Customer had original DX-7, presented with a nasty pop and burning smell, and a ‘dodgy’ output jack.
This keyboard was made for servicing, a few screws and the lid hinges up. Lovely. Then the cause of the stink was obvious, infamous RIFA suppression cap gone south:
Also noticed memory backup battery (soldered to board) which by now was dead:
Output jack falling to pieces:
Arc suppression cap replaced:
New jack obtained and fitted:
Memory corruption evident (and weird sounds!):
Battery holder fitted (to aid future replacement) and new CR2032 supplied:
Reloaded the internal memory patches from the external cartridge, and tested memory voltage reading:
Sliders very scratchy so board extricated and Deoxit F5 applied:
All sounded very good (played a bit for 80’s nostalgia), given an external clean up and touch up of paint at various places and back with the customer.