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Common Faults And Maintenance Methods of The Access Control System

May 26 , 2023

Common Faults and maintenance methods of the access control system

The entrance and exit access control safety management system is a new modern safety management system, which integrates microcomputer automatic identification technology and modern safety management measures. It involves many new technologies such as electronics, machinery, optics, computer technology, communication technology, and biotechnology. It is an effective measure to solve the security management of the entrance and exit of important departments. Applicable to various confidential departments, such as banks, hotels, parking lot management, computer rooms, armories, confidential rooms, offices, intelligent communities, factories, etc.


In the use of the access control system, there will be some faults more or less. Today, the editor will take everyone to understand the common faults and maintenance methods of the access control system.


Fault 1: The valid card cannot open the door

Maintenance method:
1Check whether the electric lock is normal. Check the power supply or replace the electric control lock.

2. Whether the lock tongue and the lock buckle are mechanically stuck, repair the mechanical failure or replace the parts.

3. Check the indicator light on the control board, check whether the communication between the control board and the module is normal, and troubleshoot.

4. Check whether the communication between the card reader and the module is normal and troubleshoot.

5. Whether the information day closing order is set. Adjust the opening time through software.

6. Whether the operator initializes the access control system or re-authorizes other commands through the software.

Access Controller

Fault 2: access control communication failure

Maintenance method:


1. Check whether the serial port is set incorrectly (determine the serial port used).

2. Check whether there is a short circuit or open circuit on the access control communication bus (exclude the short circuit and open circuit of the communication line).

3. Check that the communication chip 75184 of the RS485 communication card is damaged (replace the communication chip 75148).

4. The RS485 communication card is damaged (replace the RS485 communication card).

5. Check whether the crystal head of the network cable is well done, check whether the network cable is connected, and ping the address of the access control controller.


Fault 3: Access control records cannot be extracted

Maintenance method:

Empty access controller, reload time


Fault 4: The door lock keeps opening

Maintenance method:


1. The operator sets the status of the access control device to normally open, or other reasons cause the controller to be in the normally open state.

2. The controller is faulty.


Fault Five: The IC card cannot be read

Maintenance method:


1. The IC card has been set for the valid time period of card reading when the IC card is authorized (it can be set for valid card reading all day).

2. The access controller is abnormally hot (replace the access control board).

3. Access control read-write antenna (adjust the fine-tuning capacitor to enhance the card reading distance).


Fault 6: The communication between the computer and the controller is unstable

Maintenance method:


1. The signal line that does not meet the requirements or a low-quality signal line is used, and the high-quality signal line needs to be replaced.

2. The laying of the signal line is not standardized. If the signal line and the power line are in the same tube, the signal line needs to be laid again.


Author: Written by Anna Zhang from S4A INDUSTRIAL CO., LIMITED



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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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    Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.

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