Cirrus Logic CDB470xx - Manual (Page 85)

7-1 Copyright 2014 Cirrus Logic, Inc. DS886DB11
Troubleshooting Guide
CDB47xxx User’s Manual
Chapter 7
Troubleshooting
7.1 Troubleshooting Guide
This section provides solutions to problems that users might experience when using the CDB47xxx.
7.1.1 Power LEDs
Problem: Power LEDs are not illuminated.
• Possible cause: DC power supply is not connected to CDB47xxx.
Solution: Ensure the DC wall supply is connected to the DC power input jack (J22), and the
supply is plugged into a wall outlet.
• Possible cause: Power selection headers (P1-P3) are not populated.
Solution: If you are using the DC wall supply provided with the CDB47xxx, all jumpers should
installed.
• Possible cause: Jumper settings when using an external power supply are set incorrectly.
Solution: If you are using an external power supply for any of the system voltages (5V, 3.3V,
1.8V), ensure that the jumper for that voltage has been removed and power is applied to pin 2
of the appropriate header.
7.1.2 Board not Recognized by PC
Problem: CDB47xxx is not Recognized by PC
• Possible cause: DC power supply is not connected to CDB47xxx.
Solution: The CDB47xxx is not a USB-powered device. Make sure the DC wall supply is
connected to the DC power input jack (J22), and the supply is plugged into a wall outlet.
• Possible cause: CDB47xxx USB Drivers not installed before connecting to PC.
Solution: Follow these steps:
1. Pull the DC power plug on the CDB47xxx.
2. Open the Windows

Device Manager on the PC and search for the “USBXpress Device”
under “USB Controllers”.
3. If there is a question mark next to the device, right click on it and open “Properties.” Press
the Update Driver button and let Windows

operating system automatically find the driver.
4. Wait 3 seconds, and plug the DC power supply back into the power input jack.