QSC RMX 850 Technical & Service Manual
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QSC RMX 850 Technical & Service Manual

Rmx series
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RMX™ Series
L L L L L
RMX 850
L L L L L
RMX 1450
L L L L L
RMX 2450
*TD-000098-00*
TD-000098-00
Rev. B

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Summary of Contents for QSC RMX 850

  • Page 1 RMX™ Series L L L L L RMX 850 L L L L L RMX 1450 L L L L L RMX 2450 *TD-000098-00* TD-000098-00 Rev. B...
  • Page 3 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 2001, 2002 QSC Audio Products, Inc. All rights reserved. Document # TD-000098-00, Rev. B. Released February 2002. RMX Series Technical Service Manual...

  • Page 4: Rmx Series Performance Specifications

    4 Ω Ω Ω Ω Ω 4 Ω Ω Ω Ω Ω 2 Ω Ω Ω Ω Ω 2 Ω Ω Ω Ω Ω 2 Ω Ω Ω Ω Ω US patents pending SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE QSC Audio Products, Inc.

  • Page 5: Table Of Contents

    7.1 RMX Assembly/Disassembly Diagram 1 of 2 (All models) ....................... 27 7.2 RMX Assembly/Disassembly Diagram 2 of 2 (All models) ....................... 28 7.3 RMX 850 Schematic Diagram 1 of 3 Channel 1 ..........................29 7.4 RMX 850 Schematic Diagram 2 of 3 Channel 2 ..........................30 7.5 RMX 850 Schematic Diagram 3 of 3 Power Supply .........................

  • Page 6: Introduction

    Contact QSC Technical Services to make sure you have the most up-to-date service bulletins for RMX 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 7 Insertion 1 With a soldering iron and 60/40 or 63/37 eutectic-type solder, melt just enough solder onto one pad to Solder create a small mound (Figure 1.3). 2 Grasp the component in the middle with tweezers. Melt the small mound of solder with the iron and place the component across the two pads (in the correct orientation, if the component is sensitive to Figure 1.3.

  • Page 8: Series Description

    The series comprises three models: the RMX 850, RMX Audio circuitry 1450, and RMX 2450. Each one has two audio channels and is two rack spaces tall.

  • Page 9: Clip Detection

    DC fault. collectors all connect to ground, which allows them to be mounted The output sections of the RMX 850 and RMX 1450 are AC coupled. directly to the heat sink—metal-to-metal, without insulators in between—for the best possible transfer of heat away from the Class H transistors.

  • Page 10: Component Identification And Pinout

    OUTPUT B LM311 Voltage comparator BUFFER INPUT A BUFFER INPUT B GROUND 1 BUFFER OUTPUT A BUFFER OUTPUT B NON-INVERTING OUTPUT INPUT INVERTING BALANCE/ INPUT STROBE BALANCE 2N5064 Sensitive gate thyristor 4N29 Opto-isolator K A G QSC Audio Products, Inc.
  • Page 11 2N3904 (NPN) and 2N3906 (PNP) Small-signal IRFZ44 TMOS power field effect transistor transistors B C E MAC224 Triac 2SC5200 (PNP) and 2SA1943 (NPN) Power transistors MJE15032 (NPN) and MJE15033 (PNP) Driver transistors TOSHIBA B C E RMX Series Technical Service Manual...

  • Page 12: Troubleshooting: Symptoms, Causes, & Remedies

    • Individual supply clamp diodes D117, D118, D217, or D218 is No clip limiting reversed or shorted. • U10 is defective. • Bias diodes D108, D109, D208, or D209 or bias trimpots R131 or • DIP switches SW1:1 or SW1:10 is defective. R231 is open. QSC Audio Products, Inc.

  • Page 13: Faults With Signal Present

    • Base resistors R136 or R137 (Channel 1) or R236 or R237 D216 (Channel 2). (Channel 2) are open. Also check the NTC thermistors R134 • (RMX 850 and RMX 1450) Check R118 and R119 (Channel 1) or (Channel 1) or R234 (Channel 2). R218 and R219 (Channel 2).

  • Page 14: Power Supply & Rail Balancing Problems

    “on” at idle so that the transitions of the signal voltage between R231) and the voltage measuring points so you can work quickly but positive and negative are smooth and free of gaps or glitches. Too thoroughly. If the amplifier warms up before you finish setting the QSC Audio Products, Inc.

  • Page 15: Setting Positive And Negative Current Limits

    bias, you will need to shut the amplifier off and let it cool down onto one of the brown wires running to the AC switch or onto before you resume. the gray output wire from channel 1's module. Turn the gain control all the way up. Adjust trimpots R139 and Tools and resources you will need: R140 equally until the current measured falls within the range •...

  • Page 16: Servicing Rmx 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 RMX 850 and RMX 1450, which have single-side printed circuit boards. The RMX 2450 has double-side boards; many of the through-hole components on the upper side of the board can be unsoldered and soldered from the top side of the board, so removing modules or boards is not always necessary.

  • Page 17: Replacement Parts

    6. Replacement parts 6.1 RMX 850 Replacement Parts QSC part # Description Qty. Notes or Component Reference Misc. 1806-2505-0 POWER TRANSFORMER 700 2113-1144-0 AC INLET 2444-1001-1 KNOB CONTROL 4134-8432-0 RACK-MOUNT BRACKET 5200-4717-0 ROCKER POWER SWITCH 5200-3532-0 CIRCUIT BREAKER 10A For 120V models...
  • Page 18 R260 4804-0040-1 DIODE IN4004 AL D10, D13, D217, D218 4804-9340-2 DIODE IN4934 AT D208, D209 4837-5B10-2 DZ 1/2W 5.5-5.8V AT D207, D210 4838-15V6-2 DZ 1W 15V AT TEMIC D100, D101, D200, D201 4860-5020-5 TR MJE15032 Q205 QSC Audio Products, Inc.
  • Page 19 Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference 4860-5030-5 TR MJE15033 Q206 4860-5050-5 TR 2SC5200 T0-3P (L) Q208, Q210, Q212 4860-5060-5 TR 2SA1943 T0-3P (L) Q203, Q207, Q209 8910-0062-0 CE 80V 4700U 20% RL 25X...

  • Page 20: Rmx 1450 Replacement Parts

    4860-5030-5 TR MJE15033 Q106 4860-5050-5 TR 2SC5200 T0-3P (L) Q104, Q108, Q110, Q112 4860-5060-5 TR 2SA1943 T0-3P (L) Q103, Q107, Q109, Q111 4860-8890-0 TR MPS A06 VCE 80V NS 8910-0272-0 CE 100V 3300u 20% 25X50 C120–C123 QSC Audio Products, Inc.
  • Page 21 Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference 8910-0274-0 THERMAL PTC 60C 100 ohm 8910-0488-0 ROD THERMISTOR NTC 50ohm R134 Channel 1 SMT parts 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 C115 150H-102J-6-CF CC 100V 0.001U 5% 1206...
  • Page 22 26 PIN IEC RIBBON CABLE PCB-QZ020C-OUT Output Board 2113-1336-1 SPEAKON NEUTRIK 4 WIRE J100, J200 2113-1338-0 4-POLE SPEAKER TERMINAL J103 4154-2111-0 OUTPUT POST PLUG FOR CE For European models only 4154-2121-0 OUTPUT POST PLUG FOR CE For European models only QSC Audio Products, Inc.

  • Page 23: Rmx 2450 Replacement Parts

    6.3 RMX 2450 Replacement Parts QSC part # Description Qty. Notes or Component Reference Misc. 1806-2507-0 POWER TRANSFORMER, 1800 2113-1144-0 AC INLET 4134-9101-0 METAL WIND GUIDE 4154-0361-0 FAN GUIDE 5200-4717-0 ROCKER POWER SWITCH 5200-3531-0 CIRCUIT BREAKER 15A For 120V models...
  • Page 24 R113, R196, R213, R296 4720-3011-J RMG 1/10W 3.01K 1% 0805 R24, R175 4720-391J-J RMG 1/10W 390R 5% 0805 R120, R220 4720-393J-J RMG 1/10W 39K 5% 0805 R107, R207 4720-470J-J RMG 1/10W 47R 5% 0805 R170, R189 QSC Audio Products, Inc.
  • Page 25 Channel 1 module (continued) QSC part # Description Qty. Notes or Component Reference 4720-472J-J RMG 1/10W 4.7K 5% 0805 R114, R138, R174, R179, R187, R193, R214, R238 4720-473J-J RMG 1/10W 47K 5% 0805 R183 4720-474J-J RMG 1/10W 470K 5% 0805...
  • Page 26 26 PIN IEC RIBBON CABLE PCB-QZ030C-OUT Output Board 2113-1336-1 SPEAKON NEUTRIK 4 WIRE J100, J200 2113-1338-0 4-POLE SPEAKER TERMINAL J103 4154-2111-0 OUTPUT POST PLUG FOR CE For European models only 4154-2121-0 OUTPUT POST PLUG FOR CE For European models only QSC Audio Products, Inc.

  • Page 27: Schematics And Diagrams

    REVISIONS 7. Schematics and diagrams INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF DATE CHK APPROVED DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. SCREW 4 REQD PWR PCB...

  • Page 28: Rmx Assembly/Disassembly Diagram 2 Of 2 (All Models)

    OF QSC AUDIO PRODUCTS, THAT MAY NOT CHANNEL MODULES BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. RMX 850: PCB-QZ010C-PWR1 (left or Channel 1) RMX 1450: PCB-QZ020C-PWR1 (left or Channel 1) RMX 2450: PCB-QZ030C-PWR1 (left or Channel 2) SCREW 5 REQD...

  • Page 29: Rmx 850 Schematic Diagram 1 Of 3 Channel 1

    PARTS IN COMMON TO BOTH CH: 1-99. CH 1 PARTS 101-199, CH 2 PARTS 201-299. APPROVALS DATE SCHEMATIC DIAGRAM .XXX 7.3 RMX 850 Schematic Diagram 1 of 3 DRAWN 3. COMPONENTS MARKED WITH ARE SAFETY CRITICAL PARTS. DEBURR EDGES .XXX R MAX...

  • Page 30: Rmx 850 Schematic Diagram 2 Of 3 Channel 2

    SW-GND FOR CLIP LIM 10.0K-1%-1/2W ^R_0805 SEE SH 1 BR_RET BR MONO RETURN -- CAUTION, SENSITIVE NODE Gray shading indicates signal path 7.4 RMX 850 Schematic Diagram 2 of 3 Channel 2 SIZE FSCM NO. DWG NO. SH-000850-00 NOTES: UNLESS OTHERWISE SPECIFIED SCALE CAD FILE NO.

  • Page 31: Rmx 850 Schematic Diagram 3 Of 3 Power Supply

    J157:1 200V-1A JP10 NEUT 20 VAC TO FAN POWER RECTIFIER 28V PRI-SIDE DC FAN SUPPLY 1.1 AMP 1000-35V 7.5 RMX 850 Schematic Diagram 3 of 3 Power Supply SIZE FSCM NO. DWG NO. SH-000850-00 NOTES: UNLESS OTHERWISE SPECIFIED SCALE CAD FILE NO.

  • Page 32: Rmx 1450 Schematic Diagram 1 Of 3 Channel 1

    REVISION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF. DATE APPROVED / DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED PROTOTYPE RELEASE 3-01-00 WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. CLEAN UP BY PHQ...

  • Page 33: Rmx 1450 Schematic Diagram 2 Of 3 Channel 2

    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. CHANNEL-2 C201 180p-5% ^C_0805 R205 R228 R229 Q201 +VCC_B R235 +78V...

  • Page 34: Rmx 1450 Schematic Diagram 3 Of 3 Power Supply

    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. RECTIFIERS BR100, 200 AND C127-227 ARE MUTING AND THERMAL PROTECTION. LOCATED OFF THE MAIN PCB, MOUNTED TO CHASSIS.

  • Page 35: Rmx 2450 Schematic Diagram 1 Of 3 Channel 1

    POS STEP DRIVER THIS DOCUMENT CONTAINS PROPRIETARY +110_A INFORMATION WHICH IS THE PROPERTY C170 OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED 47pF-50V-5% WITHOUT EXPRESS WRITTEN CONSENT FROM Q170 ^Q_BJTN_SOT-23 R170 QSC AUDIO PRODUCTS. ^C_0805 RFZ44...

  • Page 36: Rmx 2450 Schematic Diagram 2 Of 3 Channel 2

    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 DRIVER +110_B C270 47pF-50V-5% Q270 ^Q_BJTN_SOT-23 R270 ^C_0805 RFZ44...

  • Page 37: Rmx 2450 Schematic Diagram 3 Of 3 Power Supply

    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. CT_A SEE SH 1 J104:12 J21:1 RECTIFIER BR100-201 CIRCUIT +14V MUTING AND THERMAL PROTECTION.

  • Page 38: Rmx 850 Chassis Wiring Diagram

    THIS DOCUMENT CONTAINS PROPRIETARY REVISIONS INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF. DATE APPROVED/DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED OUTPUT PCB WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. 1724-340C-0102 J103 E100 JP14...

  • Page 39: Rmx 1450 Chassis Wiring Diagram

    THIS DOCUMENT CONTAINS PROPRIETARY REVISIONS INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF. DATE APPROVED/DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED OUTPUT PCB WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. 1724-340C-0102 J103 E100 JP14...

  • Page 40: Rmx 2450 Chassis Wiring Diagram

    THIS DOCUMENT CONTAINS PROPRIETARY REVISIONS INFORMATION WHICH IS THE PROPERTY DESCRIPTION EFF. DATE APPROVED/DATE OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED OUTPUT PCB PRODUCTION RELEASE PER ECO X MP WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS.
  • Page 42 “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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