RPM SCA-774 Single Channel Analyzer Board Replacement

Upon arrival, brief system operators on expected work, duration, anticipated alarms, and fault indications before starting work. 

Use orange safety (traffic control) cones to setup barriers. Practice established safety protocols. 

Open all doors needed to access components.

Locate Ethernet connector on top of SC-770 controller. Press release button on back of connector. Pull connector. 

Move LD-260 switch to OFF position. The PWR ON LED will turn off.

Use a magnet to disable tamper switches for all open doors. Use adhesive tape to disable older mechanical switches. 

Verify sensors mounted in control pillar door are receivers.

To disconnect sensor cable, turn collar counterclockwise and pull away from sensor.

Normally the cover screws are captured and should not come out of cover.

To prevent breaking the hinge on the module / door, once the retainer screws are loosened, take care to gently pull the bottom of the cover away from the module approximately ¼ʺ before letting the door open.

J8 and J11 should be labeled; write J6 and J10 on the appropriate connector in permanent marker.

J8 and J11 should be easily removed by grasping the connector and pulling it out with a gentle rocking motion.

J10 is locked in place by the position of J6; remove J6 first.

Do not lose the screws. They are re-used to secure the SCA-774 board.

BNC connectors are attached to the SCA-774 board and easily slide down then out of the SCA-775 box.

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.

Use screws previously removed.

Ensure all pins are engaged. It is easy to install the connectors one pin off in either direction. 

If the follow-on alignment and functional compliance test procedures are to be completed immediately, there is no need to close the SCA-775 module cover; if not, close the cover and tighten the screws. 

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

RPM will perform a power on self-test (POST) and collect a background radiation measurement.

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

RPM will perform a power on self-test (POST) and collect a background radiation measurement.

To reconnect sensor cable, align connectors, push towards sensor, and turn collar clockwise.

Remove magnets and/or adhesive tape from door tamper switches.

Insert Ethernet connector at top of SC-770 module. Connector will audibly "click" when seated properly. 

DET-RPM-RAP-RM03 RPM Operational Test.

Remove orange safety (traffic control) cones

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

As specified by management or contractual obligations.