First check if the charger output plug and the battery pack's charging plug are plugged in. If there is no problem, check if the fuse tube on the battery case is open or the fuse holder is loose. In addition, some models can be charged after the battery lock is turned on. If the above faults are eliminated, consider whether the charger output line is open. You can measure the no-load output voltage of the charger with a multimeter voltage block (200V block), which should be 41-44V (with 36V battery varies with charger) If not, it may be that the charger output line is open, and the charger is turned on, and an output line is replaced to eliminate the fault. Note: When replacing the charger output line, be sure to pay attention to the positive and negative poles of the original machine.
Second, the power indicator is not lit, the charging indicator is not bright
Check if the charger input power plug is connected to the mains. Plug the charger input plug into the normal power socket and try it. If the situation is still the same, open the charger case and observe if the fuse inside the machine is broken. If there is no break, first check if the power input line is good. After troubleshooting the power input line, check whether the components near the high voltage area on the circuit board are soldered. If there is any contact failure in the fuse holder, check the transformer T1. Whether the triode V1, V2, etc. have a virtual soldering phenomenon. In addition, R5 or R6 open circuit will also cause the above faults. If the fuse inside the machine is broken, do not replace the large amp fuse tube (the fuse tube of the charger is generally 2A), and should focus on checking D1-D4, V1. V2, R4, R7 and D15, D21 are damaged. If there is damage, the same type of replacement can be used. Please note that when the above components are damaged, one or two of them may be damaged at the same time. Sometimes, several components may be damaged at the same time. It is necessary to check and replace these components one by one before powering up.
Third, severe fever, and even the burning deformation of the shell
This is mainly caused by the failure of some users to carry some components and loose parts. The main performance is as follows: When C18 looses the virtual welding, it will cause the working state of V1 and V2 to be abnormal. The heat is very large. When the battery case is deformed seriously, the circuit board is burnt, causing V1 and V2 damage. C18 can be re-welded and checked. V1, V2, R4, R7. If the fault cannot be eliminated, check whether there is an open circuit in D15 and D21. In addition, some manufacturers use a double diode for the output rectifier. One of the open circuits also causes the above fault. Sometimes the fault will cause V1 and V2. One is damaged. Check and replace at the same time.
Fourth, the heat is large and accompanied by abnormal noise
The cause of the fault is caused by damage to the output stage damping resistance R31 and C17. In addition, C12 open circuit or virtual soldering can also cause the above faults.
5. There is an abnormal noise during work, and there is no charge.
Check if there is any solder joint or damage on C8 on the circuit board. Generally, replacing C8 can solve it.
6. There is abnormal noise during work, and the power indicator and charging indicator are dark and flashing.
The cause of the malfunction is that the IC1 is damaged. Be careful when replacing it. Do not damage the copper foil of the printed board. After the replacement is normal, adjust the R28 so that the output voltage of the charger is within the normal working range.
Seven, the output voltage is very high
The output voltage is very high (greater than 50V), and the cause of the fault is C15 short circuit or R26 open circuit. In the specific judgment, the "1" pin voltage of the IC1 integrated circuit can be measured.
Note: After replacing R26, R28 should be readjusted to keep the charger output voltage normal.
Eight, the output voltage is normal, but the charging current is very small
Check if R30, R11, and R13 are in poor contact or damaged. If it is normal, please replace IC1 to eliminate the fault.
Nine, the output voltage is normal, the charging indicator has no indication or the indication is incorrect.
It is usually replaceable due to damage to the IC2 or damage to the LED2.
Ten, the output part of the copper foil is blown
When the charger is turned on, it is found that the copper foil of the charger output part is blown. This is usually the result of reversing the positive and negative terminals of the battery, and the failure caused by this will cause damage to many components of the charger. If the charger fuse is not broken, usually replace the R30, IC1, IC2 and then connect the broken copper foil to restore normal. If the fuse of the charger is broken, the fault is more serious. D1-D4, V1-V2, R4, R7, etc. may be damaged, and need to be replaced one by one after measurement.