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TD-000487-00
K Series Service Manual
10. Service updates
10.1 Inductor reinforcement, L13
Please read QSC service bulletin KSE0001 for more information regarding the inductor reinforcement. New K-series models
have changed L13 to a 6-pin inductor for added stability on the board.
Summary
Within the power supply of each K Series loudspeaker is a toroidal inductor, L13, that is a crucial part of the line filtering
scheme. In K Series loudspeakers covered by this bulletin, despite the adhesive that secures L13 mechanically to the print-
ed circuit board (PCB), vibrations associated with transport and usage of the loudspeaker could stress the inductor’s leads
enough that one or both break. If this happens, the power supply will not work, and the loudspeaker will be dead—com-
pletely inert—with no sound, fan movement, LED display, etc.
QSC prescribes two approaches to the L13 situation in the affected K Series loudspeakers, one remedial and one preven-
tative. The remedial solution is for repairing K Series loudspeakers that are inoperative because of an L13 failure, while the
preventative solution is for averting an L13 failure in otherwise well-functioning loudspeakers.
10.2 XLR combo jacks with locking tabs
Please read QSC service bulletin KKW0001 for more information regarding the change to XLRs with locking tabs.
Summary
K and KW series loudspeakers manufactured after November 2013 (serial dates codes of GKDxxxxxx or newer) have a
locking XLR and 1/4” TRS combo jack. Loudspeakers manufactured before November 2013 (serial date codes of GJDxxxxxx
or older) have a non-locking version of the jack. QSC changed the input connector to a locking version because all other
connectors, including the IEC power inlet and XLR output jack, have a locking mechanism. Field complaints about XLR con-
nectors detaching themselves from the jack due to natural vibrations in the speaker was another reason for changing to a
locking version of the jack.
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Weight and Dimensions
