6-6 Service Guide
Digital Control Troubleshooting 8719ET/20ET/22ET
CPU Board (A7) Troubleshooting 8719ES/20ES/22ES
RF Network Analyzers
3. Evaluate results.
• If either of the following LED patterns remain, go to “Display Troubleshooting
(A18,A19)” on page 6-7. (✸ = LED is on).
• If any other LED patterns remain, replace the CPU board (A7) after verifying the
power supply.
✸✸✸ 0 ✸✸ 0 ✸
✸✸✸ 0 ✸✸✸0
(front of instrument ⇓)
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