How to answer the doorbell in the corridor? Frequently asked questions and troubleshooting

The doorbell around the general manufacturer is just an ordinary electronic traditional doorbell. Ring the doorbell can inform the owner to open the door, but there is no intercom and eye contact function, which can not guarantee the safety of the manufacturer to some extent. However, the corridor intercom doorbell introduced to you today can make up for this defect to some extent. It can not only inform the owner by ringing the doorbell, but also support the intercom between them. Moreover, the common corridor intercom doorbell of manufacturers is installed outside the unit door, which avoids the trouble and loss caused by some lawless elements trying to break into houses. Interested friends can talk to Bian Xiao about this knowledge.

1. How to wire the intercom doorbell in the corridor?

Buy a set of ups, network cable, intercom control template and independent intercom. During installation, connect a set of 220v mains electricity to the main control template, install a UPS standby power supply, and send the network cables to each household one by one. The attached manual describes the wiring method during installation. Building intercom generally has a remote control, which is connected with the security system of the property. You need to coordinate with the security department here, and you can install the intercom system when the network cable in the building is in place.

Building intercom doorbell system uses many discrete components and complicated circuits, but if there is a schematic diagram, the maintenance operation will be easy. As can be seen from the circuit diagram, the low voltage generated by the transformer is introduced from the socket V 1 2 through bridge rectification, capacitor filtering and+12V generated by the three-terminal voltage stabilizing block 78 12, and directly supplied to the relay K, and the other route is isolated by VD3, which generates VCC for other circuits. When someone presses S 1 outdoors, the signal at pin 1 of socket V6 passes through S 1, pins 2 and 3 of telephone switch SA and speaker LB, forming a current path, which is equivalent to grounding the lower end of R 17, so the base of VT5 is extremely low, VT5 is saturated, and the two pins of music ic have a trigger high level. After being amplified by IC 1(LM386), it is output by pin 5 of IC 1, and sent to speaker LB through pin 1 of V6 and pin 2 and pin 3 of telephone exchange SA to make sound. Due to the special structure of telephone exchange SA, audio signals can also be coupled to four pins of telephone exchange SA, and then coupled to seven pins of IC2(TDA2822M) through two pins of socket V3. After amplification, it is output by 1 pin, so that the doorbell ringer can hear the sound from LB 1.

Second, the corridor intercom doorbell common problems and failures

After a certain number of years of use, the keyboard board of the host computer often fails due to wear and aging. Just replace the keyboard board directly. Professional maintenance personnel are usually required to test the circuit board. If you have studied electronics, it is easy to communicate directly with the technicians of the factory by telephone. And if you can't buy relevant accessories locally, you can send them back to the manufacturer directly. The way to check whether there is a problem with the host is to replace a good host and connect it. If you can connect, you can immediately determine the problem of the host. If the replacement host does not ring, it depends on the fault type displayed by the host. Generally, you can know the problem of the line and extension according to the fault displayed on the host screen, and then check it step by step to determine where it is.

The traditional doorbell can only play the role of notification, but it does not have the effect of humanization and security. The electronic intercom doorbell introduced to you today can not only inform the owner to open the door, but also support the intercom between the two, avoiding the trouble and property safety loss caused by some lawless elements trying to break in. In addition, the corridor intercom doorbell is generally installed outside the unit door. If the host is not sure whether the visitor is friendly or not, he can completely refuse to open the door, thus avoiding the possible loss of property safety in the later period, which is precisely its humanized value.