The story of my KZ Bluetooth receiver, AZ09, where only the right side stopped working, and how I fixed it
I am someone who truly loves KZ Chinese earphones, but
there are many situations where wired earphones are just inconvenient,
so I use a Bluetooth receiver that can turn them into wireless earphones.
I am using the AZ09.
I bought it in 2024, and it has already been over two years. Time flies.
It uses Bluetooth 5.2, the connection is reasonably strong, and I haven't felt any inconvenience.
You can enjoy the signature KZ V-shaped sound and high-resolution audio quality.
Somehow, only the right earphone is making a warning sound
When I put them on as usual, I heard some kind of warning message only in my right ear.
Sadly, I don't know Chinese, so I don't know what the warning was about.
When I checked on my smartphone, the battery was at 20%.
I assumed it was a low battery warning, so I charged it that day and finished.
Nothing can be heard from the right earphone only
Thinking the charging was complete, I opened the lid and
from the left earphone, I heard the usual voice message that sounds like 'teiau, teineteichi, teineteichi'.
With a bad feeling, I turned it on, but I couldn't even hear the warning anymore, and the LED light on the right earphone wasn't lit either; this gives me a bad feeling.
When I put them on, I can hear the left earphone, but I can't hear the right one at all.
Looking closely, the LED light is not lit at all.
The left one blinks blue periodically, but the right one does nothing.
Even when I put them back in the case and open the lid, the left one's LED lights up, but the right one doesn't.
1. Maybe it's not charging due to a poor connection
The first thing I thought was, maybe it's not charging properly?
The initial warning seemed like it was a low battery, so there is a possibility that it wasn't charging well after that.
I cleaned the contact points and tried pushing them in firmly.
→ No change
2. Maybe the Bluetooth connection isn't working well
It might not be syncing with the smartphone.
I'm concerned that the LED light isn't on, but I'll try deleting the Bluetooth connection from the smartphone side and reconnecting it.
→ No good
3. Attempt a factory reset
https://www.reddit.com/r/headphones/comments/s4424b/comment/i4lybwx/
I will try the factory reset found in this thread.
The thread is about the AZ09 Pro, not my AZ09, and the conditions are different, such as the blue LED blinking continuously, but the goal is the same.
1. First, delete the pairing with the smartphone.
2. Put the earphones in the case and press and hold the physical buttons on each ear hook simultaneously for 15 seconds or more. (This seems to be the reset)
3. Close the lid.
Oh, wow.
The right earphone, which had no reaction until just now, now has its LED light lit properly.
When I tried it, I could hear it properly.
It was solved quite easily.
Please try this if you have a problem with only one side of your KZ wireless receiver.
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