Abstract

Disinfection cabinet control board is the core component to realize timing, temperature control, disinfection mode switching, safety interlock and intelligent operation. Its reliability and stability directly determine the service life, safety performance and qualification rate of disinfection cabinets. This paper focuses on the key points of production testing, quality control system, common fault analysis and improvement measures of disinfection cabinet control board, so as to provide reference for manufacturers to improve product consistency and reduce after-sales failure rate.

Keywords: disinfection cabinet; control board; production testing; quality control; reliability test

1. Introduction

With the improvement of health and safety requirements, disinfection cabinets are widely used in household, commercial and medical scenarios. As the “brain” of the whole machine, the control board undertakes functions such as key input, display output, temperature acquisition, relay control, fan / heating tube / ozone / UV drive, door interlock protection and fault alarm. In the mass production process, incomplete testing and lax quality control will lead to abnormal startup, temperature out of control, mode failure, electric shock risk and other hidden dangers. Therefore, standardized production testing and perfect quality control system are particularly important.

2. Core Functions of Disinfection Cabinet Control Board

Before production testing, it is necessary to clarify the main control functions to ensure full coverage of testing items:

Power management and anti-surge protection

Key / touch control and mode selection (high temperature, UV, ozone, drying, storage)

Real-time temperature detection and over-temperature protection

Timing control and automatic shutdown

Display (LED / digital tube / LCD) and indicator output

Relay / thyristor drive for heating and load control

Door switch interlock and child lock function

Fault self-diagnosis and alarm (over-temperature, sensor abnormality, load short circuit)

3. Production Testing Process of Control Board

A complete production testing system generally includes the following stages:

3.1 Incoming Inspection of Components

Check PCB appearance, thickness, solderability and line continuity.

Verify the model, batch, parameters and appearance of MCU, capacitor, resistor, diode, relay, sensor, connector, etc.

Conduct sampling test for key components such as temperature sensor and relay to prevent early failure.

3.2 Online Testing after Soldering

Use flying probe tester or special test fixture to detect short circuit, open circuit, virtual soldering, wrong parts, leakage and reverse polarity.

Test key node voltage, current and quiescent power consumption to eliminate hidden dangers of assembly.

3.3 Power-on Function Test

Simulate actual working conditions through special test bench:

Power-on startup and reset test

Key response and display test

Temperature signal acquisition and AD sampling accuracy test

Load output (relay pull-in, fan, heating tube drive) test

Door interlock, child lock, timing function verification

Over-temperature protection and fault alarm simulation

Record test data and judge PASS / FAIL automatically.

3.4 Aging Test

Carry out 4–24 hours of power-on aging under normal temperature / high temperature environment.

Simulate repeated startup / shutdown, mode switching and long-time operation.

Screen out early failure products caused by poor soldering, component fatigue and compatibility problems.

3.5 Safety and Reliability Test

Withstand voltage test, insulation resistance test and grounding test.

Anti-static, anti-surge and anti-interference (EMC preliminary test) test.

High and low temperature cycle, vibration and drop test for sampling.

3.6 Final Inspection and Packaging

Recheck appearance, mark, function and test record.

Paste qualified label, traceable code and carry out anti-static packaging.

4. Key Points of Quality Control System

4.1 Process Control

Standardize SMT / plug-in / soldering process parameters to avoid cold solder and continuous welding.

Implement strict station handover and first-piece inspection system.

Establish traceability system: PCB batch, component batch, production date, test data, operator number.

4.2 Test Equipment Calibration

Regular calibration of test fixture, multimeter, oscilloscope, temperature tester, pressure tester.

Verify the validity of test program to prevent missed detection and false detection.

4.3 Defect Classification and Management

Classify defects: critical safety defect, main function defect, minor appearance defect.

Real-time statistics of failure rate, analyze the root cause and implement corrective actions.

5. Common Faults and Improvement Measures

No power displayReason: power supply circuit damage, fuse blown, virtual welding.Improvement: strengthen incoming inspection and voltage test.

Temperature control out of controlReason: sensor drift, AD error, relay adhesion.Improvement: dual temperature detection, mandatory over-temperature protection.

Button failure / insensitiveReason: touch panel damage, connector loose.Improvement: enhance waterproof and dustproof design and key life test.

Load not actingReason: drive circuit damage, relay failure.Improvement: 100% load output test before aging.

6. Conclusion

Production testing and quality control run through the whole life cycle of disinfection cabinet control board. Through standardized incoming inspection, online test, function verification, aging screening and safety test, combined with complete process control and traceability system, the stability and safety of the control board can be effectively guaranteed, the after-sales failure rate can be reduced, and the product competitiveness of disinfection cabinet enterprises can be improved.