BSS Audio OPAL Series DPR-422 Owner's Manual - Manual (Page 28)

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Troubleshooting
10.0 Troubleshooting
Problem: No output.
Solution: Is the Mains Power connected?
Check the connections. See fuse failure (below).
Do you have an input signal?
Check the Input and Output connections.
Are the power amplifiers switched on?
Problem: Fuse failure.
Solution: The mains supply fuse is unlikely to blow without an electronic fault being
present. If the CORRECT replacement fuse blows again at switch on or after a
short interval, switch off the unit and arrange for servicing.