Harman Kardon AVR1700 won't power up

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  • tibimakai
    Badcaps Legend
    • Jan 2012
    • 3680
    • USA

    #101
    Re: Harman Kardon AVR1700 won't power up

    You are right, it can't be the probe, because the square wave is there when I test it.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #102
      Re: Harman Kardon AVR1700 won't power up

      So until I see how you have connected it I cannot advise further.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • tibimakai
        Badcaps Legend
        • Jan 2012
        • 3680
        • USA

        #103
        Re: Harman Kardon AVR1700 won't power up

        OK, here it is.
        I have measured the RCA end of the audio cable and I'm getting the same reading. Like an overlapped sine wave.
        Attached Files

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #104
          Re: Harman Kardon AVR1700 won't power up

          I don't think that connection is reliable enough. Can you try with a piece of wire connected to the screw terminal and the hook probe connected to the other end of the wire?
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • tibimakai
            Badcaps Legend
            • Jan 2012
            • 3680
            • USA

            #105
            Re: Harman Kardon AVR1700 won't power up

            I have just tried at work the same setup and it shows a nice sine wave.
            I have to check out again my home setup, what is wrong there.
            Yesterday, I have measured some of the transistors, basically comparing the ,measurements between channels and I have noticed some discrepancies.
            I guess I still have some bad component there.
            At of the A1360Y at he collector I have 0V and at the other channel, I have 1.1xxV.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #106
              Re: Harman Kardon AVR1700 won't power up

              Basically we need to get a view of how the waveform is distorted so we can figure out where the problem may be.
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • tibimakai
                Badcaps Legend
                • Jan 2012
                • 3680
                • USA

                #107
                Re: Harman Kardon AVR1700 won't power up

                OK, after fiddling with the scope for a while(I don't know why I have to play with it?), I have managed to see a sine wave.
                I don't have the option to save it in Bit file, only wfm and I can't attach those type of files here.
                I'll have to take pictures.

                Comment

                • tibimakai
                  Badcaps Legend
                  • Jan 2012
                  • 3680
                  • USA

                  #108
                  Re: Harman Kardon AVR1700 won't power up

                  I'm trying to add some links from Dropbox for the two files.
                  https://www.dropbox.com/s/bf43rpmfgtc5ol8/NewFile0.wfm
                  https://www.dropbox.com/s/t2rer0d8sg7y05y/NewFile1.wfm

                  I have installed the scope's software, but it takes some time until I will figure it out how to use it.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #109
                    Re: Harman Kardon AVR1700 won't power up

                    You need to select BMP format (Storage Button > Storage > Bit map) then press External to save. The WFM file is just raw data (X,Y coordinates to plot.) BMP is exactly what is on LCD.
                    Last edited by tom66; 06-20-2013, 03:02 AM.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • tibimakai
                      Badcaps Legend
                      • Jan 2012
                      • 3680
                      • USA

                      #110
                      Re: Harman Kardon AVR1700 won't power up

                      Unfortunately, I don't have that option. I have: Storage, External, New file and Save.

                      Comment

                      • tibimakai
                        Badcaps Legend
                        • Jan 2012
                        • 3680
                        • USA

                        #111
                        Re: Harman Kardon AVR1700 won't power up

                        I have installed a software called Ultra Sigma and that software will let me to print the screen, but I couldn't find the location where has saved the file.
                        I will look into it more later on today.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #112
                          Re: Harman Kardon AVR1700 won't power up

                          You don't need that.

                          Press STORAGE button.

                          Then press STORAGE on side menu to select the type used, select Bit Map.

                          Then press External and New File.

                          But if you can't figure it out just take photos of the screen.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                          • tibimakai
                            Badcaps Legend
                            • Jan 2012
                            • 3680
                            • USA

                            #113
                            Re: Harman Kardon AVR1700 won't power up

                            I have just looked up the manual and I have noticed that. In will try it out when I will be home. Thanks

                            Comment

                            • tibimakai
                              Badcaps Legend
                              • Jan 2012
                              • 3680
                              • USA

                              #114
                              Re: Harman Kardon AVR1700 won't power up

                              Finally I have managed to save them.
                              First one, is the good channel, second one is the bad channel with the same settings and the third one is still the bad channel, but I made it much more viewable.
                              Attached Files

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #115
                                Re: Harman Kardon AVR1700 won't power up

                                The bad channel is essentially silent then.

                                So, you said it sounded distorted. With a speaker connected to the output, you would say the output is very quiet, almost not there?
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                • tibimakai
                                  Badcaps Legend
                                  • Jan 2012
                                  • 3680
                                  • USA

                                  #116
                                  Re: Harman Kardon AVR1700 won't power up

                                  Yes, I have to be very close to the speakers.
                                  Today, I was measuring with the Ohm meter all the resistors and one of the 22K was showing 0.6 Ohm, but when I have removed the board, it was showing a correct value.
                                  How is that possible?
                                  I went through all the parts on that channel and I didn't find anything bad.
                                  To measure voltages it's very hard, because on top of the amp is the HDMI board.

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #117
                                    Re: Harman Kardon AVR1700 won't power up

                                    Where was the 22k? Can you highlight it in circuit?
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • tibimakai
                                      Badcaps Legend
                                      • Jan 2012
                                      • 3680
                                      • USA

                                      #118
                                      Re: Harman Kardon AVR1700 won't power up

                                      Here it is:

                                      It's late here, see you tomorrow.
                                      Attached Files

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #119
                                        Re: Harman Kardon AVR1700 won't power up

                                        Can't see any shorted transistor causing that.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

                                        • ben7
                                          Capaholic
                                          • Jan 2011
                                          • 4059
                                          • USA

                                          #120
                                          Re: Harman Kardon AVR1700 won't power up

                                          Checked for solder bridges?

                                          What is the resistance across R606?
                                          Muh-soggy-knee

                                          Comment

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