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7.2 – EMS-41: Removing the drive unit
TOOLS REQUIRED: 3mm Allen key
1.
Complete step 7.1 above to remove the grille.
2.
Using a 3mm Allen key, remove the four M4x16 button head socket screws that secure the drive unit.
Ensure that you collect both the spring washers and the large flat washers as well as the machine
screws.
3.
Lift the drive unit clear of the mounting hole and disconnect the four cables – note the polarity for
reconnection (brown to LF positive, blue to LF negative, white to HF positive, yellow to HF negative).
Also please pay particular attention to the orientation of the crimp connectors on the drive unit, and
the orientation of the drive unit terminals within the cabinet.
4.
To replace the drive unit, ensure the adhesive gasket on the rear of the 4" 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.
5.
Replace the M4x16 button head socket machine screws with their spring washers and large flat
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.
6.
Replace the grille as described above.
Page 21 of 25
M4x16
button head socket screws
EMS-41 User Manual
v1 November 2019
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