vom multimeter

flexible cable below is the bald-head power-regulating potentiometer. Amplification diagram of Laser head assembly Turn the optical drive over and let the laser head down, and then we'll see the shape of the back of the bald component. The position near the flexible cable below is the bald-head power-regulating potentiometer. 9. For potentiometers to pay attention to the potentiometer has three pins, if the use of multimeter test, of which two pins

Debugging is to enable the ups to run properly at startup. The specific content of various types of USP to be debugged is different, but the tests that must be performed generally include the following content. I. Preparations before debugging 1. tools used for debugging Tools used for debugging include multimeter, internal resistance tester for battery, electric tester, and phase table. (1) multimeter:

connection should be used when connecting to the standard serial port. Check whether the serial port on a development board is a standard serial port or a non-standard serial port. It depends on how the schematic diagram is connected. ^-^ Question 2: How to identify cross-string and direct-line connections? Test with A multimeter. If the General Principles of 2, 2, 3, and 3 are directly connected to the serial line; if the two and 3 connections, the

enter the idle mode is usually to reduce the power consumption of the system. For example, we have used a digital multimeter, during normal use, the single-chip microcomputer inside the table is in normal working mode. when not in use, you forget to turn off the power of the multimeter. Most tables are waiting for several minutes, if no manual operation is performed, it will automatically turn off the LCD

turn, test the flexibility of the needle out of each print needle and the consistency of the flight distance.4 Put the print head back to the original printer, do not install a ribbon, self-test printing a single sheet of paper (to prevent the new installation of the printing needle will be hung up), and then use the print head broken needle test procedures for testing, check normal after the use.2. Trouble shooting of the printing sewing ringAnother common fault with the printhead is that the

The first step, in the working time to open the router's management information base that is MIB, MIB information on the network on the average flow of less than 50%, only a small part of the data collision, which indicates that the current network structure most of the equipment is intact, the fault may be caused by a workstation. In order to accurately identify the fault point, to find a network of multimeter access network for testing, network cong

1 motherboard capacitor damage causes graphics card to work abnormally Case My computer suspected that the motherboard is broken, open the chassis, found that the AGP side of the electrolytic capacitor has been bulge, how to solve? [Case analysis Processing] The capacitor has the characteristic of AC-DC breaking and the electrolytic capacitor acts as the filter in the circuit. The capacitor drum is due to high temperature, high pressure and capacitance of its own quality, according to the no

Open the display machine does not display, with the Multimeter electric barrier test power line input, resistance to infinity, indicating that the power cord has been open. Power-on check, found that the fuse on the circuit board has been blown, replaced with a new fuse, the boot that burns insurance. There is a high pressure inside the monitor, although it does not cause life risk, but the taste of electric shock is not easy. Therefore,

, it is essential to see how the schematic is connected ^-^ Question 2: How to identify the cross-serial line and the direct-connect serial line. Measured with a multimeter, if 2 and 2, 3 and 3 are straight serial lines, if 2 and 3 pass, 3 and 2 are the cross-serial line of the general. Someone confused mother mouth outside is a piece of insulating rubber, multimeter probe can not go in how to test it

Tag: Otherwise phone div integer distinguishes multiple color else printTitle DescriptionAs we all know, xry111 in hardware is very dwarfish, repair a headset can be the channel welding reverse. Now, xry111 is going to take an n-channel audio cable to deliver the N-channel audio output from the iphone. This line has n signal lines and 1 ground, wherein the ground is in the form of a shielding layer, very good distinction. However, for the n signal line, xry111 feel very headache, dare not feel f

I bought a 7-segment LED digital tube with ten pins, but the pins are not on the upper and lower sides, they are on both sides of the left and right. Best reference answer:Use a digital multimeter for pin-by-pin testing. Generally, the 10 pins are 7 segments and two public segments plus one decimal point.The public end is generally in the middle or at the most side, two rows, one row and one symmetric. You can sort other pins by yourself.Assume t

lead, which is generally not broken. 2. Determine whether the plug is damaged. If the plug is inserted on any P3, shake the lead close to the plug position, as long as the two ears are ringing, the listening head must be OK, the damaged part must be the plug. If only one ear rings. Further detection is required. 3. Determine whether the listening header is damaged. The general good ear plug listening head is not bonded with a kubernetes, but with a soft adhesive. It is doomed that it will

USB hub. Therefore, when purchasing a USB hub instance, you must first check the output current of the adapter,The adapter with an output current of 1.5a can meet the needs of two mobile hard disks simultaneouslyIf you have more USB devicesThe current of all devices is added (the standard device has a nominal current value on the nameplate) and multiplied by 1.2.To ensure a certain margin of power supply, and then select the hub adapter based on the total data. Step 2: view the voltage If

electric chromium is welded. This fault is common in ST laser printers, but sometimes the power supply control is partially unidirectional thyristor failure. Dingying lamp, thermistor, and thermal protector are also common faults. If the measuring tube is burned out, the thermal resistance is poor, and the open circuit of the thermal protector must be replaced.Fault 3: the heating lamp of a canon bx ii laser printer is always on, sometimes not on.Repair Method: when the heating lamp is not on,

What to do if the laptop motherboard is out of power: First step. First, pin 14 and 15 short, and if the fan on the ATX power supply rotates, skip this step and look at the next one. If the fan on the ATX power supply does not rotate, use a multimeter to cross the +5svb end of the Pin9 to measure the Pin15 voltage, and if there is a +5v voltage, then there is a doorway, please see the next one. If there is no voltage, generally please discard this

detected the hard disk, and the normal access to the system, but the system soon ran suddenly panic, and prompted the hard drive read errors. 2, restart the computer, run HDD scan software into the main interface, and then click the "Start" button-year-old hard drive for scanning. 3, scan the completion of the scan results will be a legend in the form of the right side of the interface, the figure shows that the hard drive does not exist any bad. 4, restart the computer failure is still, at

results will be a legend in the form of the right side of the interface, the figure shows that the hard drive does not exist any bad. 4, restart the computer failure is still, at this time suspected power supply D line plug voltage is insufficient, and then use the Multimeter Test D line power supply voltage. 5. First measure the voltage between the yellow and black lines corresponding to the pins, the multimet