E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
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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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