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5-28
690XXB/691XXB MM
A7 YIG Loop
Error 113 YIG Loop Osc Failed
Error 115 Not Locked Indicator Failed
Description: Error 113 indicates that the YIG loop is not phase-
locked. Error 115 indicates a failure of the not phased-lock indicator
circuit.
Step 1.
Verify the signal output from the A4 Coarse Loop PCB by
performing steps 5 thru 7 in Table 5-11.
q
If the coarse loop signals are correct in both frequency
and amplitude, go to step 2.
q
If the coarse loop signals are incorrect, replace the A4
PCB.
Step 2.
Verify the signal output from the A5 Fine Loop PCB by per-
forming the steps 5 thru 7 in Table 5-9.
q
If the fine loop signals are correct in both frequency and
amplitude, go to step 3.
q
If the fine loop signals are incorrect, replace the A5 PCB.
Step 3.
Disconnect the semi-rigid cable, W31, at output port J5 of
the switched filter assembly.
Step 4.
Set up the 690XXB/691XXB to generate a CW frequency of
2.000 GHz.
Step 5.
Using a spectrum analyzer, measure the frequency and am-
plitude of the signal at J5 of the switched filter assembly.
The frequency should be 2.000 GHz
±
25 MHz and the ampli-
tude should be from –7 to –14 dBm.
q
If the signal is correct in both frequency and amplitude,
go to step 6.
q
If the signals are incorrect, replace the switched filter as-
sembly.
Step 6.
Repeat steps 4 and 5, incrementing the CW frequency in
1 GHz steps up to 20.000 GHz (8.4 GHz for Model 69017B/
69117B).
Step 7.
If the signals from the coarse loop, fine loop, and switched
filter assembly are all correct, replace the A7 YIG Loop PCB.
Table 5-13.
Error Messages 113 and 115 (1 of 2)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
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