Service Bulletin
Contents
1. Service Bulletin Title RMX Series Gain Modification Bulletin RMX0007 Issue Date April 11 2003 Models Affected RMX Series Bulletin Revision A A_U_ OD _ e Description This instruction describes the procedure for modifying the RMX Series amplifier circuitry to obtain 26dB gain for Meyer Sound Systems Instructions Tools required Soldering iron with fine tip recommended range 25 to 60 W Desoldering station Rosin core solder 63 37 eutectic type recommended and flux 2 Philips screwdrivers Small boxes or compartments to keep assorted screws during disassembly Small diagonal cutters DOOOOD Parts required Model CH1 R105 R106 CH2 R205 R206 RMX850 6 34k RMX1450 4 99k RMX1850HD 4 42k RMX2450 4 02k Note A I four SMT resistors are 1 10 watt 1 tolerance and type 805 Table 1 Installation procedure 1 Disconnect the amplifier from AC and wait at least 10 minutes for internal voltages to bleed down 2 Remove the top cover of the chassis 3 Remove the right main PCB assembly from the chassis and turn it upside down Refer to RMX Technical Service Manual for assembly aid if needed 4 If your amplifier is RMX850 or RMX1450 model use Figure 1 to locate R105 R106 for channel 1 and R205 R206 for channel 2 If your amplifier is RMX1850HD or RMX2450 use Figure 2 instead Replace them with matching resistors for the desired RMX model See Table 1 5 Reinstall the right2. main PCB assembly into the chassis 6 Make sure there are no foreign objects in the 0 S amplifier Hook up the amplifier output s toa RMX850 3 load the inputs to an audio source and the i power cord to AC power Turn the amp on and F nd RMX1450 k s Figure 1 make sure it passes audio on both channels with no problems T Re install the top cover Contact information ye ee x Nie N oy 3 SZ X AA s i d z z 3 oain FEANN i F ae NSS ADA 4 G 2 y m gt ps A a gt z PRAA me ER La ES o oe oY Aa Oi n ty iO teak i gt De ee od T parts Ae a RST FEAN FON 4 we e a gt va Pa he P o O gt ZRA ae e A 7 a eN Rn A oa 47 ee er ore Hn Yuet amp o A 4 SA oad e gt Pee X1850 and RMX2450 ts aoe te vi Al EN Ab polis io s 33 eee a Se z a E Ce aS lt 4 rat ase e T r Ks rs 7 K So ae R EWE e Ss gt tei g Figure 2 If you need any further information regarding this service procedure please contact QSC Technical Services at the addresses or numbers below Telephone 1 800 772 2834 within USA only 1 714 957 7150 Fax 1 714 754 6173 E mail tech _support qscaudio com Web Site www qscaudio com product info support www qscstore com on line accessory and replacement component sales Postal and parcel address QSC Audio Products Inc Technical Services Group 1665 MacArthur Blvd Costa Me
3. sa CA 92626 USA
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