2. If the EEPROM NG is shown on the Liquid crystal display display from the hashboard tester, Look at if the welding of U5 is typical;

seven. When powering within the hash board, the unfavorable copper wire of the ability offer has to be related initially. Just before screening the sample, the repaired hash board need to be cooled down in advance of tests, in any other case it'll induce check PNG.

② Visually inspect whether or not you'll find clear signs of burnt pieces, parts impression offset or lacking pieces, and so forth.

Two hash boards need to be placed simultaneously to form an air duct when using the chassis to dissipate warmth. For solitary-sided screening in creation, the air duct need to even be shaped.

8. When changing a brand new chip, clean the pins and utilize solder paste to make sure that the chip is coated with tin ahead of soldering.

● Once the regimen check is passed (the quick-circuit check of the overall plan take a look at is necessary to avoid the chip or other resources becoming burnt mainly because of the short circuit when the power is turned on), the chip check may be done While using the hashboard tester, and also the positioning may be determined in accordance with the take a look at result of the hashboard tester.

Examine the resources to ensure that the examination fixture can work ordinarily. Determine the parameters of the maintenance station examination software, the Model in the examination jig, and other relevant parameters.

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2. Growing older examination: Through the getting old check, repair ought to be performed in accordance with the monitored interface examination, including:

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● When locating the defective chip, the chip has to be welded all over again. The method is to add flux throughout the chip (if possible no-thoroughly clean flux), and heat the solder joints of your chip pins to some dissolved condition to prompt the chip pins and pads to re-operate in and obtain the tin, In order to attain the result of tinning yet again. If the fault continues to be the identical after re-soldering, you'll be able to right substitute the chip. ● The repaired hash board is often judged as a very good product with greater than two passes when screening Together with the hash board tester. For The very first time, soon after changing the components, anticipate the hash board to cool down, use the hash board tester to test, and after the exam is passed, set it apart after which you can neat it down. For the next time, soon after a few minutes when the hash board cools down, exam yet again. 0 About items buy, please Call our income supervisor:

The strategy for repairing the issue is as follows: through the PT2 check, intently keep an eye on the serial port print log. When the serial port has long been functioning for an extended period of time, use a short-circuit probe to short-circuit RO and 1.

① The Inquire Now main case: (typically the value in the documented chip won't change each individual take a look at), this case is probably going to generally be a result of abnormal soldering with the entrance and rear CLK, CI, BO on the X-th chip, so concentrate on these 6 resistors.

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