![]() If the voltage on the K terminal seems to be behaving itself, skip the remainder of this section, and see the Trouble in the Preamp section below. Now press any upper key and the reading should go to 0. ![]() Measure the voltage on the K terminal with no keys pressed. Select the B preset, turn the percussion to ON, NORMAL, SLOW, SECOND. If the voltage is very low or missing, the switch is the problem. This should go to 0 when any key is pressed. With no keys depressed you should see a positive voltage of 25 to 30 volts. This can be easily verified by measuring the voltage on the K terminal of your preamp (blue wire) with the percussion on and the B preset selected. Our old friend metal migration (ZincDendrites) is almost always the cause of percussion problems. The ground comes to this terminal from the 1' busbar (white wire) through the percussion switch. The percussion gate is triggered by grounding the K terminal on the preamp.
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