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23/7/2008
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Choose the attentive matters of second hand computer fittings
Choose the attentive matters of second hand computer fittings
Fifth, the second hand fittings are chosen and checked A display It it chooses to be second hand display had better look by brand and date of production (the the back mark have on the date of production
usually at display, Fig. 1) ,Can test too, it can discern the true " age " (Fig. 2) of the display with PowerStrip . Should notice most large resolution ratio, focusing on, luminance, stability of display,etc. mainly check specifically, the basic tool is as follows: Observe the characters of the edge of display under the largest resolution ratio that the display supports, focus on the good display characters sharply, the character is clear; Transfer until thorough examination appear, flyback line or pale ruler that slope the most luminance, this kind of situation appears to belong to the picture tube wears out or or the high-pressure circuit performance of display is bad; During the process of adjusting the luminance, there should not be obvious flexible phenomenon and the phenomenon glimmers in the screen.
2 hard disks
The hard disk is the fittings aptest to be damaged, the quality that should pay attention to it even more while choosing the second hand hard disk. Should listen to carefully hard disk start with operation there is different of the coursing at first check hard disk, should notice while carrying on quality examination, unable to check to the bad track of hard disk with formatting tools in Chost and Windows, China Electronics Manufacturers| Smt Electronic Manufacturing| Electronics Contract Manufacturing| Electronic Contract Manufacturing Services| Subcontract Pcb Assembly by " it is unable to check some questions sometimes to order the formatted hard disking, had better utilize " Scandisk " to measure the whole quotation (take a long time)
Whether is there a bad way; In addition it notice hard disk temperature operate, too high than long time (some hard disks will go wrong behind
operating certain time) .
3 CPU
CPU determines the most important fittings of the complete machine performance, is considered in term of improving the cost performance of complete machine, after confirming choose the main board, propose the highest mainly CPU frequently that tries hard to choose this main board to stand. Value that there is second hand CPU at present should be Pentium, Celeron, K6 2, Pentium MMX, K6, M, Pentium sequentially, propose choosing mainly in CPII of above 166MHz frequently.
Date of production of the display
Second hand CPU will scarcely present the quality problem, so long as can install the operating system normally, can operate the multimedia procedure and can think quality reaches a standard in the operating system, notice some trade companies may exceed CPU to sell frequently.
Second hand and P little at market at present, and price relatively expensive, if you want to buy friend of P notice, a batch of P 733 of Slotl tructure has appeared on the market at present, this CPU uses the processor Celeron 500 of the notebook computer in fact (128KB L2 Cache, Socket370 structure) Transform with Celeron switching card, this kind of CPU can exceed operating on some VIA 693 and main board of chip group BX frequently outside 133MHz frequently and reveal P 733.
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