User`s guide

User’s and Service Guide 49
87050A Option K24 Troubleshooting and Block Diagram
Troubleshooting the Front Panel Board
Turn the instrument power on and confirm the following:
Step 1. Verify 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.
Step 2. If the LCD indicates a wrong path, the problem can lie either with the front panel
board or with the main switch board. Measure the RF path to determine where
the problem is.
Step 3. If the LCD does not display the proper path, confirm 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.
Step 1. Confirm the condition of each of the switching paths by issuing commands to
switch each of the paths to either the Transmission or Reflection path.
Step 2. Verify each of the RF paths for connection.
Step 3. If an RF path is not connected to the necessary port or terminated in 50 Ω,
replace the controller and switch driver board.