5-26
690XXB/691XXB MM
A5 Fine Loop
Error 111 Fine Loop Osc 1 Failed
Error 150 Fine Loop Osc 2 Failed
Error 151 Fine Loop Osc 3 Failed
Description: One of the oscillators within the fine loop is not phase-
locked.
Step 1.
Disconnect cable W140 at A5J2.
Step 2.
Using a spectrum analyzer, verify the presence of a 0 dBm
±
3 dB, 10 MHz signal at the end of the cable.
q
If present, go to step 5.
q
If not present, go to step 3.
Step 3.
Disconnect cable W140 at A3J4.
Step 4.
Using the spectrum analyzer, verify the presence of the
0 dBm,
±
3 dB, 10 MHz signal at A3J4.
q
If present, replace the cable W140.
q
If not present, replace the A3 PCB.
Step 5.
Reconnect cable W140 to A5J2 and disconnect cable W138
at A5J5.
Step 6.
Set up the 690XXB/691XXB to generate the CW frequencies
listed in Table 5-10.
Step 7.
Using a spectrum analyzer, measure the frequency and am-
plitude of the signal at A5J5 for each of the CW frequencies
generated. In each case, the signal amplitude should be
+3 dBm
±
3 dB with sidebands at <–65 dBc.
q
If the signals are correct in both frequency and ampli-
tude, go to step 8.
q
If the signals are incorrect, replace the A5 PCB.
Step 8.
Reconnect cable W138 to A5J5 and run self-test again.
q
If error 111 is not displayed, the problem is cleared.
q
If error 111 is still displayed, contact your local Anritsu
service center for assistance.
Table 5-9.
Error Message 111, 150, and 151
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
690XXB/691XXB
CW Frequency
Measured
Frequency at A5J5
8.310 GHz
40 MHz
8.309 GHz
31 MHz
Table 5-10.
Fine Loop Frequencies
Summary of Contents for 680 C Series
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