4-20 Keysight N5221A/22A Service Guide
Troubleshooting
Front Panel Troubleshooting
4-
A1 Front Panel Interface Board
This assembly performs the following functions:
— It routes USB signals between the front-panel USB connector and the A17
CPU board.
— The speaker produces the audio output from signals supplied by the A17
CPU board.
— It routes key pad commands from the keypad to the A17 CPU board.
— It routes display signals from the A17 CPU board to the A3 display
assembly.
Checking the Speaker
If no audio is heard:
— Verify that the volume is set correctly and the proper sound driver is loaded;
do the following:
— Press UTILITY , then , then .
—Click on the Sounds and Audio Devices entry. Follow the normal
Windows procedure to check the sound drivers and volume. If the
audio is still not heard, suspect a faulty speaker. Refer to “Removing
the A1 Front Panel Interface Board and Keypad Assembly” on
page 7-10.
Checking the Operation of the Key Pad Commands
To verify the key pad functionality, refer to “Front Panel Keypad and RPG Test”
on page 4-16.
Checking the Display
To verify the display functionality, refer to “A3 Display Test” on page 4-19.
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