Is this resistor toast?

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  • mikay786
    Badcaps Veteran
    • Aug 2014
    • 765
    • UK

    #1

    Is this resistor toast?

    Is the below resistor toast? I had my brother in law look at cb radio as he's into them and he says it is just a dummy resistor and its normal.

    But looking at it, it looks badly charred, don't want to mess with it if its ok and looks a pain to remove board and the radio works fine.
    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30985
    • Albion

    #2
    Re: Is this resistor toast?

    that's done.
    what make / model radio is it?

    Comment

    • mikay786
      Badcaps Veteran
      • Aug 2014
      • 765
      • UK

      #3
      Re: Is this resistor toast?

      found a pic of resistor

      blue grey gold gold

      can I measure it in circuit board?
      Attached Files

      Comment

      • mikay786
        Badcaps Veteran
        • Aug 2014
        • 765
        • UK

        #4
        Re: Is this resistor toast?

        Yaesu FT-290R MK2

        Comment

        • SteveNielsen
          Retired Tech
          • Jun 2012
          • 2327
          • USA

          #5
          Re: Is this resistor toast?

          I've seen toasted resistors like that still be within tolerance and keep working but it raises the question of why did it overheat like that in the first place. Look for THAT problem. It needs to be replaced regardless but it is not a dummy load resistor, it's only a 1/2 watt.

          Comment

          • mikay786
            Badcaps Veteran
            • Aug 2014
            • 765
            • UK

            #6
            Re: Is this resistor toast?

            Is it possible to measure inline?

            Comment

            • goontron
              5000!
              • Dec 2011
              • 4108
              • US

              #7
              Re: Is this resistor toast?

              Originally posted by SteveNielsen
              I've seen toasted resistors like that still be within tolerance and keep working but it raises the question of why did it overheat like that in the first place. Look for THAT problem. It needs to be replaced regardless but it is not a dummy load resistor, it's only a 1/2 watt.
              dummy load on a CB, the antenna did not have a proper loading coil would be my guess.
              Last edited by goontron; 10-12-2015, 10:48 AM.
              Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

              "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

              Excuse me while i do something dangerous


              You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

              Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

              Follow the white rabbit.

              Comment

              • stj
                Great Sage 齊天大聖
                • Dec 2009
                • 30985
                • Albion

                #8
                Re: Is this resistor toast?

                6.8ohm 5% probably about 1w and it should be non-inductive.

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30985
                  • Albion

                  #9
                  Re: Is this resistor toast?

                  top-left on the 3rd schem.
                  6.8ohm .5w
                  Attached Files

                  Comment

                  • mikay786
                    Badcaps Veteran
                    • Aug 2014
                    • 765
                    • UK

                    #10
                    Re: Is this resistor toast?

                    Thanks STJ, I'm probably just going to leave it as the unit is functioning perfectly. My brother in law used for about a week with no issues.

                    Its a bit outside my comfort zone, replacing it isn't an issue but taking the unit apart and putting it back together.

                    Comment

                    • goontron
                      5000!
                      • Dec 2011
                      • 4108
                      • US

                      #11
                      Re: Is this resistor toast?

                      Originally posted by mikay786
                      Thanks STJ, I'm probably just going to leave it as the unit is functioning perfectly. My brother in law used for about a week with no issues.

                      Its a bit outside my comfort zone, replacing it isn't an issue but taking the unit apart and putting it back together.
                      what frequency is the CB band in the UK? Same as the US (11m)?
                      Last edited by goontron; 10-12-2015, 04:03 PM.
                      Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

                      "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

                      Excuse me while i do something dangerous


                      You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

                      Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

                      Follow the white rabbit.

                      Comment

                      • mikay786
                        Badcaps Veteran
                        • Aug 2014
                        • 765
                        • UK

                        #12
                        Re: Is this resistor toast?

                        Originally posted by goontron
                        what frequency is the CB band in the UK? Same as the US (11m)?
                        2m

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 30985
                          • Albion

                          #13
                          Re: Is this resistor toast?

                          depends if you mean the legal one!

                          there are actually about 4.
                          and they arent 2m - that's a HAM band.

                          Comment

                          • stj
                            Great Sage 齊天大聖
                            • Dec 2009
                            • 30985
                            • Albion

                            #14
                            Re: Is this resistor toast?

                            http://ukspec.tripod.com/rf/handheld.html

                            one thing you wont see mentioned,
                            a lot of people in Europe are (mis)using the PMR band using modified radio's or ham radio's to transmit 16 channels of 5w power on the 8 channel 500mw band!

                            Comment

                            • SteveNielsen
                              Retired Tech
                              • Jun 2012
                              • 2327
                              • USA

                              #15
                              Re: Is this resistor toast?

                              It's on the 4th schematic, not the 3rd, and it is not a dummy load resistor. It is inline with +13.8v supply. Something shorted. Possibly a cap downstream connected to chassis gnd shorted then opened internally, like c34. The radio would probably still work without c34 but probably noisier audio and/or less stable than with it since that's audio output section.

                              Comment

                              • mikay786
                                Badcaps Veteran
                                • Aug 2014
                                • 765
                                • UK

                                #16
                                Re: Is this resistor toast?

                                Originally posted by SteveNielsen
                                It's on the 4th schematic, not the 3rd, and it is not a dummy load resistor. It is inline with +13.8v supply. Something shorted. Possibly a cap downstream connected to chassis gnd shorted then opened internally, like c34. The radio would probably still work without c34 but probably noisier audio and/or less stable than with it since that's audio output section.
                                I know it should be changed but my brother in law told me to leave it alone. If it ain't broke, don't fix it he says. Anyhow will see, just working on that Sony HiFi at moment.

                                Comment

                                • rhomanski
                                  nowhere man
                                  • Dec 2009
                                  • 5157
                                  • U S of A

                                  #17
                                  Re: Is this resistor toast?

                                  Is my toast resistive?
                                  sigpicThe Sky Is Falling

                                  Comment

                                  • goontron
                                    5000!
                                    • Dec 2011
                                    • 4108
                                    • US

                                    #18
                                    Re: Is this resistor toast?

                                    Originally posted by rhomanski
                                    Is my toast resistive?
                                    i don't know about yours, but mine is. I like a nice layer of carbon on the outside
                                    Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

                                    "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

                                    Excuse me while i do something dangerous


                                    You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

                                    Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

                                    Follow the white rabbit.

                                    Comment

                                    • stj
                                      Great Sage 齊天大聖
                                      • Dec 2009
                                      • 30985
                                      • Albion

                                      #19
                                      Re: Is this resistor toast?

                                      if you burn it enough it will be!

                                      Comment

                                      • rhomanski
                                        nowhere man
                                        • Dec 2009
                                        • 5157
                                        • U S of A

                                        #20
                                        Re: Is this resistor toast?

                                        Will the butter make it short?
                                        sigpicThe Sky Is Falling

                                        Comment

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