ChinMuzik Posted October 22, 2016 Report Share Posted October 22, 2016 (edited) I just completed the construction for the CS of my MB-6582 build. I succesfully installed MIOS and the LCD is working as it should. After installing the current limiting resistors...when powering on the unit..I get a strange pattern on the matrix. Column 6 of the matrix flashes steady and no matter what I do it won't stop. Also, a couple of the controls LED's pulse very dimly in the same pattern as the matrix column. Several buttons do not work. There is also no response from any of the encoders. And another strange thing, the LCD will freeze and time a "poly" patch is selected. EDIT: I noticed the LCD freezes only when browsing patches while the matrix is in MATRIX mode...if in METER mode it browses fine. I checked soldering and no bridges and no visible shorts. I reaseated the shift registers and checked 5v supply on all sockets which is good. Cleaned all residue on the bottom of the board. After reseating, now some buttons behave strangely (along with ones that didn't work before) Edited October 22, 2016 by ChinMuzik Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 27, 2016 Report Share Posted October 27, 2016 Hi, May be you need to recheck the soldering again, not for bridges only. The Led's and buttons are controlled by shift registers. To check all the ic's for right direction installed, for no broken ic pins and for it are in the sockets in right places. Regards, Janis 1 Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted October 29, 2016 Author Report Share Posted October 29, 2016 I've checked all shift registers and swapped them with new ones. Checked orientation twice. Reflowed each socket and checked continuity on each socket pin. ibthen checked continuity on each pin on the cables connecting the base and CS which was fine. Also, the resistor networks have proper orientation...however I did not populate this board sobI do not know if these are the type that have common pin 1. How would I discern? I'm still getting nothing from the encoders and some buttons do not work...SId 2 and 4 work but not SID button 1 and 3.. Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 29, 2016 Report Share Posted October 29, 2016 Hi, The resistor networks are possible simply measure with the multimeter. If it not proper pinout , you are able to solder ones very fast from the separate resistors. Regards, Janis 1 Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted October 29, 2016 Author Report Share Posted October 29, 2016 So they are the proper resistor networks. and the orientation is good. I am really at a loss now. i went over the cs and base board traces to see anything broken but all looks fine. Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 30, 2016 Report Share Posted October 30, 2016 Hi, Here is a default encoder assignments for MB6582: http://www.midibox.org/dokuwiki/doku.php?id=default_encoder_assignments On the shift registers appropriate pins you can check pulses, when you slowly turn encoders knob. ps. some encoders have a different pinout, if yours are from another manufacturer. "Patience is a virtue" Regards, Janis Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted October 30, 2016 Author Report Share Posted October 30, 2016 Ok I am an idiot.... I never installed the pin headers for J09 which supplies the 5v for the encoders. Now they all work fine. But I am still clueless as to what is making the buttons and LED matrix behave so badly. Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 30, 2016 Report Share Posted October 30, 2016 May be you can check all signal diodes 1N4148 are right polarity oriented . Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted October 30, 2016 Author Report Share Posted October 30, 2016 All the diodes polarity are correct. The LCD no longer freezes when selecting patches. Not sure what resolved that issue. The buttons for Filter, CC, Sync, SID 1 and SID 3 do not work. Is there a way to test tactile switches with a meter? Even though I highly doubt 5 switches would be bad. Quote Link to comment Share on other sites More sharing options...
Janis1279 Posted October 30, 2016 Report Share Posted October 30, 2016 (edited) Hi, as you see it's some info from Wibas mb6582 building files. At first you can print it for the better understanding for the matrix structure, I think. http://wiki.midibox.org/lib/exe/fetch.php?media=mb-6582:mb-6582_cs_dout_wiring.pdf http://wiki.midibox.org/lib/exe/fetch.php?media=mb-6582:mb-6582_cs_din_wiring.pdf When I built my MB sid custom CS, it helps a lot. Regards, Janis Edited October 30, 2016 by Janis1279 1 Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted November 12, 2016 Author Report Share Posted November 12, 2016 I'm almost at the point of giving up lol. One more ?...if it was a ground loop would it cause the LED matrix to light up strangely like such? Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted November 13, 2016 Report Share Posted November 13, 2016 Hi, most likely, it is a connection problem, as the full 6th matrix column lights up - check out the wiring of the 6th column and trace it, Janis linked the schems above, if i interpreted it right it should go to JD8 - D6. I'd expect the other LEDs to flash with the matrix are also connected to JD8-D6, e.g. the filter LEDs. Right? It may be the JD8-D6 wire connecting baseboard and control surface, or something on the baseboard - manually trace back JD8-D6 on the baseboard to the shift register and see if you have any shorts or bad soldering in between... You will find the problem! Good luck! Peter Quote Link to comment Share on other sites More sharing options...
ChinMuzik Posted November 25, 2016 Author Report Share Posted November 25, 2016 (edited) Hawkeye, thank you. I'm *think* I'm making a bit of progress here. As far as the background noise is concerned I checked the "known issues" and TK noted. Quote Ensure that the Audio In of the MBHP_SIDmodule is connected to ground when not used.A certain digital background noise is common on a 6581 due to a design weakness. It's much less (-90 dB) on a 6582/8580. I assumed the audio in is the jumper for the feedback pots..so after connecting the pots..the background noise went away only if the pots were turned to 0. With the pots set to 0 some of the patches sound thin and turning even slightly reintroduces a fair amount of the noise. Also, the amplitude between each patch is all over the place (some quiet, some distorted at unity gain) Are these inherent issues with the SID and/or design? Edited November 25, 2016 by ChinMuzik Quote Link to comment Share on other sites More sharing options...
jaytee Posted November 26, 2016 Report Share Posted November 26, 2016 I don't have feedback pots installed, so I can't comment on those. On my sammichSID, the external-ins are tied to ground by default (via switching jack) and there's very little noise. As for the volume levels of patches, I can't really say either way without hearing an example....but it's certainly possible to set up patches to have very different volume levels... Quote Link to comment Share on other sites More sharing options...
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