Troubleshooting turret letter tray

When the electric turret CNC lathes appear constantly turn, first eliminate the program error, and then observe the position of the magnet on the turret is correct, then check whether the power supply and communication lines leading to preclude normal letter disk turret control line failure . If these basic checks did not find the problem, then use the Replace method to replace the disk to see if a good letter back to normal, so you can quickly determine the scope of failure. Test to determine when the electric knife on the knife could not find a place, first check with the knife phase corresponding communication path is normal, then the use of change wiring methods, ie fault pockets wiring connected to the normal position of the terminal knife is a line problem or a letter disk problem. Higher probability of transmitting disk failure, although its disassembly is not complicated, but its accessories are not easy to buy in some areas, and parts prices relatively high. Due to the internal structure of a letter tray is not complicated (Fig. 4), the circuit shown in Figure 2, it can be to repair the fault case letter tray, the key issue is to identify the point of failure and how to replace a letter tray element .

First, determine the letter tray is open fault or short circuit fault, the letter of the disk access is less than 24 V DC current source, with the multimeter resistance profile, with a red pen then transmitting plate negative (flag "- "), black pen then dispatch any one point four disc Hall device output terminal on the outside of the magnet close to the Hall sensor observe pointer deflection (note the polarity of the magnet), which, if it does not deflect Hall device can determine the circuit is damaged, if the measured deflection of the four positions are not likely to be short-circuited or circuit resistance, Zener diode failure. As long as the replacement for the open fault Hall devices can be; letter tray for short-circuit fault resistance and Zener diode can be checked to determine if there is damage repair value. After determining fault, the upper plate cover letter opened, with a small bench (or hand drill, drill diameter optional 2. 5 mm ~ 3 mm) Carefully sealing resin point of failure on the drill out (be careful not to damage to the device pin). Physical part will be damaged by the partial nose pliers Hall device was cut (be careful not to cut the device pin) and straighten the pin, the pin cf letter tray leaving New Hall device pin forming a U-shaped (note the direction of the Hall device mark) as shown in Figure 5, the pin will be determined separately after sealing with hot Replies good location, and cover the cover, letter tray service is completed. Other faults may refer to this method, the key is not to cut the pin bad elements on it.