The Singing Machine SMC4TV Instruction Manual page 24

Troubleshooting Guide
No sound from the microphone
• Make sure it is firmly connected to the MIC1 or MIC2 jack.
• Make sure it is turned on, see page 9 (Information column).
• Make sure the MIC VOLUME Menu option is not on the lowest setting.
File(s) on USB jack not playing
• The file is corrupted; replace file.
• The file is not in a format this unit will play.
• The connected USB device is not supported by the product.
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