It is a full-blown replacement for old 475+515 boards. In this way a new 509A control board was created. Later KLM-515 and KLM-475 were fitted together. This was the first control board version. KLM-475 with small auxiliary board KLM-515 (early Poly-61 version) Korg Poly-61 uses three different control board versions: Hard-to-find IC37 (reset IC MB3761) was replaced with a modern equivalent. If your MCU is faulty or is missing, a replacement MCU is available. The cloned board can be easily repaired and calibrated in the future using original Poly-61 service manual. The schematic of the circuit is as original one. The parts are located on the same place and the board uses the same types of parts. It is almost an identical copy of original 509A board. It is necessary to restore all affected traces, mounting holes, vias and to find not working parts (especially ICs).Īnother solution is to use a cloned 509A, that’s why the name cKLM-509A. It is a very hard job to repair a PCB affected by battery corrosion. Generates pulse waveforms with its DCOs. Provides Control Voltages for synthesizer blocks as DCO waveshaper, VCF, VCA.Here is a list of some important 509A board’s tasks: Corroded metal can’t conduct anymore, so part of control board fails and it is not possible to program and play sounds. Metal parts are covered with white oxides and blue-green salts. Battery leak of an original NiCd battery in Korg Poly-61 synthesizer on control board KLM-509A/475 (shortly 509A/475) causes corrosion of vias, parts’ mounting holes, electric traces and electronic components (caps, ICs, transistors etc.).
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |