7-6 Service Guide
Source Troubleshooting 8719ET/20ET/22ET
Start Troubleshooting Here 8719ES/20ES/22ES
RF Network Analyzers
For ES Models:
Disconnect the front panel R CHANNEL jumper.
NOTE For ES Option 089 analyzers, press the following:
Connect the power meter to R CHANNEL OUT and measure the power out.
• If the power level is at least −35 dBm, proceed to “Phase Lock Error Message
Displayed” on page 7-6.
• If the power level is lower, proceed to“Power Not within Specifications” on
page 7-6.
Power Not within Specifications
Perform these power adjustments from Chapter 3 , “Adjustments and Correction
Constants”:
1. “Output Power Adjustments” on page 3-17
2. “Power Linearity Adjustment” on page 3-24
3. “Blanking Adjustment (Test 54)” on page 3-30
• If power holes exist, use the block diagram (located at the end of Chapter 4 , “Start
Troubleshooting Here”) and the location diagrams (in Chapter 13 , “Replaceable Parts”)
to check the cables and connections in the RF path.
• If power levels are not ±2 dB of the setting (8719ET/ES and 8720ET/ES) or ±3 dB of
setting (8722ET/ES) in only one or two bands, go to “Band-Related Problems” on
page 7-22.
• If power levels are incorrect in all bands, go to “Broadband Power Problems” on
page 7-26.
Phase Lock Error Message Displayed
1. To view the 0.25V/GHz signal to the YIG oscillator, press the following:
Notice that for each band, the waveform should start and stop exactly as shown in
Figure 7-1, with only one ramp in each band. A problem in one band should not affect
the appearance of the waveform in other bands.
System
Preset
Preset
System
Meas
9 x1
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