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Power supply repair methods
1. High-voltage ignition failure; high-voltage wire connector is too close to the metal casing.
2. No light, fan not spinning. Fuse blown.
3. Forced light emission is possible, but not controllable by the motherboard. The low-voltage control section in the preamplifier is faulty.
4. Current cannot be adjusted; the current control section is faulty.
5. Fuse keeps blowing, indicating a short circuit in the power transistor.
Several methods for repairing laser power supplies are as follows:
1. Replacing key components method. If there is no light emission, try replacing the amplifier tube 460 or 450 first, then consider replacing the high-voltage package.
2. Voltage detection method.
3. Power-on observation method.
Troubleshooting tips for CO2 laser power supplies that do not emit light:
1. First, power on and observe the fault conditions of the laser power supply.
2. First determine if the cooling fan is spinning: If the fan is spinning, it indicates a fault in the high-voltage circuit; conversely, if the fan is not spinning, it indicates a fault in the control circuit.
3. When the fan is spinning, check if there is voltage output after the 220V power supply is rectified, then check if the power amplifier tube is burnt out, and whether the voltage after power amplification is a normal 400-600V DC pulse. If normal, it can be determined that the high-voltage package is faulty and should be replaced.
4. When the fan is not spinning, check if the voltage after bridge rectification and voltage regulation is normal, and then check if the voltage after transformation is normal. Usually, the control chip is prone to failure.
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2021-07-19
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