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Lexicon PCM 80 PCM 90 Repairs
Old 27th August 2020 | Show parent
  #91
Gear Maniac
 

Yes, I narrowed it down to the smd transformer.
Anyone knows where to get a replacement component?
Old 29th August 2020
  #92
Gear Maniac
 

I changed the caps on my PCM80 display as well yesterday. This one had bad leakage even though the screen worked perfect.
So basically these displays are time bombs if you do not replace the SMD capacitors.

These are the ones that I used if anyone else needs the part numbers.

https://se.farnell.com/panasonic/eee...smd/dp/9695915

https://se.farnell.com/panasonic/eee...smd/dp/1850096
Old 1st September 2020
  #93
Gear Maniac
 

I ordered a new replacement PSU from Farnell for the failed first PCM80 one. This time it works without any buzz. Guess the first one I got was defect or broken in shipping.
So the PSU I used works just fine in both the PCM90 and PCM80.
Old 9th October 2020
  #94
Gear Nut
 
pangea2003's Avatar
Can someone recommend a repair centre for my PCM90 in the UK??
It was powering up yesterday.
Today it doesn't... :((((
Thanks
Old 9th October 2020 | Show parent
  #95
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italo de angelis's Avatar
 

Quote:
Originally Posted by pangea2003 View Post
Can someone recommend a repair centre for my PCM90 in the UK??
It was powering up yesterday.
Today it doesn't... :((((
Thanks
Power section is easily replace_able.
Open up the box and check brand and model numebr pf the transformer. DO NOT TOUCH IT with the cable plugged because it hase live parts!
Then search for it on places Farnell or Mouser. There are also equivalent kits.
Old 10th October 2020 | Show parent
  #96
Gear Nut
 
pangea2003's Avatar
Thanks Italo
But I think this is to do with the screen.
I had the typical fog at the bottom of the screen but I couldn’t find anyone that could repair it.
So i ‘dismissed the problem’ and now it’s completely dead
I’ll open it tonight..
what do you recommend to check inside?
Any tips to diagnose the most typical problems inside?
Cheers
Old 10th October 2020 | Show parent
  #97
Lives for gear
 
italo de angelis's Avatar
 

Quote:
Originally Posted by pangea2003 View Post
Thanks Italo
But I think this is to do with the screen.
I had the typical fog at the bottom of the screen but I couldn’t find anyone that could repair it.
So i ‘dismissed the problem’ and now it’s completely dead
I’ll open it tonight..
what do you recommend to check inside?
Any tips to diagnose the most typical problems inside?
Cheers
PCM display, as for *any & every* other unit/brand, can go down in time. That's normal and needs to be expected, sooner or later. 25/30 od service are more than honorable!
PCM displays have a couple or 3 caps soldered on their mini board, generally Panasonic, very easy to find. Problem is that they should be changed BEFORE symptoms occur, like watery characters, bad lighting or total darkness.
Actually I would encourage ANY PCM owner, in particular PCM80 and 90, to have a decent technician to replace those 3 caps (they go for cents!) and keep living a happy life. A good horse runs at the whip shadow!
Your unit unfortunately seemes to be on the other side. That display needs to be replaced, if it's the problem.
Options you have:
-get a non working PCM and use its parts... but the above caveats still apply (change those caps!)
- ask Steve Lenham if he still has replacements available at bendentech.co.uk
- look on Ebay, there's a guy from Australia selling OLED displays. Bit pricey but a good solution... at this point.
Asking Lexicon is worthless. They don't have the parts anymore.
Let us know what did solve the problem for you so that others can benefit for updated info (year 2020) in case problems happen as they *will*!

cheers
I
Old 12th October 2020 | Show parent
  #98
Gear Nut
 
pangea2003's Avatar
I opened it this weekend..

And it looks that the power supply got indeed 'toasty'!
I had one whole unit of space between the rack units..
So I guess, it's just too old to hold it's power after all the years..

Now, I can't find (I don't know) if there's any leakage from the display
at least, by just looking at it..

Are the 3x caps you mention situated at the back of the display?
Can you see them at the back of my display's picture?

I'm trying to find all the parts I need and purchase them online.

Now, the PSU models you guys posted look different to mine
At least the power on the label it's slightly different..
Arte these still compatible with the pcm 90?

Thanks
Attached Thumbnails
Lexicon PCM 80 PCM 90 Repairs-caps.jpg   Lexicon PCM 80 PCM 90 Repairs-display.jpg   Lexicon PCM 80 PCM 90 Repairs-power-supply.jpg  
Old 12th October 2020 | Show parent
  #99
Lives for gear
 
italo de angelis's Avatar
 

Quote:
Originally Posted by pangea2003 View Post
I opened it this weekend..

And it looks the power supply got indeed 'toasty'!
However, I don't know if there's any leakage from the display by looking at it

Are those 3x caps situated at the back of the display?
Please see attached pic if you can

Cheers
Yep- You can clearly see the 3 caps there. It's a small board, quite a PITA to remove as you have to remove the front panel... but with patience you can do it.
replace the caps and the power block... see what happens.
Old 12th October 2020 | Show parent
  #100
Gear Nut
 
pangea2003's Avatar
Thanks Italo

Is that OLED display you mentioned coming with the caps?

I might just upgrade the display altogether if that's the case

Can you see any symptoms of leakage by looking at the front of the display perhaps?

Thanks!
Old 12th October 2020 | Show parent
  #101
Lives for gear
 
italo de angelis's Avatar
 

Quote:
Originally Posted by pangea2003 View Post
Thanks Italo

Is that OLED display you mentioned coming with the caps?

I might just upgrade the display altogether if that's the case

Can you see any symptoms of leakage by looking at the front of the display perhaps?

Thanks!

I don't have the OLED version.

This is the guy from New Zealand... https://www.ebay.it/itm/LEXICON-PCM-...kAAOSwvhte3Jfx
Looks like no caps are there.

I'm not sure your display has leaks. Those signs on the plastic layer may be owed to different reasons.
Old 12th October 2020 | Show parent
  #102
Gear Nut
 
pangea2003's Avatar
Thanks Italo.

That oled display looks great indeed
But it’s also painfully expensive too..

I think I will start by replacing the power supply first, and the 3x caps at the back of the display,
and see what happens..

It might be just dust or dirtiness that got stuck inside of the display, and there’s no leakage in the end
I checked carefully inside, and didn’t see any corrosion coming from the screen

Although, my unit needs a serious clean inside and most of the caps look deteriorated so one thing at the time

Many Thanks
Old 12th October 2020 | Show parent
  #103
Gear Nut
 
pangea2003's Avatar
Quote:
Originally Posted by drifter7508 View Post
I ordered a new replacement PSU from Farnell for the failed first PCM80 one. This time it works without any buzz. Guess the first one I got was defect or broken in shipping.
So the PSU I used works just fine in both the PCM90 and PCM80.
Is this the psu you used for both of your pcm’ s?

http://www.farnell.com/datasheets/2937629.pdf

I’m looking to buy one for my pcm 90
Thanks
Old 12th October 2020 | Show parent
  #104
Gear Maniac
 

Quote:
Originally Posted by pangea2003 View Post
Is this the psu you used for both of your pcm’ s?

http://www.farnell.com/datasheets/2937629.pdf

I’m looking to buy one for my pcm 90
Thanks
LPT45 yes. I think I posted a link to it in this thread.

The displays only have 2 smd caps by the way.
Links in the thread as well.

How about just reading the thread? Have many answers for you ;-)

The oled displays are from New Z. Not Australia.
Extremely expensive imo.

Steve (UK) have no repl. available for now. But... he is working on oled replacements.
Old 12th October 2020 | Show parent
  #105
Gear Nut
 
pangea2003's Avatar
Thanks for your reply.

I wasn’t sure if that was the one or not for the pcm90 as the input current listed on the label of my old psu is slightly different
Although the psu looks pretty much the same

So what’s the third cap next to the other two smd’s?
Did you change that one as well?

I might change all three if I find the correct model..

Thanks
Old 12th October 2020 | Show parent
  #106
Gear Maniac
 

The third one is not a capacitor.
(It’s also mentioned by me in the thread) It’s an smd transformer.
Thats the one who probably makes the buzz in one of my displays. Unfort. I have no clue on how to find a replacement for that component.
Old 12th October 2020 | Show parent
  #107
Gear Nut
 
pangea2003's Avatar
Ok, thanks
Old 3 weeks ago | Show parent
  #108
Gear Maniac
 

I have changed my PCM91 display for an oled one.
Attached Thumbnails
Lexicon PCM 80 PCM 90 Repairs-4cfd6fe1-ebb3-4ec5-8708-c5c4e84be3c8.jpg   Lexicon PCM 80 PCM 90 Repairs-b5dbda30-6229-430d-90a2-e75d2f1d1b7d.jpg   Lexicon PCM 80 PCM 90 Repairs-0c36486d-5105-4508-9a6d-8744a26072a1.jpg  

Last edited by drifter7508; 6 days ago at 09:41 AM..
Old 1 week ago | Show parent
  #109
Gear Nut
 

Hello !
Im having issues with some Buttons on the pcm 80.
Cant access control ,bypass, tempo or tap.
They light up on boot , they also seem to work as when i hold em a little longer i get the "no Button combination" message.
Im New to the machine so i dont know whats going on the software side , read the manual but didnt find anything.
Version is 1.10 ,the effects all work .
Old 6 days ago | Show parent
  #110
Gear Nut
 

Bump , anyway to do a hard reset by pulling something out as i cant access the control menu .
Tried the battery but its soldered...
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