vom multimeter

software failures, notes or reinstall operating system, the problem remains. Considering the CMOS settings will also lead to the situation of the crash, so restore the initial CMOS setup, open the chassis to remove other cards to minimize boot, replace memory, check the CPU failure is still, with a multimeter to measure the internal power supply plug voltage is normal, because this machine for the ATX power supply to the motherboard plug can not unpl

... If you are still working hard to develop a rapid development tool, single multimeter generator, you hope to eventually write code to the programmer... If you have used an expensive development platform from a well-known manufacturer, it will not work well... If you do not know what architecture design is... If you are bored with small website development... If you have found that "if" there is a problem above, but you do not know what to do..

complete it! 2. The core board and the minimum system version do not match each other in some places. Just take a look at the pin! 3. Pay attention to pin configuration in startup mode! 4. The result is that the program can go in, but it cannot run. Continue to check! 5. Take out A multimeter and directly check the gpio pin voltage. First of all, make sure that your program is normal. It must be a hardware problem. Finally, I found that the root

from the hard drive. At this time, you can see two lines of spring clips on the hard drive. One row serves as the power supply of the main motor, the other is the power supply of the drive coil of the head manipulator as the hard drive body, and the data transmission interface between the hard drive body and the circuit control panel. For Hard Disks without special encapsulation, it is often possible to see the dust on the spring and the corresponding part of the control circuit board. Clean wi

burning or preparation for reading when the disc is just started, dual hard disk copy data will be able to cause power protection due to the instantaneous power supply, and the output will be stopped because when the power supply stops and the output load is reduced, the power supply will be restarted again because the protection recovery time is short. host restarts automaticallyIn other cases, the performance of the host switch power supply is poor. Although the voltage is stable, the harmoni

hard disk copies data, the output may be stopped due to insufficient Instantaneous Power Supply and power protection. However, when the power supply stops, the load is reduced, and the power supply starts again. Because the recovery time after the protection is very short, the performance is that the host restarts automatically. Another case is that the performance of the host's switching power supply is poor. Although the voltage is stable, it is within the permitted range, but the harmonic

I have watched a movie about money-carrying vehicles. Although it is illegal, it is also a work of others. However, this job is too complex. It is not only a hacker (who intrude into the traffic system to control traffic lights), but also an architect, mechanic, electric welder, and a variety of gun-supporting bullet medicines, you must be familiar with the planning of urban roads, subways, and sewers. At the same time, you must use mathematical knowledge to calculate the location and time. This

, the type D plug of the power supply is loose or the poor plug of the computer working environment is oxidized and rusted, the power supply of the optical drive is not very normal (if it is a hard disk, the sound of the reading disk will be abnormal, and there are a lot of bad sectors on the hard disk surface), the optical drive will not find. Once, we upgraded the client's IBM host and installed an optical drive. I don't know how to find a new 40-fold Optical Drive. The drive-out box is norm

indicator light), and so on, because the use of light-emitting diodes, so the plug-back cannot shine, be sure to carefully check the definition of the positive and negative sides of the plug-in. Reference: http://www.cedu.cn/bbs/dispbbs.asp? Boardid = 34 id = 24361) 3. Peripherals, such as printers, digital cameras, tablet, and scanners. Troubleshooting of printer faults, installation of printer drivers, replacement of matrix printer ribbons, and common printer settings. Continuous paper, set

-charging )! After the charger is plugged in, you only need to ground the batdet foot of PMIC to ensure that there is a current flowing in. The battery voltage only affects the charging status (such as pre-charging or constant current charging ), if the battery voltage is low, it takes a little longer to pre-charge the battery. You can complete the pre-charge within one or two hours to enter the constant current charging status! Generally, batteries are self-protected. A qualified battery should

introduction 1665.3.3 hardware connection process 1675.3.4 LCD library 1715.3.5 software 1735.4 summary 174 chapter sound project 6th project 1-network radio station 1756.1.1 USB sound card 1756.1.2 software 1776.2 project 2-music player 1796.2.1 component list 1806.2.2 circuit connection 1806.2.3 software 1836.3 project 3-volume indicator 1856.3.1 component list 1856.3.2 circuit connection 1866.3.3 software 1896.4 summary Chapter 191 tools and tip 1927.1 differences in data manual 1927.1.1 Dat

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I have always wanted to become a qualified Hardware Engineer. However, the current hardware engineers are no longer able to use a multimeter as before. With the development of embedded and integrated circuit ASIC, the industry's requirements for hardware engineers are getting higher and higher. As more and more new technologies make hardware engineers suffer, 35 is basically hard to find a job, and the wages are still low. It was already brilliant w

has good switching characteristics and short reverse recovery time. It is usually used as a rectification diode in a switching power supply. 6. LEDs: Light Emitting Diode (LEDs) is a device that uses semiconductor materials, such as phosphating and phosphorus, to directly convert electric energy into light energy, it also features unidirectional conduction of common diodes. 7. photosensitive diode: Converts light energy into electrical energy for optical control facilities. Vi. measur

the memory. Therefore, after separately testing the CPU, motherboard, and memory, we found that there was a problem with the motherboard. Even if other power sources, CPUs, and memory were used, there was still a crash and hard disks could not be found. It can be basically determined that there is a problem with the IDE interface of the motherboard and the hard disk cannot be identified. 4. We thought that the fault had ended. We replaced the new motherboard of the same model and installed it.

As a cost-effective network device, terminal servers have a broad market in China. It can connect many asynchronous devices and only occupy one network node, thus reducing the collision rate on the Ethernet and improving the communication performance of the network. The terminal server can also be used as a printing server or an asynchronous router. When a problem occurs on the terminal server, it will have a great impact on many users. Next I will introduce two problems and solutions for the JE

fiber cables are available, which can be either the products of the company or ATT.Metal Cable trough, optional domestic materials. D. device ZoneCabinet. Optional.A 24-or 48-port distribution frame, which can be an Amat or ATT product.Jumper cables, UTP and RJ45 headers, can be AMAP or ATT products.China site.Vswitch, which can be Intel, Cisco, or 3COM.Server. Optional products include Intel, HP, And Compaq. E. Various fixed parts F. essential tools for network cablingRJ45 crimping pliers)Cabl

distribution frame end, the label should be pasted on the outer skin of the cable with a oil pen every one meter. The 4 pairs of twisted pair cables are connected to the standby cable at a rate of 3%. The standby cable is placed in the trunk cable slot, with at least one backup cable per layer. After cabling is completed, all 4-Core Cables should be fully disconnected. Test method: strip all the core Cables of both ends to expose the copper core. At one end, the digital

"DMA (if available)", and then "current transmission Mode". If "Ultra DMA Mode * (* is a number, DMA33 is 2, DMA66 is 4, DMA100 is 5, dmaloud is 6) ", then your system is normal, however, if you set "Ultra DMA Mode 6, but now it is "Ultra DMA Mode 4", "Ultra DMA Mode 2", or "PIO Mode" and cannot be changed! The system may shut down the DMA mode. 2. Check whether the CPU and fan are operating properly and cooling enough When the CPU fan speed slows down, the CPU temperature increases. To protect

internet. After several days of continuous operation, no fault has occurred, in order to confirm whether the fault is caused by static electricity, I took the wire and ran the Internet. As a result, the above fault occurred again. I used a multimeter to measure the "Zero Ground" voltage of the power outlet over 40 V, the static power of the chassis is 25 V, which proves that the judgment is correct. After the ground wire is installed, the static elec