Yamaha CR-620 | POP! And no sound...

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Ritalin
    Senior Member
    • Sep 2010
    • 194
    #1

    Yamaha CR-620 | POP! And no sound...

    Picked this amp up for free off craigslist and they said they heard a pop and now the whole control was dead. I did some tracing and came to this part and then the trail ended there, so I think this is the problem maker. The part is so old that I can't find much about it. HELP!
    Attached Files
    Tags: None
    • redwire
      Badcaps Legend
      • Dec 2010
      • 3900
      • Canada
      #2
      Re: Yamaha CR-620 | POP! And no sound...

      That's a transistor 2SD234, probably used as a voltage regulator in the amp. 60V 3A B=40-240. Many substitutes like TIP41A, MJE3055T, TIP31A is lower gain.

      But you still have to find out what went pop. How are the capacitors and other transistors looking? Unless the pop was heard in the speakers.

        Comment

        • Ritalin
          Senior Member
          • Sep 2010
          • 194
          #3
          Re: Yamaha CR-620 | POP! And no sound...

          Caps and transistors look alright, when I disconnect a portion of it I get all the right voltages coming out, but as soon as I reconnect, I lose about half the voltages.

            Comment

            • Ritalin
              Senior Member
              • Sep 2010
              • 194
              #4
              Re: Yamaha CR-620 | POP! And no sound...

              And I might have a TIP31A, is that alright to put in, or should I order a better part?

                Comment

                • Ritalin
                  Senior Member
                  • Sep 2010
                  • 194
                  #5
                  Re: Yamaha CR-620 | POP! And no sound...

                  NVM... all I have is TIP31... which I'm sure won't work....

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Yamaha CR-620 | POP! And no sound...

                      It sounds to me you have bad circuit some where that draw too much current and cause the voltage drop, this transistor is set up as a linear regulator which is in series with the load.
                      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

                        • redwire
                          Badcaps Legend
                          • Dec 2010
                          • 3900
                          • Canada
                          #7
                          Re: Yamaha CR-620 | POP! And no sound...

                          Budm, thanks for digging for the schematic
                          Ritalin I think you are off track. TR802 is the +30V regulator for the preamp stuff (phono preamp, tone controls) and it also gives bias to the power amp diff amp. But nothing I could see would load it down' it does not drive anything without big resistors. If the vreg is overloaded, it would get real hot and burn up.
                          You can try a tip31 i think it would work. make sure the Zener is ok giving 29v to the base.
                          If you have some voltage measurements that helps

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • jjne
                              Yamaha RX V675 sound issues
                              by jjne
                              I have an old Yamaha RX V675 receiver which is starting to develop issues with the sound, although it doesn't quite match up with what folk normally report with these.

                              From cold, the sound cuts in and out. When this happens the amp is losing sync with the optical input (speaker graphic disappears from the front panel). But this is not resolved by putting the unit into pure direct mode. After a couple of minutes this resolves, although there are occasional clicks from the speakers after that.

                              At first I thought it was either a speaker relay or the DSP, but I don't think...
                              Yesterday, 07:01 AM
                            • AlexVG
                              YAMAHA CLP-550 without of sound
                              by AlexVG
                              Hi.
                              I have an old YAMAHA CLP-550 without sound. (Some times I can get some kind of noise or distorted sound)
                              I have replaced all green marked elements, but it gave me nothing.
                              The IC12 chip LC9116A-105 (red marked) remains under suspicion yet.

                              But it is custom YAMAHA's chip, and I can't find any information about it.
                              Maybe somebody came across with the same issue?
                              Any information will be very useful. I will be very appreciated.
                              Thank you....
                              06-08-2025, 09:29 AM
                            • ChaosLegionnaire
                              what i went through dealing with my mobo with dead onboard sound!
                              by ChaosLegionnaire
                              so i took out one of my spare gigabyte ep35-ds3r mobos from storage for use to do some cpu, ram and video card testing of stuff i bought from ebay and got for free from momaka. he bought 50 e8400 cpus for cheap from ebay some years ago and i decided to help him relieve him of some of his supply since he had waaaay too many!! what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol!

                              i had to blow some dust off the board and heatsinks with the datavac as i didnt clean it up before putting it in storage. after finishing...
                              09-13-2022, 09:02 AM
                            • maleksa
                              Yamaha MOX8 boot freeze and distorted sound
                              by maleksa
                              My Yamaha MOX8 synthesizer recently developed two issues.

                              Firstly, after booting up, it operates as normal. However, after about 5 minutes, the sound starts to get distorted (broken up screeching sound) almost like putting it through a guitar distortion pedal. After a while, the distorted sounds will go away for a while and comes back. At times, the synthesizer will also freeze I need to power off and on again.

                              Secondly, when powering off and on again, there will be times where the synthesizer will freeze during the boot sequence (freezes at the MOX8 Opening Screen),...
                              11-07-2024, 03:28 AM
                            • Rupsenkind
                              Yamaha RX-A1030 working, no sound output
                              by Rupsenkind
                              Hi all, I've started this new thread in order to avoid further polution of thread "Yamaha RX-A3010 working, no sound output"
                              Just to recap:

                              No sound through Audio and AV analogue inputs, only sound when 2ch stereo or pure direct is activated (so no sound when I e.g. choose 7ch of Hall in Munich etc.). Hoever when I connect HDMI I've sound in all options (movie, music, eyc.) First suspicion was the DSP chip/PCB so I bought a scrap 1030 with a good functioning PCB (in this one a driver stage was defective (PRT DC: 67), after I swapped the PCB I've performed a factory...
                              07-10-2022, 03:15 AM
                            • Loading...
                            • No more items.
                            Working...