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Overload led on 2 channels

I have a parasound hca 806 6 channel amp.channels 4 and 6 overload led's are on. channels 3/4 and 5/6 can be bridged and 1/2 cannot be bridged. I replaced all 6 speaker relays and that did not fix it. Any ideas ???

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  • Oran Nelson Nov 12, 2007

    Yes, I am using it as a three channel amp right now with the channels that are ok.

  • Oran Nelson Nov 12, 2007

    They will also light up with nothing connected.

  • Oran Nelson Nov 12, 2007

    Do you have any idea what they might look like?

  • Oran Nelson Nov 12, 2007

    Ok thanks! I will open it up and see what I find. This is a home theater amp by the way.

  • Oran Nelson Nov 12, 2007

    Ok there are 5 for each channel. should i replace them all?

  • Oran Nelson Nov 12, 2007

    Where can i find them? raidio shack or from the dealer?

  • Oran Nelson Nov 13, 2007

    there are 2 on each side of a small one that has no part # that I can see.
    the part #s are
    ..a1386 and a3519

  • Oran Nelson Nov 13, 2007

    yeah I could replace them myself, I replaced the speaker relays.

  • Oran Nelson Nov 14, 2007

    These are what they look like except mine has an a3519 and a1386 otherwise exact.

  • Oran Nelson Nov 14, 2007

    2SA1386 and 2SC3519

    part 2sc3519
    has an extra leg?

  • Oran Nelson Nov 14, 2007

    I can e-mail it to you

  • Oran Nelson Nov 14, 2007

    Hire is a pic of 2SC3519 that I found

    http://www.bluestar-online.com/SearchRes...

  • Oran Nelson Nov 14, 2007
  • Oran Nelson Nov 14, 2007

    ok sorry my bad, er the website's bad, anyway I would agree they most likely have the wrong pic. I too am curious about the 'little guy' between the pairs.

    I have the schematic for this amp do you want it still?

  • Oran Nelson Nov 15, 2007

    Thank you! I will have to go and get some tool(s) to do this. The reader that you are refering to I dont have. I assume I can go to radio shack to get it.I will let you know what i find out.

    thanks again

    Oran

  • Oran Nelson Nov 15, 2007

    Hi,
    Just a quick question. I noticed in the amp has 2 seperate boards .channels 1,3,5 are on one side and the board for 2,4,6 are on the other. every little diode, resistor ect. the first numerical digit is in the area for that channel.
    Diode z103 is in the area for channel #1, should I be checking z403 and z603 for channels
    4 and 6? well I will check them all anyway.
    My experience at this point is pretty green. haha.

    Thanks,

    Oran

  • Oran Nelson Nov 15, 2007

    Ok, from what it sounds like I have to de-solder before I test anything or do I test with them as they are?

    as they are....
    z103,z203,z303,z403,z503,z603
    all read about 750's- 770

    and I cannot find any change from the any of the bce's from channels 2,4,6 and one channel from the other side(cant remember which one).

  • Oran Nelson Nov 16, 2007

    Hi , I'm just looking for anything that is different or dead? I did a few last night , some of the q's are tough to get at. i have found that everything has resistance so far.

  • Oran Nelson Nov 17, 2007

    hi,

    With the meter set at ohms 200k range.
    R638,r438,r138,r338,r238
    The meter starts at about 15.0 is and climbs to
    21.8 on all of them, R538 did not test The power cord at the back is in the way.

    do these readings make sense?

  • Oran Nelson Nov 18, 2007

    Hello,

    Ok I too out one a1386 from channel 4

    BbEr=11.05 at 20m the only setting that would show.
    BbCr=10.67 at 20m

    BrEb,BrEb,CbEr at 20m,200k,2k and 200
    the meter stayed at 1.

    The Emitter seems to me like it is not showing anything.

    Does this help so far?

    Oran

  • Oran Nelson Nov 19, 2007

    I was going to ask what the white paste was, so thanks for telling me. The small transistor is a c3421 so I would get a 2sc3421 right?

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I think your prob is not simple if anybody tell u do this or tat don't do it because i have a same prob but my fault is try myself and it becomes more disable and father beaten me
so acc to my opinion go to the expert and where u buy this he normaled your problem don't worry i do the same thing
and u again enjoy
WARNING:
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IF U HAVE TRUST ON ME MY ID IS
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Hi Oranzky,

Will the overload LED's light up with the Speakers disconnected?

Posted on Nov 11, 2007

  • 20 more comments 
  • Greg Stokes
    Greg Stokes Nov 12, 2007

    Hi Oranzky,



    The Overload LED's get turned on by the overload ciruit. Chances are real good that you channel 4 and 6 power drivers are blown. Basically shorted out. I would investigate what the chip numbers are for the Power Drivers. May be aan easy Soldering job to replace the drivers.

  • Greg Stokes
    Greg Stokes Nov 12, 2007

    Hi Oranzky,



    They will be the components bolted to the aluminum blocks. They have to have a heat sink to carry the heat away. Check to see if you can access the area easily and maybe replace these Amplifiers. I have not had to replace amplifiers in a Car Amp before but I have done plenty in Home Audio Equipment.

  • Greg Stokes
    Greg Stokes Nov 12, 2007

    Black with Silver colored legs and bolted to the heat Sink.

  • Greg Stokes
    Greg Stokes Nov 12, 2007

    Hi Oranzky,



    Yes, to get best results you should replace them all. It balances out the circuitry better. I would only replace for channels 4 and 6 though, so thats 10 Drivers. Are they all the same? The amps I have seen do have them all lined up. Do you think you can accomplish this task of replacing the Amplifiers? Tell me what the Number on them is and I can find you a good price on 10 of them. You can go to http://eskc.com/default.asp and search for the part number to see if they have what you need.

  • Greg Stokes
    Greg Stokes Nov 13, 2007

    Ok Oranzky,



    Give me a chance to dig up some parts for you. Thank you so much for letting me know the part numbers. I will be back soon.

  • Greg Stokes
    Greg Stokes Nov 13, 2007

    Hi Oranzky,



    You nailed it man. These Transistors work in pairs. 2SA1386 and 2SC3519 are complimenting pairs. Used in 105W audio amplification. Be sure you make a diagram of where these are placed, so you get the placement correct.



    MCM Electronics has these at about $7 each.

    http://www.mcminone.com/product.asp?prod...

    You will see when this item pops up that a box on the right tells that other people also bought: You will see the 2SA1386. Keep me filled in on how your doing. Go ahead and check at Radio Shack to see if they have some. You might save some money.

  • Greg Stokes
    Greg Stokes Nov 14, 2007

    Hi Oranzky,



    2SC3519 and 2SA1386 are matching pairs. No 2SA3519 is made. The 2SC3519 has three legs. It is a transistor and all transistors have three legs. Both the 1386 and the 3519 have 3 legs. One is NPN and the other is PNP.

    I am going to see if I can find a schematic for your amp and figure out what that unnumbered transistor is. I am real curious about the small one in the middle.

  • Greg Stokes
    Greg Stokes Nov 14, 2007

    Hi Oranzky,



    Not trying to start an argument, but that picture is not the 2SC3519. I checked the data sheets and figured out the compliment between the 1386 and 3519. Go to the this URl to see the Datasheet.

    http://pdf1.alldatasheet.com/datasheet-p...

    If you buy from that website, you will need to call them and verify the picture is right or wrong, that is a much better price.

  • Greg Stokes
    Greg Stokes Nov 14, 2007

    The Sanken 2sc3519 also has 3 pins. The datasheet is for the Mospec 2sc3519.

  • Greg Stokes
    Greg Stokes Nov 14, 2007

    HI Oranzky,



    I could use a look at the Schematic. If you can Scan it Great. If not can you take a pic and save it as JPG. Then email it to Repairtech@PlayStationClinic.com . I will study it and see if there is a good way to troubleshoot the circuits to find exactly what is wrong. This way you may be able to save a load of money on parts.

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    Hi Oranzky,



    Thank you for sending the Schematic. Alright, The best advice I can give you is to check out the Overload indicating circuit first. It would be bad to replace a bunch of good transistors if you have two little Zener Diodes that are bad. You need to check to see if Z103 for being shorted. You put your meter on ohms, it should read between 5 and 40 ohms one way and over 1000 ohms with your leads swapped. If it reads low near 0 ohms both ways, it is shorted and the casue of the problem. When I say both ways , I mean changing your meter probes, put the red lead where the black lead was, and so forth. The Diode has only 2 wires, one coming out each end.

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    Since you have 4 channels working, lets use hem to get a reference for what a Good circuit read in resistance. The Transistors have three leads called the Base, Emitter, and collector. When looking at the schematic, the line coming into the center of the fat line is the base, The collector is the line coming in at an angle to the other side of the fat line with no arrow on it. The emmitter is the angle line that has an arrow. I think the 2SC3519 and 2SA1386 have markings to which lead is which. B,C, and E.



    Check Transistors:


    1. Check the transistor on a good channel first and record the values.

    2. Check the same Transistor in the bad channel section, and record the values.

    3. Set you meter to OHM's and place the red lead on BASE and Black lead on the Emmitter. Call this BrEb

    4. Red lead to base, and Black lead to Collector, Call this BrCb

    5. Black lead on Base, Red Lead on Emitter, call it BbEr.

    6. Black lead on Base, Red lead on Collector, call it BbCr

    7. Red lead on Collector, Black lead on Emitter, call it CrEb

    8. Black lead Collector, REd lead Emitter, call it CbEr

    If you see a major difference on one or more of the trransistors in the bad channel, Remove the bad ones from the bad channels only for further testing

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    With the Transistor on their back and screw hole at the top from left to right Base, Collector, Emitter

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    Hi Oranzky,



    They have them at walmart in the auto section near the radio and cd players for like $10. I think Big lots has them for $10 with a transistor and diode checker built in. Also I think Autozone and Advance auto.

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    HI Oranzky,



    The schematic did not show the other Zener diodes. But look at Z103 I think it should be black with a silver stripe or two. or a an a symbol that looks like a stretched out Z. I do not see but 5 total zeners in the schematic for channel one. It does appear on the schematic that related parts are number like you are thinking so best guess is yes, it wll be Z403 and Z603, and compare what you read on the other ones. The meter I am talking about is a Volt Ohm Meter or VOM.

  • Greg Stokes
    Greg Stokes Nov 15, 2007

    The Z's are ok then. Sounds like you do not have a problem with the Amplifiers. Unless you can see a difference in the resistance you read with them in the circuit as compared to a working circuit, you probably do not need to replace the Transistors or unsolder them. Check the resistance from R138, 238, 338... to Chassis ground. What do you see there? Your Getting Overload all the time,so the sensing circuit may be lying to us. Check Q121, Q122, Q123 and Q124 if you can. you know what i mean,Q223, Q323, Q423 and so on.

  • Greg Stokes
    Greg Stokes Nov 16, 2007

    Hi Oran,



    The problem you have is related to overload so it will read low value resistance as in 0.01 to 1000 ohms. I am really intersted to know exactly what the resistance is from R438, and R638 on channel 4 to Ground or chassis. This will tell me if we have a shorted out Speaker output on Channels 4 and 6. look at the other R138 238, 338 and so forth as well. Do not worry about the Q too much right now.

  • Greg Stokes
    Greg Stokes Nov 16, 2007

    Hi Oran,



    It is important to record your resistance Values so that we can see even the slightest difference. All of the channels are supposed to be the same. So if you find one that is 10 ohms different is could make a difference. This is the hard part about diagnosing the circuits and not unsoldering them. I am trying to go at this in an analytical way to find the root cause of the overload. The Q's( transistors) I mentioned above have a lot to do with the overload LED's. I am sure since you have this high performance Amp you know something about ohms. Speakers come in diffrent Ohm values. 2, 4, and 8 ohm. So you can see a little bit of difference in the speaker area with ohms can make diffrence.

  • Greg Stokes
    Greg Stokes Nov 17, 2007

    Hi Oran,



    Yes this makes sense. Your Reading rose higher due to the Capacitor C118. When you read a capacitor the ohms reading will rise. C118 is between R138 and Ground. Basically you were reading the resistor and capacitor at he same time. This is not wrong. It is late and I have been repairing Playstations all night. My Brain is not working too good right now. I am sorry. I was thinking today, that you may want to go ahead and replace one set of Amplifier in Channel 4. My thought was that really the only thing that is under strain is those amplifiers. Pull/ unsolder the amplifiers out of Channel 4.

    Unsoldered Amplifier test procedure:

    B = Base1, C=Collector2, E=Emitter3, r=red lead on your meter plugged into + hole. b=black lead plugged into the neg hole.

    When I write BrEb, I mean for you to place your red lead on the Base, and Black lead on the Emitter.

    Set your meter to 20K range. We probably will not be reading any higher than 20000 ohms.



    For the 2SC3519, they are NPN Transistors.

    BrEb should read less than 200 but more than 10.

    BrCb should read less than 50 but more than 10.

    BbEr should read around 1000 ohms.

    BbCr should be more than 1000 ohms.



    For the 2SA1386. PNP transistor

    BbEr about 30 ohms

    BbCr about 30 ohms

    BrEb over 1000 ohms.

    BrCb over 1000ohms

    CbEr over 1000 ohms

  • Greg Stokes
    Greg Stokes Nov 19, 2007

    Hi Oran,



    Looks like we hit Gold. I believe you 1386 Amps are burned out. They are not shorted , but Burned in two or open circuit. Alright lets go for replacing all the 1386 and 3519 amps in Channel 4 and 6. Also if you can talk to your supplier about getting you the transistors from the same lot numbers. This way you will match what Parasound did when they built your Amp.

  • Greg Stokes
    Greg Stokes Nov 19, 2007

    Hi Oran,



    I think the non marked Transistor between the 1386 and 3519 is Q112 and is a 2SC2240. You will also need to get some Heat Transfer Compound at Radio Shack. It is the White Paste that goes between the transistor and the metal heat sink.

  • Greg Stokes
    Greg Stokes Nov 19, 2007

    HI ORan,



    Your Right, it is 2SC3421 and I see it on the schematic as what looks like D111, but I think it is Q111...

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