5.2 Trouble Shooting
Have a good VOM meter to check voltages and continuity. A Meg-Ohm meter capable of checking
up to 500 meg-ohms of resistance is necessary to properly check the integrity of the ground loops.
When a malfunction occurs, isolate the problem to one of three areas: 1) the operator, 2) the loop
system, 3) the keying devices. One of the first steps in developing good trouble shooting habits is to
disconnect all external inputs to the circuit board.
1. Check the input indicator LEDs. They should only come ON when a keying device (card
reader, push button, etc.) is activated. If any of the input LEDs are ON continuously, this
will cause the gate operator to hold open. Disconnect the keying devices one at a time
until the LED goes OFF.
2. Check any external secondary entrapment protection devices. Any short or malfunction
in these devices can cause the gate operator to stop or to hold open.
3. A malfunction in a loop or loop detector can cause the gate operator to hold open, or to
not detect a vehicle when it is present over the loop. Pull the loop detector circuit boards
from the loop ports on the operator circuit board. If the malfunction persist, the problem
is not with the loop system. For more information on trouble shooting loops and loop
detectors, refer to your loop detector instruction sheet and to the DoorKing Loop and
Loop Detector Information Manual.
4. Check to be sure that there are no shorted or open control wires from the keying devices
to the gate operator. If a keying device fails to open the gate, momentarily jumper across
terminals 1 and 2 on the control board. If the gate operator starts, this indicates that a
problem exist with the keying device and not with the gate operator.
5. Check the supply voltage and batteries. A voltage drop on the supply line (usually
caused by using too small supply voltage wires) will cause the operator to malfunction.
Batteries should be fully charged for proper operation.
TROUBLESHOOTING
SYMPTON POSSIBLE SOLUTION(S)
Actuator(s) will not
run. Power LED is
OFF.
• Check that power to the operator is turned ON.
• Check for 24 VAC at terminals 19 and 20. If voltage measures OK, check the terminal
strip or replace the circuit board.
Actuator(s) will not
run. Power LED is
ON.
• Momentarily jumper terminal 1 to terminal 2. If the input LED does not come ON, check
the terminal strip or replace the circuit board. If LED does come ON, proceed to next
steps.
• Check the fuses.
• Remove the circuit board. With two 14 AWG insulated jumper wires, momentarily jumper
the battery terminals to the motor terminals (1, 2) of the Master actuator connector. The
actuator should run. Swap the two wires at the terminal strip. The actuator should run in
the opposite direction. Repeat these steps using the Slave actuator connector.
• If the actuator(s) run in both directions in the step above, replace the control board. If the
actuator(s) do not run, or run in only one direction, problem can be a bad actuator, wire
connections from the control board to the actuator(s) or a bad control board.
Page 38
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