Replacing The Engine Board; Removing The Mod Wheel Assembly - Kurzweil PC2 Series Service Manual

Replacing the Engine Board

1. Place the Engine Board in position on the top enclosure.
2. Align the center screw hole on the front panel edge with the thread marks in the extrusion
and install the screw that secures the front panel edge. See Figure 4-10.
3. Place the PC board clamp in position. Align the center screw holes of the PC board clamp
with the thread marks in the extrusion and install the two screws that secure the PC board
clamp.
4. Connect the flat ribbon cable from the LCD to J406 on the Engine Board. Be sure to install
the cable locking clip.
5. Connect the stranded wire cable from the LCD to J405 on the Engine Board.
6. Connect the stranded wire cable from the Connector Board to J402 on the Engine Board.
7. Connect the wire trap flat ribbon cables in the following order.
Caution: Be sure to look for the marking on the edge of the cable denoting Pin 1 and that
you match it correctly with Pin 1 on the board. Make certain that the wires are straight
prior to inserting them into the connector and that each wire is correctly inserted into its
respective position.
Note: Be sure the sides of the connector are lifted. Insert the flat ribbon cables into the
wire trap connectors and push down the sides of each connector to lock the cable into the
connector. Gently pull each cable to verify that it is locked into its connector.
Insert the ten-wire flat ribbon cable from the Connector Board into the wire trap connector
at J403 on the Engine Board.
Insert the five-wire flat ribbon cable from the Connector Board into the wire trap
connector at J412 on the Engine Board.
8. If the unit you are servicing has a PCX-1 Board, follow the procedure on page 4-13 to
install it.
9. Follow the procedure on page 4-8 to install the left enclosure support wall.

Removing the Mod Wheel Assembly

1. Refer to Figure 4-11 on page 4-19. Slide the left side of the unit forward off of your work
surface so that you can access the four screws and washers securing the assembly to the
bottom enclosure. Remove the four screws and washers.
2. Slide the unit back onto your work surface.
3. Lift the Mod Wheel Assembly up, approximately two inches. Nylon reinforced tape
secures the Aftertouch flex cable(s) to the bottom enclosure. Peel back the tape from one
side and disconnect the cable(s).
Note: If you are servicing a PC2, one flat flex cable attaches to the Mod Wheel Assembly,
location J202. If you are servicing a PC2X, two flat flex cables attach to the Mod Wheel
Assembly, locations J202 and J203.
PC2/PC2X Disassembly/Assembly
Top Enclosure
4-17