Hartke HA3500 input wiring

Discussion in 'Amps and Cabs [BG]' started by Shadoof, Feb 9, 2016.


  1. Shadoof

    Shadoof

    Mar 9, 2014
    Sorry to create a whole thread for what will probably be a very quick answer, but I've been searching and just haven't been able to find the info I need.

    Both inputs on my HA3500 are scratchy and intermittent beyond usability. Fortunately, the whole input section is on it's own little circuit board and connects to the rest of the amp via a plastic clip (or plug, or whatever it should be called). Rather than try to find the exact input barrels from a parts supplier (I haven't had much luck with that anyway), I'd rather just replace the whole thing with two traditional input jacks and wire them straight to the plastic connector with the white, black and red wires.

    Looking at the tracings on the circuit board, I'm guessing that white is input one (passive), black is ground, and red is input two (active). The only thing that seems strange about that is that it means the resistor which pads the signal of the active input is connected to the ground between input one and two. I would think that the resistor would be on the signal path of input two, but I'm obviously not very experienced in electronics so maybe across the ground is correct. That was the main thing I was trying to confirm but I couldn't find any wiring diagrams showing an active and passive input circuit.

    I will most likely not even add the resistor when I rewire since I don't care if I have the signal pad anyway. In that case, I assume I would just connect the input from jack one to white, the input from jack two to red, and the grounds for both to black.

    Am I on the right track, or have I completely misunderstood what's going on here?


    Hartke.JPG
     

    Attached Files:

  2. B-string

    B-string Supporting Member

    I have most likely a different revision schematic attached if that will help.
     

    Attached Files:

  3. Munjibunga

    Munjibunga Retired Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    Get a nylon .22 caliber bore brush and some Caig DeoxIT D5. Clean the jacks with them.
     
    cfsporn likes this.
  4. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    2016-02-10 07.04.30.jpg 2016-02-10 07.04.38.jpg 2016-02-10 07.04.45.jpg 2016-02-10 07.04.51.jpg 2016-02-10 07.05.04.jpg 2016-02-10 07.05.12.jpg
    Well, I've changed mine because of the same reasons. I didn't found the same jacks but I was lucky to have some Neutrik NMJ4HCD2 mono switched jacks. Here you can check a PDF called JACK CIRCUITS. They are ok, but just for the front panel!There is no enough place to use such jacks for the rear one!

    The first thing you must do is to measure the old jacks after desoldering them and see what is happening with the circuit when you put a jack in and out. One of the leads is for braking the signal (I can't explain it better). Do this with the new jacks, too and see which one goes where. One of the leads (they are four) have to be redundant, I think it was the ground braking one so you have three to solder like it is on the old jacks.
    I used some short pieces of nice wire with insulation tube to solder the new jacks on the PCB.


    !You can see on the pictures that the legs of the new jacks are pointing up. That is because it was the only way to mount them on the panel. You have to be careful on that part and my advise is to mount them on the panel before you solder them and see how everything will fit!!!
    Sorry for the bad pictures but I don't want to remove the thing from the amp because it is PITA.

    Cheers!
     
    Last edited: Feb 9, 2016
  5. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    Well I've done this but it didn't help much with the input jacks, they were falling to pieces. But cleaning them was fine with for the rear one.
     
  6. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Those are the most common and most standard Switchcraft style jacks on the planet. Any quality tech or repair shop should have them in stock. They may not sell them to you however, because DIY repairs so often lead to other problems, but to have a shop do this job right (and not damage the PCB in the process) should be quite inexpensive.
     
    BassmanPaul likes this.
  7. Jay Corwin

    Jay Corwin Supporting Member

    Jan 29, 2008
    Sanborn, NY
    Have you tried changing the tube?
     
  8. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    I didn't have luck to find this type of jacks.I wanted to change the rear panel's,too. I tried in different online shops but unfortunately they were different from the hartkes jacks. Not a chance around the place i live either. I think I found some in USA, but was difficult to order them or the saler don't deliver to Europe.
     
  9. I'd be interested in one of these as well.. I have a hartke 7000 with the same issue, it's just old and the jacks have worn out. Be really great if I could find that assembly to just drop in. I could take it to have repaired I guess, but that amp has been a backup to my backup for years, so I'm not super motivated to deal with it. I emailed Samson about it a while back and never got a response.
     
  10. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Can't help you if you don't have access to proper service professionals. That's why they are call professional, they do this for a living and know exactly what they are looking at, where to get the parts, and how to fix it correctly.

    These parts (or equiv. footprint parts) are available all over the world, you just are not looking in the right place but for example any Fender Electronics service center will have access to them and probably have them in stock. Fender parts are available in your part of the world I'm sure.
     
  11. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    No one can help me with that for sure and it's difficult in my region to order parts. If it is for warranty issues it's easy these days (you just send the thing back) but for something not traditional and out of warranty it's almost impossible to get some proper service. No one can take your money here or at least not an official technician who represents the maker and that's why it's easy to learn how to improvise and basically do the things on your own. In my country there is no even one service center for the brands that I use in my rig. There is no Fender service center, too. ;) and yes there are shops that sells Fender parts but mostly guitar parts not electronic stuff. Actually I know how to buy this from Hartke here, I can order it from KORG UK, they are the official supplier for Hartke parts in Europe. But it will cost me too much, one third of the price I paid for the amp. I bought this amp for backup because my LH1000 was send to Thomann for warranty service. It was 15 years old in poor cosmetic condition and with two bad jacks, one on the front and one on the rear side (effects loop I think). It was easy fix and I've done it by myself. Changed the front two jacks with these on the picture I've posted and replaced the one in the back with the working one from the front. That was it and I'm happy with the result.
    Usually I make my orders from Banzai (Germany) and Thomann (Germany) but they don't have such a jack.
    The last time I checked for Europe I can order this type of jack Switchcraft 112apcs (if I recall it right) but it needs to be at least 250 pcs. which is not my goal obviously. Maybe there is a place from where I can buy it but I just didn't found it.
    I'm not trying to complain about that. The things are what they are and my intention was to help the OP.
    Just saying it's easy to learn to solder and do small repairs by your own, every thing could happen and it could happen in the bad possible moment so it's good to know how to do some things. I keep learning...
    Sorry for the long post.
     
  12. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
  13. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    Thank you agedhorse, I really appreciate your help! I know Digi-key from the time when I was looking for a replacement fen for this particular amp but the shipping costs are just terrifying and that means even more money for taxes and VAT when the time comes for the package to be released from the customhouse. 60$ for shipping + 22.87$ the price of the order + 20% VAT+ around 10% some other taxes it is too much for ten jacks. I told you, it sucks here :) Maybe in future if I need some other parts...Hope that will help some folks that are in USA.

    P.S.
    My mistake, 60$ is for priority shipping. But still my account is not fully functional and I can't see the other shipping prices.
     
    Last edited: Feb 10, 2016
  14. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Standard international mail is much less expensive.

    VAT is the cost you pay for living in a country that provides the services it does for it's citizens. If you look at ALL taxes and costs, versus income, it's not all that different overall.
     
  15. reddesert

    reddesert

    Mar 19, 2015
    Not to distract from agedhorse's recommendation of a direct replacement: the reason that circuit looks complicated is that the jack has internal contacts that allow making or breaking a connection when a plug is inserted, and is probably a tip-ring-sleeve jack. This allows doing things like grounding the input when no jack is inserted. And it's probably why it's hard to figure out what the pad resistor is connected to. If you look at the datasheet link from the digikey page, http://www.conxall.com/Drawings/110x-m110x_series_cd.pdf it should be possible to trace the circuit and understand it better.
     
  16. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    Yep. I recently sent a Bartolini onboard preamp including pots to Serbia, it was a whopping $14. Digikey used to have a pretty high shipping/handling minimum, but those days are long gone, at least for domestic customers.
     
    Last edited: Feb 10, 2016
  17. Munjibunga

    Munjibunga Retired Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    Oh, no ... I'd better have Chris order some ...
     
  18. dairyman3833

    dairyman3833

    Aug 19, 2010
    Chicago
    Im not allowed to say really.
    Man TBH if you can, sell this amp, and save for a new one. Try maybe Zzounds.com or americanmusical.com make monthly payments anything. Had this amp and it blows. No matter how many times I brought it in to get fixed something else would break. Finally it literally blew up at a show(this was prio to having a surge protector Furman or something, did cause me to invest though). If you fix it great. But get rid of it when you can even if it takes you 2yrs to save! Buddy of mine had same problem with the 5000 series or whatever it's called, one step up from the ha3500. If you can't fix it blow as much contact cleaner as you can into the input/output jacks and sell it on ebay for parts or whatever. Sorry it's not prolly what you want to hear. I know money's tight everywhere especially for full time musicians. But the above sites let you make payments without credit check type of deals. Don't know what country your in though...Britain, might not apply there but maybe have different sites that have the same principal.
     
  19. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Or, just have it properly repaired by a QUALIFIED service center that really knows what they are doing. There are an awful lot of these amps still out there getting beat to hell day after day and working just fine.
     
    FunkHead likes this.
  20. lifer_

    lifer_

    Oct 19, 2011
    Bulgaria
    I don't know for the OP but my HA3500 was very old, and I bought it in poor condition for a good price. It's made in Korea. I've cleaned it up a bit, there was some nasty paint all over it, changed some of the jacks and the tube :) and now it is my home amp and back up for my main rig. For the price that I payed around 150$ it's a great amp that keep doing its job. I am more concern for my new Hartke LH1000 which failed on his first year and half getting not much abuse from me. My dealer already changed it with a brand new one because they couldn't find the problem, which concerns me more because I can't be sure that the problem could appear again with the new one.
     
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    Primary TB Assistant

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