The multimeter DC current range has no indication fault repair
reason:
①Desoldering or short circuit of the moving coil in the meter head;
②The resistor connected in series with the meter head is damaged or desoldered;
③The meter head is short-circuited.
repair:
①Remove the meter first, take out the coil, and carefully observe the lead wires at both ends of the moving coil. Because the moving coil is desoldered or broken, most of the wires are drawn at both ends of the moving coil. After finding the break, use a 15W220V soldering iron to solder it firmly. If the coil is broken inside, you can refer to this book for repair;
②Replace the bad resistor connected in series with the meter head, and re-solder the desoldering resistor firmly;
③ Check the branch circuit of the meter. If there are wires and other objects that cause the short circuit of the meter, they should be excluded.
