Question about Harman Kardon AVR 435 Receiver

7 Answers

I am not able find a substitute for my standby transformer.

Since my Standby Transformer for Harman Kardon AVR435 stop working I am going crazy. There is zero help from HK (they say that supplyer does not support them, product was discontinued and things like that) Simply they DO NOT CARE anymore for buyers of this model.
I ask them for technical details(there is nothing in Service Manual) about this transformer (part# H03-TXPWSUB635A-4) and they are saying something about secret information law etc..
If anyone could help me I would be very thanksfull.

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  • 6 more comments 
  • zgolinski Jan 29, 2009

    This Transformer is part of internal power supply.

  • zgolinski Jan 29, 2009

    Standby transformer is a part of power supply (see attachment)

  • zgolinski Jan 29, 2009

    To Mr "welcomejee "
    I made order over there 4 weeks ago but there are out of stock. They have the same source of transformers like HK and they will never get it.

  • zgolinski Jan 29, 2009

    For MR "welcomejee "
    They do not have it. I have been waiting for 4 weeks allready. They have the same supplyer like HK
    and they never will get it.

  • zgolinski Jan 29, 2009

    To Mr "MrMark52"



    My receiver is in Europe and I am in USA. My wife hook it up to 220V enstead of 110V.

    "Local Expert" looked at it and is saying that standby transformer is burned out. Maybe he is right - look at the drawing ( this transformer has no protection and 220V could damege it)

  • zgolinski Jan 29, 2009

    To MR "bunnydawg "



    I spend all week try to get help from them ( HK) Look at my first post. They are worthless.

  • zgolinski Jan 30, 2009

    Why is so hard to answer my simple question ?
    I am a giving a product model,part number
    and I tought ,find out for experts an substitute(am not asking for original one because is not on the market anymore and only somewone may has a speare one) would be easy. Maybe somewone has HK AVR 435 and can look at that trafo and tell me some technical detail(type,size,output power and voltages)and I will shop for it.There must be out there somewone who can read schematics.

  • zgolinski Jan 30, 2009

    To Mr "proton77"



    Look at their philosophy : "Not to sound arrogant or self important but we are busy running our shop and repairing our customers equipment. Would you call a Doctor at random and ask what you should take for bronchitis ? Or a Lawyer you never even spoke to before advice on how to file for a divorce?. Think this through a bit, hope you understand our point of view.



    You still think I can get any help from them ?



×

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  • Harman Kardon Master
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Posted on Jan 30, 2009

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  • Master
  • 1,214 Answers

Is this transformer internal to the Harman Kardon? Or is it something the HK plugs into?

Posted on Jan 29, 2009

  • Mark Egan Jan 29, 2009

    I'm going to go out on a limb here and tell you that you may really not want a new transformer, or at least pay what your going to have to pay for it. The reason is, once you get it, your probably going to find that there is more wrong with the amp that is going to be costly to repair.
    Transformers rarely fail today without some cause. And unless you know how to make the repairs, then you may have a good sinkhole to drop some money or time into.

    One other idea that I did several years ago. I had a Radio Shack amp that I loved, and was stolen. Then a few months later, I found one at a Radio Shack that had a bad transformer. Luckily, I knew someone who rewound transformers, and he gave me the wire. I proceeded to unwind each winding, counting each and every turn, for each and every coil in the transformer. After had winding it back together using new wire, I had a new amp. Luckily, it was the primary that had burned up, not any of the secondary windings. So didn't have any issues to be concerned about.

  • Mark Egan Jan 29, 2009

    Diagram doesn't enlarge such that I can read it, but, you made some key comments that maybe I can give you some pointers as to what to do -

    First, and most important, you know it was a primary failure. That can be a good thing, as long as what look to be regulators (the diagram is not real clear on this end, and zooming in on it is worse.) did their job and acted like fuses when double the voltage was applied.

    So, do this -

    Measure the thickness of the transformer stack. From this, you can figure the power needed in VA. Then, what voltage would you want to feed those two regulators? If they are 7805's, then anything to 15 volts or so, right? 7810's, 15-20 volts. And so on.

    Then start searching for a transformer for transistor or solid state use with the same VA ratings or more. Get the footprint of the existing transformer, and maybe you can get something that will fit.

    Just some thoughts. Let me know if you have questions and I'll try to help more.


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  • Master
  • 1,183 Answers

Well,
There is no place, that has a new part for the amplifier . The only solution is that we may need to build one , modify it from an old amp.
You can try the following people, they might have what you are looking for .
http://www.angelfire.com/art2/stereorepair117/highend.htm

http://www.speakerrepair.com/ocsrepairprice.html


Thanks
Proton

Posted on Jan 30, 2009

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  • Master
  • 5,158 Answers

Email the person that owns this site and see if they can help you

http://www.harmanaudio.com/

Robert

Posted on Jan 29, 2009

  • Roberta Smith
    Roberta Smith Jan 29, 2009

    that link isn't for the company as far as i know

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  • Master
  • 8,619 Answers

Hi!

You can buy the transformer from this link---

http://www.encompassparts.com/products/?HAR&start=101

or from

http://www.encompassparts.com/products/?H03-TXPWSUB635A-4

Thanks
Rylee

Posted on Jan 29, 2009

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  • Expert
  • 86 Answers

If you check the old transformer for voltage and current specification then you can buy a generic AC-DC transformer that allows you to set this values.

Posted on Jan 29, 2009

  • Dr_Joseph
    Dr_Joseph Jan 29, 2009

    there is a supplier providing the exact unit you request. inquire their availability
    http://www.encompassparts.com/products/?...

    otherwise get the generic transformer cheap

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  • Master
  • 10,594 Answers

Hi,
You can buy transformer from HERE.

Posted on Jan 29, 2009

  • Shahid Electronics
    Shahid Electronics Jan 29, 2009

    OK, Please check transformer primary pins and I hope you will notice Thermal Fuse connection there and this will blow off for some reason. This fuse pin needs to be connected again.
    If you can post bigger image of schematic that would be helpful or if you can email me schematics at welcomejee at yahoo dot com
    Thanks.

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