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QSC PLX Series Technical & Service Manual

Other manuals for PLX Series: Owner's Manual

Summary of PLX Series

  • Page 1

    Technical ser vice manual plx™ series ▲ ▲ ▲ ▲ ▲ plx 1202 ▲ ▲ ▲ ▲ ▲ plx 1602 ▲ ▲ ▲ ▲ ▲ plx 2402 ▲ ▲ ▲ ▲ ▲ plx 3002 td-000078-00 td-000078-00

  • Page 2

    Plx 1202 plx 1602 plx 2402 plx 3002.

  • Page 3: Plx 1202

    Plx series service manual plx 1202 plx 1602 plx 2402 plx 3002 qsc technical services wats: i local: 1-714-957-7150 fax: 1-714-754-6173 qsc technical support bbs i -714-668-7567 1-800-856-6003 qsc audio products, inc. 1675 macarthur blvd. Costa mesa, ca 92626 http://www.Qscaudio.Com.

  • Page 4

    Table of contents plx product specifications ................................................................ Introduction ........................................................................................ Test and calibration ......................................................................

  • Page 5

    Plx product specifications plx 1202 plx 1602 plx 2402 plx 3002 202 602 plx2402 plx3002 output power (per channel): continuous average output power both channels driven: 8 ohms, 2ohz - 2okhz 0.03% t h d 200 watts 4 ohms, 2ohz - 2okhz 0.05% t h d 325 watts average output power bridged mono ooeration: ...

  • Page 6

    I n t r o d u c t i o n this manual is prepared to assist service personnel with the repair and calibration of plx power amplifiers the procedures described in this manual require advanced technical experience and sophisticated audio test equipment. Caution: to reduce the risk of electric shock, do ...

  • Page 7: Plx 1202 Test Procedure

    T e s t & c a l i b r a t i o n plx 1202 test procedure set-up 1. Connect a test load to the output terminals of the amplifier. 2. Make sure mode switches 1 - 10 are in the default position (1 on, 10 on, all others off). 3. Connect a distortion analyzer with a resolution of 20-2okhz (or better) to t...

  • Page 8

    5. Turn power off and place the amplifier back into the stereo mode with output loads connected to each channel. . Bias 1. Let the amplifier cool down to room temperature. 2. With an input amplitude of 1.3ovrms increase the input frequency to 2okhz. Reduce the input signal 20db (80%) from full outpu...

  • Page 9: Plx 1602 Test Procedure

    4. Verify that the ntc circuit causes thermal shutdown after an extended period. 5. When thermal shutdown occurs, verify ac idle current of less that 0.90 amperes l c m t e s t 1. Select an 8 ohm load and confirm that this amplifier is producing rated power. 2. Check the common mode of the amplifier...

  • Page 10

    3. Turn the power switch off and on a few times to verify the 3 second power-up muting delay. . Channel output 1. Look for amplified signal on the scope for channel 1. Switch the input signal and scope to channel 2 and repeat output test. Check for noisy / contaminated gain pots by observing general...

  • Page 11: Plx 2402 Test Procedure

    L frequency response set load to 8 ohms and scale the input generator to gain 1 watt of power from the amplifier on each channel. Gain controls on the amplifier should be fully up. 2. Check frequency response from 2ohz to 20khz 0.2odb) by sweeping random frequencies between these extremes. This is d...

  • Page 12

    3. Connect a distortion analyzer with a resolution of 20-20khz (or better) to the output terminals of the amplifier. Enable the 80khz low pass filter. 4. Connect a dual-channel oscilloscope to the following test points: chl - a 1ox (vertical sensitivity - 2v/cm) scope probe to the channel speaker ou...

  • Page 13

    Disable the 80khz lowpass filter on the analyzer for this test. Further trim so that the total distortion for that channel is less than 0.1% thd+n, 3. With the trim settings achieved, and with no signal plugged into the amplifier and with an 8 ohm load, verify that the ac idle current from the ac se...

  • Page 14: Plx 3002 Test Procedure

    L output noise 1. Set the amplifier gain controls all the way up, with a i khz 1.5ovrms sinewave input signal. Note the output level at full power just below clipping. Adjust gain if needed. 2. Remove the input signal connector from the amplifier and measure the residual noise level produced into th...

  • Page 15

    2. Select an 8 ohm load and confirm that this amplifier is producing 550 watts at 1 khz just below the point of clipping. Check both channels. L bridge mode 1. Turn the power switch off. 2. Set mode switch #7 in the on position. The gain control, limiter, and filter switch positions on ch2 are disab...

  • Page 16

    L power vs. Distortion test 1. Check to ensure that both channels will produce rated power at 2khz, and 20khz. Into an 8 ohm load. 2. While verifying rated power, check that at all frequencies the distortion measurement is less than or equal to 0.03% thd. L thermal test i. Set input frequency to 1 k...

  • Page 17

    T r o u b l e s h o o t i n g plx 1202 l plx 1602 l plx 2402 l plx 3002 power supply - - replacing blown igbts. In order to improve emi performance, reduce cost, and increase current capacity, the plx are driven by an active, direct coupled integrated circuit, rather than a gate drive transformer. I...

  • Page 18

    Troubleshooting “top-210” bias supply. Quick test of bias supply. Ramp the ac voltage up slowly to 25% of regular voltage (30v for 12ov unit). If the bias supply is working normally, the green “power” led should come on between 30 and 35v, with its usual, steady start-up level. Caution: if the led c...

  • Page 19

    Check emitter and base resistors while devices are removed, each output transistor has an associatated pair of 0.47 ohm resistors in parallel. Each bank of output transistors has a 15 ohm resistor from base to rail (emitter bus). Audio outputs, troubleshooting current limit weak current limit -- pre...

  • Page 20

    Audio power stage, current limit troubleshooting current limits which collapse prematurely. An immediate collapse of all current limits at full power could be premature triggering of “power supply cutback”, which is described in the section below. Cutback after several seconds of full power operatio...

  • Page 21

    Clamping voltage decreases, but no current cutback channel-polarity ch ch ch 2+ ch 2- measure voltage on: c21 c22 c56 check clamp transistor q18 q23 q63 q68 if the measured voltage on the clamp capacitor is not decreasing to about 50% during the short, check the circuitry which measures the current ...

  • Page 22

    Audio output, troubleshooting stability feedback high frequency oscillations severe-draws current-gross distortion c27 (62) missing or wrong, or series r367 (368) c 25, 26 (60, 61) missing secondary filter capacitors missing or open (unlikely that all are defective). Severe, but does not draw large ...

  • Page 23

    Clip limiting doesn’t work: both channels: check u3 missing, check u3 supply voltages, 3vcl, -13vcl, on 74 only one channel bad: probe output of u2 (7), pin 7 while clipping. If output exceeds 4v during clipping, check : r38 (161) missing. R38-39 (161-162) have wrong values. Q9, 10 (54, 55) missing....

  • Page 24

    Step chattering. If the step repeatedly switches on and off, usually at a low frequency, it creates an oscillation burst which increases step glitch at low frequency. The tendency is usually worse at low impedances and low frequencies. 2-3 “false trials” at very low frequency, 2 ohms, is normal, but...

  • Page 25

    Fet turns on or off very slowly: generally causes problems at high frequency, 2 ohms. If both slopes are equally slow, check the slope capacitors: positive, c30 and negative, c29 if only one slope is slow, check the resistors and buffer transistors: positive step: r78, 79, q30-31 (r201, 202, d40, q7...

  • Page 26: Fan Speed Troubleshooting

    Fan speed troubleshooting fan stuck high: q88 or q89 failed r30 or thermal sense ntc, shorted to heatsink r266 or r271 missing. Fan doesn’t run check fan voltage, should be 1 iv when cold, 29v when hot. Voltage ok -- replace fan. No voltage: check q91, 89, 90, r264 and 265 missing. Confirm that +/-1...

  • Page 27

    Plx 1202 pcb assembly (12ov) plx 1202 pcb assembly (12ov) cont’d part number description reference ca-01 0002-30 cap 1 opf 5% 50v 0805 smt c14,49 ca-01 5002-10 cap cer 15pf 10% 5oov sl ca-i 10002-30 cap cer 1 oopf 5% 5ov npo sm c40,41,43, c5,6,9,18, c53 ca-i 33001-10 cap sm 330pf 5% 500v ca-i 47003-...

  • Page 28

    Plx 1202 pcb assembly (12ov) cont’d plx 1202 pcb assembly (12ov) cont’d part number description reference part number description reference q70,89,90, q92,93,95 qd-000104-30 xistor pnp smt 40v .2a .2w q44-48,51, q55,57,59, re-027401-30 res smt 274 1% ow 1 oov re-038301-30 res smt 383 1% re-047001-10...

  • Page 29

    Plx 1202 pcb assembly cont’d plx 1202 pcb assembly cont’d part number description reference part number description reference sc-0631 oo-pp sc-081 wc-0001 17-02 res smt 1% res smt 1% res smt 1% 1206 res mf 16 1% res smt 1% res smt 1% r325 res mofp 30k 5% 2w mini res smt 1% r332 res smt47 5k 1% res s...

  • Page 30

    Plx 1202 assembly (230v) cont’d plx 1202 pcb assembly (230v) cont’d part number description reference part number description reference ca-610002-10 elect ca-647001-10 cap lytic rl 47uf 10% np ca-647002-1 0 cap lytic rl 47uf 20% ca-71 0002-10 cap lytic rl 1 oouf 20% cl43 ca-71 0004~10 cap lytic rl 1...

  • Page 31

    Plx 1202 pcb assembly (230v) cont’d plx 1202 pcb assembly (230v) cont’d part number description reference part number description reference re-005606-10 re-010002-30 re-038301-30 re-110006-30 re-120002-30 re-139002-10 r373 thermistor ntc cur r324 thermistor ntc 5% res smt 10 ohm 5% 1206 res mofp 5% ...

  • Page 32

    Plx 1202 pcb assembly (230v) cont’d plx 1202 chassis assembly (230v) part number description reference part number description reference relay, spkr kl sw-000053-00 switch dip io-pos, tall sw1 jmpr bare 0.2” 20awg sld ch-000097-00 ch-000100-00 ch-000112-00 lb-000053-00 lb-000077-00 lb-000099-01 lb-0...

  • Page 33

    Plx 1602 pcb assembly cont’d plx 1602 pcb assembly cont’d part number description reference ca-410006-30 cap cer 10% smt cl91 ca-410011-00 cap mmyl .Luf 10% 400v ca-422001-10 cap mylar 5% ca-447001 -00 cap met poly 20% 250 cl 17 ca-447003-00 cap polyp 47uf 10% 400v cl44 ca-51 0005-30 cap lytic 1 uf ...

  • Page 34

    Plx 1602 pcb assembly cont’d plx 1602 pcb assembly cont’d part number description reference part number description reference xistor pnp to-3p 200v xistor npn to-3p 200v diode znr 5% 1 w 1 diode rect do27 200v 3a res mofp 5% 2w mini r l l l - 1 1 4 , res mofp 5.6 5% 2w mini r373 re-115002-30 res smt...

  • Page 35

    Plx 1602 pcb assembly cont’d plx 1602 pcb assembly (230v) part number reference re-220003-30 1% 1206 res smt 1% ow 1 oov r325 res mofp 30k 5% 2w mini re-239202-30 res smt 1% ri 84,243, r332 res smt 47 1% res smt 1% res smt 1 ook 5% 1206 res mf 1% 1206 res smt 392k 1% re-348702-30 res mf 487k 1% 1206...

  • Page 36

    Plx 1602 pcb assembly (230v) cont’d plx 1602 pcb assembly (230v) cont’d part number description reference cap rl 2200uf 20% 200v ch-000102-00 heatsink, audio, plx spring, clamp, 2 hole ps plx ch-00011 i-00 pcb plc platform ch-000114-00 clamp, 2 finger plx speakons, pc mount co-000148-00 conn xlr f v...

  • Page 37

    Plx 1602 pcb assembly (230v) cont’d plx 1602 pcb assembly (230v) cont’d part number description reference r e s 39.2 i % i 20 part number description reference re-175002-30 res 1% ri res smt ow oov re-i 90902-30 res smt 1% l/l ow r272 re-005606-10 res mofp 56 5% 2w mini res smt 75 1% res smt 100 1% ...

  • Page 38

    Plx 1602 pcb assembly (230v) cont’d plx 1602 chassis assembly (230v) part number description reference wc-000001-10 jumper ins 22awg solid w r224 wc-000103-00 cable 20 pin wc-0001 ac switch wire, long to switch wc-0001 15-01 ac switch wire, red, short wc-0001 ac switch wire, red, short to switch wc-...

  • Page 39

    Plx 2402 pcb assembly plx 2402 pcb assembly cont’d part number reference ca-01 cap 1 opf 5% 0805 smt ca-01 cap cer 10% 500v sl ca-047002-30 cap cer 47pf 5% npo smt cl93 ca-1 10001-10 cap sm ioopf, 500v cl47 ca-i 10002-30 cap cer ioopf 5% npo sm ca-i 33001-10 cap sm 330pf 5% 500v ca-i 47003-30 cap 47...

  • Page 40

    Plx 2402 pcb assembly cont’d plx 2402 pcb assembly cont’d part number description reference part number description reference q86 diode rect ultrafast 400v 3 led grn t-l qd-000053-00 led yel t-l led red t-l xistor npn to-92 40v 1.5 xistor pnp to-92 40v xistor npn to-220 xistor pnp to-220 diode sw sm...

  • Page 41

    Plx 2402 pcb assembly cont’d plx 2402 pcb assembly cont’d part number description re-082001-10 res mofp 820 5% 2w mini 10006-30 res smt 1 1% 1206 res smt 1% re-115002-30 res smt 1% re-120002-30 res smt 1% re-122103-30 res 1% re-130102-30 res smt 1% re-139002-10 res mofp 3 5% 2w mini res smt 1% res 2...

  • Page 42

    Plx 2402 pcb assembly cont’d plx 2402 pcb assembly (230v) cont’d part number reference part number description reference wc-0001 speaker wire, black ref: wc-0001 1 wire long ref: wc-0001 wire red, short eli-el2oa wc-0001 18-01 wire red, short ref: xf-000005-00 bead ferrite lead choke common mode ind...

  • Page 43

    Plx 2402 pcb assembly (230v) cont’d plx 2402 pcb assembly (230v) cont’d part number description reference part number description reference ms-i pc-000531 -00 pl-000128-00 pl-000135-00 0000-cr qd-000053-00 qd-000054-00 qd-000062-10 qd-000063-10 qd-000076-00 qd-000077-00 qd-000105-30 qd-000106-30 dua...

  • Page 44

    Plx 2402 pcb assembly (230v) cont’d plx 2402 pcb assembly (230v) cont’d part number description reference part number description reference re-010002-30 res smt 100 1% re-015004-10 res mofp 150 5% 2w mini re-020002-30 res smt 200 1% res smt 274 1% re-038301-30 res smt 383 1% re-047001-10 res mofp 47...

  • Page 45

    Plx 2402 pcb assembly (230v) plx 2402 chassis assembly (230v) part number reference part number description reference sc-0631 00-pp sw-000053-00 wc-000001-1 0 wc-0001 wc-0001 wc-0001 wc-0001 17-00 wc-0001 wc-0001 wc-0001 wc-0001 wc-0001 18-00 xf-000023-00 res mf 5% x type 1 xrece x type 1 p/p black ...

  • Page 46

    Plx 3002 pcb assembly plx 3002 pcb assembly cont’d part number reference part number description reference ca-01 0002-30 ca-01 ca-047002-30 ca-110001-10 ca-l 10002-30 ca-133001-10 ca-i 47003-30 ca-168003-30 ca-21 ca-222001 -00 ca-227001-30 ca-233001 -10 ca-233002-00 ca-31 0004-30 ca-322001 -10 ca-41...

  • Page 47

    Plx 3002 pcb assembly cont’d plx 3002 pcb assembly cont’d part number description reference insulator, mica 1.25” x 1.75” res var it 250 20% car pt-31 oooo-cr res var it 1 ok 20% diode to220 ultrafast 200v diode to220 ultrafast 200v 1 1 ov zener 1 w fet nchan to220 60v 50a diode rect ultrafast 400v ...

  • Page 48

    Plx 3002 pcb assembly cont’d plx 3002 pcb assembly cont’d part number description reference part number description reference res mofp 5% 2w mini res smt 200 1% res smt274 1% res smt 383 1% res mofp 470 5% 2w mini res smt 475 1% 1 ow 1 oov res smt 536 re-063402-30 res smt 634 1% 1206 res mofp 820 5%...

  • Page 49

    Plx 3002 pcb assembly cont’d plx 3002 pcb assembly (230v) cont’d part number description reference re-339201-30 res 392k 1% ri 92,260, mf i % i 2 0 6 res mf 750k 2% r e s 1.0 m e g 5% x i x i b l a c k relay, spkr kl sw-000053-00 dip io-pos, sw1 wc-o jmpr ins 0.5” sld wc-000001-10 jumper ins 22awg s...

  • Page 50

    Plx 3002 pcb assembly (230v) cont’d plx 3002 pcb assembly (230v) cont’d part number description reference cl.50 ca-722001 -10 cap rl 220uf 20% 1 ov n ca-747001 -10 cap rl 470uf 20% cl31 ca-747004-00 cap rl 470uf 20% 1 oov cl 52,153, cap rl 470uf 20% 63v cap rl 2200uf 20% 200v cap rl 2200uf 20% 200v ...

  • Page 51

    Plx 3002 assembly (230v) cont’d plx 3002 pcb assembly (230v) cont’d part number description reference part number description reference qal ,a4 npn 200v r e s i % re-047001-10 res mofp 470 5% 2w mini res 475 1% diode znr 5% diode do27 200v 3a res mofp 5% 2w mini res mofp 5% 2w mini res mofp 1.5 5% 2...

  • Page 52

    Plx 3002 pcb assembly (230v) cont’d plx 3002 pcb assembly (230v) cont’d part number description reference part number description reference res smt 1% ri mf i % 1 2 0 6 res smt 1% res smt 1% r272 res smt 1% res smt 7k 1% res smt 1% r337 re-410001-30 sc-0631 oo-pp sc-oai sw-000053-00 wc-000001 -10 wc...

  • Page 53

    Plx 3002 chassis assembly (230v) part number description reference chassis, plx ch-000100-00 handle-ear casting plx ch-000112-00 shield, ac, plx lb-000053-00 french, fuse replacement lb-000077-00 energy lb-000099-01 label, ce listing lb-00021 3-00 label, faceplate plx 3002 lb-00021 label, input/outp...

  • Page 54: Plx Series

    0 g g s op-amp dual operational amplifier plx series semiconductor identification tmos fet tmos power field effect transistor op-amp tl072 small signal transistors dual operational amplifier npn pnp driver transistors npn pnp power transistors npn pnp l c e c 50

  • Page 55: Plx Series

    Plx series semiconductor identification timer dual timer pwm switch pwm mosfet gate driver top21 0 op-amp 3600 op-amp mc33078 dual transconductance operational amplifier dual low noise operational amplifier comparator voltage comparator gallium arsenide led coupled to phototransistor..

  • Page 56: Plx Series

    Plx series semiconductor identification insulated gate bipolar transistor pwm regulating pulse width modulator comparator low power dual comparators 202, insulated gate bipolar transistor n-channel e side driver high speed mosfet i driver driver vdd sd lo ho v s v c c shutdown low side input low sid...

  • Page 57

    Screw, x 3 x handle-ear 2 knob 2 faceplate label chassis assembly a - a l h e x n u t p a r t o f p h o n e j a c k o n 3 9 ( p c b a s s y ) . 1. This u s e d i n c o n j u n c t i o n s c h e m a t i c m a i n p c b a s s y s h - 0 0 0 5 4 1 - 0 0 , d i a g r a m s h - 0 0 0 5 4 0 - 0 0 a n d f i ...

  • Page 60

    Plx main assembly.

  • Page 61

    57 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 62

    58 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 63

    59 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 64

    60 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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  • Page 66

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  • Page 67

    63 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 68

    64 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 69

    65 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 70

    66 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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    67 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

  • Page 72

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    69 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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    70 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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    71 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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    72 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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    75 d c b a d c b a 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 qsc audio products. Without express written consent from be disclosed, reproduced or used of qsc audio products, that may not information which is the property this document contains proprietary size fscm no. Dwg no. Scale cad file no. Sheet rev d d...

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  • Page 83

    “qsc” and the qsc logo are registered trademarks of qsc audio products, inc. 1675 macarthur blvd. Costa mesa, ca 92626 (800) 772-2834 fax (714)754-6173 www.Qscaudio.Com.