Memorex MT2025D Service Manual - Page 8

Maintenance Service and Trouble shooting 3 Horizontal bright line Make R429 open. Multimeter is at range RΧ1K. Red probe connects to ground. Touch No.5 of IC401 with black probe. Bright line flashes for a moment Yes Check to see if the voltage of pin 11 and pin12 of IC201 is normal No Check to see if voltage of pin2 at IC401 is normal Yes Change IC201 and repair circuit Normal No Inspect IC201 and peripheral components of IC201 Yes Check to see if the deflection yorks are connected, C404 is open or weldless. Inspect peripheral component of IC401 and IC401 itself No Inspect +28V power supply 4. No sound and picture Snowy noise exist Not exist Check to see if RAGC is at 00 mode Exist Check to see if voltage output available at tuner Yes Enter D-MODE with customer remote controller. Make RAGC tuned to 25 or so. Noise on picture just disappears. No Inspect SAW101、 IC201and PIF part Yes Antenna or tuner is abnormal No Inspect the circuit from CPU to tuner 3 PDF pdf Fact or y Pr o wÿww. f i nepr i nt . com. cn