Brother P-touch BB4 Service Manual page 23

Disassembling the Chassis ASSY
When handling the thermal head ASSY, do not touch the thermal head by hand. It may be
easily damaged due to the electricity charged in your body.
(1) Remove the screw from the thermal head ASSY and take off the ASSY.
(2) Remove the retaining ring from the shaft of the chassis ASSY.
(3) Pull up the roller holder ASSY together with its spring.
(4) Remove the two screws from the chassis ASSY and take off the DC motor ASSY.
Figure 2.2-6 Disassembling the Chassis ASSY
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