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Introduction

A look inside the Technics EAH-AZ70 (Japan) / EAH-AZ70W (Outside Japan) Bluetooth Headphones

This teardown is not a repair guide. To repair your Technics EAH-AZ70 (Japan) Bluetooth Headphones, use our service manual.

  1. Features: Highest Level of Dual Hybrid Noise Cancelling.  Multiple MEMS microphones Graphene coated PEEK diaphragm speaker for smooth, clean, and elegant sound
    • Features:

    • Highest Level of Dual Hybrid Noise Cancelling. Multiple MEMS microphones

    • Graphene coated PEEK diaphragm speaker for smooth, clean, and elegant sound

    • Stable Connection in crowed areas

    • Excellent Quality Call Sound

    • Approximately 6.5 hours of playback, and up to 20 Hours of use with charger

    • Bluetooth® 5.0

    • Capacitive touch sensor control

    Great teardown.

    Steve Profit - Reply

  2. What is in the box Headphones / Charging Case USB 'C' Cable
    • What is in the box

    • Headphones / Charging Case

    • USB 'C' Cable

    • Headphone rubber tips for different sizes of ears

    • User's Manual

  3. Charging case with headphones Close up view of headphones Close up view of headphones
    • Charging case with headphones

    • Close up view of headphones

  4. Side views of Headphone Charger Interface USB Interface
    • Side views of Headphone

    • Charger Interface

    • USB Interface

    • Speaker Sound Port

    • MEMS Microphones

    • Speaker Vent

    • Vent Port

    • Speaker Spatial Vent Port

  5. View of Headphone with rubber ear piece removed Vent Port
    • View of Headphone with rubber ear piece removed

    • Vent Port

  6. Since the Technics Headphone enclosure is glued together, the only way in was to cut into the headphone. This is a destructive teardown A Razsor knife was use to cut into the Technics headphone along the seam in the headphone.  Then a Jimmy Tool was used to open up the headphone. Tweezers and a Pick Tool were used to removed the electronics from the enclosure
    • Since the Technics Headphone enclosure is glued together, the only way in was to cut into the headphone.

    • This is a destructive teardown

    • A Razsor knife was use to cut into the Technics headphone along the seam in the headphone. Then a Jimmy Tool was used to open up the headphone. Tweezers and a Pick Tool were used to removed the electronics from the enclosure

    • Once opened, we get our first look at the inside of the headphone

    • Double sided foam tape was used to hold the main the PCB to the Battery and to the Touch Sensor / Antenna PCB. This foam tape had to be cut free. Then Denatured Alcohol was used to remove the foam tape glue from the PCBs and Battery

    • Double Sided Foam Tape

  7. Opening up the headphone, we can see the main PCB, Battery, Speaker, etc Battery Main PCB
    • Opening up the headphone, we can see the main PCB, Battery, Speaker, etc

    • Battery

    • Main PCB

    • Speaker

    • Speaker Sound Chamber

    • Touch Sensor and Antenna

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  9. At first, I wasn't sure about the solder balls. Then I realized they were used to anchor the USB and Power Interface pins on the outside of the Headphone to the internal circuit board. I had to used a solder iron to remove the solder balls, so that the internal interface circuit board could be removed.  I had to also remove solder from the speaker wires to free up the internal circuit board. Internal Circuit Board that interface Power and USB to the Headphones
    • At first, I wasn't sure about the solder balls. Then I realized they were used to anchor the USB and Power Interface pins on the outside of the Headphone to the internal circuit board.

    • I had to used a solder iron to remove the solder balls, so that the internal interface circuit board could be removed. I had to also remove solder from the speaker wires to free up the internal circuit board.

    • Internal Circuit Board that interface Power and USB to the Headphones

  10. The internal circuit board was also attached a MEMS Microphone that appeared to be monitoring the Speaker Chamber of the Headphone, since it was faced in I had to remove the outside panel with 'R' on it with a Razor Knife to free the MEMS Microphone. Once the MEMS Microphone was freed, the interface board circuit could be pulled out USB and Power (Charger) Interface
    • The internal circuit board was also attached a MEMS Microphone that appeared to be monitoring the Speaker Chamber of the Headphone, since it was faced in

    • I had to remove the outside panel with 'R' on it with a Razor Knife to free the MEMS Microphone. Once the MEMS Microphone was freed, the interface board circuit could be pulled out

    • USB and Power (Charger) Interface

    • Sound Ports

    • Internal Circuit Board that interface Power and USB to the Headphones

    • MEMS Microphone from plastic collar in the Headphone

    • MEMS Microphone separated from the Interface Circuit Board when removed from the side of the Speaker Chamber

  11. There was not much to see on the internal interface board top side or bottom side.  The was one IC component that could not be crossed. If you happen to know the component, please leave a comment below Unknown Component
    • There was not much to see on the internal interface board top side or bottom side. The was one IC component that could not be crossed. If you happen to know the component, please leave a comment below

    • Unknown Component

  12. Full Sensor Flex/Charging PCB IC Identification: You may need to enlarge the picture to view the text.
    • Full Sensor Flex/Charging PCB IC Identification:

    • You may need to enlarge the picture to view the text.

  13. Next the Speaker sound chamber cover was removed with the use of a Pick Tool and Tweezers. A Razor Knife was used to cut the glue holding the speak in place The speaker had no identifiable markings With Speaker removed, we can see the sound chamber and sound ports
    • Next the Speaker sound chamber cover was removed with the use of a Pick Tool and Tweezers. A Razor Knife was used to cut the glue holding the speak in place

    • The speaker had no identifiable markings

    • With Speaker removed, we can see the sound chamber and sound ports

  14. Closeup view of the Battery Li-Ion 3.7V, 0.32Wh
  15. Closeup view of the Antenna/Touch Sensor side of the Main PCB DSP Group - C2A1A Hybrid Active Noise Cancellation (ANC) Codec and Audio Digital Signal Processor (DSP)
    • Closeup view of the Antenna/Touch Sensor side of the Main PCB

    • DSP Group - C2A1A Hybrid Active Noise Cancellation (ANC) Codec and Audio Digital Signal Processor (DSP)

    • 651DF1M9 - Could not cross part number, but during a web search found out that it may be an integrated battery management IC

    • W25Q32JWUUIMTR- SPI FLASH 32Mb

    • MEMS Microphone Port

  16. Closeup view of some of the components on the Antenna/Touch Sensor side of the Main PCB DSP Group - C2A1A Hybrid Active Noise Cancellation (ANC) Codec and Audio Digital Signal Processor (DSP) Winbond-W25Q32JWUUIMTR SPI FLASH 32Mb
    • Closeup view of some of the components on the Antenna/Touch Sensor side of the Main PCB

    • DSP Group - C2A1A Hybrid Active Noise Cancellation (ANC) Codec and Audio Digital Signal Processor (DSP)

    • Winbond-W25Q32JWUUIMTR SPI FLASH 32Mb

    • 651DF1M9 - Could not cross part number, but during a web search found out that it may be an integrated battery management IC

  17. Battery side close up view of the Main PCB AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual ModeNew line.
    • Battery side close up view of the Main PCB

    • AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual ModeNew line.

    • 913 MPS1 MEMS Microphone. The Headphone uses three MEMS microphones with this part number

    • Could not cross the part number. If you know the part, please leave a comment below. The 2D bar code on the part reads as STM9135G15JAS011

    • Crystal Oscillator

    • Unknown component. Labelled B2A. Please leave a comment if you happen to know this component

    • Unknown component. Labelled SV4CP 240. Please leave a comment if you happen to know this component. Separated from PCB during teardown

  18. Closeup view of some of the components on the Battery side of the Main PCB AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual Mode 913 MPS1 MEMS Microphone.  The Headphone uses three MEMS microphones with this part number
    • Closeup view of some of the components on the Battery side of the Main PCB

    • AIROHA AB1552 - ARM Cortex M4/Bluetooth 5.0 Dual Mode

    • 913 MPS1 MEMS Microphone. The Headphone uses three MEMS microphones with this part number

    • Could not cross the part number. If you know the part, please leave a comment below. The 2D bar code on the part reads as STM9135G15JAS011

    • Unknown component. Labelled SV4CP 240. Please leave a comment if you happen to know this component. Separated from PCB during teardown

  19. Closeup view of top and bottom side of the Touch Sensor Flex PCB and Antenna Closeup view of top and bottom side of the Touch Sensor Flex PCB and Antenna
    • Closeup view of top and bottom side of the Touch Sensor Flex PCB and Antenna

  20. Full Main PCB IC Identification: You may need to enlarge the picture to view the text.
    • Full Main PCB IC Identification:

    • You may need to enlarge the picture to view the text.

  21. Predicted Block Diagram of the Technics EAH-AZ70 (Japan) Bluetooth Headphones:
    • Predicted Block Diagram of the Technics EAH-AZ70 (Japan) Bluetooth Headphones:

    • You may need to enlarge the picture to view the text.

  22. Teardown Exploded View of the Technics Headphone Teardown Exploded View of the Technics Headphone Teardown Exploded View of the Technics Headphone
    • Teardown Exploded View of the Technics Headphone

Robert Shuler

Member since: 03/12/2019

1,705 Reputation

8 Guides authored

One Comment

If you can, can you post the teardown of the charging case too?

Chunglin Chin - Reply

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