Memorex MT2025D Service Manual - Page 7

Maintenance Service and Trouble shooting 2 No raster Normal Whether G2 voltage is normal Abnormal Test filament voltage Normal Abnormal Test the base voltage of Q402 Normal Abnormal Check the voltage Heater Resistor of all pins of SK501 open Normal Abnormal Video amplifying board is abnormal Inspect the circuit from pin51 、52、 53 of IC201 to video amplifying Check to see if be voltage of Q402 is existed? YES NO Check the circuit from pin15 of IC201 to Q402 Check the voltage of Q402 collector is normal Higher Lower InspectT402、R427 etc. T401, D402 or C419,C420 are broken Q402 is not well welded or open Normal Abnormal Check to see if +8V voltage is normal at PIN 10 or 14 of IC201 Change wrong component or check Normal Abnormal Check X201、IC201 and peripheral circuit of IC201 2 Check +8V ,+5V power PDF pdf Fact or y Pr o wÿww. f i nepr i nt . com. cn