other public infos
on the public pages from me are also some Infos available:
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Updated: 19.dec.2019 Patrick.J aka DSL-man
updated: 10.March 2020
DO NOT SHARE THIS INFOS in public domain - its copyrighted (by Matthias and me), thank you.
| ID | MatthiasIssueNr. | Issue release date | Issue | Solution |
|---|---|---|---|---|
| 1 | 29 | 19.dec.2019 | When mounting the matrix to the lower frontpanel by the ground terminals, a distance of 1 - 1.5 mm can be noticed between the matrix's surface and the frontpanel. | File down the narrow part of the bushing to at least 3 mm or less. Plan B: try a washer or 2 of them (not tested yet)  |
| 2 | 28 | 16.dec.2019 | At the Z board there is a link missing on the 12 V trace. The failure affects OSC 1. |
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| 3 | 27 | 16.dec2019 | At the Z board the captions of the presets are not printed. | See herefor the attached page of the population guide. |
| 4 | 26 | 08.dec2019 | "I meanwhile realized the EK construction manual gives no detailled information about mounting the matrix to the lower panel. So I decided to extend the manual by an additional page. Find this new page attached to this Newsletter. With this change, the actual EK construction manual now is rev. 1.24 and will be part of the next shipments (serial 078, 101, 106)." | |
| 5 | 25 | 04.dec.2019 | There is no trace error at the X board. It is at the Y board - I am sorry. As reported, it was already soldered by Derek before packing the Electronics-Kit. | Therefor see the attached photo. If this link is not present, solder a piece of wire to complete the trace.
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| 6 | 24 | 03.dec.2019 | There is a track error at the -9 V rail. See the attached backplane photo. | Solution: Solder a cable as shown in the picture (yellow link) to connect the right part of the -9 V rail.
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| 7 | 22 | 03.dec | Info only: Please refer to page 2 of the Population-Guide Version 1.92 | |
| 8 | -- | 23.dec | Info: the 1K 2Watt resistor for the X board is for the PSU wiring... not on the X board pcb use 1% metal film resistors or select the 2% resistors on board X. | |
| 9 | Issue 30 | 27.dec | R 12 (PSU / earth link) The wiring diagrams were not correct since an update earlier. This causes a parasitic voltage and in some cases obviously a strange behaviour | Solution: So the next shipments will include construction manual rev. 1.26 or even a higher revision. File: |
| 10 | -- | 29.dec | howto for X card remove the Pin 4 and 8 (the connector for the 2 TIp3055) |
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11 | use a 7mm drill that the flat screws fits flat on bottom of the PSU base plate, only as seen on the picture on right side. wide also the fuse holders with a 4mm drill that the delivered screws from the kit will fit thru the fuse holders. |
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| 12 | 31 | Problem: | Solution: | |
| 13 | Patrick Issue | Problem: the regulators are too hot - we waste too much energy in heat | the 18V AC transformer is wrong here - we have a 27V DC output after the bridge rectifier, beer we only need 15V DC. so I tried a 12V AC transformer which gives you a 18V DC output which is much better, the heatsinks are only at 22-30 degrees instead of 50C or higher. TME PART number: TS20/023 please note: you have to drill 3 holes in the PSU back plate to mount this. | |
| 14 | Patricks | Problem: Envelope bleeds in VCOs | the Lamp is the root cause. it can be replaced by a LED (preferred yellow) you also Need a 6V8 zener (6.8V zener Diode and cable tube/shrink) it was tested by me and works fine. TME Led holder with included LED: 2658.8073 (mentor vendor part nr.) 6v8 zener diode: BZX55C6V8-TAP
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my own build tips, here are some pictures of my 5 builds:
lower panel:
Upper panel, mostly shielded cable:
