Brother P-touch BB4 Service Manual page 22

(3) Unsolder the motor lead wires from the main PCB.
NOTE: Do not unsolder the wires of the plus and minus terminal ASSYs.
(4) Remove the three screws from the chassis ASSY.
Figure 2.2-5 Unsoldering the Motor Lead Wires and Removing the Chassis ASSY
(5) Lift the chassis ASSY up and out of the bottom cover. The cutter lever also comes
off.
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