1,Problem Without output Solution:Confirming the signal cable works and well connected or not;To make sure PHA1 turns on;Finally If set up a hearable volume.
2,Noise judgement Solution:If you find there is noise when playing music,sometime it is problem from MUSIC original or Amplifier.How to judge it? Please pause your output,if there is no noise without output music,the noise is from Music file.
3,Problem cercerning not able to power on Solution:Confirm the working status of USB cable and 5V USB power input.
If the listed solution can not solve your problem.Kindly email or call us or online chat!
Download
PHA1 download relevant upgrade firmware, manuals, and other useful information, so that your product is functioning optimally