Acer AL702 AL702 Monitor Service Guide - Page 24

A LC502 12. Checking the audio circuit Is a cable with the host PC connected? OK NG Failure point Audio cable disconntction. Aren't the setups of the host PC a minimum and off? OK NG Failure point The setup of the host PC is changed. Is correct output waveform being inputted from JK011 pin 2, 3 of the host PC? NG OK Failure point Audio cable disconntction. Is the waveform which is the same as JK011 being inputted to I001 pin 4, 9? NG OK Failure point 1) Printed wire broke between JK011 pin 2, 3 and I001 pin 4, 9. 2) R040, R041 open. 3) R042, R043 short. 4) C040, C041 open. Is output wavefrom being outputted in I001 pin 14, 17? NG OK Is 15V supplied to I001 pin 15, 16? NG Failure point 1) Speaker cable disconnectionOK 2) Speaker failure Proceed section 9.1 "No power on". Is mute/STD-BY low level at pin 11, pin 12. NG OK Proceed section 11 "Checking the operation of CPU". Is Variable DC volume control at pin 6. OK NG Check I002 pin 8 is 5V DC. Failure point I001 failure. NG OK Proceed section 9.1 "No power on". Proceed section 11 "Checking the operation of CPU". Trouble Sh ooting Page 15