17
Installation and Maintenance Instructions
Models 151XST and 151XST-S
6.
Test the beacon for proper operation.
Figure 4 Normal (A) and darkened (B) flash tube
A
B
290A7396
Replacing the Printed Circuit Board (PCB)
To replace the PCB:
1.
Disconnect the power to the beacon and wait at least 5
minutes to allow all capacitors to discharge.
2.
Remove the threaded dome assembly by twisting it
counterclockwise.
3.
Remove and retain the screw that secures the circuit board
to the housing.
4.
Disconnect power to the PCB:
a)
To replace a Series A1 PCB, disconnect the two supply
wires from the old circuit board and connect them
to the mating side of the supplied adapter assembly.
Connect the other side of the adapter assembly to the
new circuit board.
b)
To replace a Series A2 circuit board, disconnect the
power connector from the old circuit board and connect
it to the connector on the new circuit board.
NOTE:
Ensure that the connector is fully seated on the
circuit board connectors.
