Roland MC-505

From Roland's Groovebox line of products(Related: Roland MC-303), the MC-505 is a music sequencer with integrated ROMpler for sound creation.

Causes

 * A big whack

Solutions

 * Replace potentiometer, hopefully find knob

Causes

 * Rushed reassembly
 * Depressed in too far

Solutions

 * Open device, remove button panel, re-apply double sided tape to secure buttons and replace them, reassemble

Disassembly Notes
Be sure to remove knobs, slider caps, rotary wheel, and nut under rotary wheel when removing top panel

Clear faceplate over LCD is double sided taped on top and bottom. Use a thin guitar pick to break glue loose from inside and then work it slowly from the front once raised. Warning: the tinted covers over 7 segment displays can be scratched

Original Parts
Original potentiometer's datasheet: https://tech.alpsalpine.com/assets/products/catalog/rk09l.en.pdf

Replacement Parts
While these potentiometers have long enough shafts, the flatted areas are longer than the original model, so a spacer might need to be used.

WARNING - THESE POTS ARE SLIGHTLY TOO SHORT, FIND 20MM SHAFT LENGTH SUBSTITUTES If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.