33 Troubleshooting Guide3.1. Troubleshooting Guide* Check the battery voltage before the inspection.3.2. Trial Operation (after checking Troubleshooting Guide)IMPORTANT NOTICE:Delete all pairing memories after repairing.[How to delete all pairing memories]Push the Volume+ - button and Switch at the same time while EY37C5 is turned OFF then you'll hear a beep after 5 seconds → Allpairing memories are deleted.3.2.1. Assembly• Confirm that there is no biting of lead wires and no gaps between housing.• Confirm all screws are tightened firmly.3.2.2. Operation• Play audio and check sound quality and volume control.[How to check audio]Turn ON Bluetooth from smartphone setting while EY37C5 is turned OFF → Press and hold EY37C5 Switch → Confirm that youcan play the music on the device side.• Connect the USB charging cable from the market and the USB device to the right/left USB terminal. Press the USB power supplybutton and check if it starts charging.ᇵTROUBLEᇶᇵCHECKᇶ ᇵREMEDYᇶUSB-connected devicescannot be charged.Confirm that the setting part of the hingeassembly is not out of stock or worn.Refer to Trial Operation 3.2.2 [How to checkaudio].䠫䠧Replace the hingeassembly.NOᇵTROUBLEᇶᇵCHECKᇶNOᇵTROUBLEᇶReplace the mainModule.Refer to Trial Operation. 3.2Re-register Bluetooth and check if you can playaudio after deleting all pairing memories on thedevice.ᇵREMEDYᇶReplace the mainModule or speaker block.The handle does notremain at the set angleNo sound can be heardthrough the speaker.