Page 7
Presto Digitation Installation Manual
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Step 6
Note:
If you are restoring a standard 88-note piano skip to Step 7
a. The key set can be modified for fewer notes. Begin by removing the springs from the
back of the keys to be eliminated. The keys will pop off by lightly pulling keys forward.
Remo ve the circuit board under the keys. Score the circuit board with a utility knife on
the green or tracing side of the board. Score four (4) times to go completely through the
tracings. Slowly bend the board until separated. Remount the board onto the key set,
then test to see if all notes work.
b. Usually one or two notes will not work. Follow the tracing to find keys needing to be
jumped. Using a utility knife, carefully scrape the green varnish off those traces. Scrape
down to the copper of the traces. At this time, solder a jumper wire between the two
traces.
c. Before installing the revised circuit board, cut the key set to desired length with a
hacksaw
Note:
In shortening a key set, the demo feature will no longer be operational.
Step 7
a. Using the paper drill template, drill the key set hold-down holes. The template is the
exact size of the key set. Center the template between key blocks. If the key set is
wider than the original keys, it will be necessary to trim one of the key blocks.
b. Tape the templa te down leaving 1/8" between the key slip and the front of the key set
template. Drill through the keybed using a 3/16" bit at the "x" markings.
c. If the key set is too high, there are two choices:
d.Counter sink the holes using a 1/2" drill the proper distance to allow the key set to
out from the connector, they will break off into tow groups of two wires. These wires
are to be connected to the tabs on the speakers. The tab marked with a red dot
receives either the white or gray wire. The remaining tab will receive the black wire.
f.
Once the connections have been made, make sure that there are not objects lying on
the circuit boards that shouldn't be , i.e. screws, tools, a car jack, etc. If there is
nothing on the boards that could cause a short circuit, you may plug the unit in, power
up and give it a try.
g. Please use caution when testing this unit. There will be exposed circuits in this test
stage, and there are things that can and will bite if you let them.
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