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Re: Screen Repair Help

Re: Screen Repair Help

2014-12-09 by vic.doulepov@...

EPRelectronics used to have those (http://www.eprelectronics.com/store/E-mu-Drum-machine-Command-Station-PARTS/E-mu-Command-Stations/BLUE-LCD-display-24x2-for-MP-7-XL-7-PX-7-p165.html) but now it's listed as out-of-stock. 
I sporadically see these same ones coming up at ebay, and right now there's just another one @ $59 - do a search for "e-mu mp-7 display". 

Re: Screen Repair Help

2014-12-09 by bezowinz@...

Thanks!

Doing some research, my understanding is that the problem could be the screen or the power supply. Any opinions on that?

Re: [xl7] Re: Screen Repair Help

2014-12-09 by bezowinz@...

Thanks!

Any 24-2 LCD? Great to know!

I've never soldered anything in my life, though it doesn't look like rocket science. I have other aging equipement, so this would be a good skill to pick up.

Can you clarify regarding the 2x7 & 2x1 headers? Google search is doing nothing for me since I don't really know what I'm looking for.

And any other info you can point me to would be appreciated. Vids, instructions, etc.

Thanks again!

Re: Screen Repair Help

2014-12-09 by bezowinz@...

... also, in doing some research, my understanding is that the problem could be either the LCD screen or the power supply. Any opinion on that?

Re: [xl7] Re: Screen Repair Help

2014-12-09 by Daniel H

most of the 24x2 lcds on ebay will have a 2x8 pin terminal on the board but the extra two are just the power connections.
the problem could be with your psu, though.. only way to check is to measure the output with a vu meter. i just switched mine because it looks better. maybe check that out before ordering any parts ;)

On Tue, Dec 9, 2014 at 3:39 PM, bezowinz@... [xl7] <xl7@yahoogroups.com> wrote:
 

... also, in doing some research, my understanding is that the problem could be either the LCD screen or the power supply. Any opinion on that?


Re: [xl7] Re: Screen Repair Help

2014-12-09 by Daniel H


On Tue, Dec 9, 2014 at 5:43 PM, Daniel H <xxxdna@...> wrote:
most of the 24x2 lcds on ebay will have a 2x8 pin terminal on the board but the extra two are just the power connections.
the problem could be with your psu, though.. only way to check is to measure the output with a vu meter. i just switched mine because it looks better. maybe check that out before ordering any parts ;)

On Tue, Dec 9, 2014 at 3:39 PM, bezowinz@yahoo.com [xl7] <xl7@yahoogroups.com> wrote:
 

... also, in doing some research, my understanding is that the problem could be either the LCD screen or the power supply. Any opinion on that?



Re: [xl7] Re: Screen Repair Help

2014-12-10 by bezowinz@...

I see. The E-Mu LCD already has the 2x7 & 2x1 Headers. I'd have to buy & solder them to the generic LCD.

This is all new to me, so bare with me please.

The only VU meters I'm familiar with measure audio volume. What am I looking for?

And the power supply is internal? Not the cord/plug, correct? Again, can you point me in the right direction? Web searches are tough when you don't know what you're looking for.

And I thought I was just installing a ROM.

Re: [xl7] Re: Screen Repair Help

2014-12-10 by Daniel H

sorry for the confusion i meant a multimeter (not vu): https://www.sparkfun.com/products/12966

well this is certainly more complex than a rom install!
anyway, the psu is internal.. there is a picture in the photos section that i posted which shows the psu. you can see a white ribbon cable going from the psu to the motherboard. you disconnect that from the psu and measure each rail individually. the output will be labelled ont he board and should be something like +12 -12 Ground +5 -5 or something.. you'll have to look on the board for the exact values or find the service manual.
you make contact between the + tip on your multimeter probe to one of the power rails (+12v for example) and the other multimeter probe contacts with the ground. The output measured should be what the board/service manual says. if it is too low then you can assume the psu is at fault. this would need to be done while the unit is on so there is a risk of injury from shock or frying your unit if you make the wrong connections.
if you are inexperienced with this i would suggest taking it to a repair technician and have them check it out.
there are not going to be any tutorials etc online for this unfortunately.. it is a matter of reading and thinking twice before you do anything! i am not a service technician or expert with this at all, i have just been able to figure out some basics by getting service manuals and reading online..but i have been able to to some minor repairs like replacing knobs/switches, and replacing the LCD screens in some of my units. i have also done a psu upgrade/replacement for my emu ultra sampler.

I would check the psu to see if it is ok before doing anything. replacement PSU's can also be found online for pretty cheap


On Tue, Dec 9, 2014 at 11:55 PM, bezowinz@... [xl7] <xl7@yahoogroups.com> wrote:
 

I see. The E-Mu LCD already has the 2x7 & 2x1 Headers. I'd have to buy & solder them to the generic LCD.


This is all new to me, so bare with me please.

The only VU meters I'm familiar with measure audio volume. What am I looking for?

And the power supply is internal? Not the cord/plug, correct? Again, can you point me in the right direction? Web searches are tough when you don't know what you're looking for.

And I thought I was just installing a ROM.


Re: [xl7] Re: Screen Repair Help

2014-12-10 by bezowinz@...

Ahh. OK. I wasn't finding anything regarding VUs & power supplies, obvious now.

I'll do some research 1st, but yeah, this might be a job for a repair technician. Sounds simple, but I'd be pissed if I fried my unit.

Would there be any other symptoms of a failing power suplly you're aware of? Low volume from outputs or headphone, etc.?

And I'm not recognizing your picture of the PSU. Is it in the Photostream, Albums or Photomatic section?

Any chance you know the model number or anything else that would help me locate a replacement power supply?

If they're cheap, it might be easier, cheaper & safer to just replace it. If it's not the problem, I'd have a back up for when I needed it.

Thanks again! This is very helpful. This information has been tough to come by.

Re: [xl7] Re: Screen Repair Help

2014-12-10 by bezowinz@...

Actually, after watching the vid you linked and reading your explaination again, this sounds quite simple. Finding your picture would help even more. And with all the aging equipment I have, this will be a necessary skill.

Re: [xl7] Re: Screen Repair Help

2014-12-11 by bezowinz@...

Maybe we have different settings. The 1st picture I see is a close up of an XL-7. I'll keep poking around for it.

My ROM arrived. I have to open up my PX-7 to install it any way. From your description, I'm sure the PSU will be obvious.

I'll start with the multimeter since I need it either way and go from there.

The screen is still very readable, so I can work with it until I figure this out.

Thanks again!

Re: [xl7] Re: Screen Repair Help

2014-12-11 by bezowinz@...

I came across this in the manul:

Power Consumption: 20 Watts
Voltage Input: 90VAC-260VAC at 50Hz-60Hz

Am I looking for a 20 watt power supply? Does this tell me anything else?