# \#dead-key

**URL:** https://forums.syntaur.com/tag/dead-key/3050.md

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## [Roland RD-800 - Repair Diagnostics questions](https://forums.syntaur.com/t/roland-rd-800-repair-diagnostics-questions/9433)

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**Author:** [@Sir\_Jeff](https://forums.syntaur.com/u/Sir_Jeff)\
**Replies:** 4\
**Last updated:** [July 27, 2026, 11:51pm UTC](https://forums.syntaur.com/t/roland-rd-800-repair-diagnostics-questions/9433 "2026-07-27T23:51:43Z")

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I recently purchased a used Roland RD-800. Upon delivery, I ran the keyboard through some cursory operations and was happy with the sound and operation. After a few hours experimenting with settings, I found several of t…

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## [Akai AX80, every 8th voice dead](https://forums.syntaur.com/t/akai-ax80-every-8th-voice-dead/9402)

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**Author:** [@artogsta](https://forums.syntaur.com/u/artogsta)\
**Replies:** 10\
**Last updated:** [May 13, 2026, 3:13pm UTC](https://forums.syntaur.com/t/akai-ax80-every-8th-voice-dead/9402 "2026-05-13T15:13:33Z")

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Akai AX80 – Every 8th voice dead I have a problem with every 8th voice being dead on my Akai AX80. It varies what voices are dead. All the keys work. If I hold down one of the dead voices the rest of the keyboard is wo…

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## [Rhodes MK-80 Keybed Zener Diode Replacement - Diode 4.7B or 7.5Z?](https://forums.syntaur.com/t/rhodes-mk-80-keybed-zener-diode-replacement-diode-4-7b-or-7-5z/9370)

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**Author:** [@JEC](https://forums.syntaur.com/u/JEC)\
**Replies:** 3\
**Last updated:** [April 27, 2026, 6:15pm UTC](https://forums.syntaur.com/t/rhodes-mk-80-keybed-zener-diode-replacement-diode-4-7b-or-7-5z/9370 "2026-04-27T18:15:40Z")

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\[Rhodes\] \[MK-80\] – \[Which Zener Diode for Keybed?\] Hi, I need to replace some Zener Diodes on a Rhodes MK-80 Keybed. The service manual lists two Zener Diode part numbers but does not specify if the Keybed Diodes are… Z…

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## [Moog messenger ‘0’ tune](https://forums.syntaur.com/t/moog-messenger-0-tune/9410)

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**Author:** [@eenfield](https://forums.syntaur.com/u/eenfield)\
**Replies:** 0\
**Last updated:** [April 18, 2026, 3:37am UTC](https://forums.syntaur.com/t/moog-messenger-0-tune/9410 "2026-04-18T03:37:19Z")

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MOOG MESSENGER ‘0’ TUNE Does anyone have service info for adjusting pitch to match ‘0’ on the OSC 1 & 2 Tune Knobs. I have returned 3 new Messengers, and the latest replacement is mis-calibrated also! The NuMusic Forum …

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## [Roland HP 2900G No Sound](https://forums.syntaur.com/t/roland-hp-2900g-no-sound/9315)

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**Author:** [@Marc1](https://forums.syntaur.com/u/Marc1)\
**Replies:** 0\
**Last updated:** [January 20, 2026, 6:13pm UTC](https://forums.syntaur.com/t/roland-hp-2900g-no-sound/9315 "2026-01-20T18:13:00Z")

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Hi, That's my electric piano. It worked fine for a long time, although it did occasionally make an extra noise, especially during startup. It also made noises when I adjusted the volume knob. It was like there was some k…

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## [Alesis Ion Key Problem](https://forums.syntaur.com/t/alesis-ion-key-problem/9198)

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**Author:** [@lukepigott](https://forums.syntaur.com/u/lukepigott)\
**Replies:** 3\
**Last updated:** [January 2, 2026, 8:03pm UTC](https://forums.syntaur.com/t/alesis-ion-key-problem/9198 "2026-01-02T20:03:59Z")

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hello! I recently bought an old Alesis Ion that had some issues. Since buying, I have upgraded the OS, cleaned the synth inside and out, and cleaned key contacts of four dead keys (the top four keys of the keybed). The…