06.04
Unknown
This is a vintage ( circa 1980s, based on the date marked on the IC chips, in fact 1983 ) 7 segment LED alarm clock radio that I decided to give a new lease of life. The clock portion is bad as the time setting switches are stuck and the clock cannot be set. Other than that the AM/FM radio portion seems ok.I hooked it up to a larger 2-way speaker and this gives a much clearer and richer sound. The piano sound just perfect. The sound stage is excellent for a desktop radio.The reconfigured AM/FM radio show signs of trouble after a few hours of use with the new speaker. Some testing reveals a dried out capacitor and a bad transistor. The transistor is used to turn on the radio via the clock or a switch. The fault prevents the power supply from reaching the radio circuits.The capacitor is replaced...
