Some customers bought the carving machine in the future, the reaction carving machine has been launched, but the equipment can not operate, so how to deal with it?
Fault treatment plan:
First, the stepper motor power supply tube with appropriate voltage and current power is used to further recognize the problem of the chip.
Secondly, the power supply pin of the chip is recovered, and the light-emitting diode circuit is used to replace the windings of the stepping motor to simulate the load. After the power is turned on, the light-emitting diodes are all bright, that is, the windings are all energized. This is an input step pulse that does not meet the line requirements and has no reverberation, thus acknowledging that the chip is damaged. But the chip city
In the case where there is no space on the field and the space inside the driver housing is allowed, a ring pulse generator is planned by using a combination line, that is, a combination of a D flip-flop and a NAND gate existing on the hand, and is fabricated on a small printed board. Undo the original chip and mount the small printed board on the pad of the original chip through the pin.
The LED is still used to simulate the load. After the power is turned on, the stepping pulse is applied to sequentially emit light in the phase sequence.
Finally, the simulated load is removed, the host is connected, the power is turned on, and the device is operating normally.
Fault manifestation:
Once launched. The device does not work. When the repairman checked, he found that a power tube was damaged, but because there was no data, the effect of the tube could not be known. It was thought that it was a power-driven pre-propulsion, and replaced with a power tube. After power-on, the safety was again burned and replaced. The pipe on it is also damaged.
Analysis of the problem:
The initial analysis of the carpenter carving machine is safe and repeated, and is checked by professional repair personnel. The drive must have some abnormally high current and see a power tube damage. But the effect of the tube is not clear. In fact, the tube is a stepping motor power supply driving tube, and the stepping motor is a high voltage starting, and thus has to withstand high voltage and large current. Statically, it is found that in the circuit of the pulse ring distributor, the resistance from the power supply to the ground is small, but there is no short circuit. According to the number of components in the line and its power consumption, the resistance of the power supply to the ground should not be so small, and it is suspected that the existing components in the line are damaged.
The floating knife head looks like a text on the plane of the carving, and can float up and down within a certain range. The main shaft can slide up and down in the Z-axis direction. When using the floating cutter head, it pays attention to adjusting the distance between the floating cutter head and the cutting edge, and can be carved on a large uneven surface while maintaining the depth of the carving. Many domestic carving machines say that their carving machine has a floating knife head, but some floating heads are only a simple knife nose, which is used to press the object to be processed, and it can not achieve the real effect, otherwise it is The motor is too heavy to float, and may scratch the surface. Otherwise, it is a problem that the motor is light and powerless. Through research and development, Roth Computer Machinery Co., Ltd. finally dealt with this problem, using a high-powered motor, and the floating part is only the rotor of the motor, so the RT4500 is used to engrave the badge, there is no problem of depth. Now, the plan has requested national patents. Found a chip abnormal heat. After the power is turned off, the power supply pin of the chip is cut off and powered on. Static view, power to the ground
The increase in resistance should be normal. The resistance of the chip to ground is measured to be small. Check the type of the chip, which is a non-standard type. Many manuals do not find the line profile, which is recognized as the main component of the board: the ring pulse distributor.
