Project
Projecttitel: RE-909
Status: FINISHED
Startdate: 10/2020
Duedate: 02/2022
Updated: 27.April 2021
Manufacture 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
Its an replica - not just another clone
Schematics and Service Notes:
Roland-tr-909-service-notes.pdf
BOM: (last upload 08/2021)
RE_909_BOM-BUILDGUIDE_v1.15.xlsx
changelog:
| v.1.0 | release | |
| v.1.1 | added IC11 and D30, D31, D33 to ORDERING | |
| v.1.2 | added info from christian about cabling | |
| v.1.3 | added gnd build notes from Christian, fixed an amount value | |
| v.1.4 | changed electrolytic capacitor in safety psu from 25V to 35V. | because its standard to have at AC Rectifier a safety range of multiplier 1.5 - 2 (for example an 18VAC is able to give after the rectifier a 28V-29V DC voltage. regards Patrick |
| v.1.5 | added extra alternative options for 10k trimmers (clap) | |
| v.1.6 | fixed value in tape section. | new value R311: 820K (old value was 820R) |
| " Amp section " | fixed C143 voltage 47uF to 50V. 35V is fine too (comment Patrick) | |
| v.1.7 | advisory added for snare drum fix. | |
| v.1.8 | added info about cabling and errors in TR-909 service docs | |
| v.1.9 | fixed values in high tom, C95 and C97 were reversed | new value C95: 100nF new value C97: 15nF (just swap both capacitors, old value was C95 15nF & C97 was 100nF) |
Build Guide
https://shop.re-303.com/build-it-2/
Christians Illustrated build guide part 1 ENGLISH
Christians Illustrated build guide part 2 ENGLISH
Christians Illustrated build guide part 3 ENGLISH
Christians Illustrated build guide RE-909_parts_orientation_and_tips_ENGLISH
Christians Illustrated build guide part 1 GERMAN
Christians Illustrated build guide part 2 GERMAN
Christians Illustrated build guide part 3 GERMAN
Christians Illustrated build guide RE-909_parts_orientation_and_tips_GERMAN
RE-909 case assembly guide (DE).pdf
RE-909 case assembly guide (EN).pdf
Installing the 909 Cartridge Reader.pdf
RE-909 REV2 pcb
How_to_build_the_RE-909_Safety_PSU_(DE).pdf
How_to_build_the_RE-909_Safety_PSU_(EN).pdf
A_summary_of_the_changes_to_the_RE-909_PCBs_(DE).pdf
A_summary_of_the_changes_to_the_RE-909_PCBs_(EN).pdf
RE-909_build_guide_Rev2_sequenzer_DE.pdf
RE-909_build_guide_Rev2_sequenzer_EN.pdf
| ID | Issue | Fix | date | fixed version |
|---|---|---|---|---|
| 1 | Snare Drum section - | 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 | swap both against each other | 17 Dec. 2020 | 1.9 buid guide |
| 3 | Psu | 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 | change the 5.6V zener as shown here:
| 17.Dec. 2020 |
|
| 5 | Noise floor - crosstalk | 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!"
| ||
| 6 | Gate | 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 |
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 |