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Introduction
If the headphones will not accept a charge from the micro usb cable, the charging port may need to be replaced and the volume dial is soldered onto the circuit board. This process is moderately difficult and may take up to an hour depending on skill level. The only tool necessary will be the #000 Philips screwdriver.
The Circuit board replacement is no longer available, Either Official or 3rd Party.?
If you find one Please update guide with link.
What you need
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Pull the earmuff near the top until the seam starts to pull from the split in the headphone case. Continue until the earmuff fully separates from the headphones as shown.
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NOTE: When re-attaching to the headphone the last few inches have to be stretched, use a blunt opening tool or cotton bud to hook under the membrane and pull into position as you push from the inside with your fingers.
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After removing the muffs, the speaker cover must be removed by unscrewing 4 3mm Phillips screws using a #000 Phillips screwdriver.
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NOTE: Use caution lifting up the black clip, it is very fragile, especially on older headphones.
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Unplug the blue ribbon attaching the circuit board to the motherboard.
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The Ribbon cable is attached to the foam bridge, force may cause it to tear. Replacement cables are not available and will render the headphone useless if you tear it.
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Recommended steps.
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Unclip top connected first
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Unclip Bottom Connector
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Use a paperclip rounded end to push on the cable until the cable detaches from bottom connector.
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To reassemble your device, follow these instructions in reverse order.
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4 Guide Comments
I was also trying to find the replacement module https://spares.sennheiser-hearing.com/ca..., but a Sennheiser agent told me that they're no longer available.
Guess I have a nice pair of wired headphones now.
You are not alone! My headphones just came from the repair shop. I needed to change the sponges and, what I thought, change a faulty battery. Had already bought the spare parts. Everything worked fine for 3 days (while the new battery was full) and then I could not charge it anymore. went back to the shop, they opened the headphones but cannot get a charge signal in the battery, which means that there is no current passing to the battery. I bought an adapter to connect my "nice pair of wired headphones" to my phone.