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Monday, March 1, 2021

The Imp of the Perverse

Things I think I should be doing, for better or worse.

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Yamaha DX7 – Replacing All Buttons

2021-02-062021-02-06 Laban
In this video I show how I replaced all of the front panel buttons in a Yamaha DX7. The buttons I used was Omron B3W-4050 as I had lots of these on hand from previous projects. These are a bit pricey but they are high quality and also sealed so dust cannot get into them.…
Yamaha DX7buttons, Soldering, Yamaha DX7Leave a comment

Yamaha DX7 – Audio Output Jack Repair

2021-01-082021-01-08 Laban
This Yamaha DX7 had intermittent connection issues with the audio output; if the cable was touched the audio would either drop out or come back. After some troubleshooting I came to the conclusion that the terminals within the jack had been pushed back over the years so they didn’t make proper contact with the cable…
Yamaha DX7Yamaha DX7Leave a comment

Roland SH-101 – Power Switch Replacement

2021-01-022021-01-02 Laban
It is very common that the power switch in the Roland SH-101 becomes bad, which was also the case in my friend’s unit. This can cause various strange issues, the unit powers up as it should but when the button is touched various strange issues can occur. This can be resolved either by opening up…
Roland SH-101Leave a comment

Korg Poly-61 – Battery Leak Repair

2020-12-262020-12-26 Laban
I bought this Korg Poly-61 as “for parts or repair”, it basically did not work at all. From the description of the Ebay listing I suspected that it had a battery leak. These old NiCad batteries can do quite a lot of damage as it eats the copper away in the traces in the board…
Korg Poly-61Leave a comment

Roland TR-505 – Installation of HKA Design ROM Expansion

2020-10-242020-10-24 Laban
In this video I show the installation of a HKA Design Roland TR-505 ROM Expansion. This expansion gives you three extra sets of samples that you can switch between. Apart from the regular TR-505 kit you will have samples from Linn LM-1, LinnDrum and Oberheim DMX. The installation is really simple and the trickiest part…
Roland TR-505Leave a comment

Korg Poly 61 – Installing a Power Socket (IEC C14)

2020-10-112020-10-11 Laban
I this video I show how I replaced the existing permanently mounted power cable on my Korg Poly-61 with an IEC C14 power socket. The reason for this was that the old cable was pretty crusty and also it had a British connector (I’m in Sweden and we use Schuko style connectors). If I were…
Korg Poly-61Leave a comment

Korg Poly-61 – Removing & Attaching Keyboard Keys For Cleaning

2020-09-062020-09-06 Laban
Here I show how to remove the keys from the keyboard of a Korg Poly-61 and how to attach them again. This procedure should be the same for some other Korg synths from the same era, e.g the Polysix. The keys in this one were really dirty, especially on the underside so I washed them…
Korg Poly-61Korg Poly-613 Comments

Korg Poly-61 – Repairing Crushed Joystick

2020-09-052020-09-05 Laban
In this video I show how I repaired the joystick on my Korg Poly-61. It had been crushed during transport and pushed into the chassis so it did not work.
Korg Poly-61joystick, Korg Poly-61Leave a comment

Korg Poly-61 – Fixing Non Working Keys

2020-08-302020-08-30 Laban
This Korg Poly-61 had issues with around 10 of the buttons where they did not generate any notes. The keyboard in the Poly-61 uses membrane buttons which have a rubber dome with a conductive plate which is pushed down on the circuit board. The conductive part tend to go bad over the years so in…
UncategorizedLeave a comment

Korg Poly-61 – Replacing All Buttons

2020-08-132020-08-30 Laban
Replacing all push buttons on the front panel of a Korg Poly-61 as the buttons were very unreliable; some had to be pressed really hard and some of them generated multiple presses). I am using the dust sealed (IP67) Omron B3W-4050 buttons. The strems on these buttons is ever so slightly thicker than the orignal…
Korg Poly-61Korg Poly-61, OmronLeave a comment

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  • Yamaha DX7 – Replacing All Buttons
  • Yamaha DX7 – Audio Output Jack Repair
  • Roland SH-101 – Power Switch Replacement
  • Korg Poly-61 – Battery Leak Repair
  • Roland TR-505 – Installation of HKA Design ROM Expansion

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  • Yamaha DX7 – Replacing All Buttons – The Imp of the Perverse on x0xb0x – Replacing buttons with Omron B3W-4050
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  • Laban on Building the Nava #1 – Soldering the Power Supply
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