5-42 Confidential
5.1.10 Backup Battery (MFC640CW/820CW)
(1) Disconnect the battery harness from the main PCB.
(2) Release the ink supply tubes routed on the lower cover from the tube guides.
NOTE: Releasing those tubes makes it easy to release the battery harness from the hook
provided on the lower cover since the battery harness is routed beneath those tubes. (See
Section 5.1.17, Routing E.)
(3) Release the battery harness from the hook and remove the backup battery.
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