Sanyo MCO-19M Service Manual page 46

<Key Lock password>
Key Lock password will be changed by following procedures.
Input a current using password and input a new password for twice.
The password for factory default setting is "0000".
Note) When you input a wrong password, audible alarm will sound for 1.5 seconds and "Wrong Password" will
be displayed under "Current User Password" column.
It is impossible to change Key Lock password during Key Lock is active.
"Key Lock" will be appeared in the upper right side of the display.
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