When a loss of ac power occurs, a small nicad battery, which is charged during normal tuner/timer operation, feeds power to IC103. This IC is a ... 18V Clock Approx 300 kHz Jta r-A/W-i During timer problems check for 50Hz waveform ... Block diagram of microprocessor, clock, and power source (courtesy of RCA Corp.).
|Title||:||Troubleshooting techniques for microprocessor-controlled video equipment|
|Author||:||Robert L. Goodman|
|Publisher||:||TAB Books Inc - 1987|