41309401TH Rev.4 559 /YesYesYesYesYesYesYesNoNoNoYesYesCheck CN1 connection.NoNoNoNoNoNo1: LCD not displayedInput of pin 27 of IC1changes from 0V to 5Vupon power onInput of pin 4 of IC503changes from 0V to 5Vupon power onInput of pin 5 of IC503comes down to 0V then goesback to 5V upon completionof copying6 MHz sine wave is inputbetween pins 30 and 31of IC1Signal of pin 2 of CN1changes to 0V or 5V whenthe key is pressedSignal of pin 5 of IC504changes to 0V or 5V whenthe key is pressedPin 1 of CN1changes to 0V or 5V whenthe key is pressedPin 5 of CN1remains at 0V or 5V uponcompletion of copyingReplace IC502.Replace IC504.Replace OSC or IC1.Replace IC503.Replace IC1.Replace IC1.Replace IC1.Check CN1.Replace IC504or IC505.5V is input to pin 4 ofIC5044.3 04W Board4.3.1 LCD display NG
