General large-scale constant temperature and humidity (step-type constant temperature and humidity) control part is installed in the right side of the device, distributed temperature controller, control switch, etc., the electrical control system and refrigeration system of the equipment is installed in a separate electrical control cabinet Inside, the electric control cabinet and the laboratory are connected by a special device into a whole, and the independent design facilitates maintenance and maintenance. 
For the control system manufacturers, it is recommended that users regularly check and repair to ensure the long-term normal operation of the equipment. Some manufacturers take a manual to the user, but for operators who do not understand the structure of the equipment is simply a headache. Today, Beijing Pusanda has come to tell you some practical maintenance techniques. These skills are ours. Engineers' summary of actual operations is more targeted.
Secret: The most practical maintenance method for failure of walk-in constant temperature and humidity control system
First, the instrument comparison method
The specific method is: let the faulty meter and the normal meter operate under the same conditions, and then detect the signals of some points and then compare the measured two signals. If they are different, you can conclude that the fault is out here. This method requires maintenance personnel with considerable knowledge and skills.
Two instruments of the same type are required and one is in normal operation. Use this method also has the necessary equipment, for example, multimeter, oscilloscope and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output comparison, and current comparison.
Second, the capacitor bypass method
When a circuit produces a strange phenomenon, such as a disorganized display, the capacitor bypass method can be used to determine the portion of the circuit that has failed.
Third, the isolation method
Fault isolation method does not require the same type of equipment or spare parts for comparison, and it is safe and reliable. According to the fault detection flow chart, segmentation and enveloping gradually narrow down the fault search range, together with signal comparison, component exchange and other methods, the fault will generally be quickly found.
Fourth, hit the law
The phenomenon of good or bad operation of the instrument is often encountered. The vast majority of this phenomenon is due to poor contact or welding. For this situation, tapping and hand pressure can be used.
The so-called "knocking" is to gently hit the board or part with a small rubber hoe or other knocker to see if it can cause an error or stop failure. The so-called "hand pressure" is when the fault occurs, after the power is turned off, the plugged parts and the plug and the base are again pressed firmly by hand, and if the power supply is turned on, it will eliminate the fault. If it is found that knocking the case is normal, then when the beat is not normal, it is better to re-insert all the joints and try again. If it is not successful, you have to find another solution.
Fifth, the state adjustment method
In general, before the failure is determined, do not touch components in the circuit, especially adjustable devices, such as potentiometers. However, if the paperless recorder first takes multiple reference measures (for example, position marks or voltage values ​​or resistance values ​​are measured before being touched), it is allowed to act if necessary. Maybe after some change, the fault will be eliminated.
The power and ground of the IC ; the transistor circuit is connected across the base input or the collector output to observe the effect on the fault phenomenon. If the color paperless recorder bypasses its output when the bypass input of the capacitor is inactive and the fault disappears, a fault is identified in this stage of the circuit.
VI. Observation
Uses sight, smell, touch. In some cases, the damaged components will discolor, blistering, or burn spots; burned devices will produce some special odors; short-circuited chips will become hot; visible or unwelded areas can also be observed with the naked eye. .
Seventh, riding a law
The riding method is also called parallel method. Place a good IC chip on the chip to be inspected, or connect good components (resistance capacitors, diodes, transistors, etc.) in parallel with the components to be inspected to maintain good contact if the fault is caused by an open circuit inside the device or For poor contact and other reasons, this method can be ruled out.
Eight, replacement method
1 ) Element replacement method: Two instruments of the same type or sufficient spare parts are required. Replace a good spare with the same component on the faulty machine and see if the fault is eliminated.
2 ) Function replacement method: When the function of a part of the faulty machine is lost, because the original spare part can not be found for a time, according to the circuit principle of the part, the procurement or self-made electrical parameter function is the same or near part replacement, and can also be achieved. The purpose of repairing the instrument.
Nine, lift temperature method
Sometimes, the instrument work for a long time, or in the summer when the working environment temperature is high, it will malfunction, shut down and check normally, stop for a period of time and then boot again and normal, after a while there is a failure. This phenomenon is due to the poor performance of individual ICs or components, and the high temperature characteristic parameters do not meet the requirements of the specifications. In order to find out the reason why the metal processing network, you can use the heating and cooling method.
The so-called cooling, that is, in the event of a failure, the use of cotton fiber will be wiped in place of possible failure of the alcohol to make it cool, observe whether the failure is eliminated. The so-called warming is artificially raising the temperature of the environment, such as using a soldering iron near the point of doubt (note that the temperature must not rise too high to damage the normal device) to see if the failure occurred.
Ten, elimination method
The so-called exclusion method is to determine the cause of the fault by inserting and removing some plug-in boards and devices. When a certain plug-in board or device is removed and the meter returns to normal, it indicates that the failure occurred. This method is also a method that the technician should master and skillfully use.
These methods can only be applied to the control instrument can not be turned in operation, for other equipment failures: For example, the compressor can not function properly, the heating tube aging and other factors, can only find the factory to repair.
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