Kurzweil PC3x, Руководство по обслуживанию

Страница: 48 / 72

3-24
Disassembly/Assembly
PC3x Keyboard Assembly
Replacing a Natural/White Key
1. Verify the placement of the key spring.
2. Hook the front end of the key under the keyboard chassis.
3. Lower the key into position. Align the pivot with the hole at the rear of the key.
4. Push down on the key. It should snap into position onto the pivot.
Servicing the Keyboard Contact Boards
The Keyboard Assembly has nine keyboard stiffening brackets positioned along the underside
of the chassis. Each bracket is secured to the keyboard chassis using three screws: two small
machine screws through the chassis and one black screw through the contact board. To remove a
contact board, you must
fi rst remove the stiffening brackets.
1. Tilt the keyboard up (front edge of the keys facing down), and disconnect the fl at ribbon
cables that connect the Treble and Bass Contact Boards to the Connector Board. The
connectors are secured with tape. Peel back the tape to free the cables. Set the cables safely
aside and lower the keyboard.
2. 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. The stiffening brackets and Treble and
Bass Contact Boards are now visible.
Removing the Treble Contact Board
1. Disconnect the small ribbon cable that connects the Treble and Bass Contact Boards.
2. Remove the fi ve stiffening brackets. Remove the 15 screws that secure the fi ve brackets.
3. Remove the remaining 18 screws that secure the Treble Contact Board to the keyboard
chassis, and remove the Treble Contact Board.
Replacing the Treble Contact Board
1. Position the Treble 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 Treble to the Bass Contact Board.
4. Install the fi ve stiffening brackets. Install the 15 screws that secure the fi ve brackets.
Removing the Bass Contact Board
1. Disconnect the small ribbon cable that connects the Bass and Treble Contact Boards.
2. Remove the four stiffening brackets. Remove the 12 screws that secure the four brackets.
3. Remove the 18 screws that secure the board to the keyboard chassis, and remove the Bass
Contact Board.