How to Repair OnePlus Bullets Z2 - E305A Neckband Color through Repair and Battery or Charging Repair Description and On/Off Problem Or Dead Problem Solution And Extra Repair Helping Details and More Repair Information Are Here.
Repair OnePlus Bullets Z2 Neckband
Left Side Headphone Repair Guide
Wiring by Wire Color
L+ (Speaker Positive): Blue Wire
L- (Speaker Negative): Green Wire
H- (Hall Effect Sensor Negative): Black Wire
Hall (Hall Effect Sensor): Brown Wire
H+ (Hall Effect Sensor Positive): Red Wire
Wiring by Connection Points
L+: Connects to the left side speaker positive terminal.
L-: Connects to the left side speaker negative terminal.
H-: Hall Effect Sensor’s negative terminal.
Hall: Hall Effect Sensor signal input/output.
H+: Hall Effect Sensor’s positive terminal.
Left Side Connection Image
Left Side Repair Instructions
Step 1: Check the continuity of each wire using a multimeter to ensure there are no breaks or cuts. Sometimes, these small wires can tear inside, causing connection issues.
Step 2: Visually inspect the components near the connection points. If you notice any missing components, replace them with similar ones or use jumper wires.
Step 3: Perform a Hall Sensor test by measuring its output and confirming that the values fluctuate as expected when a magnetic field is introduced or removed. If the sensor is faulty, replace it with a compatible Hall sensor.
Left Side / Main Board Side Connection Image
Right Side Repair Guide
Wiring by Wire Color
B+ (Battery Positive): Red Wire
B- (Battery Negative): Brown Wire
NTC (Negative Temperature Coefficient Sensor): Brown wire with blue stripes
R+ (Right Speaker Positive): Black Wire
R- (Right Speaker Negative): Green Wire
Wiring by Connection Points:
B+: Battery's positive terminal.
B-: Battery's negative terminal.
NTC: Connects to the temperature sensor responsible for monitoring battery temperature.
R+: Right side speaker positive terminal.
R-: Right side speaker negative terminal.
Right Side / Battery Side Connection Image
Right Side Repair Instructions
Step 1: Check all wires for continuity to ensure no breaks. Inspect for any damaged wire sections, such as frayed insulation or kinks.
Step 2: Inspect nearby components (resistors, capacitors, etc.). If any component is damaged or missing, replace it.
Step 3: Test the NTC (Negative Temperature Coefficient) sensor by measuring resistance across it. Resistance should decrease as the temperature rises.
Step 4: Test the battery connections for secure contact.
On/Off Problem Or Dead Problem Solution
Step 1: Check if the battery is charged.
Step 2: Test the connection between the battery and the main board. Ensure no loose connections exist.
Step 3: Measure the voltage on the Hall sensor to confirm it's working.
Step 4: Check the power switch using a multimeter for continuity and voltage readings. Ensure the switch is mechanically functional.
Step 5: Test the charging port to ensure it's functioning properly.
Step 6: Verify that the Hall sensor is operational. Replace the Hall sensor if necessary.
Step 7: Check for any components near the sensor that might be damaged.
Step 8: Replace any faulty components.
Step 9: Test the power switch's voltage; you should read around 2.8V or higher.
How to Fix And Repair Mic Problem
Step 1: Check the mic for rust or corrosion.
Step 2: Check the wiring between the microphone and the main board.
Step 3: Measure the voltage between the power IC and the mic to verify proper voltage levels.
Connectivity Problem Solution
If the device is having issues connecting via Bluetooth, follow these steps:
Step 1: Check for rust or corrosion on the antenna wire. Corrosion can inhibit signal transmission.
Step 2: Test all surrounding components for proper values and continuity.
Step 3: Inspect or replace the Bluetooth IC (
BES2300) if there is no improvement.
Step 4: Resolder or replace the crystal oscillator IC, as this controls frequency stability, crucial for Bluetooth connectivity.
Sensor Problem Solution
If the sensors are causing issues like erratic on/off behaviour or pairing problems, follow these steps:
Step 1: Inspect all sensor wires (Hall Sensor) for damage.
Step 2: Check nearby components for any damage or missing parts. Use a jumper wire to connect the appropriate pads if components are missing or damaged.
Step 3: Perform a Hall Sensor test or replace it with a known working one. You can measure the output of the Hall sensor using a multimeter in voltage mode.
Hall Sensor Connection Image
How to Fix And Repair Charging Problem
If the device is not charging, you can follow these steps:
Step 1: Check the wire connections to ensure the wires are intact.
Step 2: Inspect the charging connector for physical damage.
Step 3: Test the battery connection to make sure the battery contacts are not loose.
Step 4: Check the nearby components for missing or damaged parts. Replace them if needed.
Battery Problem Solutions
Step 1: Check if the battery wire connections are secure.
Step 2: Measure the battery voltage; it should be between 3.8V and 4.4V.
Step 3: Replace the battery if the voltage is outside this range or the battery is faulty.
Charging Time Load Ampere Image
Extra Information
➔ This Neckband LED will Glow red Color during charging. ➔ This Neckband 2 headphone magnet will flash a White Color LED when removed. ➔ When the This Neckband Bluetooth is turned on, its white LED light will be blinking.
Frequently Asked Questions (FAQs)
How to Power On OnePlus Bullets Z2 - E305A Neckband?
Removing both magnets and pressing the power button turns the device on with a white blinking light.. then on the OnePlus Bullets Z2 - E305A Neckband.
What are the wire colours for the left speaker's positive and negative terminals?
The left speaker positive terminal (L+) uses a blue wire, and the negative terminal (L-) uses a green wire.
left-speaker left-speaker how do you test for wire continuity?
Use a multimeter to check each wire for breaks or cuts, ensuring that the electrical connection is intact.
What is the purpose of the Hall Effect sensor in the neckband?
The Hall Effect sensor detects magnetic fields, which can be used for functions like power management and play/pause actions.
What colour wire connects to the right side speaker's positive terminal?
The right speaker positive terminal (R+) is connected by a black wire.
What steps should be taken if the neckband is not turning on?
Check if the battery is charged, inspect connections between the battery and main board, and test the power switch and Hall sensor for functionality.
What should be done if the microphone is not working?
Inspect the mic for rust or corrosion, check the wiring to the main board, and measure voltage levels between the power IC and the mic.
How can you test the NTC sensor?
Measure the resistance across the NTC sensor; resistance should decrease as temperature rises.
What might indicate a connectivity problem with Bluetooth?
Issues connecting via Bluetooth could be due to rust on the antenna wire or faulty components like the Bluetooth IC.
What is the correct voltage range for the battery?
The battery voltage should be between 3.8V and 4.4V.
How can you identify a damaged Hall Effect sensor?
Measure its output with a multimeter; if the values do not fluctuate when a magnetic field is introduced, it may be faulty.
What are the wire colours for the battery connections?
The battery positive (B+) uses a red wire, and the negative (B-) uses a brown wire.
How do you inspect the charging port?
Check for physical damage and ensure that the connections are secure and intact.
What is the function of the NTC sensor in the neckband?
The NTC sensor monitors the battery temperature to prevent overheating.
What should you do if you find missing components near the connection points?
Replace them with similar components or use jumper wires to connect the appropriate pads.
How can you ensure that the power switch is functional?
Use a multimeter to check for continuity and voltage readings; it should read around 2.8V or higher.
What is a common cause of charging problems?
Damaged wire connections or a faulty charging connector can prevent proper charging.
What should you do if the battery voltage is outside the specified range?
Replace the battery if the voltage is outside 3.8V to 4.4V or if it is determined to be faulty.
fromFrom what steps are involved in testing the Bluetooth IC?
Inspect for continuity, test surrounding components, and replace the Bluetooth IC if issues persist.
What can happen if the Hall Effect sensor is damaged?
A damaged Hall sensor can lead to erratic on/off behaviour or issues with pairing.
How should you handle a faulty component found during inspection?
Replace any faulty components to restore proper function to the neckband.
What is the NTC (Negative Temperature Coefficient)?
The NTC is a temperature sensor that decreases resistance as the temperature rises. It monitors the battery’s temperature and helps protect it by altering the charging behaviour if it gets too hot.
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