Sharp AR-BC260 Service Manual page 268

10) With the above procedures, writing is started and the following
display is shown.
11) Check on the PC display that writing is completed. (When writ-
ing is normally completed, the following dialog is displayed.)
12) Turn off the machine power, and disconnect the level con-
verter.
(NOTE) When connecting or disconnecting the level converter, be
sure to turn off the machine power in advance. If the level
converter is connected or disconnected with the power
ON, the level converter may be damaged.
AR-BC260 ROM VERSION UP 12 - 13