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 | Item | Check Point | Remedy/Remarks | 
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 | Power cable | Check for loosened or corroded | Clean and tighten. | 
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 | connection at power terminals. | 
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 | Battery | Check that the battery is fully charged. | If discharged, charge. | 
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 | Feeder (coax | Check for physical damage. | Replace if damaged. | |
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 | cable, control | 
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 | cable) | 
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 | PCB connection | Check that jumper cables between boards | Reconnect loosened connections | 
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 | are firmly connected. | of jumper cables. | 
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 | Microphone | Check that jumper cables between boards | Fasten if loosened. | 
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 | are firmly connected. | 
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