Cirrus Logic CDB48500-USB - Manual (Page 46)

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Appendix B
Troubleshooting Guide
B.1 Intoduction
This chapter describes many common problems users may have with the CDB48500-USB, possible causes,
and their solutions.
B.1.1 Solutions to Possible Problems
B.1.1.1 Power LEDs are Not illuminated
• DC power supply is not connected to CDB48500 - make sure the DC wall supply is connected to the
DC power input jack (J25), and the supply is plugged into a wall outlet.
• Power selection headers (J17, J18, J19) are set incorrectly - if you are using the DC wall supply
provided with the CDB48500-USB, all jumpers should be in the ‘REG’ position.
If you are using an external power supply for any of the system voltages (5V, 3.3V, 1.8V) make sure that the
jumper for that voltage has been removed and power is applied to the center pin of the appropriate header.
B.1.1.2 CDB48500 is Not Recognized by the PC
• DC power supply is not connected to CDB48500 - the CDB48500 is not a USB-powered device. Make
sure the DC wall supply is connected to the DC power input jack (J25), and the supply is plugged into a
wall outlet
• CDB48500 USB Drivers not installed before connecting to PC - Pull the DC power plug on the
CDB48500,. Open the device manager on the PC and search for the “Opal Kelly” device under “USB
Devices”. 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 automatically find the driver. Wait 3 seconds, and plug DC power
supply back in.
B.1.1.3 Unable to Run a Stereo PCM Application
If after unsuccessfully following the instructions in Section 2.1.4, “Running a Stereo PCM Application on
CDB48500-USB” on page 1-5 , check to see if the following condition exists:
• S/PDIF Source is not connected to SPDIF_RXP - Connect the audio source to SPDIF_RXP, or change
the S/PDIF input to the appropriate connector according to the instructions in
Section 4.2.2, “Changing the
Audio Input Source” on page 4-2 .