HK Audio CT 118 Sub - Manual (Page 18)

ConTour Series 1.0
1 ConTour Series™
Replacement Parts
Note:
• If your equipment requires service, please turn
to your HK AUDIO ® dealer or the HK AUDIO ®
distributor in your country. They stock the
required spare parts.
• In the event of a defect, always indicate the
defective device’s serial number. This way the
HK AUDIO
® service team can immediately
ascertain if an update is available for your
product.
• Use only original HK AUDIO ® replacement
speakers and parts! Most of these have been
developed especially for HK AUDIO
® products
and are not available directly from speaker
manufacturers!
2 Replacing Loud-
speakers and Voice
Coils
2.1 8", 12", 15" and 18" Speakers
Proceed as follows to replace the given speaker:
• Unfasten and remove the Phillips screws on the
side panels holding the grille in place. Remove
the grille. On the CT 118 Sub these screws are
located on the front panel.
• Unfasten and remove the hex head bolts holding
the speaker in place.
The speaker is now detached. Disconnect the
speaker wires.
When installing and connecting a replacement
speaker, ensure the polarity is correct!
Red= positive, black = negative
2.2 The Drivers’ Voice Coils
Proceed as follows to replace the drivers’ voice
coils:
• Remove the front grille as described above.
• Unfasten the four screws holding the horn yoke
and remove the horn and driver from the baffle.
• Disconnect the wires connecting the driver.
When installing and connecting a replacement
speaker, ensure the polarity is correct! Red=
positive, black = negative.
• Unfasten the voice coil housing’s four hex head
bolts using a 3-mm wrench. Disconnect the
wires at the push-pins.
• Take the lid off the voice coil housing.
• The voice coil can now be replaced.
Important note: Replace the voice coil in a clean
working environment only. Be sure to keep dust
and dirt out of the open driver. If despite your
precautions particles manage to get in, use a strip
of adhesive tape to remove them or carefully blow
compressed air into the back of the driver to
whisk the particles out. When installing the new
voice coil, ensure it is centered properly. Proceed
as follows to check this:
Close the cover of the voice coil housing and
reconnect the cords (red = positive, black =
negative). Feed a sine wave signal with a
frequency between 1000 Hz and 1500 Hz into the
mid/high enclosure’s input. Sweep through the
frequency. If you hear abrasive noises like
crackling or scratching, the voice coil is not
centered properly. Reopen the voice coil chassis
and turn the voice coil a bit until the signal is
rendered cleanly!
E Service
Figure 32: CT 112 sans grille