MATRIXSYNTH: Oberheim Matrix 12 - MIJ **Fully restored**

Tuesday, May 07, 2019

Oberheim Matrix 12 - MIJ **Fully restored**


via this auction

"Oberheim Matrix-12 (Made in Japan)... repaired and restored.

The Matrix-12 is perfectly stable when turned on since the electronic part of the repair job is complete ( approx. 6 weeks ), the PSU DC output voltages are as good as they can get ( +5.12v for +5v/-5.02v for -5v/ 11.9v for 12v/-11.9 for -12v/ +49.83 for +50v)

110/220v switch at the input ( currently set at 220v ofc ;) )
MIDI tested under Ableton Live, Xplorer and as a master keyboard.
Input for functional expression pedal tested.
Aftertouch is working great, and the 12 individual outputs work as they should
OS version: CPU: 1.1
Voices: 1.4

Work done on it:

PSU Board:

-The connectors solders have all been reflowed
-Replacement of electrolytic capacitors on the power supply (16) (Nichicon 105 ° C)
-Replacement of resistors (1w and more)
-Replacement of components To-220 (regulators + 12 / -12 and -5, transistors, diodes) new mica insulators

Voiceboards:

-Replacement of 4 defective CEM3374
-Replacement of electrolytic capacitors (144): Nichicon 105 ° C
-The connectors solders have all been reflowed


Display Board:

-New ICs LB1290 ( display driver) w/ support (2)
-New Noritake FG405B2 VFD screen and jumpers to repair damaged tracks
-Replacement of electrolytic capacitors (2): Nichicon 105 ° C
- Disassembly / cleaning of ALPS potentiometer and encoders.
-51 new Marquardt 6425.1101 switches + new adapted caps

CPU Board:

-New battery CR123A on support
-Installation and adaptation of 9 new Marquardt 6425.1101 switches
-Replacement of electrolytic capacitors (8): Nichicon 105 ° C
-The connectors solders have all been reflowed

Others:

-Fans have been changed by new ones : more efficient and less noisy
-Copy of EPROMs is available ( .bin )
-Bank of KidNepro loaded + preset customs (single / multi)
-New 1mm screen protectors (custom made - acrylic )
-New Wooden flanks by Synths&Wood (UK)
-New jack nuts (individual outputs)
-New M4 screws / bolts (A4 quality) for wooden flanks
-External cleaning
-Keybed, keys and keys contacts have been cleaned
-Brand new flycase

The Matrix-12 can be seen in Paris, FR"

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