High Frequency Transducer - QSC K.2 Series Service Manual

5.4 High frequency transducer

The K8.2 and K10.2's HF transducer is secured to the baffle by four mounting
holes inside the waveguide. Covering the screws are 4 oval labels that allow
the high frequency sound waves to propagate out correctly. The K12.2's HF
transducer is secured on the baffle as well, but behind the waveguide.
K8.2 and K10.2 high frequency transducer removal
The front baffle must be fully removed to gain access to the HF transducer.
1. Disconnect the yellow and yellow/black wires from the HF transducer's
terminals.
2. Remove the 4 oval labels from the waveguide. Save for re-installation.
3. Remove the 4 screws, 4 washers, and 4 lock-washers that secure the HF
transducer to the baffle. See Figure 5.4.1.
4. The HF transducer can now be removed from the baffle.
K12.2 high frequency transducer removal
It's required to remove the baffle from the main enclosure for HF transducer
removal.
1. Disconnect the yellow (+) and yellow/black (-) wires from the HF trans-
ducer's terminals. The faston connectors have a locking tab on them that must
be pressed to release the connector from the speaker tab.
2. Remove the 4 screws, 4 lock washers, and 4 normal washers that secure
the HF transducer to the baffle. See Figure 5.4.2.
3. The HF transducer can now be removed from the baffle.
Diaphragm replacement
Instead of replacing the entire HF transducer, the transducer can be repaired
by replacing the diaphragm. Replacing the diaphragm can be much cheap-
er than replacing the entire HF transducer. Follow the instructions below to
replace the diaphragm.
1. Remove the 4 screws that secure the cover to the frame of the transduc-
er.
2. Lift the cover away from the transducer assembly.
3. Remove the diaphragm as shown in Figure 5.4.3.
4. Clean out the gap that the voice coil sits in. Wipe the edges of the gap
with isopropyl alcohol and spray the gap with compressed air to remove
all contaminants inside.
5. Install the new diaphragm with the correct orientation.
6. Place the cover back on the transducer assembly.
7. Fasten the 4 screws to secure the cover on the transducer assembly.
Transducer installation
Simply follow the removal instructions in reverse.
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Figure 5.4.1 - K8.2 and K10.2 HF transducer
Figure 5.4.2 - K12.2 HF transducer only
Figure 5.4.3 - Diaphragm removal with HF
transducer still fastened to baffle
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