# Kurzweil Midiboard (short logic board) v3 Upgrade

**URL:** <https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481>\
**Category:** Synth Repair\
**Tags:** midiboard, kurzweil\
**Created:** [June 7, 2026, 1:57pm UTC](https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481 "2026-06-07T13:57:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Clemens](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/c/df788c/32.png) [@Clemens](https://forums.syntaur.com/u/Clemens)\
**Post date:** [June 7, 2026, 1:57pm UTC](https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481/1 "2026-06-07T13:57:42Z")

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Kurzweil Midiboard – V3 Upgrade

Hello and greetings from Germany!

I have a Kurzweil Midiboard with short logic board. It was upgraded to v3 with a daughterboard. When I boot get error “7 ERR” which means that there is a problem with the non volatile RAM.

I opened the hood and saw that the red and black wire from the daughter board got loose. As far as I understand those two wires a soldered to the legs of the 6116 at position U14. I can see some solder residue but I dont know which cable goes to which leg???

Can anybody please help?

Maybe somebody knows where it goes or owns a short logic board version and can open the unit and send a photo?

Thank you so very much for any help!!!

Best regards

Clemens

 ![IMG_2659](https://forums.syntaur.com/uploads/default/original/2X/3/31659d8d386c70243b70c3aecc8fd0fc4cf69323.jpeg)

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**Author:** ![Austinkeyboards](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/a/6f9a4e/32.png) [@Austinkeyboards](https://forums.syntaur.com/u/Austinkeyboards)\
**Post date:** [June 8, 2026, 6:20am UTC](https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481/2 "2026-06-08T06:20:16Z")

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![canvas](https://forums.syntaur.com/uploads/default/original/2X/5/571ad70bab9ef0ab56c8a0657f995fa956b0935f.png)

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<div class="post-metadata">

**Author:** ![Austinkeyboards](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/a/6f9a4e/32.png) [@Austinkeyboards](https://forums.syntaur.com/u/Austinkeyboards)\
**Post date:** [June 8, 2026, 6:29am UTC](https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481/3 "2026-06-08T06:29:13Z")

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Here is the Data sheet for CDM6116AE2 looks like one of the wires were soldered to pin 4/ address 4. Most of the time the length of the shorter wire when cut could only go to one of the 2 pins of U14. Locate the soldered on the other pin then see which of the wires make it to that pin easily. This is only a guess. Have you looked for the schematics?

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<div class="post-metadata">

**Author:** ![Austinkeyboards](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/a/6f9a4e/32.png) [@Austinkeyboards](https://forums.syntaur.com/u/Austinkeyboards)\
**Post date:** [June 8, 2026, 6:35am UTC](https://forums.syntaur.com/t/kurzweil-midiboard-short-logic-board-v3-upgrade/9481/4 "2026-06-08T06:35:44Z")

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You can purchase the installation guide at this site online. If available it should show where the wires go. Good luck!

> **[Kurzweil Schematics](https://www.musicparts.com/products75b0.html?Company=Kurzweil)**

**Kurzweil Midiboard Keyboard Version 3.0 Installation Manual**  
Contents: (Installation Manual).  
Note: This procedure describes the necessary steps to install the version 3.0 Software upgrade. (Dated 1987) (12pages/$10)