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Troubleshooting
Troubleshooting Assembly–Level Problems
201 Tuning + Bias Test
1. Turn power off and remove the A5 Sampler and connect a signal analyzer to the A5 Sampler J1
input cable on the A31 Motherboard.
2. Turn the signal generator on and check for the presence of a 1 GHz signal at the level of 0 dBm.
3. If the signal is good on the cable connector J1, replace the A5 Sampler.
4. If the signal is bad, remove the A7 Reference and ohm the cable between the center pins (a short
should occur) and between the center pins and shielding (an open should occur) of J3 on the A7
Reference and J1 on the A5 Sampler.
5. If an open is measured between the center pins or a short between center pins and the shielding,
replace the cable.
6. If the cable is good, replace the A7 Reference.
202 Coarse Loop Detector
1. Replace the A5 Sampler
203 YO Loop Detector
1. With power on carefully remove the A5 Sampler, connect a signal analyzer to J3 on the A31
Motherboard. Set the signal generator to 8 GHz CW then check for an 8 GHz signal at a power
level greater than or
equal to –7 dBm on J3.
2. If the J3 signal is bad, troubleshoot the A29 20 GHz Doubler using the procedure in the RF path
section. If the J3 signal is good, go to the next step.
3. Connect the signal analyzer to the A6 Frac–N VCO signal on the J6 connection on the A31
Motherboard. With the signal generator set to 8 GHz CW, the A6 Frac–N signal should be at a
frequency of 593.75 MHz and at a power level of +7 dBm.
4. If the signal is good, replace the A5 Sampler, if the signal is bad go to the A6 Frac–N
troubleshooting procedure.
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