Service Guide 3-37
8719ET/20ET/22ET Adjustments and Correction Constants
8719ES/20ES/22ES Loading Firmware
RF Network Analyzers
• If any other LED pattern is present, the CPU board is defective.
Loading Firmware into a New CPU
When the CPU board has been replaced in the analyzer, use this procedure to load the
firmware.
1. Turn off the network analyzer.
2. Insert the firmware disk into the instrument's disk drive.
3. Turn the instrument on. The firmware will be loaded automatically during power-on.
The front panel LEDs should step through a sequence as firmware is loaded. The
display will be blank during this time.
At the end of a successful loading, the LEDs for Channel 1 and PORT 1 (REFLECTION
port on ET models does NOT have an LED) will remain on and the display will indicate
the version of firmware that was loaded.
LED Pattern
Chan 1 Chan 2 Chan 3 Chan 4 R L T S
✸
✸✸
✸✸
✸✸ ✸
✸
✸✸
✸✸
✸✸ ✸
✸✸
✸✸✸
✸✸✸
✸✸
✸✸✸
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