Diagnostics Check; Troubleshooting - DoorKing 1601 Installation & Owner's Manual

8.2 Diagnostics Check

Have the following diagnostic tools available: VOM meter with minimum voltage memory or min-max range to check voltage
and continuity. Meg-ohm meter capable of checking up to 500 megohms of resistance to properly check ground loop integrity.
A malfunction can be isolated to one of the following:
• Gate Operator
• Loop System
• Keying Devices
Disconnect all external inputs to the circuit board terminal.
1. Use caution when checking high voltage areas: terminals 1 through 6, the motor capacitor and the motor.
2. Check the input indicator LED's. They should only come ON when a keying device (card reader, push button, etc.) is
activated. If any of the input LED's are ON continuously, this will cause the gate operator to hold the arm up. Disconnect the
keying devices one at a time until the LED goes OFF (see troubleshooting guide).
3. If the operator stops or holds open, check external entrapment protection devices for any shorts or malfunction.
4. A malfunction in a loop or loop detector can cause the gate operator to hold the arm up, or 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
persists, the problem is not with the loop system. For more information refer to the loop detector instruction sheet and the
DoorKing Loop and Loop Detector Information Manual.
5. Check 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 arm, momentarily jumper across terminals 6 and 14 on the control board terminal. If the gate operator starts, this
indicates that a problem exist with the keying device and not with the gate operator.
6. Check the supply voltage and batteries. A voltage drop on the supply line (usually caused by using wires that are too small)
will cause the operator to malfunction. Batteries should be fully charged for proper operation, replace batteries every two years
on average.

8.3 Troubleshooting

Symptom
Operator will not run.
Power LED is OFF.
1601-065-P-12-19
• Check that power to the operator is turned ON.
• Check for 117 VAC with a voltmeter at control board terminals 1 and 2. If voltage measures 0,
check power supply to operator or check terminal strip. If voltage measures OK, replace control
board.
Possible Solution(s)
33