Once a key has been depressed, the soft spring remains under the tube. It is backed by
the short stiff spring to give it sufficient tension to hold the key down. When the next preset
key is depressed, the cradle is forced down and outward, permitting the previously
operated key to come up, but again locking the one last depressed.
If two preset keys are depressed at once, both will lock down. The cancel key with its long
stiff spring is then used and forces the cradle down, causing all preset keys depressed to
return to their normal position. As there is no locking spring on the cancel key, it will
immediately return to its normal position.
Replacement of Preset "Cradle" Return Spring
If it is determined that a new return spring is necessary on either manual, remove the
console top and music rack and take the bolts holding the manual assembly out from the
bottom of the console. Raise the upper manual, or both manuals, as necessary, to gain
access to the screws holding the left hand end block of the manual needing the
replacement. After removal of the end block, the end of the cradle assembly, as well as the
broken return spring and its bracket, will be visible.
Remove the bracket and broken spring and discard. Replace, using Part No. AO-21709-0.
Install the new assembly so that the felt pad is above the preset cradle, and the flat spring
is below the cradle, as shown in Figure 18. Clamp it in the center of the range of
adjustment provided by the slot. Check all preset keys for operation, and adjust the
position of the new assembly in case any keys do not operate correctly.
16
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