Technical data

85108L System Manual
System Service and Troubleshooting
85108 IF/Detector Option 008 Pulsed-RF IF Path Troubleshooting Flowchart
6-17
Procedure 4: A3 / A4 Pulse Detector IF Path Check
Use this check if:
• Either both reference (a1 & a2) or both (b1 & b2) pulsed-RF IF signal paths look bad.
• Less than three IF paths are bad.
If the connections/setup correct the problem, carry out the instructions in the conclusion column. If
the problem isn’t corrected, proceed to the next step.
NOTE Always return any moved cables to their original connections before proceeding to the
next step.
Step Connections/Setup
Conclusion
(if the problem is corrected)
1 Swap cables W50 & W51. If the problem was in the ref. (a1 &
a2), replace W50. If the problem
was in the test (b1 & b2) path,
replace W51.
2 Move W51 on A2J2 to A2J6.
Move W50 on A2J6 to A2J2.
Move W54 on A16J1 to A16J3.
Move W47 on A16J3 to A16J1.
Move W43 on A16J2 to A16J4.
Move W48 on A16J4 to A16J2.
Go to Step 3.
3
NOTE Do this step only if the problem was
corrected in step 2.
Swap cables W47 & W54.
Swap cables W48 & W43.
If the problem was in the ref. (a1 &
a2) path, determine which cable is
bad (W43 or W54) and replace it. If
the problem was in the test (b1 &
b2) path, determine which cable is
bad (W47 or W48) and replace it.
4 Swap cables W5 & W49. If the problem was in the ref (a1 &
a2) path, replace W5. If the
problem was in the test (b1 & b2)
path, replace W49.
5 Put in a known good A16 board. Replace A16.
6 Put in a known good A17 board. Replace A17.
7 Return to the troubleshooting flowchart.