Memorymoog issue, help is needed.

[gencomprodukts]

Regarding the "transpose button", i mean the octave buttons at the top of the mod. wheels
All right for U10 and U7 on the countour glide board.
I do have one MC14016B and a couple of 4558D at home.
I'll do that soon (in approx. 45 minutes) and let u know.
Thanks for all !

[gencomprodukts]

Coming back with my report
Changing MC14016B on socket U10 (Countour glide board) doesn't work, still the same issue.
Now i must check with U7 but the chipset doesn't seems to be a 4558 but a CAI458G (See pictures included. 1st one is the chipset i removed from U7 and the second one the one i do have at home).
Waiting for your confirmation to know if i can put my chipset on this socket. I won't make a mistake.
Thank u !

[Markyboard]

Yes - 4558 is interchangeable with 1458.

[gencomprodukts]

All right, please hold down, i'll check out right now

[gencomprodukts]

Too bad, it doesn't work so it wasn't these chips

[Markyboard]

Drat - so much for guessing. I'll let you know if I come up with anything else. These things tends to play over inside my head for a while.

[gencomprodukts]

All right, i understand and once again i want to thank you very much for your time !
Please let me know if you find something else for this but also my Arp. issue

[Markyboard]

Here are a few more things you can try. Do one at a time with power off and check operation after each step

1) Re-seat (remove, check for bent pins and re-insert each end) the flat ribbon cable going from DMUX board S58 to C&G board S32
2) Re-seat (remove, check for bent pins and re-insert) the flat ribbon cable going from DMUX board S57 to Common Analog Board board S23
2) Re-seat the large 40 pin ribbon cable going from the Digital Board to the Midi/Sequencer board
3) Hit C6 and Enter. This will clear out old auto-tune data (just in case maybe monophonic CV is handled separately in the auto-tune routine).
4) There's one more IC part that may come into play here - U8 on the C&G board. I'm only recommending replacing parts that require no unsoldering/soldering at this point so we'd have to get lucky.
5) Do that hard reset we talked about. You can do this with the power off ( at least I think its the same effect. This is documented in the owner/service manual and really is not a big deal. Again, any piece of conductive metal will do - just don't short anything else. Please confirm afterwards that your patches got wiped out so we know it worked.

Also I know you said no to a scope but do you have a digital volt meter? I'd like to know it your -7.5 V is good.

[gencomprodukts]

Hi Markyboard,
Thanks ! All right, i'll do each step asap, probably on sunday and send my report when it's done. Unfortanetly i don't have a digital volt meter.
If nothing changes maybe i should directly change the CPU, don't you think ?
I read somewhere that it's a Z80-z84c0006peg CMOS 6 MHz dip40 like this one, do you confirm the reference ?
https://www.ebay.fr/itm/Z80-B-CPU-Z84C0 ... Swk4taq0Bd
Mine is a Nec d780C.
Thanks.

[Markyboard]

"Noob" or not I really admire your enthusiasm and "never give up" attitude. I'll spare you the rationale for why the CPU is not the problem but trust me - it's not. I will have to look up the difference between the part you specified and the original. Often times the difference is not a factor - but not always.

Btw - what is your name? I'm headed to NAMM next week so if this goes past Monday I'll follow up when I can.

[gencomprodukts]

Thanks for your kind words & you right, i won't give up
My name's Laurent and you ?
Ok for the CPU and no problem if you can't answer right after my report, anyway there's no hurry. Once again i REALLY appreciate what's you're doing for me, respect !

Ps : the Nec D780C was a Z80 compatible CPU replacement as you can see here : http://www.cpu-collection.de/?tn=0&l0=c ... +%28Z80%29
I've bought my MM+ in the US more than 20 years ago and never had any trouble with this Nec Cpu but i'm considering to buy a Zilog, just in case if anything goes wrong with it in the future.

[gencomprodukts]

Hey, i know that you're at the NAMM show (and i hope you enjoy it!) but i'm coming back with my report and i've got a good news, It works now ! Congrats, you're the boss !
So, it was U8 (CEM3360) on the Common Glide board. I've just reseated and cleaned the socket with deoxit (there was a litle bit of dust) and bam.
Thank you SO MUCH.

Now i need your help for the issue of the the Arpeggio internal clock
Thanks in advance !
Laurent

[Markyboard]

Hey Laurent-

Actually I don't leave for NAMM until Tues morning. When you mentioned Sunday for getting to this I was concerned I might get busy with preparation before departure.

Anyway - that's awesome - well done! I spent several hours since my last reply re-studying everything that affects the monophonic signal path. It's actually pretty simple and makes sense once you sort out the slight name differences between the same signal on one board verse another. This time I took good notes though (I hope).

Glad we solved it - good team effort.

Does the Hold function work in poly mode now? I don't think that faulty 3360 has anything to do with poly mode. Hold mode is driven by the CPU keeping track of each polyphonic voice CV. Same with the arppegiator. So if these are still a problem I recommend doing the reset.

Btw I'm Mark and again, good job!

[gencomprodukts]

Hi Mark, thanks for your answer and well done for this !
Once again you're the boss

Well, the hold function works well now but i'm not sure to understand what you mean by "working in Poly Mode". Indeed, a chord created with the Hold function is only used monophonically (the chord is transposed with one note).

You right about the 3360, it wasn't faulty. I suspect some dust between the legs of the chip and the socket. Cleaning the socket with Doexit and re-seating the chip was the key, indeed, it was the last thing i did and none of the other advice solved the issue.

I hope we'll be lucky when you're back for my Arp issue
I wish you a great NAMM show and i hope you can assist me later.

Have a good trip & all the best !

[Markyboard]

Ah, I misunderstood thinking the 3360 was bad when it was just a dirty socket - even better.

Sorry to confuse you regarding the Hold function. I just meant that the mono button was not lit when you engage the hold function. You can light up both the Mono and Hold buttons at the same time but I don't believe it does anything; its the same as having hold off. I thought it might transpose mono but no, it doesn't.

Ok so we're down to the arpeggiator still not working? Funny, mine also wasn't working earlier today. I almost never use it but was testing out a theory and sure enough found it not working. I powered cycled and still no luck. I than removed the midi cable and powered cycled again and now it works. I think something get corrupted in the digital logic so if you have midi connected give this a try. Otherwise....reset (come on you know you want to ) .