Jabra is a wholly-owned subsidiary of GN Netcom A/S. Its headquarter is located in Copenhagen, Denmark. Its main business includes earphones products, hands-free phones, video conferencing related products, and audio and video solutions for individuals and businesses. Jabra has an early layout in the bluetooth earphones market, with rich product types, and a good reputation and sales in overseas markets.
In other respects, Jabra ELITE 85t has a single battery life of about 5.5 hours with active noise reduction turned on, and a total battery life of about 25 hours with a charging case. The charging case supports Qi standard wireless charging function; in addition, the earphones also supports IPX4 waterproof, reducing There is a risk of rain and sweat damaging the earphones. At the same time, Jabra also provides a 2-year extended warranty for dust and water resistance. Let’s take a look at the detailed dismantling report!
| 1. Jabra ELITE 85t charging case teardown
After unpacking the box, we have a comprehensive understanding of the appearance of Jabra ELITE 85t. The design style is relatively simple and stable. Next, we will enter the disassembly process to see which components are used in the product.
First, disassemble the charging case, pry open the charging cockpit, and find that the shell is made of soft rubber.
The charging cockpit is made of soft rubber, which can be deformed by hand squeezing.
Inside the charging cockpit, the shell is fixed by a buckle. There is a magnet on each side of the left and right earphones to magnetically fix the earphones. There is a slender magnet on the metal shaft for the Hall switch to realize the function of opening and connecting the earphones.
The internal structure of the charging case, the motherboard is fixed by screws.
The location of the Hall element FPC. Below the shell is the charging interface, the interface is wrapped with a black rubber cover, and the joint is sealed with a circle of white glue.
The Hall element FPC is connected to the motherboard through a connector.
Connect the battery wires and sockets.
There is a cushion foam at this position.
Open the buffer foam and find that there is an IC underneath, there is a heat dissipation pad outside the IC, and there is a thermal conductive copper foil outside the heat dissipation pad to facilitate heat dissipation.
A large area of heat-dissipating copper foil on the inside of the casing specifically dissipates heat for this charging chip.
The bottom of the charging case is the battery and the wireless charging receiving coil, and the battery is covered with a piece of buffer foam.
Charging case The light guide of the front indicator.
Take out the internal circuit structure of the charging case.
On the other side of the charging case internal circuit, there are two cushioning foams on the main board, and a cushioning pad between the battery and the main board.
The battery is fixed on the shielding paper of the wireless charging receiving coil by double-sided tape.
On the side of the battery is a QR code label.
Soft pack battery information, model 902232U, rated capacity 2.93Wh/770mAh, rated voltage 3.8V.
The battery protection board has a thermistor to detect the battery temperature, and the left side is a PTC to prevent battery overcurrent.
A plastic sheet in the middle of the wireless charging receiving coil is level with the coil.
Wireless charging receiving coil, single-strand enameled wire winding.
Motherboard circuit.
The other side of the motherboard circuit.
Screen printing X2G Hall element. The change of the magnetic field at the position of the shaft will be sensed by the Hall element, and the charging case will be notified to match or disconnect the MCU and earphones with the connected device. Above the Hall element is a TVS to prevent electrostatic breakdown of the device.
A close-up of the USB Type-C charging interface. There is a rubber protective sleeve on the periphery, and the joints are sealed with glue to prevent dust and water.
Gold-plated Pogo Pin for charging earphones.
An RGB LED indicator.
The linear charging chip of MPS uses I2C interface configuration.
The step-up IC of the silk screen 1SOU boosts the battery in the charging case to charge the earphones.
The MOS tube of silk screen P5 is used for wired and wireless power supply switching.
IC with silk screen 427790.
TI BQ51003 wireless receiver power supply, in line with WPC V1.2 standards, is optimized for 2.5W applications. The overall peak AC/DC conversion efficiency is 93%. It integrates a fully synchronous rectifier, a low-dropout regulator, digital control, and accurate voltage and Current loop, used for earphones wireless charging and receiving.
The zener tubes of silk screen D28 and M33.
ST STM32L072CB low-power MCU, based on Arm Cortex-M0+ 32-bit RISC core, with a frequency of 32 MHz, built-in memory protection unit (MPU), high-speed embedded memory (up to 192 KB of flash memory, 6 KB of EEPROM and 20 KB of SRAM ) And various enhanced I/O interfaces.
STMicroelectronics STM32L072xB detailed information.
| 2. Jabra ELITE 85t earphones teardown
Let’s continue to disassemble the Jabra ELITE 85t earphones. The earphones are bean-shaped in-ear design. There are multiple dot matrix openings on the shell, which looks simple and capable.
The earphones is controlled by buttons, and the Jabra brand name is on the shell of the button position.
The dot matrix pickup hole of the call microphone.
The feed-forward microphone pickup hole on the top of the fuselage collects ambient sound for active noise reduction and call noise reduction.
The dot matrix pressure relief hole at the rear of the fuselage.
The dot matrix pressure relief hole at the bottom of the fuselage.
The two charging contacts on the inside of the earphone are marked with L/R nearby.
The sound mouth can see the components inside, and the dust-proof protection net is equipped with silicone eartips.
Disassemble the earphone shell along the parting line.
The components in the sound cavity are connected to the PCBA on the battery through the FPC, and there is a foam buffer on the FPC.
There is a ring of white glue around the speaker unit to seal and fix the inside structure of the housing at the ear.
The wire of the speaker unit is connected to the FPC through the connector.
The copper pillar for charging the earphone battery is connected with a metal dome on the battery PCBA.
Take out the speaker unit, you can see that the FPC in the sound cavity is connected to the back-feed microphone of the earphones.
The loudspeaker unit is fixed on a transparent bracket, and there is a dust-proof net at the internal pressure relief hole.
The diaphragm of the dynamic speaker unit has a metal vapor-deposited dome.
The size of the speaker unit is about 12mm, consistent with the official publicity.
Laser carving CN20 8J04’s MEMS silicon microphone is used to pick up the sound in the ear canal, assist active noise reduction and call noise reduction.
In the structure inside the earphone shell, the colors of the plastic brackets for fixing the battery of the left and right earphones are different.
Take out the structure that holds the battery and motherboard.
Inside the earphone shell, the upper right corner is an opening for the hidden indicator light.
Dust-proof net at the position of the call microphone.
The LDS antenna is integrated in the housing for transmitting wireless signals.
The structure design of the earphone shell.
The decorative shell is fixed with glue.
The earphones shell, the dark gray ring surrounding the physical buttons is the earphones’s LDS bluetooth antenna.
The earphone motherboard and battery structure are compared with the size of RMB coins.
On the side of the earphones mainboard and the battery structure, the two mainboards are connected by FPC.
On the other side of the earphones motherboard and battery structure, there is a metal protective cover outside the chip and two microphone openings.
There is cushion foam between the side of the support structure and the shell.
The two main boards use a soft and hard board to reduce the volume.
The position of the Near Field Magnetic Induction (NFMI) coil is soldered on the lead out circuit board.
The internal circuit of the earphone.
The size comparison of button cell and holder with RMB coin.
One side of the button battery is a QR code label.
The button battery comes from MIC-POWER, model M1254S3, with a diameter of 12mm, a thickness of 5.4mm, a rated voltage of 3.7V, and a rated capacity of 0.259Wh.
52audio learned that at present, 2336321, Edifier, vivo, Klipsch, Meizu, JEET, VIDVIE and other brands of audio products have adopted a large number of MIC-POWER button batteries.
One side of the motherboard circuit.
On the other side of the motherboard circuit, the metal dome on the left and right boards are the positive and negative contact points of the battery.
Let’s first take a look at the PCBA where the main control chip is located. The picture shows the metal dome connecting the LDS antenna.
Jog button.
LED indicator.
There is also a metal shield on the other side of the main board with an insulating film between it and the battery, and the circuit is also covered with a layer of protective material.
This layer of protective material can be taken out completely.
Complete circuit.
Laser carving 11160 MEMS silicon wheat.
Laser carving CN20 8J14 MEMS silicon microphone.
The external memory of Silkscreen 6AJI QOP is used to store bluetooth configuration information.
Silkscreen 73KU IC.
Cut this metal shield.
The main control chip of Jabra ELITE 85t true wireless noise reduction earphones is Qualcomm QCC5126. Qualcomm QCC5100 series chips integrate digital active noise cancellation technology, quad-core processor architecture, built-in dual-core DSP audio subsystem, and low-power design.
According to 52audio, TWS earphones including BOSE, SONY, 1MORE, Edifier, vivo and other brands have adopted Qualcomm solutions.
NXP NxH2281 Near Field Magnetic Induction (NFMI) single-chip solution for wireless audio and data streaming between two earphones. NFMI is different from radio frequency. It can penetrate the human body, has very low radiation, and has a transmission rate of up to 596 kbit/s. It has the characteristics of low power consumption, stability and durability, and high safety.
NXP NxH2281 detailed information.
Electromagnetic coil for near-field magnetic induction (NFMI).
Cut another metal shield.
The PMIC of the silk screen D3781 provides power for each chip on the earphones.
Let’s take a look at the chip on another PCBA. The picture shows the two metal dome connecting the charging copper pillar.
The IC of Y7 silk screen.
The IC of the silk screen COAA.
Part of the circuit.
The IC with silkscreen 427790 has the same model on the charging case circuit.
Integrated battery protection IC.
All components of Jabra ELITE 85t ANC active noise reduction true wireless earphones.
| Summary
Jabra’s true wireless earphones are simple and stable in appearance design and color matching, and have some business styles. Their earphones are all bean-shaped in-ear designs, and are characterized by multiple dot matrix openings on the shell. The ELITE 85t is Jabra’s first true wireless earphones that supports ANC’s active noise reduction function. 52audio found some unusual designs during the disassembly process.
The Jabra ELITE 85t charging cockpit is made of soft rubber material, which can be deformed by hand squeezing. It is relatively simple to disassemble for individuals, but frequent disassembly may affect the use; the charging case is designed with a complete heat dissipation measure for the charging chip, including a heat dissipation pad And the large-area thermally conductive copper foil inside the shell; the position of the Hall element is designed at the metal shaft instead of the opening and closing of the common box cover.
In terms of internal circuits, the Jabra ELITE 85t charging case inputs power through the USB Type-C interface, and uses MPS linear charging chip to charge the battery. The charging case supports Qi standard wireless charging. TI BQ51003 is responsible for wireless charging and receiving, while charging the battery. A MOS tube is used for wired and wireless power supply switching, a boost IC boosts the battery output to charge the earphones, and the ST STM32L072CB low-power MCU is responsible for the whole machine control. Charging case The capacity of the built-in soft pack battery is 770mAh, and the overall volume and weight are well controlled.
In the earphone part, the dust-proof net and eartips of the Jabra ELITE 85t mouthpiece are designed in one piece, so you need to be careful and fast when replacing it; the earphone adopts button control instead of touch; there is a bracket in the earphone to fix two motherboards and button batteries, bluetooth audio SoC and power management chip are protected by a metal shield, with an insulating film between the shield and the battery, and a layer of protective material on the circuit; the dynamic speaker unit of the earphone uses a metal vapor-deposited dome diaphragm, the size is about 12mm; 1254 The button battery comes from MIC-POWER, with a capacity of 0.259Wh and about 70mAh.
The right earphone of Jabra ELITE 85t is the main earphone, the main control chip is Qualcomm QCC5126, which is connected to the mobile device through the LDS antenna, and the left and right earphones transmit wireless audio and data streams through the NXP NxH2281 near-field magnetic induction (NFMI) single-chip solution. The Qualcomm chip in the earphones may be used to assist in active noise reduction, sound processing and other functions. The earphones uses a feed-forward microphone + feed-back microphone hybrid noise reduction solution, and a call microphone forms a three-mic call noise reduction solution.
By querying Jabra’s official website, it is known that many Jabra’s true wireless earphones, including Jabra ELITE 85t, all adopt a forwarding scheme. The right earphone is the main earphone, and the left earphone cannot be used alone. Compared with the mainstream true wireless earphones on the market, the Jabra ELITE 85t has unique structural design and materials, and the extended warranty service is also very considerate. It is a good choice for consumers with sufficient budget.
Source: 52audio
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2 Comments
Thank you for the detailed teardown on Jabra ELITE 85t.
Thank you so much, my case had a charging pin come loose resulting in an unchargeable earbud. Just finished repairing it in confidence thanks to this teardown.