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Thread

MTM display replacement

MTM display replacement

2014-03-20 by <alfpaches@...>

Hi group!

I´m looking for help to replace the original MTM display. I bought recently a new one in blue light and white characters.

 http://www.ebay.co.uk/itm/131068298298?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

 

 I have scarce knowledge about electronics so I left the job in the hands of a friend, he repairs guitar amplifiers, but are not familiar with this type of equipment. The point is that he has installed the new display and although it is lit, the characters don´t appear. I sent him the photo that is in the Simmons group and he has followed these particulars. So I have no idea which may be failing. I just sent him a few minutes ago the MTM service manual, I suppose this can help him. If you've got any advice will be well received. Thanks in advance!

 
 
 


 

Re : [Simmons Drums] MTM display replacement

2014-03-20 by Jacquot.Patrice@...

Hi Alfonso !  :)
there is an adjustable screw inside  on the PCB, not far close to  the front house & the display   ... that should adjust the contrast...
Not very good quality on mine ... it sould be possible to replace it for a good one...if needed...

If the display is too strong , (too much light ) then I know there is some resistor to add or modify the value...
But I don't know what value ^^

hope that helps,
Patrice.




----- Mail d'origine -----
De: alfpaches@...
À: Simmons Drums <Simmons_Drums@yahoogroups.com>
Envoyé: Thu, 20 Mar 2014 15:32:32 +0100 (CET)
Objet: [Simmons Drums] MTM display replacement





 

Hi group!

I´m looking for help to replace the original MTM display. I bought recently a new one in blue light and white characters.

 http://www.ebay.co.uk/itm/131068298298?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649


 I have scarce knowledge about electronics so I left the job in the hands of a friend, he repairs guitar amplifiers, but are not familiar with this type of equipment. The point is that he has installed the new display and although it is lit, the characters don´t appear. I sent him the photo that is in the Simmons group and he has followed these particulars. So I have no idea which may be failing. I just sent him a few minutes ago the MTM service manual, I suppose this can help him. If you've got any advice will be well received. Thanks in advance!

 
 
 


 




Re: Re : [Simmons Drums] MTM display replace ment

2014-03-20 by ALFONSO PACHES

I´ll try that. Thanks, Patrice!!!!


El Jueves 20 de marzo de 2014 17:54, "Jacquot.Patrice@..." <Jacquot.Patrice@...> escribió:
 
Hi Alfonso !  :)
there is an adjustable screw inside  on the PCB, not far close to  the front house & the display   ... that should adjust the contrast...
Not very good quality on mine ... it sould be possible to replace it for a good one...if needed...

If the display is too strong , (too much light ) then I know there is some resistor to add or modify the value...
But I don't know what value ^^

hope that helps,
Patrice.




----- Mail d'origine -----
De: alfpaches@...
À: Simmons Drums <Simmons_Drums@yahoogroups.com>
Envoyé: Thu, 20 Mar 2014 15:32:32 +0100 (CET)
Objet: [Simmons Drums] MTM display replacement





 
Hi group!
I´m looking for help to replace the original MTM display. I bought recently a new one in blue light and white characters.

 I have scarce knowledge about electronics so I left the job in the hands of a friend, he repairs guitar amplifiers, but are not familiar with this type of equipment. The point is that he has installed the new display and although it is lit, the characters don´t appear. I sent him the photo that is in the Simmons group and he has followed these particulars. So I have no idea which may be failing. I just sent him a few minutes ago the MTM service manual, I suppose this can help him. If you've got any advice will be well received. Thanks in advance!
 
 
 

 





Re: MTM display replacement

2014-03-21 by <philmurr@...>

The old display contrast used -5V to 0V. The new ones needs 0V to +5v.

You need to cut one of the legs from the pot Patrice mentions and connect to +5V

Send me your email address and I can send you a photo of one I modified...it's quite easy and the final result is superb :-)

Re : [Simmons Drums] Re: MTM display replacement

2014-03-21 by Jacquot.Patrice@...


Alfonso, regarding this display, Phil is exactly the guy to talk to !



----- Mail d'origine -----
De: philmurr@...
À: Simmons Drums <Simmons_Drums@yahoogroups.com>
Envoyé: Fri, 21 Mar 2014 21:33:19 +0100 (CET)
Objet: [Simmons Drums] Re: MTM display replacement





 

The old display contrast used -5V to 0V. The new ones needs 0V to +5v.

You need to cut one of the legs from the pot Patrice mentions and connect to +5V

Send me your email address and I can send you a photo of one I modified...it's quite easy and the final result is superb :-)




Re: Simmons_Drums

2014-03-25 by <alfpaches@...>

Finally it´has worked!. :)

My tech had to replace the original trimmer by a new on with a higher value.

Thanks to all for your help, specially to Patrice, Phil, and Alan.

I´ve posted some pics in potos section.

Re : [Simmons Drums] Re: Simmons_Drums

2014-03-25 by Jacquot.Patrice@...

Perfect, well done !  :)

----- Mail d'origine -----
De: alfpaches@...
À: Simmons Drums <Simmons_Drums@yahoogroups.com>
Envoyé: Tue, 25 Mar 2014 12:50:42 +0100 (CET)
Objet: [Simmons Drums] Re: Simmons_Drums





 

Finally it´has worked!. :)

My tech had to replace the original trimmer by a new on with a higher value.

Thanks to all for your help, specially to Patrice, Phil, and Alan.

I´ve posted some pics in potos section.




Re: Simmons_Drums

2014-03-25 by <music@...>

Nice ! Well done! This looks fantastic!
:-)
Alan

Re: Simmons_Drums

2014-03-25 by <music@...>

Actually, what was the value of the Trimmer he replaced the original with?
I like what he did to remove it from the PCB and instead solder 2 leads to the new Trimmer. Very clean :-)
Alan

Re: Simmons_Drums

2014-03-26 by <alfpaches@...>

About the new trimmer, I have to say that what you can see in the pics was only a trial. :)

My technician followed almost all your instructions, but he didn´t get, at first, a good result. After adjusting the original trimmer, the characters were shown on the display, but they were only visible if you watched from a certain position (about 45 degrees above the display), but not if you´re placed in front of it. So he thought maybe athe new display needs  a higher power trimmer to get a higher margin in relation to the degree of contrast. The one shown in the pic is 10 while the original is 5 (forgive my ignorance, but I do not know if this relates to volts or other electrical measurement). Now that we know it works, it will put a new trimmer, yes, this time soldered to the PCB. :)

Thanks again for your help!

Re: Simmons_Drums

2014-03-26 by <music@...>

Glad I could help, but actually Phil is THE guy you want to thank.

Re: Simmons_Drums

2014-03-26 by <alfpaches@...>

Oh, yes!.That´s true. Sorry for the mistake. :)

Re: Simmons_Drums

2014-03-27 by <philmurr@...>

Please guys, all credit must go to "fireballxl27" who first replaced the display, and wrote about it on-list last year.

I just copied what he did :-)

 

Re: Simmons_Drums

2014-03-27 by <alfpaches@...>

Yes Phil, that´s completely true.

But I only could find the pics that "fireballxl27" share in the group, but not the info about how to do it. So, thanks also to the rest of people here who helped me. :)

Re: Simmons_Drums

2014-03-27 by <music@...>

My, but we are a humble and polite group... hehe..
The main thing is your MTM now has a lovely new LED illuminating your studio.. :-)

Cheers
Alan

Re: MTM display replacement

2014-04-14 by <music@...>

I have added some pics to the MTM LED Replacement Folder in PHOTOS...

Instead of soldering 16 wires directly to the new LED Display, I chose instead to solder a male 16 pin Header to it... then fabricated a new flat ribbon cable with a 2 x 8 Wire to Board Male Connector on one end and a 1 x 16 position Female Socket Connector to mate with the Header on the LED Display. This makes for a cleaner look and easier maintenance should the LED ever need to be removed or replaced. Also, as per recommendations in the above posts, I removed the factory 4k7 Trim Pot and swapped in its place a 10k single turn with its top left pin lifted off the board and soldered to a wire connected to the +5v leg of the Resistor R7 (that also provides +5v to the LED in the new Display). The 10k Trimmer allows for a very wide scope of adjustment being possible.  Very cool ! :-)

Cheers
Alan

Re: MTM display replacement

2014-04-15 by <philmurr@...>

Neat...

And nice to see you put a date on it when you replace the battery :-)