This page documents my experience with a Japan-imported Roland VP-550 synthesizer, including insights into its power supply and compatibility with European voltage standards. I hope this helps fellow synth enthusiasts who are curious about using Japanese gear abroad.
Roland VP-550 Japan 100V
After purchasing a Roland VP-550 synthesizer in Japan—where the unit
is labeled for 100V 50/60Hz operation—I initially used a step-down
transformer to match the voltage. However, curiosity led me to
inspect the internal power supply. The VP-550 features a standard
IEC power inlet, often associated with multi-voltage compatibility.
Upon opening the unit, I discovered the internal PSU is a Sharp
B184, clearly rated for 100–240V input. I cannot confirm whether the
power supply in my Roland VP-550 is the original factory-installed
unit or if it was replaced at some point. After thorough testing
with dummy loads at 230V, the supply performed reliably and within
spec.
I now run the VP-550 directly on 230V mains without issue,
confirming that despite its labeling, my unit is globally
compatible thanks to its robust internal design.
Sharp B184 label showing 100–240V compatibility.
- Always verify the internal PSU specifications before plugging into higher voltage mains.
- Consult a qualified technician if you're unsure.
*** Disclaimer ***
I cannot confirm whether the power supply in my Roland VP-550 is the
original factory-installed unit or if it was replaced at some point.
The internal PSU in my unit is a Sharp B184, rated for 100–240V, and
it has functioned reliably at 230V in my tests. However, I take no
responsibility for any damage, injury, or malfunction resulting from
others opening their synthesizer, inspecting the power supply, or
choosing to operate it at voltages outside the labeled 100V
specification. Proceed entirely at your own risk.
Bottom view of the VP-550 with PSU location
The Sharp B184 switching power supply. (Roland partno A1DU2L3B184)