the rubber grommet is on the upper left corner (viewing from back). Mount the controller
box ground wire to the lower left screw as shown in Figure 29.
Figure 29. Back view of the controller box. Red arrow indicated ground wire location.
7)
Clean the controller box mounting area on the espresso machine with a cotton ball soaked
with alcohol to ensure a good adhesion of the box, as shown in Figure 30. This is very
important because the metal surface might contain oil that reduces the bonding strength of
the tape. When properly installed, 3M double tape is very strong and durable. It has been
used for industrial use such as in building structures and automobile parts.
Figure 30. Cleaning the box mounting area with alcohol.
8)
Remove the protection film on the double side tape on the box. Slowly and carefully mount
it on the espresso machine. Make sure there is a gap between the group head and box as
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