Similar electrical checks can be executed after having inserted spring, steel cylinder, sensing disk and quartz cylinder, using the layout on page 37 of the above reference, or even after having applied the membrane.
In case of short circuit (sound always on) possible reasons could be :
- A piece of metal is floating somewhere below the sensing disk (remedy: clean and blow compressed air)
- The inner longitudinal cable inside the blade (see p. 39 of the above reference) is broken and is in contact with the metal of the blade.
- The quartz cylinder has been forgotten – is missing.
Note that: if the spring or the steel cylinder are missing , then there will be no B (no sound in any position of the membrane; always silence when inflating beyond A).
