Repairing a Siel DK 80 Synthesizer Weird Power Issue

Today I've got a Siel DK80 with an issue. Both 7-segment displays are very dim, and also the front panel LEDs are faint. Seems like a power supply problem. What I noticed is when I depress the power button fully to turn it off, the display and leds come back to full brightness. Seems that the power switch might be going out. Let's teardown the synth and replace the switch to see if it fixes the issue.

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Roland RS-09 Synthesizer Repair

Today I am going to service a Roland RS-09 having some issues. I'm going to
- address the tactile button actuator assembly
- troubleshooting the dead button panel circuit
- address some metal panel rust
- replace some felt dust filters for fader pots
- deal with the rickety plastic rivet fasteners for the front panel.
Lots of fun stuff.

0:00 Introduction and Symptoms
0:57 Teardown
2:40 Dead Button Diagnosis
4:31 Tests
5:12 Button Actuator Assembly
6:23 New Felt Dust Filters for Slide Pots
7:33 Rivets, Chassis Rust, Final Test

Be sure to check out my cool eurorack modules for sale in my Reverb Store