Canon TX-2000 Online Manual page 330

(K) 3-Inch Paper Core Attachment
Attaches to the Roll Holder when you are using a roll paper with a 3-inch paper core.
(L) Feed Flap Switch
Change the feed flap position depending on the roll unit mode.
(M) Roll Holder
Load the roll on this holder.
(N) Holder Stopper
This part secures the roll paper on the Roll Holder.
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