APC H15 Service Manual Page 77

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Users and Service Guide 6-21
Servicing the Test Set
Troubleshooting the Test Set
Troubleshooting the Front Panel Board
Turn the instrument power on and do the following:
Step 1. 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.
Step 2. 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.
Step 3. 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 the board.
Troubleshooting the Controller and Switch Driver
Boards
Turn the instrument power on and do the following:
Step 1. 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.
Step 2. Check the RF paths for connection. If an RF path is not connected to the
necessary port or terminated in 50
, replace the controller and switch
driver board.
A block diagram for the Agilent 87050A Option H15 is provided on the
following page. Refer to Figure 6-1 on page 6-22.
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