Casio SK-1 Installation
SKM Version 2: SK-1 Installation Instructions
Step 1: Assemble the SKM circuit board.
See the illustrated assembly notes. Set position #5 on the DIP switch to "OFF".
Step 2: Attach the hook-up wires.
Attach a 15" length of wire to each of the following pads on the SKM circuit board:
Step 3: Disconnect power from the SK-1.
Disconnect any external power cords and remove any batteries from the SK-1. After disconnection, move the SK-1 "function" switch to the "play" position to drain any stored charges.
Step 4: Remove the internal speaker from the SK-1.
Open the SK-1's case and remove the speaker. Set aside the speaker mounting hardware for re-use.
Step 5: Mount the MIDI jack on the SK-1.
The MIDI jack requires one 5/8" hole and two 3/32" holes as shown. Be careful not to damage the SK-1's internal parts when creating the holes. Use two of the speaker mounting screws to secure the jack.
Step 6: Mount the SKM circuit board.
Use the speaker mounting hardware to secure the SKM circuit board. Tighten the screws just enough to secure the SKM circuit board.
Step 7: Connect the MIDI jack to the SKM.
Note the numbering of pins on the MIDI jack.
Connect pin 4 on the MIDI jack to the pad marked "M4" on the SKM circuit board. Connect pin 5 on the MIDI jack to the pad marked "M5" on the SKM circuit board.
Step 8: Connect the SKM power lines to the SK-1.
Connect the "GND" and "+5V" pads on the SKM circuit board to the SK-1 main board as shown.
Step 9: Connect the SKM keyboard control lines to the SK-1.
Locate the 12-conductor ribbon cable that connects the SK-1 keys to the SK-1 main board. The conductors are numbered 1 to 12. Connect each of the "TO KEYBOARD" pads on the SKM circuit board to the corresponding conductor of the ribbon cable.
In this example, the wires are routed underneath the SK-1 main board to meet with the ribbon cable.
Step 10: Connect the SKM "AUX SCAN" control lines to the SK-1.
Locate the 20-conductor ribbon cable that connects the SK-1 buttons to the SK-1 main board. The conductors are numbered 1 to 20. Connect each of the "AUX SCAN" pads on the SKM circuit board to the following conductors of the ribbon cable:
[SKM "AUX SCAN"] - [SK-1 20-Pin Ribbon]
1 - 12
2 - 13
3 - Not Connected
4 - 20
5 - 14
6 - 16
Connect your SK-1 to the "MIDI OUT" port on any MIDI sequencer or MIDI controller.
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