one
Fuse tube blown: carefully check the various components on the circuit board to see whether the appearance of these components is burned or there is electrolyte overflow, smell - smell whether there is odor; Then measure the resistance value of the power input to see the local short-circuit phenomenon; Then measure whether the power filter capacitor can be charged and discharged normally, whether the switching power tube is broken down and damaged, whether the UC3842 and the surrounding components are broken, burned, etc., if the components are damaged, you can replace them.
two
No DC voltage output or voltage output instability: First, use a multimeter to measure whether the various components of the high-frequency pulse transformer are damaged, to exclude the breakdown of the high-frequency rectifier diode and the short-circuit of the load; Then measure the DC voltage of each output to see if the control circuit of the power supply is faulty; Then use a multimeter to statically measure whether the rectifier diode and low-voltage filter capacitor in the high-frequency filter circuit are damaged. If the above components are damaged, replace the new components to eliminate them.
three
No DC voltage output, but the safety wire is intact: First judge the charger's change control chip.
You can replace fuses, transformers, charging chips, or reconnect lines.
Generally, the charger is damaged by short circuit or open circuit, the fuse is burned, the fuse needs to be replaced with the same specification, the transformer is burned, and the transformer is replaced with the same specification.
In this case, the charger should be replaced in time, because it is more troublesome to repair, and it is easy to cause damage to the battery, and even cause a fire.
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The overcharge of the lead-acid battery will cause the battery to lose water, resulting in the charger has been showing a red light, the solution to this situation, add some supplementary liquid to the charger appropriately, be sure to find professional maintenance personnel to add, do not replace yourself.
Generally, it can be repaired from two aspects. Water bottle charger fan does not turn, his problem is there are two, one is whether the fan itself is damaged? The other is whether the power supply sends a fan?
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During maintenance, you can unplug the charger, take a multimeter, in the case of power, measure whether the fan has voltage, if there is voltage, then the power supply of the fan is no problem, the problem is in the fan itself, the need to repair the fan, or replace the fan.
The battery charger is broken, just replace it.