Service Guide 6-13
8719ET/20ET/22ET Digital Control Troubleshooting
8719ES/20ES/22ES Front Panel Troubleshooting (A1/A2)
RF Network Analyzers
Front Panel Troubleshooting (A1/A2)
Check Front Panel LEDs After Preset
1. Press on the analyzer.
2. Observe that all front panel LEDs turn on and, within five seconds after releasing
, all but the CHAN and TRANS FWD and REFL FWD LEDs turn off.
• If all the front panel LEDs either stay on or off, there is a control problem between
the CPU board (A7) and the front panel set (A1/A2). See “Inspect Cables” on
page 6-16.
• If you suspect that one or more LEDs are burned out, then replace the keypad
assembly (A1).
NOTE TRANS FWD and REFL FWD LEDs, and TRANS REV and REFL REV LEDs
problems may be caused by the malfunction of the LED board or the transfer
switch
• If, at the end of the turn on sequence, the channel 1 LED is not on and all GPIB
status LEDs are not off, continue with “Identify the Stuck Key” on page 6-14.
Preset
Preset
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