8-3 Operating Problems Troubleshooting
8-2 PN: 10580-00307 Rev. D MS20xxC MM
3. The Main PCB may have failed. Replace the Main PCB Assembly.
Boot-up Self Test Fails
The unit boot-up self test fails with an error message:
1. Perform a Master Reset (Press Esc and On/Off key to turn on power to the unit after power off the unit).
2. The Main PCB may have failed. Replace the Main PCB Assembly.
8-3 Operating Problems
Failed Instrument Self Test
1. Main PCB Assembly may be faulty. Replace Main PCB Assembly.
Failed Application Self Test
Vector Network Analyzer Mode
1. VNA PCB Assembly may be faulty or may have been damaged. Replace VNA Module Assembly.
Spectrum Analyzer Mode
1. Spectrum Analyzer PCB Assembly may be faulty or may have been damaged. Replace Spectrum Analyzer
PCB Assembly.
Lock Error Message
Vector Network Analyzer Mode Related
1. VNA PCB Assembly may have damaged. Replace VNA Module Assembly.
2. Check the condition of the 26 MHz Inter-connect cable connections on both the Main PCB and VNA
Module Assembly.
3. Main PCB may have failed. Replace Main PCB Assembly.
Spectrum Analyzer Mode Related
1. This message normally appears for 2 to 3 seconds when an external 10 MHz Reference is applied.
2. Spectrum Analyzer PCB may have failed. Replace Spectrum Analyzer PCB Assembly.
3. Main PCB may have failed. Replace Main PCB Assembly.
Transmission Measurement (S21 and S12) traces noisy after a 2-Port Cal
1. Use another VNA to verify the return loss of both Test Port 1 and Test Port 2 are better than 10 dB.
2. If the return loss is less than 10 dB, then the VNA module input(s) have been overpowered. Replace VNA
Module Assembly.
Inaccurate Amplitude Measurements (Spectrum Analyzer Mode)
1. Inspect the Spectrum Analyzer RF In connector for damage.
2. Spectrum Analyzer PCB Assembly may have damaged or failed. Replace Spectrum Analyzer PCB
Assembly.
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