Solving the remaining problems

As said before I had to clean the lower keyboard again because I was not thorough enough the first time. I used the same method as for the upper keyboard http://eminentunique310restauration.blogspot.com/2008/10/cleaning-upper-manual-key-contacts.html.
This time the result was perfect.



Also in the upper keyboard print there where two defect germanium diodes. I replaced them the same way as for the lower keyboard. http://eminentunique310restauration.blogspot.com/2008/09/repairing-non-sounding-note.html

Troubleshooting string ensemble - part II

Problems to be solved on the string ensemble :

• Sustain of the lower manual does not function together with the 4' or 8' lower manual string ensemble
• Sustain of the lower manual does not function when 'Lower Manual Sustain' is switched off
• When the sustain on the upper manual is switched 'on', the sustain of the lower manual does not function any more.

On the string ensemble print I found a faulty germanium diode. Lucky I still had some spares from the last repair. When I placed a bridge over the diode the sustain functioned normal again. The diode refused to let the current pass.

I desoldered the diode and replaced it by an OA90 germanium diode that I had lying around. Problem is fixed.

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.