Question about Lexicon MC-1 Amplifier

1 Answer

MC1 Switched Power Supply

The power supply failed because overheating.
The large capaciter was broken, I changed but no success.
Please inform me about the voltage between blue, black, red
and orange wiring.

Hans-Joachim Meyer,

Posted by on

  • 1 more comment 
  • Anonymous Jan 29, 2009

    I also have an MC-1 with a dead power supply. The outputs are:

    Blue: -15V
    Black: 0V
    Red: +5V
    Orange +15V

  • Kevin Z
    Kevin Z Feb 25, 2014

    You can buy a whole new power supply from Mouser. It is super easy to swap out - just a handful of philips screws and two plug connections. Emerson NFS40-7610J or equivalent.

  • Kevin Z
    Kevin Z Feb 25, 2014

    about $55


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,512 Answers

Hi Hansjo. You may find that if one capacitor has failed, then there may be more. If you see any signs of bulging, leaking, or pushing the bottom out of any caps, then It is a good idea to just change them all. For the small expense, it is worthwhile knowing that your power supply has fresh caps. Try the amp and then see how it goes. If you still have problems, get back to me here and we can talk about it more.


Posted on Feb 29, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Technics su-g75 drawing/schematic? when hit power button fuse in power supply blowout.

Fuses blow when there's an overload. This is most likely caused by a semiconductor device(s) shorted. In amps this is often cuased by speaker wires that have touched while on power. The main culprits are the devices on the heat sink. If they are transistors then connecting an Ohm Meter accros the terminals of the transistor(s) (amp switched off) will show as if you have touched the test probes together! More than one device might have blown!!

Dec 23, 2014 | Technics Audio Players & Recorders

1 Answer

My amp was blinking while it was working then it went off.Now it doesn't power up..Crown Xti 4000

Power supply likely failed. Electrolytics are the primary culprit.
It should have a switchmode power supply, so it is lmost likely the 5 volt section failed.

Sep 17, 2012 | Crown XTi 4000 Amplifier

1 Answer

I have a Tandberg TR2075 receiver. Recently is has started to fail this way: the left channel does not sound, I have to turn the receiver off and on several timea until suddently it sounds. I think is...

Replace the power supply capacitors and most of the electrolytic caps at the power amp
These are fairly cheap at mouser or digikey
Also resolder any areas associated with the power supply and the power amp
Does the unit work ok with headphones?

Jun 27, 2011 | Audio Players & Recorders

1 Answer

When i turn on my audiolba 8000a amplifier no sound on left channel after 1 to 2 minutes sound will come in. How to resolve this problem? If possible which spare parts need to change please state affected...

I think ,with the issues youve stated , that it's actually some solder joints that make a connection AFTER the amp has heated up a bit.
The issue could also be a Large power supply capacitor that is starting to fail.

Aug 25, 2010 | Audio Players & Recorders

1 Answer

The fuse keeps blowing in my amp, changed the fuse several times but just keeps blowing!!!

You have an overload in either the power supply section or Main amp section. Culprits in the power supply are the transformer, the Large Capacitors, rectifier, voltage regulator.
In the Main amp anything on the heat sink.
Look carefully for burnt or damaged parts. If there's more than one fuse, follow the path of the one that is blowing it might lead you to the suspect.

Dec 15, 2009 | Alesis RA-150 Amplifier

1 Answer

Memory part of a Technics tuner does'nt work

Identify the main area on the pc board, and look around for a odd shaped Electrolytic capacitor. It might even have odd printed board number IE: mc500, not c500, for example.
If you find one it could be a Memory Retention Capacitor. They often have a low value 0.22uf and low voltage 5.6 for instance. It could have failed and so not supply the chip that stores the information, with power when switched off.
I can't say it will have one, but it's worth a try. They are in the Maplin catalogue for under £5!

Nov 14, 2009 | Audio Players & Recorders

1 Answer

Marantz PM66SE AMP: The fuse in the board is burned after a few seconds when the power is on. COuld you please help me to diagonose the issue? Thanks a lot!

You have an overload in the power supply or audio output stages. Look around sometimes a part may be burnt, have a hole in it etc... In the power supply it could be a diode, the large Elec Caps, Bridge Rectifier, Voltage Regulator. In the Audio Output, one or more large transistors, on the heatsink, or an IC if it uses one.

Oct 12, 2009 | Audio Players & Recorders

1 Answer

Looking to purchase a Behringer MX-9000 power supply

The desk itself is discontinued, however if you have a ring round the Behringer dealers for your area, they might have stock, or be able to obtain a spare power supply for the desk. Failing that, you're in the second hand area, so a popular online auction site, or google for people selling one. Unless they have a broken desk though, you might find that they only come together with the desk.

Sorry can;t help more!

Mar 05, 2009 | Audio Players & Recorders

1 Answer

Failed power transformer

With out make and model, I can not supply parts information. Please update this with that info. Also, depending upon the age of the unit, parts may not be available. Are you sure that the problem is the transformer? This part is rare to fail.


Jan 21, 2009 | Cambridge Audio Audio Players & Recorders

2 Answers

B&W PV1 Subwoofer

Make sure that your amp is putting out proper signal to the sub woofer.

If the feed from the amp is okay, the power amp and our the power supply in the sub woofer may have become defective. This will require to be serviced.

Jerry G.

Jun 13, 2008 | B&K AV 125.7 7-Channel Amplifier

Not finding what you are looking for?
Lexicon MC-1 Amplifier Logo

Related Topics:

691 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lexicon Audio Players & Recorders Experts


Level 3 Expert

100140 Answers


Level 3 Expert

4706 Answers

The Knight
The Knight

Level 3 Expert

70943 Answers

Are you a Lexicon Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides