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these is crystal diode (germanium) check the image probably all 4 with same measurement.. (i presume ) If you have multimeter , desolder all 4 select diode modality and make the measurement ..if 1 or more is with different value replace. |
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thank you a lot for that information, orx65. you give me a hope. ;)
is it really necessary to desolder the diodes first before measuring them? i did the measurement already - you can see the values on the picture i got from all the diodes (more or less same values). do all diodes have to show the exact same value? or is it not a problem when one diode shows 0,619 and other one 0,625? best regards |
hi
yes for correct measurement is necessary desolder them as any other different electronic component..unfortunately i don't have schematic of this synth i know that a few difference can to be a normal tollerance anyway the correct value for germanium diode is 0,5 - 0,8 v ..do you want to be sure ? replace all 4 ..example link http://www.ebay.it/itm/AA117-Diodo-a...sAAOSwEZdaCY1T let me know , good luck |
Here's a photo of the 2nd board - in that board comes the signal from the contact PCB. Any ideas what component from this board could cause the dead key?
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i'll try to resolder all solder joint incoming from red connector , i realize that it is an empirical solution but considering that we do not have the schematic ...
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curious?
did you ever find fix? similar issue here
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