5 , Comparative Law

 

Running the same or similar computer two or more units , according to the normal PC and computer failures in the implementation of the different manifestations of the same operation can determine the initial site failures.

 

6 , vibrating percussion method

 

Gently tapping with your fingers chassis shell, it is possible to solve the problems caused by failures caused by bad or Weld . Check the location of the fault can then be further point to exclude .

 

7 , heating and cooling method

 

Artificially elevated temperature microcomputer operating environment , you can test the computer components ( especially cpu) high temperature conditions , and thus early detection of potential accidents .

 

Artificially lowering the temperature of the operating environment of the computer , if the computer is greatly reduced failure rate , indicating that the fault lies not in the high-temperature or high-temperature components , the move could help narrow the scope of fault diagnosis .

 

In fact, the temperature of the cooling method is to use the principle of fault trigger to manufacturing fault conditions to promote the frequent occurrence of the failure to observe and determine the fault is located.

 

8 , program testing method

 

With the wide application of the integrated circuit , the welding process more complex, while technical information over the lack of random hardware , hardware maintenance alone means it is often difficult to identify the fault lies. The random diagnostic procedures, diagnostic card and dedicated service based on various technical parameters ( such as the interface address ) , self- diagnostic program dedicated to assist hardware maintenance can achieve a multiplier effect . Principles of program testing method is to use software to send data , commands, and by reading the line status of a chip ( such as the register ) to identify the fault status of the site . This method is often used to examine a variety of interface circuit failure and various circuit parameters with the address . But the premise of this method is the application of basic cpu and bus operating normally , be able to run the diagnostic software that can run diagnostics card installed in the i / o bus slots and so on . Preparation of diagnostic procedures to be strict, comprehensive , targeted , allowing some of the key parts of a regular signal , capable of occasional failure of repeated testing and can display recording error conditions . Software diagnostic method requires programming skills with proficiency , familiar with various diagnostic procedures and diagnostic tools ( such as debug, dm , etc. ) , to master various address parameters ( such as various i / o address ) and circuit principles , etc., especially to master a variety of interfaces various diagnostic unit normal reference values ​​based on the premise that the effective use of software diagnostic method .

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