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  1. Collapse Details
    Fix: Oberhiem Matrix 1000
    #1
    meat popsicle playthatbeat's Avatar

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    Have had a Matrix 1000 on the broken pile for years, and i really miss it, so i decided to dig about and sort it.. The main problem is it does not respond to MIDI - no MIDI input will register on the front panel. It idles well, and can be coaxed into a drone with freezer spray, but won't play ball with incoming midi. So, this page: http://wolzow.mindworks.ee/analog/m1k.htm has a nice overview of the board, and a schem. scan. this post: http://launch.dir.groups.yahoo.com/g...im/message/840 details the issue with the Sharp PC900 optoisolator blowing, so i poked pin 4 on it with the scope (etc.) and can't really see much happening. (pc900 circled in red)

    Moving to the MIDI (comms) chip, and looking at pin 6 (marked red in pic) with the scope & starting a midi patch dump from the front panel i see stuff like the attached picture.. all well & good. But, pin 2 (marked blue), the input pin (from pin 4 on the PC900), just never gets close to that while shoving a stream of chords from my Flame 6 in a row into it.. No sign of any nice data at all, just hash.

    has to be the PC900 that is borked.. So i ordered a pair on ebay from a dutch guy for like 2 euro, will swap the fuc*er over soon.

    The annoying thing about taking the board out is You have to undo all the regulators, but hey, we'll manage it.

    I do remember this unit had a sick voice last time i used it - the usual crap - 1 voice sounds different or quieter or not at all when played, so i'll go ahead and work on that as soon as i can get it responding to MIDI in again..
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    Last edited by playthatbeat; Tue 09-10-2012 at 3:47 PM.
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    #2
    meat popsicle playthatbeat's Avatar

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    Cool - got the PC900 - it was actually a PC900V, in it went on a socket and i have MIDI in back

    now to the bogey voice i suspected i had..


    defo voice 4 is borked - sounds wrong/quiet.. and if i move the CEM 3396 the fault follows it.

    i noticed if i swap voice 4 with 6, then voice 4 comes back to life, but BRIGHTER then the other voices.. if i then swap them back again, the chip from voice 6 sounds normal in the position - this means i'll have to do a CAL when i get the new chip to match them all up..

    Found a used chip from the UK on fleabay for $30 - happy days

    more when i get it..
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    #3
    meat popsicle playthatbeat's Avatar

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    New CEM3396 arrived, in it went, and it's fully working

    Now the bad news.. i changed patches, and 2 other voices sound like shit now.. no bottom end/sub osc in voices 1 and 3 now. I suspect they were always like this, and because mostly they sounded OK, i missed it.

    SO. no more slim-body 3396 on fleabay, BUT, a shedload of wide-body versions. In fact, for as little as $3 You can get one - BUT, all the cheap ones bar a few are (pictured as) date 8709 on ebay.. lots of diff vendors, but same datecode on them all.. The dead chip i removed was 8852, that would make it december 1988, and it was a slim-body, so iguess march 87 for a spare batch of wide-body chips is plausable, but STILL.. So i ordered some wide-body ones, but with a different date code to the majority on fleabay, just to be different. lol. I ordered 8624 coded, so thats end of march 1986 i think..

    I have no idea if the widebody chip is the same as the slim, i guess we will find out soon enough.

    I am having to make an adaptor, to allow wide cem3396 to be used in a matrix 1000, as it takes the slimmer, rarer version. So, i ordered some 'turned pin wire wrap SIL sockets' and some stripboard.. i have plenty of widebody sockets, so i'll knock up something using these bits when they all arrive. I thought i could make a tower adaptor, using 3 slim sockets and a wide one, and shorting out one of the slimmer ones.. but fu*k that, i'll make something a bit more reliable..

    so yeh, nearly there..
    Last edited by playthatbeat; Thu 27-12-2012 at 4:18 PM.
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    #4
    meat popsicle playthatbeat's Avatar

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    Job done.. chip convertors made.. all good after a CAL..
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    meat popsicle playthatbeat's Avatar

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    Got the batch of NOS CEM chips from eBay - seller was hkutsource - i thought it was going to be a fishy experience when the image in the item listing was 'that' date code, and then when i got a msg from them saying the package had been returned to them as un-deliverable, i was SURE i was being dicked in some form.. BUT, they were sound enough to send it out again, without a surcharge, and they arrived in good working order.. Datecode was 3396 - week 33 of 1996. I now have a nice batch in the rack for the next time the m6/1000 takes a sh!t on me..

    I see the seller now has a note re: the september/october Post issues, and has changed it's shipping to originate in Hong Kong rather then China.. This is how most of the far eastern vendors have gone the last few months.. It seems stuff from HK is more likely to turn up in one go then stuff from china!

    SO, get them in now guys, might as well before they go for good, the price is right @ $6 a pop!
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    meat popsicle playthatbeat's Avatar

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    Noticed ysterday a voice has failed again in my m1000.. the usual shit - you can hear that one voice is missing a componant of the patch as it plays. This time i was using a 'doof' tom-tom sound, and every 6th note was only noise, no OSC componant. so, time to get out the screwdriver again

    How long was that? how long did the last fix last? (see date of previous post..)
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    Matrix-1000 Woes
    #7
    Curious

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    Greetings PlayThatBeat!

    Well, I'm running into an issue. I thought that I just had one of the CEM3396 chips going bad, but after running the voice diagnostic and switching a couple of chips, the voice issue didn't change.

    Also, I have found that depending on what patch I have selected, I notice one of two problems.
    The first issue sounds like one of the two oscillators isn't triggering on one voice (currently voice #1 based on the diagnostic). Voices #2-#6 sound fine.
    The second issue on other patches sounds like voice #1, #5, and #6 are almost inaudible.

    When I opened the unit up and swapped a few of the CEM3396 chips, it made no difference. The same voices were behaving the same way.

    Any thoughts on this? Your insight is greatly appreciated!

    Oh, and when I was thinking that my issue was related to the CEM3396 chips, I found the following. I have not done business with this company, but this appears to be the right chip for the Matrix-1000 and it isn't a bad price.
    http://www.aliexpress.com/item/CEM33...895826382.html

    Thanks!
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    #8
    meat popsicle playthatbeat's Avatar

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    That Link to Aliexpress looks good! as long as they actually send You that exact format of the chip it will work fine in the M1000 - thats the right shape for the sockets. Shame these didn't appear available when i needed them a while back! I'm going to order a pair of these now, since my M1000 is misbehaving on 1 voice now, and i'm guessing it'll be a slim-body chip that has gone down on me.

    Are You sure all of Your chips are working? If you run only 1 chip at a time in socket 1 (or whatever socket works..) , then check all of them using the same test patches - do they all have proper function of:

    *square and saw waveforms
    *lowpass and highpass filters
    *noise generators

    You will find a bad chip quickly by just listening. remember some chips might ONLY lose the waveforms, or ONLY the noise generator, while other things function normally.

    The totally dead voices sound like they might be related to the 2 types of chips in each voice.. one is the TC4051 datasheet here: TC4051,4052,4053BP/BF/BFT - Toshiba a multiplexer, and the other is a 74hct32 datasheet here: 74hc32 which is a quad OR gate.. Both of these carry out routing and switching to and from the chip, on instructions (down the line) from the CPU and system software. They are the 'knobs and switches' on the synth

    If you look at the datasheet for the CEM (datasheet is here: www.synthtech.com/cem/c3396pdf.pdf ) you can see most of the pins are just inputs for control voltages.. You can control all the things the synth on the chip should be able to do using these. You can test these pins to see if any voltages are _actually_ getting as far as the chip when you play. if they ARE, but no sound is coming out of the output pin, then the CEMs have to be the problem. If there are no voltages ending up at the input pins of the CEM, or the state is not changing correctly at the pins as you play, then the 74 and the TC have to be the issue.

    on my matrix 6 i had to replace these chips to get the voices to behave. was a bit irritating, but the chips were cheap, and it made things good.
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    #9
    meat popsicle playthatbeat's Avatar

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    Testing my m1000 now.. defo a voice issue.

    To View the Voices as they are played, and find the dodgy voice, i'm doing this:

    in "Ext Funct" press 7 then Enter, press + to display "1" Press Enter again & the display shows the voice as it is played..


    My first run showed voice 3 and 6 are not happy. Looking from the front of the m1000, that means the 3rd chip from the right, and the most left chip. (yes, a bit backwards.. right to left increasing in value!) So, i swapped them with their working neibors, and the fault moves with the chips. the fault is somethign to do with the VCA or filter? it makes some noise, but it's wrong, and low level.

    OK. time to make a call on weather to build more sockets, or hit Alibaba at the link above..
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    #10
    meat popsicle playthatbeat's Avatar

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    quick blast on fleabay, and it's got shedloads of widebody chips, from a couple of batches. meh, i have 4 of them here, but only enough bits to make 1 socket adapter.. so, gonna grab a pair of the slim-body chips from alibaba now, while i can. yes, it's more expensive then buying more long 'turned pin wire wrap SIL sockets', but wtf, who cares. Let's see how long they last. Maybe there is a reason the slim-body chips are so scarce - MAYBE THEY ARE SHITE!!
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