Roland ProMars MRS-2 -1979    Weight=? Lbs. Number Manufactured = ? MRP = $1995

User Manual:
Reset Proceedures: N/A
Operating System code: N/A
MIDI or other control protocol: N/A
Software related Links: N/A
Patches or knob settings:
Circuit Overview: below
Scematics/Service Manual: Manual Manor
Common Service Issues/Tips: below
Parts Sources: Keys knobs semiconductors misc
Uncommon chips/modules used:
Modifications:MIDI in jack
General Info Links: Vintage Synth Explorer

Circuit Overview:
     A monophonic reworking of the Jupiter 4 basically with some added goodies.

Service Tips:
     Anyone? Lots of similarities to JP4 obviously so cleaning issues on key switches (carefully scaling with an appropriate dental pic, etc. is often one way to remove tough residues).

Roland still stocks many parts for older instruments! You can always order them through your local Service Center and see what happens! Otherwise I have some parts also so don't hesitate to ask.
Contact Sound Doctorin'