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7.2 – M-C12: Removing the drive unit
TOOLS REQUIRED: 4mm & 5mm Allen keys
1.
Complete step 7.1 above to remove the grille.
2.
Using a 4mm Allen key, remove the four M6x30 countersunk socket screws that secure the grille
braces. Remove those grille braces and set to one side.
M6x30 countersunk socket screws
3.
Using a 5mm Allen key, undo the eight M6x30 socket cap bolts holding the drive unit in place. Ensure
you also collect the spring washers.
4.
Lift the drive unit clear of the mounting hole and disconnect the cables – note the polarity for
reconnection (brown to LF positive, blue to LF negative, white to HF positive, yellow to HF negative).
5.
To replace the drive unit, ensure the 12" gasket is intact and complete – replace if necessary.
Reconnect the cables to the drive unit (note the polarity detailed above) and then sit the drive unit
into its mounting location, ensuring that the mounting holes line up.
6.
Replace the M6x30 socket cap machine screws with their spring washers and ensure all machine
screws are started in their threads before tightening. Tighten opposing bolts, working around the
drive unit until all bolts are appropriately tightened. Be careful not to overtighten as this will distort
the drive unit chassis.
7.
Replace both grille braces and secure them in place with M6x30 countersunk socket bolts.
8.
Replace the grille as described above.
M6x30 socket cap bolts
Page 21 of 27
M-C12 User Manual
v2 November 2019
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