MIDI Retrofit & Decoder Kits, DIY Electronics—Worldwide Delivery
MSA-R: Assembly Notes (Revision A Boards)
If your circuit board appears different than the board pictured below, please see the current revision assembly notes.Important Information
- Mount components correctly. This kit contains an electrolytic capacitor, part C5, which could explode during operation if installed backwards. The voltage regulator, part IC3, can become extremely hot if installed backwards.
- Do not exceed the specified electrical limits of the device. Placing too great a load on the MSA's outputs or exceeding the specified supply voltage can cause excessive heating and could damage the device. Attempting to control currents or voltages larger than the specified maximums could result in personal injury or damage the MSA and connected devices.
- Do not apply external voltages to the MSA's 5V output or MIDI THRU ports. This will cause excessive heating and will damage the MSA.
- This kit contains some ESD-sensitive parts. Please take reasonable static-control precautions when assembling the kit.
PCB Layout
The location of each part is clearly marked on the MSA circuit board.
MIDI Wiring
Wire pins 4 & 5 of the MIDI connector to the corresponding terminals of the MIDI In port. If installing a MIDI Thru connector, wire pins 2, 4, and 5 to the corresponding terminal of either MIDI Thru port.
To chain multiple MSA units together, MIDI connectors are not required—wire terminals 4 & 5 of either MIDI Thru port directly to the corresponding MIDI In terminals on the next MSA unit in the chain.
Parts List
All components are mounted on the side of the board with the white legend. Components can be mounted in any order, but it is easier to mount the smallest components first.
*Appearance of parts may vary.
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| Part | Image* | Notes |
|---|---|---|
| C1-C4 |  | None. |
| C5 |  | Positive end of capacitor has an indentation, and negative end is marked with arrow. Positive end must match the "+" symbol on the circuit board legend. |
| D1 |  | Dark band on diode must match the white band on the circuit board legend. |
| D2 |  | White band on diode must match the white band on the circuit board legend. |
| IC1 |  | Mount socket on circuit board first, then insert IC into socket. Notched end must match notch in the circuit board legend. |
| IC2 |  | Mount socket on circuit board first, then insert IC into socket. End marked with dot must match notch in the circuit board legend. |
| IC3 |  | Pin 1 is on the left in the photo. Pin 1 must match dot on the circuit board legend. Before mounting permanently, bend the leads so that the IC "leans" into the open space on the circuit board. |
| IC4 |  | Mount socket on circuit board first, then insert IC into socket. Notched end must match notch in the circuit board legend. |
| K0-K7 |  | Pin 1 is marked with an angled edge on the top of case or a notch on the label side of case. Relay must be inserted so that pin 1 matches the marked end of the circuit board legend. |
| LED1 |  | The short lead must match the flat side on the circuit board legend. |
| R0-R7 |  | Strip the insulation from the included jumper wire. Cut the wire into pieces and mount them in place of an actual resistor. |
| R8 |  | 1/4 watt, 10kΩ resistor, marked with the following color bands: brown, black, orange, gold. |
| R9-R13 |  | 1/4 watt, 220Ω resistor, marked with the following color bands: red, red, brown, gold. |
| R14 |  | 1/8 watt, 1kΩ resistor, marked with the following color bands: brown, black, red, gold. Mount resistor vertically (on end). |
| RN1 |  | Pin 1 (marked with a dot) must be inserted in the small box on the circuit board legend. |
| SW1 |  | Mount the DIP switch so that the "off" position is nearest to the edge of the circuit board. |