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Roland JD-800 Repair, Restoration & Modification

The Roland JD-800 is a virtual analog synthesizer produced from 1991 to 1996. Like the D-50, it uses Linear Arithmetic synthesis, which combines samples with digital synthesis. There are 108 built-in waveforms, with the ability to expand this with cards. This is a JD-800 I acquired that was in sad shape - it was suffering greatly from the "red glue of death" - a common problem with Roland synths of the time. This epoxy failure causes sticky, red glue to drip out of the keys and into the synthesizer, gluing keys in place and destroying circuit boards. In this video, I show how I take the synth apart, fix the red glue mess, then do some modifications to the aftertouch and power supply. Parts: Silicone Buffer Hose: https://amzn.to/3zVVNGf Silicone Lubricant Spray: https://amzn.to/3n68IxG IEC Socket: https://amzn.to/3DYBKad Dust-Off: https://amzn.to/3tVQbIb Sodium Hydroxide: https://amzn.to/3xCJoEc Replacement Felt: https://amzn.to/3Ofr4Io Totally Awesome Cleaner: https://amzn.to/3OmY5SO Lithium Grease: https://amzn.to/3tVpinT Brake Cleaner Solvent: https://amzn.to/3NekW1I Plasti-Dip: https://amzn.to/3n6xH3N Tools: Anhydrous Isopropyl Alcohol: https://amzn.to/3FYcfag Pro Honda Spray Cleaner: https://amzn.to/3YN7Ak5 3M Spray Adhesive: https://amzn.to/3mg87wF Vessel JIS Screwdrivers: https://amzn.to/3hN1RKE Desoldering Pump: https://amzn.to/40bh8Vu Soldering Station: https://amzn.to/3ofPgCz DeOxit D5 Contact Cleaner: https://amzn.to/3mIihpT DeOxit F5 Fader Cleaner: https://amzn.to/3KGZ8Nj Rigol DS1054Z Oscilloscope: https://amzn.to/3VghKIw Thermal (infrared) camera: https://amzn.to/3XbEIRk Microphone Amazon: Rode PodMic https://amzn.to/3oxx4kT Microphone Thomann: Rode PodMic https://www.thomann.de/gb/rode_podmic... Microphone Boom Amazon: Rode PSA-1 https://amzn.to/3LlMum3 Microphone Boom Thomann: Rode PSA-1 https://www.thomann.de/gb/rode_psa1.h... 0:00 Introduction/Overview 1:59 Red Glue of Death 2:50 Initial Disassembly 4:14 Keybed Glue 5:21 Keybed Locking Strips 6:39 Removing Keys 9:24 Removing Rubber Actuators 10:14 Failed Buffers 10:35 Removing Glue From Keys 13:02 Epoxying Weights Into Keys 15:49 Removing & Replacing Buffers 17:43 Cleaning Key Contacts 18:30 Replacing Rubber Actuators 19:57 Reinstalling Key Springs 21:44 Replacing Keys - Problem! 22:36 Buffer Fix 23:42 Replacing Keys & Reassembling Keybed 24:38 Replacing Felt 25:24 Removing Glue From Case 26:00 Removing Circuit Boards 29:03 Cleaning Sliders 31:08 Replacing Switches 33:40 Reinstalling Circuit Boards 34:21 Power Supply Modification 38:09 Aftertouch Modification 38:33 DAC Linearity Check 38:59 Battery Replacement 39:12 Final Reassembly 39:59 Sounds of the JD-800 #Roland #JD800 #Restoration