1. Battery Compartment Issue
Possible Causes
Battery compartment is rusted
Solutions
Replace the battery compartment
2. Battery Issue
Possible Causes
Batteries are leaking
Batteries are not charging (reserve battery)
Batteries are fully discharged
Solutions
Replace the batteries
Reinstall the batteries and ensure proper orientation
3. Installation Issues
Possible Causes
Cable joint is not inserted properly or inserted in reverse
Bent or loose pins in the cable joint pin header
Cable is crushed, broken, or distorted during installation
Solutions
Remove the cable and reinsert it correctly
Straighten bent pins and reinsert; if pins are loose, ensure they are properly seated
Replace damaged cables
4. PCB (Circuit Board) / Mortise Issue
Possible Causes
Faulty front PCB or rear PCB
Faulty mortise
Diagnosis
Test with a known working front or rear PCB to isolate the issue
Test with a known working mortise
Solutions
Replace the front or rear PCB
Replace the mortise
5. User Environment Issues
Possible Causes
Metal filings on the rear PCB causing a short circuit
Foreign material or residue in the USB port causing a short circuit
Solutions
Remove metal filings carefully
Clean the USB port using a cotton swab, or replace the USB port if required
⚠️ Important Note
NOTE: Always use a set of disposable alkaline batteries. Rechargeable batteries are not recommended.