8807 - Radiation Detection - Gamma | FRONTLINE Maintenance Tool

DET-RPM-RAP-FC05

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 ...

1544 - 546 - Done - Complete, Notes: 547

546 - Done

Done

Step Reference Number

20

Note

547 - Troubleshooting is complete.

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

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.

9842 - 9840 - Replace gamma detector - Formal Procedure, Notes: 9007

9840 - Replace gamma detector

Replace gamma detector

Go to

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

Note

9007 - Perform the following procedure:

9841 - DET-RPM-RAP-CM22, Gamma Detector Assembly Replacement.

9845 - 9843 - Light Leak? - Decision, Notes: 9844

9843 - Light Leak?

Light Leak?

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9842 - 9840 - Replace gamma detector - Formal Procedure, Notes: 9007

Note

9844 - It is unlikely that the gamma detector would need to be replaced. Insp...

8861 - Did this fix the Issue?

9848 - 9846 - GH or GL? - Decision, Notes: 9847

9846 - GH or GL?

GH or GL?

HI

Go to

9845 - 9843 - Light Leak? - Decision, Notes: 9844

LO

Go to

9842 - 9840 - Replace gamma detector - Formal Procedure, Notes: 9007

Note

9847 - Is the fault indication on the affected channel HI or LO?

9853 - 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

9848 - 9846 - GH or GL? - Decision, Notes: 9847

Note

9852 - Replace the signal cable on the affected channel

8861 - Did this fix the Issue?

9857 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

9855 - Replace High Voltage Board

Replace High Voltage Board

Go to

8823 - 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.

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. ...

9858 - 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

9853 - 9851 - Replace affected signal cable - Decision, Notes: 9852

9864 - 9861 - Replace VD-580 - Formal Procedure, Notes: 9862

9861 - Replace VD-580

Replace VD-580

Go to

9858 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9862 - Perform the following procedure on the affected channel:

9863 - DET-RPM-RAP-CM03, RPM VD-580 Replacement

9874 - 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

9872 - Did the fault indication move from the original pillar (for example: DET 1/2 ...

9889 - 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

9864 - 9861 - Replace VD-580 - Formal Procedure, Notes: 9862

No

Go to

9874 - 9869 - Swap SC-770 controller connectors - Decision, Notes: 7236

Note

9885 - Navigate to SHOW COUNTS on the SC-770

9886 - 1:Gamma>2:Functions>1:Show Counts

9887 - While watching SHOW COUNTS, switch the BNC connectors for gamma CH1 and CH2 a...

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

9892 - 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

9889 - 9884 - Swap signal cables at SCA-774 board - Decision, Notes: 9885

Note

9852 - Replace the signal cable on the affected channel

8861 - Did this fix the Issue?

9905 - 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

9874 - 9869 - Swap SC-770 controller connectors - Decision, Notes: 7236

Note

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

9900 - 1:Gamma>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?

9914 - 9910 - Gently wiggle signal cable - Decision, Notes: 9911

9910 - Gently wiggle signal cable

Gently wiggle signal cable

Yes

Go to

9892 - 9851 - Replace affected signal cable - Decision, Notes: 9852

No

Go to

9889 - 9884 - Swap signal cables at SCA-774 board - Decision, Notes: 9885

Note

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

9912 - Gently wiggle the affected channel’s signal cable above the connector where...

9913 - Did the displayed count rate change?

9923 - 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

9914 - 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?

9928 - 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

9857 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

9932 - 9930 - Perform an Electronic Alignment - Formal Procedure, Notes: 9007

9930 - Perform an Electronic Alignment

Perform an Electronic Alignment

Go to

9928 - 8168 - Did this fix the problem? - Decision, Notes:

Note

9007 - Perform the following procedure:

9931 - DET-RPM-RAP-CM01, RPM Electronic Alignment.

9936 - 9933 - Adjust gamma high voltage - Decision, Notes: 9934

9933 - Adjust gamma high voltage

Adjust gamma high voltage

Yes

Go to

9932 - 9930 - Perform an Electronic Alignment - Formal Procedure, Notes: 9007

No

Go to

9857 - 9855 - Replace High Voltage Board - Formal Procedure, Notes: 9007

Note

9934 - Attempt to adjust gamma high voltage on the gamma HV-448/458 board R1 to +900...

9935 - Is the gamma high voltage now approximately 900VDC?

9940 - 9937 - Measure gamma high voltage - Decision, Notes: 9938

9937 - Measure gamma high voltage

Measure gamma high voltage

Yes

Go to

9936 - 9933 - Adjust gamma high voltage - Decision, Notes: 9934

No

Go to

9923 - 9921 - Gently wiggle BNC connectors - Decision, Notes: 9922

Note

9938 - Measure the HV on the MHV cable at both detectors using a digital multi-meter...

9939 - Is the measured voltage significantly less than 900 VDC?

9944 - 9941 - Measure discriminator voltages - Decision, Notes: 9041

9941 - Measure discriminator voltages

Measure discriminator voltages

Yes

Go to

9940 - 9937 - Measure gamma high voltage - Decision, Notes: 9938

No

Go to

9905 - 9898 - Reset ULD/LLD - Decision, Notes: 9899

Note

9041 - Using a digital multimeter in DC mode,verify 15 VDC at TB1 pins 1, 2, and 3.

9942 - measure the discriminator voltages on the SCA-774 boards at:

9943 - Are the ULD/LLD voltages correct?

9948 - 9945 - 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.

9945 - Restart RPM

Restart RPM

Yes

Go to

1544 - 546 - Done - Complete, Notes: 547

No

Go to

9944 - 9941 - Measure discriminator voltages - Decision, Notes: 9041

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 - Gamma