Remember SmokeIsBad (sparks too!)
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TopicRepair
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+OK, just as an addition to this, I have successfully 'zapped' the dendrites from my A-100 a couple of times when I had a 'short' on the 'blue' K wire leading from the AO-28 pre-amp to the percussion switches. I tried the multiple 9v batteries trick without success. What worked for me was using a 12v car battery charger, these normally output a partially rectified voltage so they have a healthy AC element that produces a good 'flash' spark ideal for blowing those dendrites to oblivion. Mine has tapped variable current settings... using the lowest 1 amp (@12v) setting worked. My percussion was working, but no decay... also I had no 25v + voltage on the K terminal when the percussion switch was 'on'. I removed all four wires, blue (K) and the red, brown and green wires adjacent (organ off and unplugged). Earthed the negative side of the battery charger to the AO-28 chassis and zapped each wire in turn for a couple of seconds with the four percussion control switches in all positions. Re-connected the wires... measured the 'K' voltage with the perc switch 'on'... and low and behold I had my 25v + back on the 'K' terminal (dendrites zapped :) ) I then re-adjusted the percussion level cut-off, tried the percussion and all is working 100% again (until the whiskers grow back again). It's a quick and dirty fix... but dragging that percussion control box out for a proper clean is a daunting prospect! DaveH-UK
