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 Post subject: Re: Luxman 1120A
PostPosted: Mon Oct 09, 2017 9:37 pm 
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Joined: Fri Jun 10, 2005 1:14 pm
Posts: 23
Location: Parksville, BC, CA
Yes, the power switch is the Achilles heal of this series.The switch is some what unique. It is a two part switch with DC at the back end and AC on the front end. You can't just bypass it as the AC is not just for lights it also sends AC to the protection circuit. The switch has a habit of cooking its DC contacts. A good patient tech can rebuild the switch. Or you can get lucky and find a donor switch.Very common problem. Some info on Audiokarma , fyi.
http://www.audiokarma.org/forums/index. ... ch.464861/


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 7:14 am 
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Joined: Tue Jun 14, 2016 8:33 am
Posts: 1050
Location: Kingston, ON, CA
As soon as they talked about this switch problem I figured I'd be running into images and repairs of that exact switch.

The same switch is used in some NAD units from the same time period.

Yes, it can be disassembled and repaired and yes you can find donors.

Taking it apart, repairing and then reassembling into a functional switch is a job for a patient and skilled technician.


And a general note for those who are perusing the thread:

As soon as you mess with the power cable, fusing, and then power switch, you are messing with the full 120VAC and you are getting into the area of full-on liability. Post power, post fusing, lower ac and then dc voltages, not so much of an issue, regarding liability and insurance.

If it ever got into a court of law issue of any sort, that is when this difference comes into being very critical. One can practically stuff dead bloody cats in open buckets of water that slosh about --into a piece of gear, as long as it is post fusing and post AC power. Switching and fusing is the legality danger zone.

All this, of course, with the caveat....concerning gear that has gone through the proper Canadian legal channels to obtain approval for connection to the Canadian ac power grid. That's the critical bit. Pretty well the same for the USA and most of Europe.

About 99.9% of the ebay store stuff you buy off ebay that comes out of china direct, is not legal for use in Canada. I'm not exaggerating.

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(Ken Hotte, of) Teo Audio


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 7:37 am 
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Joined: Sun Sep 24, 2017 12:18 pm
Posts: 8
Location: Cornwall, ON, CA
Thanks very much for the info I have had the switch out and did clean it as best as I could without taking it apart yet but plan on rebuilding the switch since I can't find a replacement.
I'm going to look at my older reciever parts see if I have something that's the same.

I did set up both receivers of a sound test and did find the sound very sharp and clean from the luxman playing FM with the marantz on the other speakers that I have. It's a very tough decision on with one sounds better. I want to get the switch fixed before I don't want leave the unit running for a long period of time. I will have to invite my friends over to help with the outcome of what is a better or cleaner sound.

Thanks to everyone for all the answers and enjoying this site very helpful and informative.

Cheers


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 8:13 am 
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Joined: Fri Jun 10, 2005 1:14 pm
Posts: 23
Location: Parksville, BC, CA
If you are patient you will find a donor switch.
The first Luxman I dealt with that needed the switch replaced I luckily found the switch in an old NAD amp I had as a parts unit.
I also bought a spare recently off Canuck from a fellow parting out a 1120.
They are out there.
If not sell me your 1120,lol.
Its a great receiver.


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 9:07 am 
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Joined: Mon Aug 08, 2016 5:46 pm
Posts: 303
Location: Markham, ON, CA
Yeah the move these days has been to replace all the audio path caps, power supply caps, clean the switches and pots, replace lamps (some use LED instead of the orig 8V lamps). Then, they ask for more than twice what the actual resale price would be otherwise. I don't know if they are getting the money they ask for but, that's the trend with Marantz receivers lately.[/quote]


Ya, I did that with my (owned since new) Marantz 1550. I had 68 components replaced not including the bulbs (they were changed to LED's) and the unit sounds great and looks new. And the renovation cost me $400.00. Not smart money-wise but I really do like the sound I am getting out of it. Perhaps I could sell it for what I restored it for.....

Back to the Luxman....I suggest you have it re-capped, all the controls cleaned, the cold solders redone. This will not only restore it back to its original (and glorious) sound, but will protect it from a potentially damaging failure. Expect to pay a few hundred bucks for the work to be done professionally. If you don't want to do this, then sell it as-is....please don't try and do the work yourself without experience...

Good luck


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 9:46 am 
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Joined: Sun Sep 24, 2017 12:18 pm
Posts: 8
Location: Cornwall, ON, CA
Yes I went through it checking all the caps and replace a couple if the lights cleaned all the pots and switches. This unit hasn't been used much it's mint condition and came from the original owner just a little dust inside. I will be looking for a professional to rebuild the luxman. Any suggestions in the Kingston area or the Ottawa area.


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 Post subject: Re: Luxman 1120A
PostPosted: Tue Oct 10, 2017 12:23 pm 
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Joined: Mon Aug 08, 2016 5:46 pm
Posts: 303
Location: Markham, ON, CA
Jodyb wrote:
Yes I went through it checking all the caps and replace a couple if the lights cleaned all the pots and switches. This unit hasn't been used much it's mint condition and came from the original owner just a little dust inside. I will be looking for a professional to rebuild the luxman. Any suggestions in the Kingston area or the Ottawa area.


I have one guy who I trust and send all my gear to. He is reasonable (not cheap) and does the job properly. He is in the west end of Toronto...sorry I don't know of anyboyd down your way, perhaps someone else knows?

-- 10 Oct 2017 21:23 --

Jodyb wrote:
Yes I went through it checking all the caps and replace a couple if the lights cleaned all the pots and switches. This unit hasn't been used much it's mint condition and came from the original owner just a little dust inside. I will be looking for a professional to rebuild the luxman. Any suggestions in the Kingston area or the Ottawa area.


I have one guy who I trust and send all my gear to. He is reasonable (not cheap) and does the job properly. He is in the west end of Toronto...sorry I don't know of anyboyd down your way, perhaps someone else knows?


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 Post subject: Re: Luxman 1120A
PostPosted: Thu Oct 12, 2017 10:49 pm 
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Joined: Fri Jun 10, 2005 1:14 pm
Posts: 23
Location: Parksville, BC, CA
In the Ottawa area I would try and track down Brad King bktheking on Audiokarma or LeeStereo. These guys know their stuff and are vintage audio restoration specialists.
Worth the effort to track these guys down. Both CAM members.
In that Luxman series all the 2SC1345 transistors must come out along with its complement the 2SA836. The 2SC1345 is problem prone and noisy.


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 Post subject: Re: Luxman 1120A
PostPosted: Sat Oct 14, 2017 3:41 am 
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Joined: Sun Sep 24, 2017 12:18 pm
Posts: 8
Location: Cornwall, ON, CA
Thanks for all the info thinking I'm just going to sell this unit and ask top dollar for it. I Have a complete marantz system all ready setup just need a a mint turntable and can use the money from the luxman to cover the cost. I'm not in a rush and I'm sure the price of these systems aren't going down. Going to watch for a replacement power switch.

Cheers


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