Syntaur Productions
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Products for the Roland
ProMars (MRS-2)
Replacement Keys - Parts
Keyboard Service Center


Replacement Keys
These plastic keys will replace broken ones on your keyboard. There are several different types of keys used on the Roland keyboards, so you will need to make sure you order the correct style (click on the link for your keyboard below). With the exception of the Top C note on the 61-note keyboards, all keys from octave to octave are identical, and all black keys within a given style are identical. In other words, a B note in the lowest octave uses the same key as a B note in any other octave. But the highest C note is different from the other C notes (see illustration below).

If you do not know the note names, on the 61-note keyboard shown below, the white keys from the bottom (left side) up are: C, D, E, F, G, A, B, and then the sequence repeats.

Roland Synth Notes

Click below to view keys for:
ProMars



Parts
We stock both new and used parts; the individual item descriptions will specify whether a part is NEW or USED. All used electronic parts are tested and guaranteed working. This listing reflects our current inventory and is updated daily, so if a part is shown with a "Buy" button, we should have it in stock.

If a part is shown as Out of Stock, then we do not have it, and in most cases, we don't know when or even if we might have it again. Your best bet is to simply check back on our site occasionally. If a part is not listed on our site, then we do not carry that part. We can no longer research or special order parts that are not listed here, and we just don't have time to answer questions about parts that we don't carry.

We want to help you get the parts you need, but please do not ask us to help diagnose problems with your equipment. We simply don't have the resources to do this, and it is just not practical to diagnose repair issues without being able to test the equipment in person.

Pro-Mars (MRS-2)
Battery Battery (Part #4486)
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Roland Bender Lever Bender lever (Part #4023)
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Roland IC Chip IC, 4001 quad gate (Part #3304)
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Integrated Circuit IC, 4011 quad gate (Part #3391)
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Roland IC IC, 4016 quad analog switch (Part #3302)
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Integrated Circuit IC, 4025 3-input NOR gate (Part #2715)
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Integrated Circuit IC, 4049 hex inverter/buffer (Part #2382)
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Integrated Circuit IC, 4051 multiplexer (Part #4319)
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Integrated Circuit IC, 4069 hex inverter (Part #3994)
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Integrated Circuit IC, 4070 quad OR gate (Part #5172)
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Integrated Circuit IC, 4558 dual op amp (Part #3387)
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Integrated Circuit IC, 723 linear regulator (Part #3428)
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Integrated Circuit IC, 741 op amp (Part #3297)
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Roland VCA Chip BA662 IC, BA662 VCA chip (Part #4339)
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Integrated Circuit IC, LM311 comparator (Part #2560)
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Integrated Circuit IC, TL082 op amp (Part #3423)
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Roland Rotary Knob Knob, for VCO (Part #3224)
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Roland Potentiometer Potentiometer, for A/B Tune (Part #3494)
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Roland Potentiometer Potentiometer, 50KB rotary with center tap, for Brilliance, Master Tuning (Part #3613)
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Roland MRS-2 Power Switch Power switch (Part #2227)
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Roland Power Switch Cap Power switch cap (Part #2228)
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Roland Toggle Switch Switch, 3-position toggle, for A/B Tune, Portamento (Part #4484)
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Roland Rotary Switch Switch, 4-position rotary, for Waveform (Part #3592)
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Roland Slider Knob Slider knob (Part #3225)
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Transistor Transistor, 2SC1815 (Part #1943)
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Voltage Regulator Voltage regulator, 7805 (Part #2256)
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Voltage Regulator Voltage regulator, 7815 (Part #2321)
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