8808 - Radiation Detection - Neutron | FRONTLINE Maintenance Tool

DET-RPM-RAP-FC06

1544 - 546 - Done - Complete, Notes: 547

546 - Done

Done

Step Reference Number

20

Note

547 - Troubleshooting is complete.

5882 - 545 - Contact Technical Support - Incomplete, Notes: 5881

545 - Contact Technical Support

Contact Technical Support

Step Reference Number

18

Note

5881 - Troubleshooting incomplete. Contact technical support. Provide the ...

8823 - 8168 - Did this fix the problem? - Decision, Notes:

8168 - Did this fix the problem?

Did this fix the problem?

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9057 - 9054 - Disconnect RPM Battery - Process, Notes: 9055

Step Reference Number

07

9952 - 9949 - Replace Helium-3 tube - Formal Procedure, Notes: 9950

9955 - Note : Helium-3 tube failures are extremely rare.

Type

Note

Helium-3 tube failures are extremely rare.

9949 - Replace Helium-3 tube

Replace Helium-3 tube

Go to

8823 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9950 - If a spare Helium-3 tube is available, perform the following procedure:

9951 - DET-RPM-RAP-CM21, Neutron Detector Helium-3 (He3) Tube Replacement.

9956 - 9953 - Replace PMFX Box - Formal Procedure, Notes: 9007

9953 - Replace PMFX Box

Replace PMFX Box

Go to

8823 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9007 - Perform the following procedure:

9954 - DET-RPM-RAP-CM04, RPM Neutron Signal Pick-Off Box (PMFX) Replacement

9095 - 9093 - Replace SC-771 Controller Board - Formal Procedure, Notes: 9007

9093 - Replace SC-771 Controller Board

Replace SC-771 Controller Board

Note

9007 - Perform the following procedure:

9094 - DET-RPM-RAP-CM09, RPM SC-771 Controller Board Replacement.

9098 - 9096 - Replace SCA-774 Board - Formal Procedure, Notes: 9007

9096 - Replace SCA-774 Board

Replace SCA-774 Board

Note

9007 - Perform the following procedure:

9097 - DET-RPM-RAP-CM07, SCA-774 RPM Single Channel Analyzer Board Replacement. ...

9958 - 9869 - Swap SC-770 controller connectors - Decision, Notes: 7236

9873 - Note : Be sure to return all cables and connectors to their correct positions at the...

Type

Note

Be sure to return all cables and connectors to their correct positions at the end of troubleshooting and repair effort

9869 - Swap SC-770 controller connectors

Swap SC-770 controller connectors

Yes

Go to

9098 - 9096 - Replace SCA-774 Board - Formal Procedure, Notes: 9007

No

Go to

9095 - 9093 - Replace SC-771 Controller Board - Formal Procedure, Notes: 9007

Note

7236 - Move LD-260 switch to OFF position. The PWR ON

9870 - Switch the positions of the large 19-pin connectors on the bottom of the SC-7...

7367 - Move LD-260 switch to ON position. The PWR ON

9871 - Wait for controller to complete POST and obtain initial background

9957 - Did the fault indication move from the original pillar (for example: DET 5/6 ...

9961 - 9959 - Replace MHV cable - Decision, Notes: 9960

9955 - Note : Helium-3 tube failures are extremely rare.

Type

Note

Helium-3 tube failures are extremely rare.

9959 - Replace MHV cable

Replace MHV cable

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9952 - 9949 - Replace Helium-3 tube - Formal Procedure, Notes: 9950

Note

9960 - Replace the suspected MHV cable on the bottom of the PMFX Box

8861 - Did this fix the Issue?

9963 - 9898 - Reset ULD/LLD - Decision, Notes: 9899

9898 - Reset ULD/LLD

Reset ULD/LLD

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9958 - 9869 - Swap SC-770 controller connectors - Decision, Notes: 7236

Note

9899 - Navigate to DSCR. ADJUST on the SC-770

9962 - 2:Neutron>2:Functions>2:DSCR. ADJUST

9901 - Press the * key to reset control pillar to default values

9902 - Press the # key

9903 - Press the * key to reset auxiliary pillar to default values

9904 - Press the # key 3 times to exit programming mode

9871 - Wait for controller to complete POST and obtain initial background

8861 - Did this fix the Issue?

9967 - 9964 - Swap cables at bottom of PMFX Box - Decision, Notes: 9885

9873 - Note : Be sure to return all cables and connectors to their correct positions at the...

Type

Note

Be sure to return all cables and connectors to their correct positions at the end of troubleshooting and repair effort

9964 - Swap cables at bottom of PMFX Box

Swap cables at bottom of PMFX Box

Yes

Go to

9961 - 9959 - Replace MHV cable - Decision, Notes: 9960

No

Go to

9956 - 9953 - Replace PMFX Box - Formal Procedure, Notes: 9007

Note

9885 - Navigate to SHOW COUNTS on the SC-770

9965 - 2:Neutron>2:Functions>1:Show Counts

9966 - While watching SHOW COUNTS, switch the pairs of MHV connectors for neutron CH...

9888 - Did the fault indication move from the original channel to the other?

9969 - 9884 - Swap signal cables at SCA-774 board - Decision, Notes: 9885

9873 - Note : Be sure to return all cables and connectors to their correct positions at the...

Type

Note

Be sure to return all cables and connectors to their correct positions at the end of troubleshooting and repair effort

9884 - Swap signal cables at SCA-774 board

Swap signal cables at SCA-774 board

Yes

Go to

9967 - 9964 - Swap cables at bottom of PMFX Box - Decision, Notes: 9885

No

Go to

9958 - 9869 - Swap SC-770 controller connectors - Decision, Notes: 7236

Note

9885 - Navigate to SHOW COUNTS on the SC-770

9965 - 2:Neutron>2:Functions>1:Show Counts

9968 - While watching SHOW COUNTS, switch the BNC connectors for neutron CH3 and CH4...

9888 - Did the fault indication move from the original channel to the other?

9970 - 8168 - Did this fix the problem? - Decision, Notes:

8168 - Did this fix the problem?

Did this fix the problem?

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9969 - 9884 - Swap signal cables at SCA-774 board - Decision, Notes: 9885

9971 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

9855 - Replace High Voltage Board

Replace High Voltage Board

Go to

9970 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9007 - Perform the following procedure:

9856 - DET-RPM-RAP-CM25, RPM HHV-448/458 High Voltage Board Replacement.

9972 - 9953 - Replace PMFX Box - Formal Procedure, Notes: 9007

9953 - Replace PMFX Box

Replace PMFX Box

Go to

9970 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9007 - Perform the following procedure:

9954 - DET-RPM-RAP-CM04, RPM Neutron Signal Pick-Off Box (PMFX) Replacement

9976 - 9973 - Measure PMFX Box output high voltages - Decision, Notes: 9974

9973 - Measure PMFX Box output high voltages

Measure PMFX Box output high voltages

Yes

Go to

9969 - 9884 - Swap signal cables at SCA-774 board - Decision, Notes: 9885

No

Go to

9971 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

Note

9974 - Measure the HV on the MHV cables at each Helium-3 tube using a digital multi-...

9975 - Are ALL the measured voltages between +1240 VDC and +1260 VDC?

9981 - 8168 - Did this fix the problem? - Decision, Notes:

8168 - Did this fix the problem?

Did this fix the problem?

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9976 - 9973 - Measure PMFX Box output high voltages - Decision, Notes: 9974

9982 - 9978 - Perform Functional Compliance Test - Formal Procedure, Notes: 9007

9980 - Note : Only the neutron portion of the FCT is required

Type

Note

Only the neutron portion of the FCT is required

9978 - Perform Functional Compliance Test

Perform Functional Compliance Test

Go to

9981 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9007 - Perform the following procedure:

9979 - DET-RPM-RAP-RM05, RPM Functional Compliance Test

9987 - 9983 - Replace high voltage cable - Decision, Notes: 9984

9983 - Replace high voltage cable

Replace high voltage cable

Yes

Go to

9982 - 9978 - Perform Functional Compliance Test - Formal Procedure, Notes: 9007

No

Go to

9971 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

Note

9984 - Replace the high voltage cable between the SCA-775 module and the PMFX Box

9985 - Attempt to adjust neutron high voltage on the neutron HV-448/458 board R1 to ...

9986 - Is the neutron high voltage between +1365 VDC and +1385 VDC?

9989 - 9988 - Adjust neutron high voltage - Decision, Notes: 9985

9988 - Adjust neutron high voltage

Adjust neutron high voltage

Yes

Go to

9982 - 9978 - Perform Functional Compliance Test - Formal Procedure, Notes: 9007

No

Go to

9987 - 9983 - Replace high voltage cable - Decision, Notes: 9984

Note

9985 - Attempt to adjust neutron high voltage on the neutron HV-448/458 board R1 to ...

9986 - Is the neutron high voltage between +1365 VDC and +1385 VDC?

9992 - 9990 - Measure PMFX Box input high voltage - Decision, Notes: 9991

9990 - Measure PMFX Box input high voltage

Measure PMFX Box input high voltage

Yes

Go to

9976 - 9973 - Measure PMFX Box output high voltages - Decision, Notes: 9974

No

Go to

9989 - 9988 - Adjust neutron high voltage - Decision, Notes: 9985

Note

9991 - Measure the HV on the MHV cable at the center top of the PMFX box using a dig...

9986 - Is the neutron high voltage between +1365 VDC and +1385 VDC?

9993 - 9851 - Replace affected signal cable - Decision, Notes: 9852

9851 - Replace affected signal cable

Replace affected signal cable

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9992 - 9990 - Measure PMFX Box input high voltage - Decision, Notes: 9991

Note

9852 - Replace the signal cable on the affected channel

8861 - Did this fix the Issue?

9995 - 9910 - Gently wiggle signal cable - Decision, Notes: 9911

9910 - Gently wiggle signal cable

Gently wiggle signal cable

Yes

Go to

9993 - 9851 - Replace affected signal cable - Decision, Notes: 9852

No

Go to

9992 - 9990 - Measure PMFX Box input high voltage - Decision, Notes: 9991

Note

9911 - Gently wiggle the affected channel’s signal cable above the connector where...

9994 - Gently wiggle the affected channel’s signal cable above the connector where...

9913 - Did the displayed count rate change?

9996 - 9921 - Gently wiggle BNC connectors - Decision, Notes: 9922

9921 - Gently wiggle BNC connectors

Gently wiggle BNC connectors

Yes

Go to

9098 - 9096 - Replace SCA-774 Board - Formal Procedure, Notes: 9007

No

Go to

9995 - 9910 - Gently wiggle signal cable - Decision, Notes: 9911

Note

9922 - Gently wiggle the affected channel’s signal cable BNC connector where it is...

9913 - Did the displayed count rate change?

9998 - 9941 - Measure discriminator voltages - Decision, Notes: 9997

9941 - Measure discriminator voltages

Measure discriminator voltages

Yes

Go to

9996 - 9921 - Gently wiggle BNC connectors - Decision, Notes: 9922

No

Go to

9963 - 9898 - Reset ULD/LLD - Decision, Notes: 9899

Note

9997 - Using a digital multimeter, measure the discriminator voltages on the SCA-774...

9943 - Are the ULD/LLD voltages correct?

10000 - 10651 - Restart RPM - Decision, Notes: 9946

9947 - Reminder : There are a limited number of faults that can affect both pillars; troublesho...

Type

Reminder

There are a limited number of faults that can affect both pillars; troubleshoot each pillar independently starting with the control pillar. Failure of components that are common to both gamma detector channels should affect both channels similarly. If the problems in the channels are different (GH in one and GL in the other), troubleshoot the gamma channels separately.

9999 - Note : If there are no or low neutron counts on a channel, place a source on the aff...

Type

Note

If there are no or low neutron counts on a channel, place a source on the affected detector before performing troubleshooting steps

10651 - Restart RPM

Restart RPM

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9998 - 9941 - Measure discriminator voltages - Decision, Notes: 9997

Note

9946 - Restart the RPM by cycling the on/off switch on the LD-260

8861 - Did this fix the Issue?

Flowchart Title

Radiation Detection - Neutron