The STR-DE635 is an AM/FM stereo receiver manufactured by Sony. The receiver has 355 watts of power and can accommodate up to three sets of speakers. The receiver also features a loop antenna and a PLL quartz-locked digital Dolby synthesizer. The system contains many electronic components, including processors, resistors, capacitors, diodes and transistors. If the stereo ever stops working and a transistor is suspected, the component can be removed and tested.
Instructions
1. Unplug the stereo receiver from the wall and unplug all speaker wires and cables from the unit.
2. Remove the case screws in the back of the unit with a screwdriver and then lift the case off.
3. Plug the soldering iron in and then lightly touch the connections holding the transistor that will be tested. As the solder connections melt, remove the transistor.
4. Identify the base, the emitter and the collector terminals on the transistor. They should be clearly marked.
5. Turn the multimeter on and set it to the diode test mode.
6. Place the positive meter lead to the base and the negative lead to the collector and then reverse the test leads. If the meter reads continuity in both directions or no continuity at all, the transistor is bad. Run the same test between the transistor's base and collector. Again, continuity should only run in one direction.
7. Test the collector and the emitter in both directions. If there is continuity in either direction, the diode is bad.
Tags: both directions, stereo receiver
