... unit) are under microprocessor control. We discuss both the receiver and transmitter circuits and the related troubleshooting procedures in the following paragraphs. ... The remaining contact of each switch is connected to a specific input at pins 11, 12, 13, 14, and 15ofICl. When a given key is pressed (enabling ... The combination of both signals turns Q7 on activating IR diode D2. (Since two sig18 17anbsp;...
|Title||:||John D. Lenk's Troubleshooting & Repair of Microprocessor-based Equipment|
|Author||:||John D. Lenk|
|Publisher||:||Sams - 1986-01-01|