690XXB/691XXB MM
5-23
Power Supply Not Phase-Locked
Error 106 Power Supply not Locked
Description: The switching power supply is not phase locked to the
400 kHz reference signal from the A6 Square Wave Generator PCB.
Step 1.
Using an oscilloscope, verify the presence of a 400 kHz TTL
square wave at TP4 on the A6 PCB.
q
If present, replace the A18 Power Supply PCB.
q
If not present, go to step 2.
Step 2.
Using an oscilloscope, verify the presence of a 10 MHz TTL
signal at J3 of the A5 Fine Loop PCB.
q
If present, go to step 3.
q
If not present, go to step 4.
Step 3.
Check the cable, W108, that goes between A5J3 and A6J1.
q
If the cable is good, replace the A6 PCB.
q
If the cable has failed, replace it.
Step 4.
Using a spectrum analyzer, verify the presence of a 0 dBm
±
5 dB, 10 MHz signal at J4 of the A3 Reference Loop PCB.
q
If present, go to step 5.
q
If not present, replace the A3 PCB.
Step 5.
Check the cable, W136, that goes between A3J4 and A5J2.
q
If the cable is good, replace the A5 PCB.
q
If the cable has failed, replace it.
Table 5-6.
Error Messages 105 and 106 (9 of 9)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
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