Xerox C3000 - Manual (Page 191)

Changing the Settings of Files in Memory
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4
D
Press [Check / Change Settings].
E
Press [Change TX Time].
F
Press [Clear], re-enter the transmission time using the number keys, and
then press [OK].
If you press [Transmit Now], the file is transmitted immediately. However, if
there is a file on standby, that file is sent first.
G
Press [Exit].
Repeat from step
C , if you want to change another transmission time.
H
Press [Exit] twice.
The standby display appears.