Sennheiser Ew100/G2 Wireless Mic Receiver

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  • falcontech
    Badcaps Veteran
    • Oct 2013
    • 470
    • italy

    #1

    Sennheiser Ew100/G2 Wireless Mic Receiver

    hello everyone I have a problem with the receiver of this microphone which is a sennheiser ew100 / G2, attached the photo of the main board and the service manual of the receiver, and I'll put the youtube link for the video of the problem I don't know if it is a power problem, for the moment I realized that the power supply should bring out 13VDC but almost 19 come out, it is not a display problem, because when it starts doing this problem (after a few seconds) the transmitter stops working. I await your advice thank you
    Attached Files
  • falcontech
    Badcaps Veteran
    • Oct 2013
    • 470
    • italy

    #2
    Re: Sennheiser Ew100/G2 Wireless Mic Receiver

    https://www.youtube.com/watch?v=b8fOD7irM-I

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Sennheiser Ew100/G2 Wireless Mic Receiver

      Originally posted by falcontech
      hello everyone I have a problem with the receiver of this microphone which is a sennheiser ew100 / G2, attached the photo of the main board and the service manual of the receiver, and I'll put the youtube link for the video of the problem I don't know if it is a power problem, for the moment I realized that the power supply should bring out 13VDC but almost 19 come out, it is not a display problem, because when it starts doing this problem (after a few seconds) the transmitter stops working. I await your advice thank you
      So your AC adapter is putting out 19VDC instead of 13V?
      The service manual page 5 shows DC input jack rating of 10.5 ~ 16V 200mA, nominal is 12V.
      Show us the pictures of the AC adapter you are using.
      Last edited by budm; 07-27-2020, 10:52 PM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • falcontech
        Badcaps Veteran
        • Oct 2013
        • 470
        • italy

        #4
        Re: Sennheiser Ew100/G2 Wireless Mic Receiver

        in a while I attach the photo, however it is the original of the sennheiser NT2, I tried with another power supply but the problem remains, surely some component is gone and I thought about the voltage regulator 78m08

        Comment

        • falcontech
          Badcaps Veteran
          • Oct 2013
          • 470
          • italy

          #5
          Re: Sennheiser Ew100/G2 Wireless Mic Receiver

          here are the pictures
          Attached Files

          Comment

          • stj
            Great Sage 齊天大聖
            • Dec 2009
            • 31003
            • Albion

            #6
            Re: Sennheiser Ew100/G2 Wireless Mic Receiver

            can you open that, or is it glued shut?

            Comment

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4426
              • United Kingdom

              #7
              Re: Sennheiser Ew100/G2 Wireless Mic Receiver

              might need a load on it

              Comment

              • falcontech
                Badcaps Veteran
                • Oct 2013
                • 470
                • italy

                #8
                Re: Ricevitore microfono wireless Sennheiser Ew100/G2

                Originally posted by stj
                can you open that, or is it glued shut?
                it can be opened but at the moment the power supply is not the problem, because it will be replaced, but the receiver that gives that problem, look at the video that I put on youtube

                Comment

                • falcontech
                  Badcaps Veteran
                  • Oct 2013
                  • 470
                  • italy

                  #9
                  Re: Ricevitore microfono wireless Sennheiser Ew100/G2

                  Originally posted by petehall347
                  might need a load on it
                  I understand what you mean, tomorrow I will test with the receiver on

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                    It is not regulated power supply so the output will be higher than 13V without load, it will be 13V with 250mA load.
                    What Voltage do you get at the dc jack when the unit is turned on?
                    There are many power supplies on that receiver unit, look at page 14, 15, 19, 20 of the service manual, it shows you the Voltage test points that you need to check. Did you check them?
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • falcontech
                      Badcaps Veteran
                      • Oct 2013
                      • 470
                      • italy

                      #11
                      Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                      I test what you asked for and I will let you know

                      Comment

                      • falcontech
                        Badcaps Veteran
                        • Oct 2013
                        • 470
                        • italy

                        #12
                        Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                        I disassembled the 78m08 voltage regulator, and I am waiting for the new one to be replaced to replace it, I keep you updated

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                          Originally posted by falcontech
                          I disassembled the 78m08 voltage regulator, and I am waiting for the new one to be replaced to replace it, I keep you updated
                          What are the input and output Voltages you are getting on this +8V regulator?
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment

                          • falcontech
                            Badcaps Veteran
                            • Oct 2013
                            • 470
                            • italy

                            #14
                            Re: Ricevitore microfono wireless Sennheiser Ew100/G2

                            Originally posted by budm
                            What are the input and output Voltages you are getting on this +8V regulator?
                            I'm waiting for you to come to assemble it and then I'll tell you, with what I took apart I only remember the output voltage which was about 6 volts

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                              You should be able to test the input and output Voltage easily, you should also check the resistance of the output to see if it shows very low Ohms or not, nothing special or hard about doing simple test.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • falcontech
                                Badcaps Veteran
                                • Oct 2013
                                • 470
                                • italy

                                #16
                                Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                                I tested the voltages, I realized that at the input of this resettable fuse I have 16 volts at the input and then at the output I have 8.5 volts do you think this could be the problem?
                                Attached Files

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                                  Originally posted by falcontech
                                  I tested the voltages, I realized that at the input of this resettable fuse I have 16 volts at the input and then at the output I have 8.5 volts do you think this could be the problem?
                                  What is the P/N printed on it, I see XD75????, 24V
                                  Unplug the DC jack and let the fuse cool down then check the resistance of the fuse.
                                  Also check the resistance of that black cylinder device connected to that fuse also.
                                  Last edited by budm; 08-05-2020, 03:54 PM.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • falcontech
                                    Badcaps Veteran
                                    • Oct 2013
                                    • 470
                                    • italy

                                    #18
                                    Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                                    on the fuse the acronym is x075f 24v, that cylindrical part I did not understand what component it is if you can give me a hand through service manual I would be grateful

                                    Comment

                                    • R_J
                                      Badcaps Legend
                                      • Jun 2012
                                      • 9535
                                      • Canada

                                      #19
                                      Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                                      The cylindrical part is likely D210 SM4007, polarity protection diode

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Sennheiser Ew100/G2 Wireless Mic Receiver

                                        [QUOTE=falcontech;979358]on the fuse the acronym is x075f 24v, that cylindrical part I did not understand what component it is if you can give me a hand through service manual I would be grateful[/QUOTE]
                                        1) That black component is a protection diode D210 (SM4007) in case the unit is connected to the wrong polarity of the AC/DC adapter. So check the RESISTANCE as I requested.

                                        2) Fuse F210 (X075F 24V) is rated at 0.75A per schematic. Did you check the resistance (no power applied to the unit for at least 10 minutes) as I requested?

                                        3) You must follow my instructions when I request you to do the measurement otherwise we are just wasting times here.
                                        Attached Files
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

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