Lekic 64xi oscilloscope repair can not be turned on fault detection free of charge
Fault symptom 1 Fault description: The scan line is displayed normally, and the signal cannot be added.
Analysis, testing and judgment: If the signal cannot be added, it is a vertical channel problem, which may cause a component in the channel to open the circuit.
Maintenance and processing: add the original positive tension signal of a signal directly to the vertical channel of the oscilloscope, check the lack of output step by step, and replace the broken tube with the oscilloscope back to normal. Until the troubleshooting is done.
Fault symptom 2 Fault description: The machine cannot be turned on.
Analysis, testing and judgment: There is an independent power module inside the oscilloscope to supply power to the motherboard and each functional module, so it is necessary to pay attention to power safety. a) Check if the oscilloscope is the original power cord, b) Confirm that the grid is stable. When there are high-power electrical appliances connected to the power grid, turn off the oscilloscope first, unplug the power cord, and wait for the power grid to stabilize before use. c) When powering on: plug in the AC power cord first, and then press the power button to power onWhen power off: Press the power off button to turn off the oscilloscope, and then unplug the AC power cable.
Maintenance and handling: pay attention to the environment in which the instrument is used, and clean up the dust regularly.
Fault symptom 3 Fault description: The oscilloscope burns the channel and burns the acquisition board.
Analysis, testing and judgment: Generally, channel faults are caused by static electricity or access to excessive signals, and in serious cases, the acquisition board and main control board will be burned. This kind of fault maintenance is difficult, the cycle is long, and the cost is high, so special attention needs to be paid in use
a) It is strictly forbidden to touch the oscilloscope channel interface with your hands or other parts of the body to prevent electrostatic damage;
b) Estimate the signal amplitude before use, and test with a probe with an appropriate attenuation factor;
c) Connect the probe before the signal is passed during the testAfter the test is completed, disconnect the test signal and then remove the probe.
Repair and treatment: replace damaged components, detect, adjust instrument indicators, maintain the whole machine, clean the ash, clean the appearance.
Symptom 4: Description: A system problem.
Analysis, Testing, and Judgment: Like a computer, an oscilloscope has its own operating system to manage and control hardware and software resources. Common oscilloscope system issues are system crash, driver loss, data loss, disk memory corruption, etc.
Maintenance and treatment: a) Regularly clean the system, carry out overall anti-virus, and back up the system;b) Do not manipulate system files. Misoperation of system files can cause a system crashc) Pay attention to the sequence of power on/off, prohibit direct unplugging of the power cord oscilloscope troubleshooting is a long process, first of all, we must deeply grasp its working principle, in order to judge the fault phenomenon for the specific location of the fault, the cause, or the scanning, trigger, power amplifier, display circuit what happened, and gradually analyze, find, detect, and replace the faulty equipment, so as to absorb effective methods and rich experience.