David Popovits_

Make yourself a suitable cable. One side 1/4" mono and the other side 1/8" stereo plug for the MD. Short the tip and the ring and you'll hear from both sides (although in mono). David Popovits

Please do not use alcohol, as some MD lens are plastic made (not glass) and you may make thinks worse. After cleanning try to readjust in test mode. If it wouldn't help go to a good repair shop or buy yourself a new MD David Popovits

Further vto my answer in the repair board, i can tell you that in almost all cases the amplifier IC is to be replaced. If you are lucky it is a matter of resoldering the amplifier IC. Pay attention; the space between the pins is very small and you may cause severe problems if you don't have the correct solderring iron and good knowledge in thius field. David Popovits