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TD-001517-01
K.2 Series Service Manual
1. Introduction
1.1 Restriction of Hazardous Substances Directive (RoHS)
QSC K.2 Series powered loudspeakers are manufactured to conform to the European Union’s RoHS Directive, which reduc-
es the amount of hazardous substances allowed in products for sale within its member nations. In electronic equipment
such as audio processors, this applies primarily to certain toxic heavy metals, such as lead, which may be present in elec-
tronic components, solder, and other parts.
RoHS-compliant materials
When servicing RoHS-compliant electronic products, 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 contami-
nate 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.
1.2 Revision history
No revision history yet. First revision released March 2018.
1.3 Service manual contents
Starting late 2017, QSC changed the key contents inside the Service Manual. Because hardware or software may under-
go several changes during the life of this product, schematic diagrams, PCB images, and full BOM are not available in this
service manual. This new structure will reduce the overall page count and number of revisions, making the service manual
easier to navigate.
Please download these supplemental documents from the Service Partner Portal at www.qsc.com/login (registration and
login are required) or contact QSC for them. The Service Partner Portal is always up-to-date with the latest information and
service documents.
1.4 Service bulletins
At the publish date of this service manual, two service bulletins concerning the K.2 Series have been issued. Check the
QSC Service Partner Portal or contact QSC Technical Services Group (TSG) for the latest information on applicable service
documents.
These service bulletins apply to K.2 series loudspeakers that should be noted:
• K2-001: No power. Applies to K8.2, K10.2, and K12.2 with serial date code VAHxxxxxx - VHHxxxxxx / GAHxxxxxx - GH-
Hxxxxxx. A very small percentage of K.2 powered loudspeakers built before September 2017 may not power up, either
when first turning on the speaker or after some use. The speaker could fail quietly or make a popping sound. After the
failure occurs, the amplifier module, which is located on the back of the speaker, is completely non-functional.
• K2-002: No audio coming out of standby / chirping sounds. Applies to K8.2, K10.2, and K12.2 with serial date code
VAHxxxxxx - VIHxxxxxx / GAHxxxxxx - GIHxxxxxx. A very low percentage of K.2 powered loudspeakers could experience
symptoms of no audio while coming out of standby, no audio after being turned on, or random chirping/buzzing sounds.
The issue is more susceptible to high amplifier module temperatures and AC input voltages in the range of 125▲V -
140▲V or 250▲V to 280▲V.
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