Hitachi CRP - 450 - d television AFT switch controlled by preselector door, open the door, filters AFT switch set off states, close the door, filters ON the AFT. Tuning will preselector door opened, the TV set tuned accurately, shut the door after the AFT control chart no, explains drift too far, caused by disorder of AFT circuit. The main check AFT90. Phase-shift circuit tuning element is disorder, damage, if the phase-shift circuit is normal, it is the inside of the IC201 AFT circuit. ek2service manual download site
(1) the received signal, adjust the TV frequency accurately, shut the door, and filters adjustment phase shift network L001, image, sound gradually returned to normal. To control a sensitive point (cut to have influence on image), and open the door closed, image basically remain unchanged, the phase shift network is accurate adjustment. This is the use of television signal visual adjustment method.ek2service manual download site