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HIFONICS ZXi 1008 car amp has output on one channel only

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    #41
    Re: HIFONICS ZXi 1008 car amp has output on one channel only

    Originally posted by tfs2015 View Post
    Rectifiers are out amp is out of protect mode. When I try to put any one of the four rectifiers back into the circuit the amp goes into protect mode again. What would cause this and what do I need to check? Rectifiers tested fine so now where do I check?

    Any and all help would be greatly appreciated on this.

    Thanks
    Tom S.
    You may have shorted rectifiers.
    Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

    My computer doubles as a space heater.

    Permanently Retired Systems:
    RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
    Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


    Kooky and Kool Systems
    - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
    - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
    - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
    - Main Workstation - Fully operational!

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      #42
      Re: HIFONICS ZXi 1008 car amp has output on one channel only

      check rectifiers out of circuit they are not shorted and show the correct voltage drop of about .406 V DC. I am under the assumption that this is the correct voltage drop for these?

      These rectifiers are HERF1004G and HERF1004GA. However I can't find a replacement for them. Here is the datasheet that I have on them.
      Attached Files
      Computer and Small electronics troubleshooting and repair

      Comment

        #43
        Re: HIFONICS ZXi 1008 car amp has output on one channel only

        Tested the rectifiers, with the center legs out of circuit, and I get +45vdc and -45vdc out of them so I guess that means that the rectifiers are good and so the power supply FET's are good. When I hook the center legs up to the circuit that is when it goes into protect.
        Computer and Small electronics troubleshooting and repair

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          #44
          Re: HIFONICS ZXi 1008 car amp has output on one channel only

          Check everything downstream of the 2 center pins.
          Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

          My computer doubles as a space heater.

          Permanently Retired Systems:
          RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
          Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


          Kooky and Kool Systems
          - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
          - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
          - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
          - Main Workstation - Fully operational!

          sigpic

          Comment

            #45
            Re: HIFONICS ZXi 1008 car amp has output on one channel only

            I got a question regarding the designation of pin 1 on the circuit board. Is it usually a square shaped pad and the other are round or is that not standard?
            Computer and Small electronics troubleshooting and repair

            Comment

              #46
              Re: HIFONICS ZXi 1008 car amp has output on one channel only

              I don't know. Maybe those are + and - terminals. Photo please? Thanks.
              Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

              My computer doubles as a space heater.

              Permanently Retired Systems:
              RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
              Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


              Kooky and Kool Systems
              - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
              - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
              - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
              - Main Workstation - Fully operational!

              sigpic

              Comment

                #47
                Re: HIFONICS ZXi 1008 car amp has output on one channel only

                since this amp has two transformers one for each channel I have pulled all of the rectifiers and mosfets out of the one channel and all of the ouputs and driver transistors are out as well on both channels however it is still going into protect. Do I need to pull the transformer on the channel that all of the ouputs are not installed in to see if it will come out of protect, in effect having only one channel operational?
                Computer and Small electronics troubleshooting and repair

                Comment

                  #48
                  Re: HIFONICS ZXi 1008 car amp has output on one channel only

                  Found a DC offset on one of the speaker terminals how can I fix that? Goes from 1vdc to 3vdc before the protect circuit kicks in.

                  Thanks
                  Tom
                  Computer and Small electronics troubleshooting and repair

                  Comment

                    #49
                    Re: HIFONICS ZXi 1008 car amp has output on one channel only

                    The op amps tested OK, and I have found the reason for the offset and fixed it. The problem that I am having now has to do with the audio signal going from the op amps outputs into the current voltage gain stage. I don't understand where the signal is entering that stage. If anyone could help me with that it would be greatly appreciated.

                    Thanks
                    Tom
                    Computer and Small electronics troubleshooting and repair

                    Comment

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