Walkie-talkie maintenance, the first measurement of the main points of the CPU control board DC voltage, the display control board by measuring the voltage and the normal value of a number of points do not match, to determine where in the end is the problem. And then shut down to measure the resistance, after repeated tests, and finally found that, when using the multimeter RX1 gear measurement of intermediate frequency circuit board and display control board ground between the resistance, found that the two places between the ground has a resistance value of 600 or so, is obviously a board not connected to the end of the ground due to good.
After using a copper wire to the IF board and the control of the ground connection welded, the walkie-talkie boot test, all display functions are back to normal, troubleshooting.
  Walkie-talkie with its good quality is widely used in public security and other communication networks, but the use of a long time, often occurring speaker reported bad failure. The speaker is small in size, it is usually difficult to buy the same type of speaker. According to years of experience in repair, can be used in the following ways to repair.
  Carefully remove the speaker diaphragm. Found due to the factory to use glue to the voice coil wire fixed to the diaphragm, the other side of the glue sealed in the bracket, due to vibration caused by the diaphragm to the wire on the frame broken, while the voice coil is intact. When repairing, carefully remove the wires from the diaphragm. Carefully remove the wires from the diaphragm. Solder the wire with 0.07mm enameled wire and fix it to the diaphragm with gripping glue. Pierce the center hole of the powder holder and fix the enameled wire on both sides of the holder. Solder the wires to the soldering lugs.