Peavey PRO COMM U1002 - Manual (Page 34)

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5. FUNCTIONS OF LCD DISPLAY
(1) "ERR" Message: When "ERR" appears in the display it indicates that an
operational error has occurred. Please refer to the following codes to
diagnose which error you are experiencing
ERR no01 - EEPROM is not being programmed or internal data error.
ERR no02 - For testing only.
ERR no03 - The frequency you are about to program into the system
exceeds the microphone's frequency upper limit (Ai this time
the microphone is still operable and the frequency remains
unchanged. To clear the "ERR" message in the LCD display,
simply turn off the power and switch back on.).