Bluetooth Earphone/Headset/Headphone Inspection Checklist

Posted By: AQI Serviceon: December 27, 2017In: AQI Service Blog, Inspection Cases

Bluetooth Products Manufactured in China

Now Bluetooth earphone, headset or headphones sold all over the world are all virtually manufactured in China, these different type of Bluetooth earphones or headsets, are outsourced from the various manufacturing companies located in China. The quality of these products is ensured by conducting quality control protocols during Pre-production inspection, Inline production Inspection, and Pre-shipment Inspection.

Below are some of the most common factors which are used in the creation of AQI quality control standards and SIP(Standard Inspection Procedures), for more questions please contact AQI Service.

Headset/Earphone appearance inspection checklist and defects classification

Defects #	Defect Description	Critical	Major	Minor
#1.	Poor sound		√
#2.	Sharp point / sharp edge on accessible parts.	√
#3.	internal Rust mark	√	√
#4.	Loose plug		√
#5.	Gate remnant			√
#6.	Conversely left and right channels		√
#7.	Rough surface/Poor surface			√
#8.	No sound		√
#9.	Button cannot control		√
#10.	Broken		√
#11.	Microphone no sound		√
#12.	Deformed		√	√
#13.	Buckle broken		√
#14.	Wire exposed		√
#15.	Dirty		√	√
#16.	Scratch（ above: width =0.5, length= 2mm)		√	√
#17.	Poor printing			√
#18.	Poor assembly			√

Headset Function Inspection checklist:

Inspection plan	Requirement	Criteria	Sample size	Remarks
Function check	As instruction manual and must conform to indicated function， the sound must be good from low to high. The sound is good at pause, at the beginning, fast, with telephone.	No malfunction	Full
Microphone check	Check the quality of the micro, sound is clear, no noise	No malfunction	Full
Visual check	Check the appearance, pay attention the the bottom	Without defect	Full
Construct check	Pull and press with normal force, there is no structure loosen, no buckle broken, no poor assembly	Without defect	Full
Button check	Adjust the button, rotate the plug, play well, no stop, no noise	Without defect	Full
Blue tooth check	. Check the transmit distance, check the quality of the sound, there is no noise at the beginning and during playing. The pairing name must right.	Without defect	Full
Volume check	The max, min volume must be good	Without defect	Full
Channel check	Check the left and right channel, must be right.	Without defect	Full
Fatigue test	20 times for each button, plug and switch.	No damage or block.	S-2
Rub check	Use cotton dripped with water, rub the marking on rating label and silk-screen printing or electro-plating by hand for 15 seconds.	Marking is clear after the rub, no peel off or lite upward on rating label.	2 /item
Tape check	Use the 3M (600) gummed tape to paste total cover the printing or electro-plating, peel the tape at 90°±30° rapidly;	Marking is clear after the test, no peel off on plating.	2 /item
Running Test	Max setting, for 4 hours running.	No malfunction and safety issue	3 /item
Carton drop test	One corner, three edges, six sides, at height of 30inch (﹤9.5kg) 24inch (9.5kg～18.6kg) 18inch (18.6kg～27.7kg) 12inch (27.7kg～45.3kg) 8inch (45.3kg～68kg) on the cement floor	No unit drop out, no any damage on unit.	1
Internal test	Open unit, visual, check the workmanship.	No damage on component.	3
Smell check	Should no spark during switch on/off, running, spring operation or any other operation	No failure.	Full
Impedance check for speaker	Use a test system and a graph to check if the impendence is as the spec	No failure.	3 /item
Frequency response check	Input a sweep frequency signal as per the Frequency range (eg. 18Hz~22kHz) to check if the voice was distortion or not.	No failure.	3 /item
RMS power check	Use sound analyze system to measure	No failure.	3 /item
Sound pressure test	Use sound analyze system to measure	No failure.	3 /item
Sound level test	Use sound analyze system to measure	No failure.	3 /item
Bluetooth connect check	Check if the earphone could be failure in connecting with smartphone in 10 meters.	No failure.	3 /item
Water proof test	Depth 1 meter for 30 minutes	No failure.	3 /item