Constant False Trips; Replacement Of The Circuit Board - Advanced Detection Systems 1200E Series Installation Manual And Owner's Manual

CONSTANT FALSE TRIPS

Check to make sure that the product being inspected has not changed in any
way. If a product changes in moisture, temperature, or mass it will change
the product curve and the current settings could fall outside of the
curve, causing false triggers. If this occurs, return to the set-up
portion of the manual and reset the detector for the new product
parameters, or re-learn the product using Menu 31.
Observe the five calibration indicators on the front panel. If indicators
"C" "D" or "E" are brightly lit, the detector is out of balance and you
should call the factory.
Check to make sure that there are no devices in the area that are
transmitters of radio frequencies. They will interfere with the detector
and cause false triggers.
Check for metal in the metal-free zone.
Call the factory for support.

REPLACEMENT OF THE CIRCUIT BOARD

Failure of the circuit board is rare. Be sure that you have eliminated all
other possible problems before proceeding. To replace the circuit board:
1. Turn off power to the metal detector. Be sure all additional sources of
power to the output circuits have also been turned off.
2. Remove the aluminum cover plate by removing the six retaining screws.
Newer detectors do not have an aluminum cover plate. The plate has been
eliminated and the display has been mounted to the back side of the door
assembly.
3. Disconnect the two large plugs near the top of the circuit board. Also
unplug the display, keypad, and LED power cables.
4. Remove the wires from the terminals at the bottom of the circuit board.
It's a good idea to tag each of the wires for easier relocation.
5. Remove the eight screws that hold the circuit board in place.
6. Remove the circuit board and put it in a safe place. The replacement
circuit board is shipped in a conductive pouch. The defective circuit
board should be placed into the pouch and returned to the factory for
repair.
Installation is the reverse of the above.
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