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Projecttitel: RE-909Status:
Startdate: 10/2020Duedate: 02/2022Updated:27.April 202123.Feb.2023 - MIDI BUGManufacture link: https://shop.re-303.com/build-it-2/Forum: http://23.235.199.139/~re303c5/forum/forum/11-re-909/ Shop: https://shop.re-303.com Facebook Group: https://www.facebook.com/groups/1657521224406039 |
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RE-909_build_guide_Rev2_sequenzer_EN.pdf
| ID | Issue | AFFECTED Version | Fix | date | fixed version | ||||||
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| 1 | Snare Drum section - | Revision.1 | please download v.1.7 build documentation for details. Service advisory: after building the snare you must place a jumper as shown in the pic below, this is shown without parts placed for clarify
bigger picture from me - easier to find the place..
| 17.Dec.2020 | 1.9 build guide | ||||||
| 2 | C95/c97 Tom section | Rev.1 | swap both against each other | 17 Dec. 2020 | 1.9 buid guide | ||||||
| 3 | Psu | REv.1 | if you‘re using the Safety PSU do not connect pin 27 and pin 28 on the F3 cable, otherwise you‘ll create a ground loop. | 17.dec. 2020 | 1.9 build guide | ||||||
| 4 | PSU - wrong routing → affects the memory | Rev1 | change the 5.6V zener as shown here:
| 17.Dec. 2020 |
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| 5 | Noise floor - crosstalk | REV.1 | from FB RE-909 group: "Hello! Just wanted to share some good news about noise and crosstalk issues on RE-909. Pictured below is a Roland TR-909 factory mod with a wire that seems to reinforce grounding between C151 styrofoam cap in the hihat low pass filter and the common analog ground track where R236 is also attached. By doing the same mod in RE-909, pictured below also in the bottom of the board, cymbals crosstalk and digital noise leak into the hihats channel is eliminated, which fixes the last remaining issue in my build. I used a thick grounding wire to connect the lower pin of C151 to the double hole in the common ground track next to R236. This fix works perfectly on traffo PSU but I can’t guarantee it works on safe PSU (and preliminary tests show it doesn’t) because of the difference in ground routing. Otherwise, enjoy your digital noise-free, crosstalk-free RE-909!"
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| 6 | Gate | rev1-2 | in case you hear the Gate signal of the SD in BD - you can try to connect a 1uF polar cap** between GND and Trigger. Measure with an scope to find the best value - maybe 470/680/820nF is fine too - or less. | 15.may 2022 | was posted in the RE-909 FB group omg 10. may 2022 not tested by me, but confirmed by other people | ||||||
| 7 | MIDI BUG | rev.2 |
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Tips:
| ID | Focus | Info |
|---|---|---|
| 1 | Wiring | You can use the MTA100 system from TE connectivity for example - |
| 2 | noisy/hiss | make sure to solder the potentiometer at all pins to have the correct ground - (the ground flow thru the outside pins / it act like a trace/bridge) |
| 3 | MIDI OUT | measure the transistor HFE value for the switchboard Q604 - a gain of 350 should be fine. otherwise it can happen that MIDI OUT doesn't work. you can also mod the MIDI Out : http://www.colinfraser.com/tr909/909mods/909midi.htm |
| 4 | Transistors | select the * S* Transistors to the same HFE to get a balanced gain on all voices. check the schematics for more details: q12 in Bassdrum q51 in snaredrum q20 in Low Tom q27 in Mid Tom q58 in High Tom Q71 in Crash Q85 in HH Q65 in Rimshot Q37 in Handclap Q33 Tom Noise - should be ignored or just use the same hfe as above |
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