MBM Corporation 1500S - Manual (Page 42)

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(C) Clearing Memory
Clear the storage input in the memory 1/2/3 keys and the fold type keys
Press first a desired Memory 1/2/3 Key or Fold Type Key
being stored first and then keep pressing the C Key. Release
immediately the C Key when you hear a beep sound.
The lamp of the key in which the storage has been cancelled
will light.
Note:
The lamp of the key in which the fold pattern is stored
flashes.
Clear key
(D) Clearing all the memorized patterns
Turn off the power and while pressing the C Key, turn on the
power.
Note:
All the stored pattern including custom fold you memorized is
cleared. No chance to recall after cleared.
Clear key