1. DL manuals
  2. QSC
  3. Amplifier
  4. RMX Series
  5. Technical & Service Manual

QSC RMX Series Technical & Service Manual

Summary of RMX Series

  • Page 1

    Technical ser vice manual rmx™ series 2ru models ▲ ▲ ▲ ▲ ▲ rmx 850 ▲ ▲ ▲ ▲ ▲ rmx 1450 ▲ ▲ ▲ ▲ ▲ rmx 1850hd ▲ ▲ ▲ ▲ ▲ rmx 2450 *td-000098-00* td-000098-00 rev. C qsc audio products, llc costa mesa, ca 92626 usa www.Qscaudio.Com.

  • Page 3: Rmx 850

    Rmx series technical service manual (2ru models) 1 td-000098-00 rev. C 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 postal: 1665 macarthur blvd. Costa mesa, california 92626 usa e-mail: tech_support@qscaudi...

  • Page 4

    2 qsc audio products, llc rmx 850 rmx 1450 rmx 1850hd rmx 2450 output power in watts ftc: 20 hz–20 khz @ 0.1% thd, both channels driven 8 Ω per channel 185 260 350 450 4 Ω per channel 280 400 550 650 eia: 1 khz @ 0.1% thd, both channels driven 8 Ω per channel 200 280 360 500 4 Ω per channel 300 450 ...

  • Page 5: Table of Contents

    Rmx series technical service manual (2ru models) 3 td-000098-00 rev. C table of contents rmx series performance specifications ...................................................................................................................................................... 2 1. Introduction .......

  • Page 6

    4 qsc audio products, llc 7.13 rmx 2450 schematic diagram 2 of 4 channel 2 ................................................................................................................................................................................................... 45 7.14 rmx 2450 schematic di...

  • Page 7: 1. Introduction

    Rmx series technical service manual (2ru models) 5 td-000098-00 rev. C 1. Introduction 1.2 qsc serial numbers serial numbers on qsc rmx series amplifiers are nine digits long. The first four digits are a manufacturing date code in mmyy format; the last five digits are the sequential identifying numb...

  • Page 8

    6 qsc audio products, llc solder 1.4 the well-equipped service bench to properly service rmx amplifiers, a technician needs the right tools. The technician’s service bench should have the following equipment: • digital multimeter with rms ac voltage and current • digital clamp-on ammeter • dual-trac...

  • Page 9

    Rmx series technical service manual (2ru models) 7 td-000098-00 rev. C solder tweezers solder insertion 1 with a soldering iron and appropriate solder, melt just enough solder onto one pad to create a small mound (figure 1.5). 2 grasp the component in the middle with tweezers. Melt the small mound o...

  • Page 10: 1.6 Series Description

    8 qsc audio products, llc +vcc -vcc +vcc -vcc channel 1 channel 2 +110v -110v +55v -55v channel 1 ch. 1 center tap to channel 2 center tap 12 5w ×2 Ω 0.047 µf note: some of these descriptions concern circuitry that is duplicated in the amplifier’s two channels. For the sake of simplicity, the descri...

  • Page 11

    Rmx series technical service manual (2ru models) 9 td-000098-00 rev. C the arrangement of the output transistors might look somewhat backwards: pnp transistors connected to the positive voltage rail, and npn on the negative rail. Not only that, but the transistors attached to the positive rail are f...

  • Page 12

    10 qsc audio products, llc dc protection the rmx1850hd and rmx2450 have a crowbar circuit, based on a triac and two silicon controlled rectifiers, on the output to protect against dc faults. If an amp channel puts out a dc voltage, which could be the result of a component or circuit failure, it will...

  • Page 13

    Rmx series technical service manual 11 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/ strobe balance v+ ...

  • Page 14

    12 qsc audio products, llc b c e toshiba b c e mje15032 (npn) driver transistor (part number qd-000207-gp; was 4860-5020-5) mje15033 (pnp) driver transistor (part number qd-000210-gp; was 4860-5030-5) 2sc5200 (pnp) power transistor (part number qd-000209-gp; was 4860-5050-5) 2sa1943 (npn) power tran...

  • Page 15: 3. Troubleshooting:

    Rmx series technical service manual 13 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’s behavior and it...

  • Page 16: 3.4 Instability

    14 qsc audio products, llc the amplifier will not thermally shut down when it over- heats check for shorted d9, r4, or r7; check also for open ld1 (“power” led), r2, or r5. 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...

  • Page 17: 3.5 Power Supply And Rail

    Rmx series technical service manual 15 c116 (channel 1) or c214, c215, and c216 (channel 2). • moderate distortion, especially with light loading: stability capacitors c124 and c126 (channel 1) or c224 and c226 is too high in capacitance; also check the slew rate capacitors c114, c115, and c116 (cha...

  • Page 18: 4.1 Setting Bias

    16 qsc audio products, llc 4.1 setting bias always set the bias • after replacing any output or driver transistor. • after replacing any diode or resistor in the driver/output circuitry. • if the amplifier seems to run too hot at idle. • if the amplifier exhibits crossover distortion. The bias netwo...

  • Page 19

    Rmx series technical service manual 17 calibrations adjust rmx850 rmx1450 rmx1850hd rmx2450 channel 1 bias: dc voltage across r146 r131 0.16 v 0.14 v 0.07 v 0.07 v channel 2 bias: dc voltage across r246 r231 0.16 v 0.14 v 0.07 v 0.07 v output current into shorted load channel 1: r139 & r140 channel ...

  • Page 20: Re-Assembly

    18 qsc audio products, llc 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 rmx850 and rmx1450, which have single-side printed circuit boards. The rmx2450 has double-side bo...

  • Page 21: 6. Replacement Parts

    Rmx series technical service manual (2ru models) 19 td-000098-00 rev. C 6. Replacement parts 6.1 rmx850 replacement parts qsc part # old qsc part # description qty. Notes or component reference misc. Ch-000198-gp 4134-8432-0 rack-mount bracket 2 co-000211-gp 2113-1144-0 ac inlet, 250v 15a 1 ms-00013...

  • Page 22

    20 qsc audio products, llc re-000260-gp 8910-0274-0 thermal ptc 60c 100 ohm 1 r7 re-001201-gp 471b-120j-1-x 12 5% 5w metal oxide film 2 r161, r162 re-002202-gp 4718-220j-2-p rmf 1w 22r 5% at fp 2 r136, r137 re-082005-gp 471b-821j-1-x rmf 5w 820 ohm 5% al metal 2 r157, r158 re-120007-gp 471b-202j-1-x...

  • Page 23

    Rmx series technical service manual (2ru models) 21 td-000098-00 rev. C re-002202-gp 4718-220j-2-p rmf 1w 22 5% at fp 2 r236, r237 re-082005-gp 471b-821j-1-x rmf 5w 820 ohm 5% al metal 2 r257, r258 re-120007-gp 471b-202j-1-x rmf 5w 2k 5% al metal 2 r233, r235 re-122006-gp 4756-2226-3-06 svr 2.2k h3 ...

  • Page 24

    22 qsc audio products, llc 6.2 rmx1450 replacement parts qsc part # old qsc part # description qty. Notes or component reference misc. Ch-000194-gp 4134-9101-0 fan shroud rmx 1 co-000211-gp 2113-1144-0 ac inlet 250v 15a 1 ms-000137-gp 4154-0361-0 fan guard wire 76mm rmx 1 ms-000138-gp 8900-9050-1 dc...

  • Page 25

    Rmx series technical service manual (2ru models) 23 td-000098-00 rev. C re-130003-gp 471b-302j-1-x rmf 5w 3k 5% metal 2 r133, r135 re-215006-gp 4719-153j-1-x rmf 2w 15k 5% al metal 2 r2, r5 xf-000190-gp 1804-1040-0 spring coil 2uh (14ga wire) 1 l100 channel 1 smt parts ca-210011-gp 150h-102j-6-cf cc...

  • Page 26

    24 qsc audio products, llc re-213304-gp 4717-1332-2 rmf 1/2w 13.3k 1% at 2 r122, r222 xf-000190-gp 1804-1040-0 spring coil 2uh (14ga wire) 1 l200 channel 2 smt parts ca-056001-gp 150f-560k-j-bd cc 50v 56pf 10% 0805 2 c110, c210 ca-056002-gp 15cg-560j-6-cf ctc 0/30 56p 5% 1206 2 c111, c211 ca-118000-...

  • Page 27

    Rmx series technical service manual (2ru models) 25 td-000098-00 rev. C 6.3 rmx1850hd replacement parts qsc part # old qsc part # description qty. Notes or component reference misc. Ch-000194-gp 4134-9101-0 fan shroud rmx 1 co-000211-gp 2113-1144-0 ac inlet 250v 15a 1 ms-000137-gp 4154-0361-0 fan gu...

  • Page 28

    26 qsc audio products, llc qd-000202-gp 4804-0040-1 diode in4004 al 4 d10, d12, d117, d118 qd-000203-gp 4838-15v6-2 diod znr 15v 1w silicon epit 4 d100, d101, d200, d201 qd-000206-gp 4804-9340-2 diod rect fast, in4934 at 2 d108, d109 qd-000207-gp 4860-5020-5 xistor npn 250v 0.5a mje15032 1 q105 qd-0...

  • Page 29

    Rmx series technical service manual (2ru models) 27 td-000098-00 rev. C re-120004-gp 4720-202j-j rmg 1/10w 2k 1% 0805 2 r190, r195 re-122007-gp 4720-222j-j rmg 1/10w 2.2k 5% 0805 1 r191 re-130103-gp 4720-3011-j rmg 1/10w 3.01k 1% 0805 2 r24, r175 re-147001-gp 4720-472j-j rmg 1/10w 4.7k 5% 0805 8 r11...

  • Page 30

    28 qsc audio products, llc re-001201-gp 471b-120j-1-x 12 5% 5w metal oxide film 4 r254, r255, r261, r262 re-002202-gp 4718-220j-2-p rmf 1w 22 5% at fp 2 r236, r237 re-001005-gp 4715-100j-2 rmf 1/4w 10 ohm 5% 1 r263 re-010008-gp 4715-101j-2 rmf 1/4w 100 ohm 5% 1 r264 re-122006-gp 4756-2226-3-06 svr 2...

  • Page 31

    Rmx series technical service manual (2ru models) 29 td-000098-00 rev. C 6.4 rmx2450 replacement parts qsc part # old qsc part # description qty. Notes or component reference misc. Co-000211-gp 2113-1144-0 iec power inlet 1 ch-000194-gp 4134-9101-0 metal wind guide 1 ms-000137-gp 4154-0361-0 fan guid...

  • Page 32

    30 qsc audio products, llc qd-000202-gp 4804-0040-1 diode in4004 al 4 d10, d12, d117, d118 qd-000203-gp 4838-15v6-2 diod znr 15v 1w silicon epit 4 d100, d101, d200, d201 qd-000206-gp 4804-9340-2 diod rect fast, in4934 at 2 d108, d109 qd-000207-gp 4860-5020-5 xistor npn 250v 0.5a mje15032 1 q105 qd-0...

  • Page 33

    Rmx series technical service manual (2ru models) 31 td-000098-00 rev. C re-122007-gp 4720-222j-j rmg 1/10w 2.2k 5% 0805 1 r191 re-130103-gp 4720-3011-j rmg 1/10w 3.01k 1% 0805 2 r24, r175 re-147001-gp 4720-472j-j rmg 1/10w 4.7k 5% 0805 8 r114, r138, r174, r179, r187, r193, r214, r238 re-159003-gp 47...

  • Page 34

    32 qsc audio products, llc *qd-000211-gp *4860-8890-0 tr mps a06vce 80v ns 1 q5 (december 2001 and earlier) *qd-000212-gp *4837-5b10-2 diode zener 1/2w 5.5-5.8v 2 d207, d210 (december 2003 and earlier) qd-000215-gp 4840-2190-0 diode mur1520 15a 200v 2 d275, d276 qd-000218-gp 4837-3b20-2 diod znr 3.8...

  • Page 35: 7. Schematics and Diagrams

    Rmx series technical service manual (2ru models) 33 td-000098-00 rev. C dwg no. P a-002450-00 1 sh rev 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 a b c d a b c d this document contains proprietary information which is the property of qsc audio products, that may not be disclosed, reproduced or used without exp...

  • Page 36

    34 qsc audio products, llc chassis screw 4 reqd wire assy nut screw 5 reqd screw 6 reqd knob 2 reqd d scale 1/2 sheet 2 of 2 dwg no. Pa-002450-00 rev dwg no. P a-002450-00 2 sh rev 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 a b c d a b c d this document contains proprietary information which is the property of...

  • Page 37

    Rmx series technical service manual (2ru models) 35 td-000098-00 rev. C gray shading indicates signal path r114: 4.7k (up to apr 2002) 1.2k (effective may 2002) r127: 100 (up to feb 2002) 75 (effective mar 2002) Ω Ω r120: 270 (up to apr 2002) 230 (may–july 2002) Ω Ω 232 (effective august 2002) Ω d10...

  • Page 38

    36 qsc audio products, llc gray shading indicates signal path d207: 5.6v 0.25w (up to feb 2002) 4.7v 0.25w (mar 2002–may 2003) 5.1v 0.25w (effective june 2003) d210: 5.6v 0.25w (up to feb 2002) 4.7v 0.25w (mar 2002–may 2003) 5.1v 0.25w (effective june 2003) r214: 4.7k (up to apr 2002) 1.2k (effectiv...

  • Page 39

    Rmx series technical service manual (2ru models) 37 td-000098-00 rev. C 7.5 rmx850 schematic diagram 3 of 3 power supply.

  • Page 40

    38 qsc audio products, llc gray shading indicates signal path r114: 4.7k (up to apr 2002) 1.2k (effective may 2002) r116: 499k (up to apr 2002) 560k (effective may 2002) r112: 10k linear (up to apr 2002) 2.5k linear (effective may 2002) right angle pot d108: 1n4934 (up to feb 2002) 1n4004 (effective...

  • Page 41

    Rmx series technical service manual (2ru models) 39 td-000098-00 rev. C d208: 1n4934 (up to feb 2002) 1n4004 (effective mar 2002) d207: 5.6v 0.25w (up to feb 2002) 4.7v 0.25w (mar 2002–may 2003) 5.1v 0.25w (effective june 2003) d210: 5.6v 0.25w (up to feb 2002) 4.7v 0.25w (mar 2002–may 2003) 5.1v 0....

  • Page 42

    40 qsc audio products, llc 7.8 rmx1450 schematic diagram 3 of 3 power supply.

  • Page 43

    Rmx series technical service manual (2ru models) 41 td-000098-00 rev. C gray shading indicates signal path 7.9 rmx1850hd schematic diagram 1 of 3 channel 1.

  • Page 44

    42 qsc audio products, llc gray shading indicates signal path 7.10 rmx1850hd schematic diagram 2 of 3 channel 2.

  • Page 45

    Rmx series technical service manual (2ru models) 43 td-000098-00 rev. C 7.11 rmx1850hd schematic diagram 3 of 3 power supply.

  • Page 46

    44 qsc audio products, llc gray shading indicates signal path r114: 4.7k (up to apr 2002) 1.2k (effective may 2002) r127: 100 (up to feb 2002) 75 (effective mar 2002) Ω Ω r120: 390 (up to apr 2002) 348 (effective may 2002) Ω Ω d110: 5.6v 0.25w (up to feb 2002) 4.7v 0.25w (effective mar 2002) d107: 5...

  • Page 47

    Rmx series technical service manual (2ru models) 45 td-000098-00 rev. C gray shading indicates signal path r214: 4.7k (up to apr 2002) 1.2k (effective may 2002) r227: 100 (up to feb 2002) 75 (effective mar 2002) Ω Ω r220: 390 (up to apr 2002) 348 (effective may 2002) Ω Ω d210: 5.6v 0.25w (up to feb ...

  • Page 48

    46 qsc audio products, llc ! ! ! ! Notes: unless otherwise specified a b 8 7 6 5 8 6 7 5 c d 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. C d 1 4 3 2 ...

  • Page 49

    Rmx series technical service manual (2ru models) 47 td-000098-00 rev. C 7.15 rmx2450 schematic diagram 4 of 4 power supply revision.

  • Page 50

    48 qsc audio products, llc 7.16 rmx power transformer configurations march 2007 and later.

  • Page 51

    Rmx series technical service manual (2ru models) 49 td-000098-00 rev. C ch 1 spkr output ch 2 spkr output ch 1 spkr common ch 2 spkr common j103 j203 output pcb 1724-340c-0102 jp14 jp13 jp15 jp16 red blk wiring diagram, rmx 850 audio products, inc. Costa mesa, california scale none rev a sheet 1 of ...

  • Page 52

    50 qsc audio products, llc ch 1 spkr output ch 2 spkr output ch 1 spkr common ch 2 spkr common j103 j203 output pcb 1724-340c-0102 jp14 jp13 jp15 jp16 red blk wiring diagram, rmx 1450 audio products, inc. Costa mesa, california scale none rev a sheet 1 of 1 notes: unless otherwise specified rev desc...

  • Page 53

    Rmx series technical service manual (2ru models) 51 td-000098-00 rev. C ch 1 spkr output ch 2 spkr output ch 1 spkr common ch 2 spkr common j103 j203 output pcb 1724-342a-0102 jp14 jp13 jp15 jp16 red 5 red 4 blk 3 blk 2 blk 1 fg-002450-00 rmx 2450 next assy used on first application unless otherwise...

  • Page 54

    52 qsc audio products, llc.

  • Page 56

    “qsc” and the qsc logo are registered trademarks of qsc audio products, llc 1665 macarthur blvd. Costa mesa, ca 92626 phone +1 (714) 957-7150 (800) 772-2834 (usa only) fax +1 (714)754-6173 www.Qscaudio.Com.