Troubleshooting string ensemble

The problem to be solved :

• The 8' button of the upper manual string ensemble is supposed to switch on the 8' strings. The strings however are only heard in the background, and do not sound loud enough
• With the 4' button of the upper manual string ensemble the same problem occured

Again searching the problem I found a non functioning capacitor.

The capacitor of 2,2 µF shorted the sound of the upper string ensemble to the ground. Replacing the capacitor solved the problem.