Roland MC-303
- For more information, see this article's corresponding Wikipedia page: [1].
| This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables | 
|
| This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables | 
|
Roland MC-303
| Preliminary Information | |
|---|---|
| Release Year | 1996 |
| Leak Risk | Low |
| Batteries | CR2032 (User storage) |
| Mounting Technology | Through Hole, SMD |
| Capacitor Types | Aluminum Electrolytic, Ceramic |
| Destructive Entry | No |
| Power Requirements | |
| Input Voltage | 9V DC |
| Current (Amps) | 1,200mA PSU |
| Power Connector | Barrel Jack 5.5mm x 2.1mm Negative Center |
| Power Pinout | |
 |
|
The Roland MC-303 is a music composition device designed more for live performances than studio use. It uses a mix of digital buttons, a rotatory encoder, and analog potentiometers for the interface.
Known Issues
Damaged Potentiometers
Causes
- The volume and control potentiometers are commonly damaged and can become internally loose
-
A damaged volume potentiometer that bends out of line from the others.
-
Metal fingers meant to hold the potentiometer together are bent from side impact to the shaft.
Solutions
- You may get lucky and be able to bend the fingers back or possibly glue the case back together on the potentiometer.
- Replace bad potentiometers
Disassembly Notes
Be careful of the ribbon cables when removing PCBs. These use a crimping style connector that clamps down onto the individual wires that stick out of the end of the ribbon cable. It can be easy to tear or bend these.
Original Parts
Roland MC-303 PANEL BOARD
ASSY 70788723
| RefDes | Qty | Resistance | Gangs/Wipes | Mount | Markings | Brand | Part Number |
|---|---|---|---|---|---|---|---|
| VR1 | 1 | 10k? | 2 | Through Hole | 103B, 7, AV | ? | ? |
Replacement Parts
Roland MC-303 PANEL BOARD
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| VR1* | 1 | P0925N-FC15AR10K | Mouser,Digikey |
*Not yet tested