Troubleshooting guide

d. Check delay between sets of pulses
Wrist delay should be at least ¼ second between turns;
e. Check delay between direction change
Dial turn around should be at least ¼ second between turns.
4. Upon power up, the microprocessor reads and determines the phase relationship for initial
dial position. The microprocessor will output a two digit number and an arrow symbol for dial
position and direction to the display driver. The display driver then outputs this information to
the LCD through the 11 pin connector. The microprocessor will continually update the LCD
as the dial is turned by counting pulses and sampling phase relationships. When a direction
change is detected, the microprocessor will generate a new random number and write the
new number with the opposite arrow symbol to indicate the new direction and dial position.
This process will be continued as long as the dial is being turned, or until the required number
of direction changes have been detected.
5. When a direction change occurs, the microprocessor saves the last number it wrote to the
LCD driver. This number will be compared to the correct combination when the dial is
turned clockwise after it has detected the last number of the combination. A correct combi-
nation alone is not enough to open the lock. The system software has several routines that
check and validate the dialing process. If any of these are violated, the X-07 microprocessor
will not open the lock but will instead turn on the lightning bolt symbol to indicate a security
violation. If no violation has occurred, the microprocessor will write “OP” to the display
driver and fire the stepper motor after the reed switch is activated, assuming the dial speed
is correct.
6. The reed switch is a magnetically sensitive device that will close a circuit when a magnetic
field is passed near it. The X-07 has a reed switch mounted in the case assembly and a small
magnet mounted on the drive cam. The position of the magnet on the drive cam determines
when the reed switch will be activated. As the dial is turned, the magnet will pass over the
reed switch, once for each revolution of the dial. Therefore, the microprocessor will fire the
stepper motor within one revolution of the dial after “OP” is displayed on the LCD.
7. After the microprocessor has fired the stepper motor, the following mechanical sequence of
events will occur to open the X-07 lock.
a. The stepper motor gear will be in position for engagement with the drive cam gear teeth.
b. Drive cam is being driven by the user turning the dial.
c. As the drive cam teeth engage the stepper motor gear teeth, the stepper motor gear will
move in the counterclockwise direction (viewed from the front of the dial).
d. As the stepper motor gear moves counterclockwise, it will rotate the slide cam.
e. The slide cam will move the slide down.