Agilent Technologies Option H48 Multiport Test Set Z5623A - Manual (Page 128)

8 -6 Agilent Technologies Z5623A Option H48
Service
Troubleshooting
Troubleshooting the Front Panel Board
Turn the instrument power on and check the following:
• Check the condition of each of the switching paths by issuing
commands to switch each of the paths to either the transmission or
reflection path. Ensure that the LCD indicates the appropriate path.
• If the LCD indicates a wrong path, the problem can lie with either
the front panel board or the main switch board. Measure the RF
path to determine where the problem is.
• Ensure that the front panel washers between the board and front
panel assembly are present. Missing washers can cause erratic LCD
behavior.
• If the LCD does not display the proper path, check to see if the RF
path has indeed been switched. If the problem lies with the front
panel board, replace it.
Troubleshooting the Controller and Switch Driver
Boards
Turn the instrument power on. Check the condition of each of the
switching paths by issuing commands to switch each of the paths to
either the Reflection or Transmission path. Check each of the RF paths
for connection. If an RF path is not connected to the necessary port or
terminated in 50
Ω, replace the controller and switch driver board.