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14.0 - Servicing Information
All HALO-C components can be removed for service purposes if required, using the
minimum of tools.
HALO-C: Removing the AMT high frequency drive unit
1. Lie the enclosure on its' side and remove the three flange head screws securing
the grille with a PoziDrive PZ2 screwdriver. Turn the enclosure over and repeat
for the other side. Gently lift the grille off and set to one side.
2. Turn the enclosure on to its' front, and remove the six M4 socket cap bolts
retaining the rear door – for this you will need a 3mm Allen bit. Ensure to collect
both the flat and spring washers for each bolt. Gently ease the rear door from its
location – be aware it is sealed in place with a gasket which can make it resistant
to coming loose. If this is the case, either use an NL4 connector plugged into the
loudspeaker as an aid, or gently lever the rear door up with a large flat-blade
screwdriver. As soon as the door is free, disconnect the cables to the drive units
which are at each end of the PCB attached to the inside of the door. Put the door
to one side with its screws for reinstallation later.
3. Remove the wadding behind the AMT device. Behind the AMT device you will see
four M5 Nyloc nuts, which secure the drive unit in place. Using a nut spinner
(ideally one with a flexible drive shaft), socket or ring spanner undo and remove
these nuts and collect the flat washers. The stud section will remain attached to
the drive unit. You have now released the AMT unit, however it will not come
free as it is retained at the front of the enclosure by part of the cabinet.
4. Gently turn the enclosure onto its back. You can now lift the AMT waveguide and
it will come free, but is retained by another panel within the enclosure. Lift the
waveguide as far as it will go, and tilt the AMT
will then see three M5 socket cap bolts securing the retaining panel. Using a
4mm Allen bit, undo and remove these three bolts, and ensure to collect both the
flat and spring washers for each one. The retaining panel can now be removed.
Now, tilt the AMT
connected to the terminal PCB on the AMT. Disconnect the cables and the AMT
can now be lifted clear of the enclosure.
5. To remove the AMT from its waveguide, undo the six M6 socket cap bolts
securing the AMT to the waveguide using a 5mm Allen key, and lift the
waveguide clear. Be aware the magnet on the AMT is very powerful! Steel
tools will get attracted to it!
6. To reinstate the AMT unit, insert it into the cavity and tilt toward the 8" drive unit
to connect the cables. Note the polarity – white cable to positive terminal (red
mark), yellow cable to negative terminal. Once connected, tilt the AMT
the 8" drive unit to access the locating holes for the machine screws that secure
the retaining panel. Reinstate the panel and the screws and retighten. Return
the AMT to vertical, and locate the four studs on the back surface in their locating
holes in the enclosure. Once located, turn the enclosure back onto its front, and
toward
the 8" drive unit – you will then see the cables
away
from the 8" drive unit – you
HALO Compact User Manual
V7 December 2019
away
from
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