

    16 qsc audio products, llc td-000163-00 rev. B b c e 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 2sa1943 (npn) power transistors mac224 tr...

  • Page 19: 3. Troubleshooting:

    Technical service manual 17 isa series power amplifiers when first checking the operation of an amplifier on the bench, always turn your variable transformer down to zero before plugging the amplifier in. After you turn the amplifier on, gradually turn up the ac voltage as you observe the amplifier’...

  • Page 20

    18 qsc audio products, llc td-000163-00 rev. B too much or too little muting delay • excessive delay at turn-on: check for open ld1, r2, or r5; check for incorrect r10 or r15; check for shorted d9; also see service bulletin rmx0002. • too short at turn-on (amplifier unmutes before the circuits stabi...

  • Page 21: 3.4 Instability

    Technical service manual 19 isa series power amplifiers 3.4 instability the customer complains of gain problems, spurious noises, or oscilla- tions. Symptoms covered: • general output distortion • “ringing” sound in loudspeaker trailing an audio signal • excessive crossover distortion • the output w...

  • Page 22

    20 qsc audio products, llc td-000163-00 rev. B current limits properly into short, but current is weak at 2 Ω Ω Ω Ω Ω • if the op amp rails are low ( ohm load without clipping, check the resistors r157 and r158 (channel 1, all models), r198 (channel 1, isa750 and isa800t only) and diodes d115 and d1...

  • Page 23: Current Limits

    Technical service manual 21 isa series power amplifiers 4. Isa calibration procedures resistor, adjust the trimpot to obtain the voltage listed in table 1. 4. Channel 2: locate resistor r247 (except isa1350: r199 on the lower module) and trimpot r231 (except isa1350: r171 on the lower module). While...

  • Page 24

    22 qsc audio products, llc td-000163-00 rev. B back up until the output clips. The voltage at which the signal starts to clip should fall within the range shown in table 1. If the clipping is asymmetrical, that is, the signal clips on either the positive or negative side first, adjust r139 to make i...

  • Page 25: 5. Servicing Isa Amplifiers

    Technical service manual 23 isa series power amplifiers 5. 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, isa50...

  • Page 26: 6. Replacement Parts

    24 qsc audio products, llc td-000163-00 rev. B 6. Replacement parts 6.1 isa280 parts and assemblies isa280 power amplifier 120v: qsc part # fg-002800-00 230v: qsc part # fg-002800-02 220v korea: qsc part # fg-002800-03 240v uk: qsc part # fg-002800-04 qsc part # description qty. Reference comments c...

  • Page 27

    Technical service manual 25 isa series power amplifiers sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 8 sc-030011-gp m3 x 8 mm nickel 2 sc-040008-gp p/p, m4, 10mm, blk, triangular tip 10 alt. P/n: sc-040001-gp sw-000086-gp circuit brkr 10amp 1 100v and 120v only sw-000088-gp r...

  • Page 28

    26 qsc audio products, llc td-000163-00 rev. B sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 4 sc-030011-gp m3 x 8 mm nickel 2 sc-040007-gp phillips, serrated m4x20l blk 4 sc-040008-gp p/p, m4, 10mm, blk, triangular tip 10 alt. P/n: sc-040001-gp sw-000086-gp circuit brkr 10amp...

  • Page 29

    Technical service manual 27 isa series power amplifiers ca-547008-gp 4.7uf 20% 250v electro rad 1 c7 ca-647006-gp ce 16np 47uf 20% rl 2 c106, c206 ca-710009-gp ce 25v 100uf 20% rl 2 c105, c205 ca-722006-gp ce 25v 220uf 20% rl 5 c13, c112, c113, c212, c213 ca-847001-gp ce 80v 4700uf 20% rl 25x 4 c120...

  • Page 30

    28 qsc audio products, llc td-000163-00 rev. B re-010006-gp rmg 1/10w 100 5% 3 r109, r110, r209 re-010009-gp 100 ohm pot pcb mount 1 r131 re-027003-gp rmg 1/10w 270 ohm 5% 4 r111, r113, r210, r213 re-027004-gp rmg 1/10w 270 ohm 1% 0805 2 r120, r220 re-082003-gp rmg 1/8w 820 ohm 5% 1206 6 r115, r130,...

  • Page 31

    Technical service manual 29 isa series power amplifiers co-000225-gp conn 5-pin wafer p2.5 1 j430 co-000314-gp conn 26 pin dual row w/lck ear 1 hw-000020-gp fuse holder 6.3mm 2 f100, f200 ic-000213-gp ic 4n29 1 u2 ms-000125-gp heatsink for rectifier 2 br100, br200 ms-000126-gp heatsink, bridge recti...

  • Page 32

    30 qsc audio products, llc td-000163-00 rev. B 6.2 isa300t parts and assemblies isa 300t power amplifier 120v: qsc part # fg-000305-00 230v: qsc part # fg-000305-02 220v korea: qsc part # fg-000305-03 240v uk: qsc part # fg-000305-04 qsc part # description qty. Reference comments ch-000155-gp top co...

  • Page 33

    Technical service manual 31 isa series power amplifiers sw-000088-gp rocker power switch 1 sw-000093-gp circuit breaker, 5 amp, , 1 230v only wc-000169-gp conn assy 2pin isa 2 wc-000171-gp conn assy 3-pin 1 wc-000173-gp conn assy 4p p2.5 l=200 awg26 2 wc-000174-gp conn assy 6-pin isa 280 1 wc-000175...

  • Page 34

    32 qsc audio products, llc td-000163-00 rev. B co-000216-gp conn 8 pin straight wafer 2 j297, j424 co-000217-gp conn 13 pin straight wafer 2 j104, j204 co-000219-gp 3 pin input jack 2 j102, j202 co-000220-gp conn hd15 1 j50 co-000221-gp z-tab isa 10 e9–e12, e100, e101, e112, e200, e201, e212 co-0002...

  • Page 35

    Technical service manual 33 isa series power amplifiers re-133007-gp rmg 1/10w 3.3k 5% 0805 3 r24, r164, r264 re-175003-gp rmg 1/10w 7.5k 5% 0805 2 r108, r208 re-190903-gp rmf 1/2w 9.09k 1% at 1 r123 re-210007-gp 10k 1% 1/10w thk flm 0805 17 r28–r31, r53, r100, r101, r103, r105, r106, r128, r200, r2...

  • Page 36

    34 qsc audio products, llc td-000163-00 rev. B 6.3 isa300ti parts and assemblies isa300ti power amplifier 120v: qsc part # fg-000325-00 230v: qsc part # fg-000325-02 220v korea: qsc part # fg-000325-03 240v uk: qsc part # fg-000325-04 qsc part # description qty. Reference comments ch-000155-gp top c...

  • Page 37

    Technical service manual 35 isa series power amplifiers sc-000021-gp bolt, m6 x 55mm, , , wht zinc, 2 sc-030001-gp bh m3 x 10mm bz crd, b-tite 4 sc-030002-gp m3 b-tite flat-cs 2 sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 4 sc-030011-gp m3 x 8 mm nickel 2 sc-040007-gp philli...

  • Page 38

    36 qsc audio products, llc td-000163-00 rev. B sc-000019-gp bolt, m8 x 80mm, , , wht zinc, 1 sc-000021-gp bolt, m6 x 55mm, , , wht zinc, 2 sc-030001-gp bh m3 x 10mm bz crd, b-tite 4 sc-030002-gp m3 b-tite flat-cs 2 sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 4 sc-030011-gp m...

  • Page 39

    Technical service manual 37 isa series power amplifiers ch-000171-gp bracket, rt angle hd15 1 ch-000172-gp clamp transistor 1 co-000205-gp header 6-pin rt angle 1 j421 co-000209-gp header 3-pin right angle 2 j401, j402 co-000210-gp header 4-pin right angle 2 j422, j423 co-000213-gp conn 2 pin straig...

  • Page 40

    38 qsc audio products, llc td-000163-00 rev. B re-110011-gp rmf 5w 1k 5% 1 r32 re-110012-gp rmg 1/10w 1k 5% 0805 3 r102, r126, r202 re-112001-gp rmg 1/10w 1.2k 1% 0805 3 r19, r114a, r214a re-115004-gp rmg 1/10w 1.5k 5% 0805 2 r129, r229 re-120004-gp rmg 1/10w 2k 1% 0805 3 r8, r11, r16 re-120007-gp r...

  • Page 41

    Technical service manual 39 isa series power amplifiers 6.4 isa450 parts and assemblies isa450 power amplifier 120v: qsc part # fg-004500-00 230v: qsc part # fg-004500-02 220v korea: qsc part # fg-004500-03 240v uk: qsc part # fg-004500-04 qsc part # description qty. Reference comments ch-000155-gp ...

  • Page 42

    40 qsc audio products, llc td-000163-00 rev. B sc-040008-gp p/p, m4, 10mm, blk, triangular tip 10 alt. P/n: sc-040001-gp sw-000088-gp rocker power switch 1 sw-000091-gp circuit breaker 15a 1 100v and 120v only sw-000094-gp circuit breaker 8a 1 230v including uk and korea only wc-000169-gp conn assy ...

  • Page 43

    Technical service manual 41 isa series power amplifiers wc-000177-gp ul1015 #14 2p grn l=100 1 wc-000179-gp ul1015 #16 3p brn l=360 2 wc-000180-gp ul1015 #16 2p offwhite 2 wc-000182-gp conn assy 13p p2.0 l=240 1 wc-000192-gp ul 2547 3-pin p2.5 l=250 2 wc-000198-gp ground wire 1 wc-000199-gp ul 1015 ...

  • Page 44

    42 qsc audio products, llc td-000163-00 rev. B co-000223-gp 26-pin dual row iec 2 j1, j203 ic-000211-gp ic ne5532 op amp 2 u101, u201 ic-000212-gp ic ne5517d 1 u10 pc-004501-00 srv - main pcb, isa 3 space 1 pl-000150-gp led holder 3 ref: ld1a, ld100a, ld200a pl-000154-gp insulation sheet ic isa 5 pl...

  • Page 45

    Technical service manual 43 isa series power amplifiers re-220005-gp rmg 1/10w 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-247004-gp rm...

  • Page 46

    44 qsc audio products, llc td-000163-00 rev. B 6.5 isa500t parts and assemblies isa 500t power amplifier 120v: qsc part # fg-000505-00 230v: qsc part # fg-000505-02 220v korea: qsc part # fg-000505-03 240v uk: qsc part # fg-000505-04 qsc part # description qty. Reference comments ch-000155-gp top co...

  • Page 47

    Technical service manual 45 isa series power amplifiers sw-000091-gp circuit breaker 15a 1 100v and 120v only sw-000094-gp circuit breaker 8a 1 230v only wc-000169-gp conn assy 2pin isa 2 wc-000171-gp conn assy 3-pin 1 wc-000173-gp conn assy 4p p2.5 l=200 awg26 2 wc-000174-gp conn assy 6-pin isa 280...

  • Page 48

    46 qsc audio products, llc td-000163-00 rev. B co-000216-gp conn 8 pin straight wafer 2 j297, j424 co-000217-gp conn 13 pin straight wafer 2 j104, j204 co-000219-gp 3 pin input jack 2 j102, j202 co-000220-gp conn hd15 1 j50 co-000221-gp z-tab isa 14 e9–e12, e100, e101, e112, e200, e201, e212, e226–e...

  • Page 49

    Technical service manual 47 isa series power amplifiers re-133007-gp rmg 1/10w 3.3k 5% 0805 3 r24, r164, r264 re-175003-gp rmg 1/10w 7.5k 5% 0805 2 r108, r208 re-210007-gp 10k 1% 1/10w thk flm 0805 17 r28–r31, r53, r100, r101, r103, r105, r106, r128, r200, r201, r203, r205, r206, r228 re-211304-gp r...

  • Page 50

    48 qsc audio products, llc td-000163-00 rev. B 6.6 isa500ti parts and assemblies isa500ti power amplifier 120v: qsc part # fg-000525-00 230v: qsc part # fg-000525-02 220v korea: qsc part # fg-000525-03 240v uk: qsc part # fg-000525-04 qsc part # description qty. Reference comments ch-000155-gp top c...

  • Page 51

    Technical service manual 49 isa series power amplifiers sc-030001-gp bh m3 x 10mm bz crd, b-tite 4 sc-030002-gp m3 b-tite flat-cs 2 sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 8 sc-030011-gp m3 x 8 mm nickel 2 sc-040008-gp p/p, m4, 10mm, blk, triangular tip 10 alt. P/n: sc-0...

  • Page 52

    50 qsc audio products, llc td-000163-00 rev. B co-000205-gp header 6-pin rt angle 1 j421 co-000209-gp header 3-pin right angle 2 j401, j402 co-000210-gp header 4-pin right angle 2 j422, j423 co-000213-gp conn 2 pin straight wafer 2 j337, j425 co-000214-gp conn 3 pin straight wafer 3 j157, j309, j310...

  • Page 53

    Technical service manual 51 isa series power amplifiers re-115004-gp rmg 1/10w 1.5k 5% 0805 2 r129, r229 re-120004-gp rmg 1/10w 2k 1% 0805 3 r8, r11, r16 re-122006-gp svr 2.2k h3 7x7 4 r139, r140, r239, r240 re-130003-gp rmf 5w 3k 5% metal 4 r133, r135, r233, r235 re-130004-gp rmg 1/8w 3k 1% 1206 2 ...

  • Page 54

    52 qsc audio products, llc td-000163-00 rev. B 6.7 isa750 parts and assemblies isa750 power amplifier 120v: qsc part # fg-007500-00 230v: qsc part # fg-007500-02 220v korea: qsc part # fg-007500-03 240v uk: qsc part # fg-007500-04 qsc part # description qty. Reference comments ch-000155-gp top cover...

  • Page 55

    Technical service manual 53 isa series power amplifiers sw-000088-gp rocker power switch 1 sw-000091-gp circuit breaker 15a 1 wc-000169-gp conn assy 2pin isa 2 wc-000171-gp conn assy 3-pin 1 wc-000173-gp conn assy 4p p2.5 l=200 awg26 2 wc-000174-gp conn assy 6-pin isa 280 1 wc-000175-gp conn assy 8p...

  • Page 56

    54 qsc audio products, llc td-000163-00 rev. B wc-000180-gp ul1015 #16 2p offwhite 2 wc-000182-gp conn assy 13p p2.0 l=240 1 wc-000192-gp ul 2547 3-pin p2.5 l=250 2 wc-000197-gp conn assy 4-pin p=2.5 l=100 1 wc-000198-gp ground wire 1 wc-000199-gp ul 1015 awg#14 brown 1 wc-000211-gp wire assy, fan g...

  • Page 57

    Technical service manual 55 isa series power amplifiers co-000222-gp 8-pin ic socket 2 u101, u201 co-000223-gp 26-pin dual row iec 2 j1, j203 co-000224-gp conn 6 pin st. Wafer 1 j421 co-000226-gp conn 13-pin wafer 2.0 2 j104, j204 hw-000020-gp fuse holder 6.3mm 4 f100, f200 ic-000211-gp ic ne5532 op...

  • Page 58

    56 qsc audio products, llc td-000163-00 rev. B re-082004-gp rmg 1/10w 820 ohm 5% 1206 1 r211 re-110011-gp rmf 5w 1k 5% 1 r32 re-110012-gp rmg 1/10w 1k 5% 0805 3 r102, r126, r202 re-112001-gp rmg 1/10w 1.2k 1% 0805 4 r18, r19, r114a, r214a re-115004-gp rmg 1/10w 1.5k 5% 0805 2 r129, r229 re-120003-gp...

  • Page 59

    Technical service manual 57 isa series power amplifiers co-000314-gp conn 26 pin dual row w/lck ear 1 ic-000213-gp ic 4n29 1 u2 lb-000360-gp label, blank, 30 x 7mm 10 wire ms-000126-gp heatsink, bridge rectifier 1 ref: q3 nw-030001-gp washer m3.0 x 0.4 x 8 bz 5 nw-032000-gp washer nylon id 3.2mm 4 p...

  • Page 60

    58 qsc audio products, llc td-000163-00 rev. B 6.8 isa800t parts and assemblies isa800t power amplifier 120v: qsc part # fg-000805-00 230v: qsc part # fg-000805-02 220v korea: qsc part # fg-000805-03 240v uk: qsc part # fg-000805-04 qsc part # description qty. Reference comments ch-000155-gp top cov...

  • Page 61

    Technical service manual 59 isa series power amplifiers sw-000094-gp circuit breaker 8a 1 230v only wc-000169-gp conn assy 2pin isa 2 wc-000171-gp conn assy 3-pin 1 wc-000173-gp conn assy 4p p2.5 l=200 awg26 2 wc-000174-gp conn assy 6-pin isa 280 1 wc-000175-gp conn assy 8p p2.5 l=460 awg26 1 wc-000...

  • Page 62

    60 qsc audio products, llc td-000163-00 rev. B co-000216-gp conn 8 pin straight wafer 2 j258, j424 co-000219-gp 3 pin input jack 2 j102, j202 co-000220-gp conn hd15 1 j50 co-000221-gp z-tab isa 18 e100, e100a, e101, e112–e117, e117a, e200, e201, e212–e217 co-000222-gp 8-pin ic socket 2 u101, u201 co...

  • Page 63

    Technical service manual 61 isa series power amplifiers re-012003-gp rmf 3w 120 ohm 5% al metal 1 r17 re-027004-gp rmg 1/10w 270 ohm 1% 0805 2 r196, r296 re-027402-gp rmg 274 ohm 1/10w 5% 2 r113, r213 re-039001-gp rmg 1/10w 390 ohm 5% 0805 2 r120, r220 re-082003-gp rmg 1/8w 820 ohm 5% 1206 9 r111, r...

  • Page 64

    62 qsc audio products, llc td-000163-00 rev. B 6.9 isa800ti parts and assemblies isa800ti power amplifier 120v: qsc part # fg-000825-00 230v: qsc part # fg-000825-02 220v korea: qsc part # fg-000825-03 240v uk: qsc part # fg-000825-04 qsc part # description qty. Reference comments ch-000155-gp top c...

  • Page 65

    Technical service manual 63 isa series power amplifiers sc-030002-gp m3 b-tite flat-cs 2 sc-030004-gp m3 x 8 blk machine 16 sc-030005-gp m3 x 12mm (blk/zinc) 4 sc-030011-gp m3 x 8 mm nickel 2 sc-040007-gp phillips, serrated m4x20l blk 4 sc-040008-gp p/p, m4, 10mm, blk, triangular tip 10 alt. P/n: sc...

  • Page 66

    64 qsc audio products, llc td-000163-00 rev. B ch-000168-gp vr bracket isa 2 ch-000171-gp bracket, rt angle hd15 2 ch-000172-gp clamp transistor 8 co-000213-gp conn 2 pin straight wafer 2 j207, j425 co-000214-gp conn 3 pin straight wafer 5 j108, j208, j257, j401, j402 co-000215-gp conn 4 pin straigh...

  • Page 67

    Technical service manual 65 isa series power amplifiers re-004702-gp rmg 1/10w 47 ohm 5% 0805 5 r25, r170, r189, r270, r289 re-007506-gp rmg 1/10w 75 ohm 5% 0805 4 r124, r224, r127, r227 re-010006-gp rmg 1/10w 100 5% 4 r109, r110, r209, r210 re-010007-gp rmg 1/8w 100 ohm 5% 1206 2 r30, r197 re-01000...

  • Page 68

    66 qsc audio products, llc td-000163-00 rev. B 6.10 isa1350 parts and assemblies isa1350 power amplifier 120v: qsc part # fg-001350-00 230v: qsc part # fg-001350-02 qsc part # description qty. Reference comments ch-000390-gp top cover isa1350 1 co-000228-gp euro 3 pin connector, grn 2 lb-000438-gp l...

  • Page 69

    Technical service manual 67 isa series power amplifiers ca-215004-gp cm 250v .0015uf 5% rl 1 c114 ca-222007-gp 50v .0022uf 10% 1206 6 c122, c125, c126, c164, c165, c170 ca-222012-gp 0.0022uf, 5 pcnt, 250v, radial, , 1 c121 ca-233006-gp 0.0033uf 5% 50v cer x7r 0805 1 c102 all 220–240v only ca-247003-...

  • Page 70

    68 qsc audio products, llc td-000163-00 rev. B ms-000193-gp heatsink, bridge rectifier, 40mm, , 2 q110, q111 ms-000220-gp fuse t1a 250v sem/ude 5x20mm 1 f201 nw-040001-gp nut keps m4 3 nw-040002-gp spring washer m4 x 7 1 nw-040003-gp i/t washer m4x0.4x8, yz 2 nw-040006-gp hex nut m4 x 0.7 x 7mm 1 nw...

  • Page 71

    Technical service manual 69 isa series power amplifiers re-.39001-gp 3.9 5% 5w metal film 6 r243–r246, r266, r268 re-.47002-gp 4.7 1% 1/8w metal film 1206 2 r197, r202 re-.56006-gp rmf 2w 5.6 ohm 5% 1 r254 re-000005-gp polyswitch 1.1a 0.15 ohm 1.5w 4 r9–r12 re-000231-gp ntc 10k 1% -3.7% per c 1 r239...

  • Page 72

    70 qsc audio products, llc td-000163-00 rev. B re-310008-gp 100k 1% 1/8w thk flm 1206 18 r109, r110, r155–r158, r162–r165, r167–r170, r179–r182 re-315004-gp rmg 1/8w 150k 1% 1206 3 r113, r114, r142 re-318001-gp 180k 1% 1/4w metal film 1 r14 re-318002-gp 180k 1% 1/8w thk flm 1206 1 r13 re-346401-gp 4...

  • 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

    100 qsc audio products, llc td-000163-00 rev. B gray shading indicates signal path plot date: wed sep 05, 2001 scale: none size d fscm no. Dwg no. Sheet 2 of 4 sh–003001–00 cad file no: sh8001ra.Sch rev a isa 300t page 1 of 3 this document contains proprietary information that is the property of qsc...

  • Page 103

    Technical service manual 101 isa series power amplifiers gray shading indicates signal path plot date: wed sep 05, 2001 scale: none size d fscm no. Dwg no. Sheet 3 of 4 sh–003001–00 cad file no: sh8001ra.Sch rev a isa 300t page 2 of 3 this document contains proprietary information that is the proper...

  • Page 104

    102 qsc audio products, llc td-000163-00 rev. B plot date: wed sep 05, 2001 scale: none size d fscm no. Dwg no. Sheet 4 of 4 sh–003001–00 cad file no: sh8001ra.Sch rev a isa 300t page 3 of 3 this document contains proprietary information that is the property of qsc audio products, which may not be d...

  • 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

    112 qsc audio products, llc td-000163-00 rev. B gray shading indicates signal path isa 500t 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 express written consent from qsc audio products. A...

  • Page 115

    Technical service manual 113 isa series power amplifiers gray shading indicates signal path see sh 2 isa 500t 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 qsc...

  • Page 116

    114 qsc audio products, llc td-000163-00 rev. B isa 500t page 3 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 qsc audio products. A b c d a b c d 8 7 6 5 4 3 2 1 8 7 ...

  • 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

    124 qsc audio products, llc td-000163-00 rev. B gray shading indicates signal path notes: unless otherwise specified a 2 sh–008001–00 rev sh d w g no . This document contains proprietary information that is the property of qsc audio products, which may not be disclosed, reproduced or used without ex...

  • Page 127

    Technical service manual 125 isa series power amplifiers gray shading indicates signal path a 3 sh–008001–00 rev sh d w g no . Isa 800t 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 expres...

  • Page 128

    126 qsc audio products, llc td-000163-00 rev. B a 4 sh–008001–00 rev sh d w g no . Maintain full pri-sec creepage muting and thermal protection this document contains proprietary information that is the property of qsc audio products, which may not be disclosed, reproduced or used without express wr...

  • 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: Channel 2

    130 qsc audio products, llc td-000163-00 rev. B channel 2 channel 1 7.14 isa750, isa800t, isa800ti component locations.

  • Page 133: Channel 2

    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 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.