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 number for each individual amplifier. For
example, a serial number of 0807xxxxx would indicate that the amplifier was
built in 08/2007, or August 2007. The date code is important for determining
whether an amplifier is subject to a service bulletin, covered by a warranty (in
the absence of original purchase records), etc.
The amplifier’s serial number can be found on a label on the rear panel. The
label also indicates the model number, power rating, 4Ω current draw, and the
AC mains voltage the amplifier was made for.
Certain design changes that the RMX amplifiers have undergone commenced
with a particular date code; for example, the RMX amplifiers with a date code
of 0406 or later conform to the European Union’s RoHS Directive and must be
serviced only with lead-free solder and soldering irons that are not contami-
nated with lead or other heavy metals covered by the directive.
1.1 Restriction of Hazardous Substances Directive (RoHS)
Since April 2006, all RMX Series amplifiers are manufactured to conform to the European Union’s RoHS Directive, which reduces the
amount of hazardous substances allowed in products for sale within its member nations. In electronic equipment such as audio power
amplifiers, this applies primarily to certain toxic heavy metals, such as lead, which may be present in electronic components, solder, and
other parts.
RoHS-compliant materials
When servicing RoHS-compliant amplifiers, it is important for the service technician to use only RoHS-compliant components and solder
(lead-free). All replacement parts provided by QSC for RoHS-compliant products are certified as RoHS compliant.
RoHS-compliant tools
Soldering irons and desoldering apparatus used on RoHS-compliant products must also not be contaminated by hazardous substances,
such as lead. Therefore, you cannot use the same soldering and desoldering tools for RoHS-compliant products and solder as you do for
non-compliant products and solder. You must either use separate soldering irons, desoldering tools and braid, etc., or at the very least
designate separate tips and braids and use only the appropriate ones. If you contaminate a tip or braid, even inadvertently, by using it on
a non-compliant product or solder, you should no longer use it with RoHS-compliant products or solder.
1.3 Service bulletins
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.
These service bulletins had been issued at the time this manual was printed:
• RMX0001, “Q205 Lead Stress” (RMX2450 only)
• RMX0002, “RMX Turn-on Delay” (all RMX models)
• RMX0003, “RMX2450 Turn-off Mute” (RMX2450)
• RMX0004, “RMX2450 AC Wire Routing” (RMX 2450)
• RMX0005, “RMX2450 AC Wire Replacement” (RMX2450)
• RMX0006, “RMX2450 IRFZ44N Field Effect Transistors (RMX2450)
Figure 1.1. The label displays two vital pieces of
information: the amplifier’s serial number and
operating voltage
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