The woodworking engraving machine starts, the equipment can't run normally.

Some customers bought the engraving machine, the reaction engraving machine has started, but the equipment can not run, how to solve it?

Troubleshooting:
First, the stepper motor power supply tube with the same voltage and current power is replaced to further confirm the problem of the chip.
Secondly, the power supply pin of the chip is restored, and the winding of the stepping motor is replaced by a light-emitting diode circuit as an analog load. After power-on, the LEDs are all on, that is, each winding is energized. This is an input step pulse that does not meet the line requirements and does not respond, so it is confirmed that the chip is damaged. But the chip city
On the field, if there is no space in the drive housing, a ring pulse generator is designed on a small printed board by using a combination circuit, that is, a combination of a D flip-flop and a NAND gate existing on the hand. Remove the original chip and mount the small printed board on the pad of the original chip through the lead.
The LED is still used as the analog load. After the power is turned on, the stepping pulse is applied to sequentially emit light in the phase sequence.
Finally, remove the analog load, access the host, power up, and the device is operating normally.
Fault performance:
Once started. The device cannot be operated. During the inspection, the maintenance personnel found that a power tube was damaged, but because there was no data, it could not figure out the function of the tube. It thought that it was a power-driven pre-push, and replaced it with a power tube. After power-on, the safety was again burned and replaced. The pipe on it is also damaged.
Failure analysis:
The initial analysis of the woodworking engraving machine was repeatedly blown and cleaned by professional maintenance personnel. The drive must have an abnormally large current and check for a power tube damage. But the effect on 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, so it is necessary to accept high voltage and large current. Static inspection, in the circuit of the pulse ring distributor, the resistance of 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, so it is suspected that the existing components in the line are damaged.
As the name implies, the floating cutter head is on the engraving plane and can float up and down within a certain range. The spindle 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 engrave on a large uneven surface while maintaining the same engraving depth. Many domestic engraving machines say that their engraving machine has a floating cutter head, but some floating cutter heads are just a simple knife nose, which is used to press the object to be processed, which does not play a real role, otherwise the motor is too Do not float again, or scratch the machined surface. Otherwise, the motor is light and the power is not enough, which creates a problem. After research and development, Rote Computer Machinery Co., Ltd. finally solved this problem. It uses a high-powered motor, and the floating part is only the rotor of the motor. Therefore, the RT4500 is used to engrave the badge, and there is no problem of different depths. At present, the design has applied for national patents. A chip was found to be abnormally hot. After the power is turned off, the power supply pin of the chip is cut off and the power is checked. Static check, power to ground
The increase in resistance should be normal. The resistance of the chip to ground is measured to be small. Check the model number of the chip, which is a non-standard model. The line analysis is not found in many manuals, and it is confirmed that it is the main component in the board: the ring pulse distributor.