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In order to further confirm the problem of the chip, first, a stepping motor power supply driving tube with a comparable withstand voltage and power is replaced, and the power supply pin of the chip is recovered, and the light emitting diode circuit replaces the windings of the stepper motor as an analog load. After the power is turned on, the light emitting diodes are all on, that is, each connection is electrified. This is not in line with the line requirements. There is no response to the input stepping pulse, and therefore it is confirmed that the chip is damaged.
The chip market does not, in the case of space within the drive housing, using a combination of the existing D-trigger on the hand with a combination of non-gate design a ring pulse generator, produced in a small printed board In the above, the original chip is removed and the small printed board is mounted on the pad of the original chip through pins. There is still a light emitting diode as an analog load. After the power is turned on, a step pulse is added and the light is sequentially emitted in the phase sequence.
Remove the simulated load, access the host, power on, and the equipment is operating normally. This example shows that maintenance personnel should not only be able to analyze phenomena (overcurrent), find out more obvious causes of faults (power tube damage), but also be able to analyze the initial cause of the fault (pulse generator damage) in depth and use it. The existing meta-device combination replaces the device problem that is difficult to solve.
The power plant inspection of the Huazhong Numerical Control System of Shenyang Machine Tool Works found that one chip had abnormal heat. After the power is turned off, the power pin of the chip is disconnected and checked statically. The resistance of the power source to ground should be normal. The resistance of the chip to the ground is very small. The model of the chip, which is a non-standard model, was not found in many manuals. After line analysis, it was confirmed as the main component of the board (ring pulse distributor).