EXP Computer C4077-90960 - Manual (Page 213)

Interlock Switch
1 Remove the left cover (see Figure 6-65).
2 Disconnect (2) wires from the Interlock Switch (Figure 6-73, callout 1).
3 Press the retainer tabs together (Figure 6-73, callout 2) to release the switch
and remove it from the rear of the unit.
Multi-Bin Mailbox/Mailbox with Stapler, Interlock Switch
Figure 6-73
6-86 Removal and Replacement