The Sony STR-DB930 is an all-purpose piece of electronics designed to cover several of your home entertainment needs. It acts as an audio/visual receiver to help set up a surround-sound system or to improve sound quality with your television; it also operates as an AM/FM radio. As with all electronics, the STR-DB930 may encounter errors: one such error is "UNLOCK," which will flash across the display when the receiver has trouble locating or receiving a digital audio signal. Thankfully, this error is easily fixed.
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Verify that all cables are properly connected from the digital source to the AV receiver. One reason the receiver cannot detect a digital signal is if the cables have not been correctly plugged in. Audio cords simply have red and white plugs that need to be plugged into red and white outlets, while audio/visual cords have red, white, yellow and black plugs. All outlets are on the back of the receiver, so ensure each colour is plugged into its corresponding outlet.
Press the "Input Mode" button on the front of the receiver to check you have the correct input selected. Each time you press the button, the receiver will cycle through the potential modes of "auto," "digital (optical)," "digital (coaxial)" and "analog." Your digital connection will inform you as to whether you want the optical of coaxial option; if all else fails, select "auto."
Rotate the dial on the front of the receiver to verify the component you selected is the component from which you ought to receive the digital signal. TVs or satellites will show up as "TV/SAT" on the display; DVD players will show up as "DVD/LD"; and CD players display as "CD." If you want to receive a digital signal from the DVD players but have the CD component selected, the receiver will flash the "UNLOCK" message. Sync up the desired component using the knob.
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