Disassembly/Assembly
PC3x Keyboard Assembly
3-25
Replacing the Bass Contact Board
1. Position the Bass Contact Board on the keyboard chassis. Be sure that the rubber key
contacts line up properly through the holes in the keyboard chassis.
2. Install the 18 screws that secure the board to the keyboard chassis.
3. Connect the small ribbon cable that connects the Bass to the Treble Contact Board.
4. Install the four stiffening brackets. Install the 12 screws that secure the brackets.
Connecting the Keyboard Contact Boards
1. Turn the keyboard over to its normal playing position.
2. Tilt the keyboard up (front of the keys facing down), and connect the
fl
at ribbon cables
that connect the Treble and Bass Contact Boards to the Connector Board. Be sure to
reapply the tape to secure the connectors. Lower the keyboard.
Removing the Keyboard Contact Strips
1. Place the keyboard upside down on a
fl
at soft surface. Be sure that the keys are resting on
a soft surface to avoid scratching or other damage.
2. Follow the procedure to remove the Bass and Treble Keyboard Contact Boards.
3. Examine the keyboard contact strips and look at the design of an individual contact. The
top portion of the contact has two indentations. One indentation is deeper than the other.
When replacing the keyboard contact strips, the deeper indentation is always positioned
toward the rear of the key.
4. The keyboard contact strips have mounting pegs that secure the contact strips to the
keyboard contact boards.
5. To remove a keyboard contact strip, gently lift and free the strip from its position. Be
careful not to rip or damage any contact in the process.
Replacing the Keyboard Contact Strips
1. Position the contact strip on the Keyboard Contact Board that you are servicing.
Note:
Be sure that the deeper indentation is positioned toward the rear of the key.
2. Line up the contact strip mounting pegs with their respective mounting holes on the
keyboard contact board.
3. Using a small blunt-end tool (Q-Tip, toothpick, etc.), gently push the mounting pegs
through the holes. Do not use too much force or use a tool that can poke a hole through
the mounting pegs. However, be sure that the mounting pegs are installed through the
holes and the contact strip is
fl
at against the PC board at each peg location.
