Our last job is to clean the key contacts on this Roland JUNO-60.  Many of the notes didn't trigger reliably when pressed.

The JUNO-60 opens up by taking out two screws on each of its end blocks.  The top panel is hinged at the rear and swings up as seen here.

To loosen the keyboard assembly, take out seven screws from the bottom of the unit.

The screws are pointed out in this photo.

A green, ground wire runs from the left end of the keybed to a bolt on the power supply transformer.

Remove the bolt nut and slip the wire's ring terminal off the bolt, so the keyboard can move further away from the rest of the synth.

Remember to replace this ring terminal before you close up the unit.

On the right end of the unit, cut a cable tie that holds down a wire bundle running from the Keyboard to the JUNO-60 Voice Board (see right).

Now you can move the keyboard forward and stand it up as shown here.

To steady the keyboard, set its mounting brackets on the front lip of the case, as shown here.

Now you can reach and clean the JUNO-60 key contacts while the unit is turned on.  You can hear which contacts need cleaning and know when they're clean.

We use cotton swabs to wipe tarnish off the contacts of any keys that trigger intermittently.

First, we flatten the cotton buds with a pliers, as shown here.

Here we poke the flattened swab in between the bus bar and the leaf-spring contact of one key.

Wiping with a dry swab worked fine but you can also use a small amount of isopropyl alcohol on the tip (90% or higher solution) to remove more serious oxidation.

Use a piano-like patch (short attack and decay) and press the keys lightly to make any triggering problems more noticeable.

INSTRUCTIONAL VIDEO:

This 39 second YouTube video demonstrates the cleaning process.