Jack JK-T781E Series - Technician Mode Access

6、Enter technician mode*（11-25）
Press F key
and at the
same time boot
the machine up
Press up and
down key to change
parameter items.
Press enter key to
get the value of this
parameter.
Press up and down
key to modify the
parameter value.
Press enter key to
save the value
Press F key to get out
of this mode.