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Help me, who knows the reading lang K9 morning education machine, and it doesn't make a sound? What should I do? Thank you! !
1, the battery may be dead. Replace the battery.

2. Minimize the volume and increase the volume.

3. No card is inserted, or the card is not inserted correctly. Insert the card in the correct way.

4, the machine is broken, sent to the sales outlets for maintenance, and all major bookstores basically sell reading lang learning machines.

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