Most likely your digital board is bad. Try this: turn the unit on, hold the display button and press power, there should be some front panel buttons that are + and -, press these to cycle through showing the different firmware versions. It should start out at MAIN the next one should be DSP, if the DSP shows nothing but ?????????, than Q3001 on the digital board is bad and you will need to replace the board
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Most likely your digital board is bad. Try this: turn the unit on, hold the display button and press power, there should be some front panel buttons that are + and -, press these to cycle through showing the different firmware versions. It should start out at MAIN the next one should be DSP, if the DSP shows nothing but ?????????, than Q3001 on the digital board is bad and you will need to replace the board