QSC PLX Series Technical & Service Manual
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QSC PLX Series Technical & Service Manual

Plx series
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PLX™ Series
PLX 1202
PLX 1602
PLX 2402
PLX 3002
TD-000078-00
TD-000078-00

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Summary of Contents for QSC PLX Series

  • Page 1 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: Service Manual

    PLX SERIES SERVICE MANUAL PLX 1202 PLX 1602 PLX 2402 PLX 3002 QSC Technical Services Wats: I -%OO-772-2034 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 3002 Chassis Assembly (230V) PLX Semiconductors ................Chassis Drawings ................... Schematics ............. PLX 1202 Main PCB Schematics ............. PLX 1602 Main PCB Schematics ............. PLX 2402 Main PCB Schematics ............. PLX 3002 Main PCB Schematics PLX Series PCB Circut Board Drawings ..........

  • Page 5: Plx Product Specifications

    PLX Product Specifications PLX 1202 PLX 1602 PLX 2402 PLX 3002 PLXI 202 PLXI 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 300 waKs 425 watts 550 watts 4 ohms, 2OHz - 2OkHz, 0.05% T H D...

  • Page 6: Introduction

    Parts orders to QSC should include the product model number, the part description, and the QSC part number (from the parts list in this manual). Parts will be shipped via UPS, F.O.B. Costa Mesa, California. Shipping, handling and COD charges may be added to the cost of the parts.

  • Page 7: Test And Calibration

    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.
  • 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 output.
  • Page 9 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 C M T E S T 1. Select an 8 ohm load and confirm that this amplifier is producing rated power. 2.
  • 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 instability on the distortion waveform while adjusting the gain control levels.
  • Page 11 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 (+I- 0.2OdB) by sweeping random frequencies between these extremes.
  • Page 12 3. Connect a distortion analyzer with a resolution of O.Ol%, 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 output. Ch2 - a IX scope probe (vertical sensitivity - 0.
  • 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 service is no more than 1 .O amperes.
  • Page 14 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 the load by the amplifier.
  • 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. 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 disabled with Mode Switch # 7 on.
  • Page 16 POWER vs. DISTORTION TEST 1. Check to ensure that both channels will produce rated power at 2OH2, 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. THERMAL TEST I.

  • Page 17: Troubleshooting Plx

    T r o u b l e s h o o t i n g PLX 1202 PLX 1602 PLX 2402 PLX 3002 Power Supply - - Replacing Blown IGBTs. In order to improve EMI performance, reduce cost, and increase current capacity, the PLX IGBTs are driven by an active, direct coupled integrated circuit, rather than a gate drive transformer.
  • 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 “half-brighf’ start-up level.
  • 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 -- PREMATURE CLIPPING.
  • 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 operation at two ohms is normal.
  • Page 21 CLAMPING VOLTAGE DECREASES, BUT NO CURRENT CUTBACK CHANNEL-POLARITY CH I+ CH l- CH 2+ CH 2- Measure voltage on: Check clamp transistor If the measured voltage on the clamp capacitor is not decreasing to about 50% during the short, check the circuitry which measures the current during short circuit, CLAMPING VOLTAGE DOES NOT DECREASE TO 50% DURING SHORT.
  • 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 CURRENT R22 (146) open.
  • Page 23 CLIP LIMITING DOESN’T WORK: BOTH CHANNELS: Check U3 missing, Check U3 supply voltages, +I 3VCL, -13VCL, on C73* 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.
  • 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 prolonged bursts of maximum frequency chattering may cause FET failure.
  • 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 (035) and Negative, C29 (034). If only one slope is slow, check the resistors and buffer transistors: Positive step: R78, 79, Dl5, Q30-31 (R201, 202, D40, Q75-76) Negative step: R83, 84, Dl7, Q32-33 (R206, 207, D42, Q77-78).
  • Page 26 Fan Speed Troubleshooting FAN STUCK HIGH: Q88 or Q89 failed R30 or Rl55, 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.

  • Page 27: Plx 1202 Pcb Assembly (120V)

    PLX 1202 PCB ASSEMBLY (12OV) Cont’d PLX 1202 PCB ASSEMBLY (12OV) Reference Description Reference Part Number Description Part Number Cl65,166, CA-01 0002-30 CAP 1 OPF 5% 50V 0805 SMT c14,49 Cl6,50 Cl69,170 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, CA-822200-AE CAP LYTIC RL 22OOUF 20% 200V Cl 32,133 C5,6,9,18,...
  • Page 28 PLX 1202 PCB ASSEMBLY (12OV) Cont’d PLX 1202 PCB ASSEMBLY (12OV) Cont’d Part Number Reference Description Part Number Description Reference Q70,89,90, R21,27,70, Q92,93,95 R364,381, QD-000104-30 XISTOR PNP SMT 40V .2A .2W Ql-4,6,10, R382-384 Ql2,14,23, R71,144? Q24>42143, RE-027401-30 RES SMT 274 1% l/l OW 1 OOV RI 91,204, Q44-48,51, R205...

  • Page 29: Plx 1202 Pcb Assembly (230V)

    PLX 1202 PCB ASSEMBLY (12OV) Cont’d PLX 1202 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference Rl34,139, WC-0001 18-00 WIRE ASSY, BLK, LONG EHI-EH2 Rl4,16,19, REF: Rl42,169, WC-0001 18-01 WIRE ASSY, RED, SHORT ELI-EIZOA Rl88,199, WC-0001 18-01 WIRE ASSY, RED, SHORT REF: R200,241, XF-000005-00 BEAD FERRITE WI2OAWG LEAD L9,lO...
  • Page 30 PLX 1202 PC6 ASSEMBLY (230V) Cont’d PLX 1202 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Description Part Number Reference CA-610002-10 lOUF,35V,2O%,RADlAL ELECT Cl92 QD-000062-10 XISTOR NPN TO-92 40V 0.2A 1.5 Q20,65 c3,3a,ao, QD-000063-10 XISTOR PNP TO-92 40V 0.2A 1.5 Q21,66 C86,114, QD-000076-00...
  • 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-156001-10 RES 5.6OK .I% 1/4W 25PPM R373 Rl3,129, R80,98, Rl30,135, RE-00021 O-NR THERMISTOR NTC 15A CUR LIM R324 RI36 RE-000230-NR THERMISTOR NTC IOK 5% R30,155 R8,9,12,...

  • Page 32: Plx 1202 Chassis Assembly (120V)

    PLX 1202 PCB ASSEMBLY (230V) Cont’d PLX 1202 CHASSIS ASSEMBLY (230V) Part Number Description Reference Part Number Description Reference SW-000029-S RELAY, SPKR PROTECT,SPDT,2 Kl CH-000097-00 CHASSIS, PLX SW-000053-00 SWITCH DIP IO-POS, TALL CH-000100-00 HANDLE-EAR CASTING PLX WC-0.2020-JW JMPR BARE 0.2” 20AWG SLD D22,46,47 CH-000112-00 SHIELD, AC, PLX...
  • Page 33 PLX 1602 PCB ASSEMBLY (12OV) Cont’d PLX 1602 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference Cl56,157 MS-0001 12-00 FUSE 25A 125V 3AG FAST CER C28,63, PC-000531-00 PCB MAIN PLX CA-410006-30 CAP CER .lUF 10% 5OVX7R SMT Cll6,125, PL-000114-00 INSULATOR, lGBT/RECT HS, PLX c135155, PL-000126-00 SPRING, SEAT, PLX...
  • Page 34 PLX 1602 PCB ASSEMBLY (12OV) Cont’d PLX 1602 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference QD-001302-PN XISTOR PNP TO-3P 200V 15A Q28_34136> R232,250, Q39,73,79> R252,369 Q81,84 RE-115002-30 RES SMT 1.5OK 1% l/lOW 1OOV RlOl,lO9, QD-003281-NP XISTOR NPN TO-3P 200V 15A Q29,35,37, Rl47,154, Q40,74,80,...

  • Page 35: Plx 1602 Pcb Assembly (230V)

    PLX 1602 PCB ASSEMBLY (230V) PLX 1602 PCB ASSEMBLY (12OV) Cont’d Part Number Descritdion Part Number Description Reference Reference RE-220003-30 RES SMT 2O.OK 1% 1/8W 1206 Rl72,173 CA-01 0002-30 CAP 1 OPF 5% 5OV 0805 SMT c14,49 CA-01 5002-10 Cl6,50 R49,50, CAP CER 15PF 10% 500V SL RE-224901.30 RES SMT 24.9K 1% l/l OW 1 OOV...
  • Page 36 PLX 1602 PCB ASSEMBLY (230V) Cont’d PLX 1602 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference Cl59,160, Q57A% Cl65166, Q52,53354, Cl69,170, Q58y607631 c173,174 Q70,89,90, CA-822200-AE CAP LYTIC RL 2200UF 20% 200V Cl32,133, Q92,93,95 Cl36,137 QD-000104-30 XISTOR PNP SMT 40V .2A .2W Ql-4,6,10, CH-000102-00 HEATSINK, AUDIO, PLX Ql2,14,23,...
  • Page 37 PLX 1602 PCB ASSEMBLY (230V) Cont’d PLX 1602 PCB ASSEMBLY (230V) Cont’d Part Number Reference Description Part Number Description Reference Ra5-a7,90x RE-175002-30 RES SMT7.5OK 1% l/lOW IOOV Rl20,132, R93,2oa, Rl40,161 RE-003921-30 SMT 39.2 OHM % liaw 20 R246-249, RI 5,3a, R E S R349,357 RE-I 7a701-30 RES SMT 7.a7K I % l/l OW I OOV...

  • Page 38: Plx 1602 Chassis Assembly (120V)

    PLX 1602 CHASSIS ASSEMBLY (230V) PLX 1602 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference REF:D87,88 CH-000097-00 CHASSIS, PLX WC-000001-10 JUMPER INS .6” 22AWG SOLID W R224 CH-000100-00 HANDLE-EAR CASTING PLX CH-000112-00 SHIELD, AC, PLX WC-000103-00 CABLE ASSY, 20 PIN 9”L J3-4,J5-6 LB-000053-00 LBL, FRENCH, FUSE REPLACEMENT WC-0001 15-00 AC SWITCH WIRE, BLK, LONG...

  • Page 39: Plx 2402 Pcb Assembly (120V)

    PLX 2402 PCB ASSEMBLY (12OV) PLX 2402 PCB ASSEMBLY (12OV) Cont’d Part Number Reference Descridion Reference Part Number Description CA-01 0002-30 CAP 1 OPF 5% 5OV 0805 SMT c14,49 Cl5,32,51, CA-01 5002-10 CAP CER 15PF 10% 500V SL Cl&50 C67172378, c79,33, CA-047002-30 CAP CER 47PF 5% 5OV NPO SMT Cl93 C29,30,64,...
  • Page 40 PLX 2402 PCB ASSEMBLY (12OV) Cont’d PLX 2402 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference Q40,74,80, QD-000042-00 DIODE RECT ULTRAFAST 400V 3 D70,71 Q82,85 QD-000052-00 LED GRN T-l LD2,3,4,7, QD-004744-ZA DIODE ZNR 15V 5% 1 W 1 N4744A D53,54,87 LD8,9,11 QD-005402-DX DIODE RECT DO27 200V 3A Dl9,20,44,...
  • Page 41 PLX 2402 PCB ASSEMBLY (12OV) Cont’d PLX 2402 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference RE-082001-10 RES MOFP 820 5% 2W MINI R257 R245,259, RE-I 10006-30 RES SMT 1 .OOK 1% 1/8W 1206 Rl?7?42> R329,337> Rll7,118, R36,45,46, Rl28,165,...

  • Page 42: Plx 2402 Pcb Assembly (230V)

    PLX 2402 PCB ASSEMBLY (12OV) Cont’d PLX 2402 PCB ASSEMBLY (230V) Cont’d Part Number Descriution Reference Part Number Description Reference WC-0001 17-03 SPEAKER WIRE, BLACK EIOA-IOC Cl83,185, REF: Cl89,190, WC-0001 1 a-00 WIRE ASSY, BLK, LONG EHI-EH2 c19,39,54, REF: Cl91 WC-0001 18-01 WIRE ASSY, RED, SHORT ELI-El2OA CA-410011-00...
  • Page 43 PLX 2402 PCB ASSEMBLY (230V) Cont’d PLX 2402 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference IC-005532-OP IC LIN DUAL OP AMP 5532 EX/MP U2,7 D41,61,68, HEAT SINK, ISOL TO-220 REF:Q91 MS-000048-HS D78,79 MS-I 50250-FU FUSE 15A 25OV 3AG FAST CER QD-000110-30 DIODE ZNR 6.2V 5% .3W SMT PC-000531 -00...
  • Page 44 PLX 2402 PCB ASSEMBLY (230V) Cont’d PLX 2402 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference R71,123, R201,206 RE-010002-30 RES SMT 100 1% l/lOW IOOV Rl44,150, R29,78,83, R211271 RE-175002-30 RES SMT 7.5OK 1% l/lOW IOOV Rl20,132, R334,364, Rl40,161 Rl5,383...

  • Page 45: Plx 2402 Chassis Assembly (120V)

    PLX 2402 PCB ASSEMBLY (230V) Cont’d PLX 2402 CHASSIS ASSEMBLY (230V) Number Descriotion Reference Part Part Number Description Reference R326,328 CH-000097-00 CHASSIS, PLX RE-375005BM RES MF 75OK 5% 1/2W IOOPPM CH-000100-00 HANDLE-EAR CASTING PLX R339,371 SC-0631 00-PP #6-20 X 518” “AB” TYPE 1 XRECE CH-000112-00 SHIELD, AC, PLX SC-081101-SP...

  • Page 46: Plx 3002 Pcb Assembly (120V)

    PLX 3002 PCB ASSEMBLY (12OV) PLX 3002 PCB ASSEMBLY (12OV) Cont’d Part Number DescriDtion Reference Part Number Description Reference CA-01 0002-30 CAP 1 OPF 5% 5OV 0805 SMT c14,49 C57,89 CA-01 5002-10 CAP CER 15PF 10% 500V SL Cl6,50 CA-71 0002-10 CAP LYTIC RL IOOUF 20% 25V c102,104, CA-047002-30...
  • Page 47 PLX 3002 PCB ASSEMBLY (12OV) Cont’d PLX 3002 PCB ASSEMBLY (12OV) Cont’d Description Reference Part Number Description Reference Part Number QD-000153-00 DIOD RECT TO247 UFAST 400V 3 D72,73,84, Rl55,LDl, REF.R30, PL-000135-00 INSULATOR, MICA 1.25” X 1.75” REF:Q96,97 QD-000154-00 XISTOR NPN TO-220 230V Ql9,64 QD-000155-00 XISTOR PNP TO-220 230V Q22,67...
  • Page 48 PLX 3002 PCB ASSEMBLY (12OV) Cont’d PLX 3002 PCB ASSEMBLY (12OV) Cont’d Part Number Description Reference Part Number Description Reference R21,271 R55,56,59, R334,364, R62-64, R381-384 RE-156001-10 RES 5.6OK .I% 1/4W 25PPM Rl3,129, RE-015004-10 RES MOFP 150 5% 2W MINI R256,278 Rl30,135, RE-020002-30 RES SMT 200 1% l/lOW 1OOV R204,205...

  • Page 49: Plx 3002 Pcb Assembly (230V)

    PLX 3002 PCB ASSEMBLY (12OV) Cont’d PLX 3002 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference R335,341, c119,121, R342,343 c14a,iai, R52,54,57, cia2,ia6, R5a,l75! ciaa RE-339201-30 RES SM-r 392K 1% l/lOW IOOV Rl45,la9, C26,36,37, RI 92,260, C52,61, R24,66,69, CA-16aOO3-30 CAP CER 6aOPF 5% 50V NPO SM C25,60,6a, R263,340...
  • Page 50 PLX 3002 PCB ASSEMBLY (230V) Cont’d PLX 3002 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference OV ZENER 1 W Cl.50 QD-000021 -QD 1 N4740 D7,32,aa CA-722001 -10 CAP LYTIC RL 220UF 20% 1 OV N QD-000031-QD FE-r NCHAN TO220 60V 5OA Q3a,41 !a3, C91,92...
  • Page 51 PLX 3002 PCB ASSEMBLY (230V) Cont’d PLX 3002 PC6 ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference RE-038301-30 SMT 383 % IIIOW 100~ Q39,73,79, R2543255 R E S Qal ,a4 R44,167, QD-003281-NP XISTOR NPN TO-3P 200V 15A Q29,35,37, RE-047001-10 RES MOFP 470 5% 2W MINI R274-277>...

  • Page 52: Plx 3002 Chassis Assembly (120V)

    PLX 3002 PCB ASSEMBLY (230V) Cont’d PLX 3002 PCB ASSEMBLY (230V) Cont’d Part Number Description Reference Part Number Description Reference RE-175002-30 RES SMT 7.5OK 1% l/lOW IOOV Rl20,132, RE-348702-30 RES 4a7K % ilaw 1 2 0 6 R321,322, Rl40,161 R326,32a RI 5j3ab RE-375005-BM RES MF 750K 2% 1/2W...

  • Page 53: Plx 3002 Chassis Assembly (230V)

    PLX 3002 CHASSIS ASSEMBLY (230V) Part Number Description Reference CH-000097-00 CHASSIS, PLX CH-000100-00 HANDLE-EAR CASTING PLX CH-000112-00 SHIELD, AC, PLX LB-000053-00 LBL, FRENCH, FUSE REPLACEMENT LB-000077-00 LABEL,WARNlNG,HlGH ENERGY LB-000099-01 LABEL, CE LISTING LB-00021 3-00 LABEL, FACEPLATE PLX 3002 LB-00021 5-00 LABEL, INPUT/OUTPUT, PLX LB-160226-01 LABEL, FUSE, UL CAUT.

  • Page 54: Plx Semiconductors

    PLX Series Semiconductor Identification DRIVER TRANSISTORS TMOS FET lRFZ44 2SC4793 NPN I2SAl837 PNP TMOS Power Field Effect Transistor ’ lRFZ4l G D S POWER TRANSISTORS OP-AMP NE5532AN 2SC3281 NPN I2SAl302 PNP Dual Operational Amplifier SMALL SIGNAL OP-AMP TRANSISTORS TL072 2N3904 NPN I2N3906 PNP...
  • Page 55 PLX Series Semiconductor Identification PWM Switch TIMER LM556CM TOP21 0 PWM MOSFET Gate Driver Dual Timer OP-AMP OP-AMP MC33078 LMI 3600 Dual Low Noise Operational Amplifier Dual Transconductance Operational Amplifier OPTO-ISOLATOR COMPARATOR Moc8lol LM311 Gallium Arsenide LED Coupled to Voltage Comparator...
  • Page 56 PLX Series Semiconductor Identification IGBT IGBT lRG4PC5OU lRG4PC4OU PLX2402, PLX3002 PLXI 202, PLXl602 insulated Gate Bipolar Transistor Insulated Gate Bipolar Transistor n-channel ‘2 HIGH/LOW SIDE DRIVER SG3525AN lR2110 Regulating Pulse Width Modulator High Speed MOSFET I IGBT Driver Logic supply Lcmic imul hiah side Lo&...

  • Page 57: Chassis Drawings

    - cCREW, #6-32 X 3/6* L., SEMS ,.“..ce,c RECQ SCREW, #8 X 5/16’L 7 3 REQD HANDLE-EAR 2 REDO KNOB J 2 REW FACEPLATE LABEL A - A CHASSIS ASSEMBLY H E X N U T (NW-3BOBO3-HN) P A R T O F 1/4- P H O N E J A C K O N ITEM 3 9 ( P C B A S S Y ) . 1.
  • Page 58 ----------- _-_-_-_-...
  • Page 60 smm, PLX MAIN MOOULE ASSEMBLY +6-20 Y 5/r I_ 1.w ’...

  • Page 61: Plx 1202 Main Pcb Schematics

    THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. INPUT FILTER INPUT FILTER THERMAL POSITIVE THERMAL POSITIVE SENSING OUTPUTS SENSING...
  • Page 62 1 - CLIP LIM, CH-A INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A INPUT AND FILTER SECTION, CH A OF QSC AUDIO PRODUCTS, THAT MAY NOT 3 - 30 HZ LF, CH-A POS STEP DRIVER 4 - PAR INPUT LED...
  • Page 63 INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A INPUT AND FILTER SECTION, CH B 3 - 30 HZ LF, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT POS STEP DRIVER 4 - PAR INPUT LED BE DISCLOSED, REPRODUCED OR USED...
  • Page 64 THIS DOCUMENT CONTAINS PROPRIETARY DP-PAR-F INFORMATION WHICH IS THE PROPERTY SH 2 OF QSC AUDIO PRODUCTS, THAT MAY NOT +HI-RAIL BE DISCLOSED, REPRODUCED OR USED +15V WITHOUT EXPRESS WRITTEN CONSENT FROM N282 +11V QSC AUDIO PRODUCTS. DP-BR-F N289 ROUTE TO SPKR OUTPUT...
  • Page 65 THIS DOCUMENT CONTAINS PROPRIETARY QSC-COM, 30A, COIL 24V +18V +16V INFORMATION WHICH IS THE PROPERTY N394 MIN VOLT 18V, OK OF QSC AUDIO PRODUCTS, THAT MAY NOT N379 BE DISCLOSED, REPRODUCED OR USED MURS160T3 +VREF WITHOUT EXPRESS WRITTEN CONSENT FROM AC-SW...

  • Page 66: Plx 1602 Main Pcb Schematics

    THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF. DATE APPROVED / DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT PRODUCTION RELEASE PER ECO 3724 AC 6-26-98 TS 6/30/98 BE DISCLOSED, REPRODUCED OR USED REVISE PER ECO 3803 AC...
  • Page 67 1 - CLIP LIM, CH-A +HI-RAIL INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT INPUT AND FILTER SECTION, CH A 3 - 30 HZ LF, CH-A POS STEP DRIVER 4 - PAR INPUT LED...
  • Page 68 INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A INPUT AND FILTER SECTION, CH B 3 - 30 HZ LF, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT POS STEP DRIVER 4 - PAR INPUT LED BE DISCLOSED, REPRODUCED OR USED...
  • Page 69 INFORMATION WHICH IS THE PROPERTY SH 2 PLC-2: (sim to 1.4) 30.1K / 2.00K = 15.05 Vout/Vmon OF QSC AUDIO PRODUCTS, THAT MAY NOT PLC-3: (between 1.8, 2.0) 33.2K / 1.5K = 22.13 Vout/Vmon +HI-RAIL BE DISCLOSED, REPRODUCED OR USED...
  • Page 70 INFORMATION WHICH IS THE PROPERTY 750K, X-CAP DISCHARGE N394 MIN VOLT 18V, OK NTC NEXT TO RELAY TO MEET IEC STANDARD: OF QSC AUDIO PRODUCTS, THAT MAY NOT LOCATE DOWNSTREAM N379 BECAUSE X-CAP EXCEEDS 0.1UF BE DISCLOSED, REPRODUCED OR USED MUST DISCHARGE X-CAP TO...

  • Page 71: Plx 2402 Main Pcb Schematics

    THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. INPUT FILTER INPUT FILTER THERMAL POSITIVE THERMAL POSITIVE SENSING OUTPUTS SENSING...
  • Page 72 INFORMATION WHICH IS THE PROPERTY DIP SWITCH TABLE, 10-POS 1 - CLIP LIM, CH-A +HI-RAIL OF QSC AUDIO PRODUCTS, THAT MAY NOT 2 - LF FILT, CH-A BE DISCLOSED, REPRODUCED OR USED INPUT AND FILTER SECTION, CH A 3 - 30 HZ LF, CH-A...
  • Page 73 N169 N172 +HI-RAIL INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT INPUT AND FILTER SECTION, CH B 3 - 30 HZ LF, CH-A POS STEP DRIVER 47pF-50V-5% 4 - PAR INPUT LED...
  • Page 74 THIS DOCUMENT CONTAINS PROPRIETARY DP-PAR-F INFORMATION WHICH IS THE PROPERTY SH 2 OF QSC AUDIO PRODUCTS, THAT MAY NOT +HI-RAIL BE DISCLOSED, REPRODUCED OR USED +15V WITHOUT EXPRESS WRITTEN CONSENT FROM N282 +11V DP-BR-F QSC AUDIO PRODUCTS. N289 ROUTE TO SPKR OUTPUT...
  • Page 75 THIS DOCUMENT CONTAINS PROPRIETARY QSC-COM, 30A, COIL 24V +18V +16V INFORMATION WHICH IS THE PROPERTY N394 MIN VOLT 18V, OK OF QSC AUDIO PRODUCTS, THAT MAY NOT N379 BE DISCLOSED, REPRODUCED OR USED MURS160T3 PRI_HI +VREF WITHOUT EXPRESS WRITTEN CONSENT FROM...

  • Page 76: Plx 3002 Main Pcb Schematics

    REVISION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. POS STEP POS STEP INPUT FILTER INPUT FILTER THERMAL POSITIVE...

  • Page 77: Plx Series Pcb Circut Board Drawings

    INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A INPUT AND FILTER SECTION, CH A 3 - 30 HZ LF, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT POS STEP DRIVER 47pF-50V-5% 4 - PAR INPUT LED BE DISCLOSED, REPRODUCED OR USED...
  • Page 78 INFORMATION WHICH IS THE PROPERTY 2 - LF FILT, CH-A INPUT AND FILTER SECTION, CH B 3 - 30 HZ LF, CH-A OF QSC AUDIO PRODUCTS, THAT MAY NOT POS STEP DRIVER 47pF-50V-5% 4 - PAR INPUT LED BE DISCLOSED, REPRODUCED OR USED...
  • Page 79 INFORMATION WHICH IS THE PROPERTY SH 2 PLC-2: (sim to 1.4) 30.1K / 2.00K = 15.05 Vout/Vmon OF QSC AUDIO PRODUCTS, THAT MAY NOT PLC-3: (between 1.8, 2.0) 33.2K / 1.5K = 22.13 Vout/Vmon +HI-RAIL BE DISCLOSED, REPRODUCED OR USED...
  • Page 80 INFORMATION WHICH IS THE PROPERTY 750K, X-CAP DISCHARGE N394 MIN VOLT 18V, OK TO MEET IEC STANDARD: NTC NEXT TO RELAY OF QSC AUDIO PRODUCTS, THAT MAY NOT LOCATE DOWNSTREAM N379 BECAUSE X-CAP EXCEEDS 0.1UF BE DISCLOSED, REPRODUCED OR USED MUST DISCHARGE X-CAP TO...
  • 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...

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Plx 1202Plx 1602Plx 2402Plx 3002

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