RPM Alarm Strobe Light Assembly Replacement

Use orange safety (traffic control) cones or equivalent per site-specific safety practices. 

For vehicle monitors: Open the upper RPM door

For train monitors: Open the control cabinet 

Using a small flathead screwdriver, for the blue neutron strobe, remove wires:

Red wire - Pin 5

Black wire - Pin 1

Using a small flathead screwdriver, for the red gamma strobe, remove wires:

Red wire - Pin 7

Black wire - Pin 2

Blue neutron strobe:

Positive terminal (+): Two (2) red wires

Negative terminal (P): One (1) blue wire and one (1) black wire

Red gamma strobe

Positive terminal: Two (2) red wires

Negative terminal (S): One (1) brown wire and one (1) black wire

Use cutter pliers to remove any fasteners associated wth strobe light wiring.

Remove forked connectors from Sonalert using a small Phillips screwdriver. Use cutter pliers to remove forked connectors from strobe wires. 

Use a small flathead screwdriver to pry the circular black cover off.

Use a 3/16" Allen wrench to remove strobe light assembly.

Use a putty knife to pry strobe assembly off RPM door.

Use a putty knife to remove silicone or residue off RPM door.

Use tag or tape. Include date of removal, description of failure symptoms, country, site, and lane number. Dispose per Nuclear Smuggling Detection and Deterrence (NSDD) guidance or contractual requirements.

Insert new strobe light assembly wires through grommet located in RPM door.

Align strobe assembly hole to the hole in the front of the RPM door. Then, firmly press on edges to ensure silicone adheres to the door surface. 

Use a 3/16" Allen wrench to tighten clockwise until secure.

Using a small flathead screwdriver, for the blue neutron strobe, remove wires:

Red wire - Pin 5

Black wire - Pin 1

Using a small flathead screwdriver, for the red gamma strobe, remove wires:

Red wire - Pin 7

Black wire - Pin 2

Blue neutron strobe:

Positive terminal (+): Two (2) red wires

Negative terminal (P): One (1) blue wire and one (1) black wire

Red gamma strobe

Positive terminal: Two (2) red wires

Negative terminal (S): One (1) brown wire and one (1) black wire

Remove ¼ inch (6mm) of insulation from the strobe light assembly wire end using wire stripper (if necessary). Insert end of wire into terminal end and crimp using a crimping tool.

Using a small Phillips screwdriver, terminate the forked connectors to the correct locations on the Sonalert.

Move LD-260 switch to ON position. The LED PWR ON will illuminate.

DET-RPM-RAP-RM03, Operational Testing procedure.

Record observations, times, and results for the maintenance report.

As specified by management or contractual obligations.