4-14 Keysight N5221A/22A Service Guide
Troubleshooting
Power Up Troubleshooting
4-
Figure 4-3 Fan Power Cable Connections
3. If the correct voltage is present at each connection and the fan connectors
are in good mechanical condition, suspect a defective fan. Refer to
“Removing and Replacing the Fans” on page 7-56.
4. If the correct voltage is not present, suspect a defective A14 system
motherboard. Refer to “Removing and Replacing the A14 System
Motherboard” on page 7-18.
Troubleshooting LCD Display Problems
This procedure is intended to isolate the faulty assembly when the display is
dark. If the display is lit, but the color mix is faulty, refer to “A3 Display Test” on
page 4-19.
1. If the display is dim, the A3 display assembly is defective. Refer to
“Removing and Replacing the A1–A3 and Other Front Panel
Subassemblies” on page 7-10.
There are no front panel adjustments for intensity and contrast of the LCD.
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