you need
  • Ohmmeter, screwdriver, soldering iron, solder, laboratory power supply, a thermometer, heat-conductive paste.
Before starting the repair amplifier, remove it from the vehicle.First, remove the main fuse of the power supply wires.Disconnect all power, acoustic and signal wires.If these wires are the same color and the same diameter, be sure to label the plus and minus.
Wipe the housing of the amplifier from dust with a damp cloth.
Dismantle the amplifier.To do this, remove the bottom cover, remove the retaining straps of the output transistors and the power supply key, unscrew all the fastening screws that hold the board in the case.Carefully use a flat screwdriver to separate the output transistors of the rubber-pads, then pull the card out of the case.
With ohmmeter locate
faulty output transistors.To do this, they will have to vypayat sincefeeder bus amplifiers are usually combined, and one knocked transistor will short-circuit the whole power circuit.
Carefully inspect the track and other parts of the amplifier output stage.Crushed transistor could hurt any more details.Use an ohmmeter to check the driver stage transistors and interconnecting resistors, as well as the tracks on the circuit board.
While the output transistors are not soldered into place, apply a test switch with a laboratory power supply at 12V to ensure serviceability of the voltage converter, built-in amplifier.If the green LED lights up, the voltage converter in order.
Replace any defective parts the same as or similar.
Inspect space rations replaced parts.Rations should be qualitative.
with a thermometer, measure the temperature of the body of the output transistors, and record the value on paper.
Make a test switch amplifier.The green LED should light up.Enabling be careful not to put your hands on the body of transistors, asbetween their hulls total operating DC voltage of 50 volts or more.Turn on the amplifier in the 30s, and then turn it off and measure the temperature of the body of the output transistors.If the housing temperature of transistors no more than 2 degrees higher than it was, then you can safely collect the amplifier.
Unplug all cables from the amplifier, grease heat conducting paste all heat sinks the output transistors and the power supply key, put them rubberized pads that were on them or replace them with mica gaskets.
Tighten mounting bolts back all that hold charge, and then install the fastening straps turns the output transistors and the power supply key.After each set trims, control the absence of electrical contact with the housing body of the transistor amplifier.Then install the bottom cover.
Install the amplifier back to the car, making the correct connections.