沧州市金泰衡器有限公司-智能电子汽车衡,电子台秤,电子吊称

1 , percussionist pressure method

 

Operation of the instruments often encounter the phenomenon of good times and bad , this phenomenon is due to the vast majority of poor contact caused or Weld . This situation can be used for hand percussion and pressure method . The so-called " percussion " is the likely cause of the failure on the part of , or through a small rubber hammer percussion beat lightly with plug-in boards or components , to see whether it will cause an error or downtime . The so-called " hand pressure " is in the failure occurs, turn the power off on the plug and plug and seat parts re- fastened by hand , and then boot if it would eliminate the fault . If you find that beat about the normal case , then do not beat normally, the best first re-insert all connectors firmly and try again, if the headache is not successful , had to think of other ways .

 

2 , observation

 

The use of sight, smell, touch. Sometimes, damaged components will change , blistering or burning spots appeared ; burned device will produce some special smell ; short circuit chips will be hot ; can also be observed with the naked eye or sealing off at Weld .

 

3 , exclusion

 

The so-called exclusion through a number of plug -in plug-in board , the device to determine the cause of the malfunction approach. When a plug-in board or disconnect the device after the meter returns to normal , it shows where the failure occurred .

 

4 , substitution

 

Requires two types of equipment , or have enough spare parts. Will be a good spare and fault plane of the same components to be replaced, to see whether the fault is eliminated.

 

5 , compared to France

 

Requires two instruments of the same type and have a normal operation . Using this method also has the necessary equipment , such as multimeters , oscilloscopes , etc. According to the nature of comparison with the voltage comparator , waveform comparison , the static impedance of the output is compared with the current comparison . The specific method is : Let the faulty instrument and the normal operation of the instrument in the same circumstances , and then at some point detection signal and then compare the two sets of the measured signal , if they are different , then we can conclude that the fault lies here . This method requires that maintenance personnel have considerable knowledge and skills. Multimeters and other instruments Ten troubleshooting techniques

 

6 , heating and cooling method

 

Sometimes , the instrument to work longer hours , or high ambient temperature in the summer when there will be failures , shutdown examination was normal , stop for some time and then boot normally again after a while and failed. This phenomenon is due to the poor performance of individual IC or components , high-temperature characteristic parameters reach the indicator due. To find out the cause of the malfunction , heating and cooling method can be used . The so-called cooling , is in trouble occurs, the use of anhydrous alcohol in the cotton fiber will likely wipe out the fault location , making it cool to observe whether the fault is eliminated. The so-called temperature is artificially elevated ambient temperature , such as electric iron placed near the site of a doubt ( note the temperature must not rise so high that damage normal device ) Look at whether the fault occurs .

 

7 , riding shoulder method

 

Riding shoulder method, also known as parallel method . An IC chip to a good chip to be checked over , or the good components ( resistors and capacitors, diodes, transistors , etc. ) and to check the components in parallel , to maintain good contact , if the fault comes from the open or inside the device poor contact and other reasons , the use of this method can be ruled out.

 

8 , capacitive bypass method

 

When a circuit generates a rather strange phenomenon , such as monitors confusion , you can bypass capacitor is determined by the fault is probably part of the circuit . The capacitor is connected across the IC's power and ground terminal ; pair transistor circuit connected across the base -collector input or output , observation of the failure phenomenon. If invalid input bypass capacitor bypass its output when the fault disappears , it is determined that failure to appear at this level circuits.

 

9 , the state Adjustment Act

 

In general, the failure determined before, do not touch circuit components, especially adjustable device is especially true , for example, potentiometers, etc. . However, if multiple reference measures taken in advance ( for example, untouched position before mark or measure voltage or resistance values ​​, etc. ) , if necessary, or allowed to touch the . Maybe sometimes fail after a change would eliminate .

 

10 , the isolation method

 

Fault isolation method does not require the same type of equipment or spare parts for comparison , but also safe and reliable. According to the fault detection flowchart segmentation fault surrounded gradually narrow the search, and then compared with the signal , component exchange method, the general will soon be found fault lies.