Vz-2000 Sound issues

I

ImCharming

New Member
Superduper said:
Ah, OK, so I understand the confusion now. From what I can see, in this case, the MIX-OUT is basically just an AUX-OUT or LINE-OUT. Take a look at this block diagram and you can see that the mix-out is essentially split between line signal to the amplifier, mix-out, and rec-level, which is a very conventional structure. Just a labeling difference from what I can see. Click on the image to expand it for clearer view.

View attachment 58828
Click to expand...
Okay, just to give everyone an update on what I have done so we can somewhat be on the same page.

Have done
  1. Cleaned all boards, ports, plugs,
  2. Checked for any faulty caps / solder / cables
  3. Tested with Record player disconnected
  4. Tested with tape deck disconnected
  5. Tested external speakers in (R/L)
  6. Tested external speakers in Aux in (R/L) and Mix out (R/L) I am getting no play back out of either.
  7. Tested with internal speakers
  8. Tested FM / AM / Phono / Tape (all work and function with music just fine when the audio decides to be nice)
Have not
  1. Test the front headphone jack. Currently waiting on a jack to be able to test.
After doing all this and testing each part to try and isolate the issue it seems now the issue has slightly changed. Now keep in mind I did this every single time when disconnecting a different part of the VZ2000 and it was the same issue for each. It will make the really loud distorted sound really quickly then nothing coming through the speakers besides a low hum. The hum will then go away and audio will kick in from what ever option I have selected and run fine. If I turn it off and turn it back on again it will run just fine, no loud crazy noises, no low hum, just straight to music again. If I turn it off for a little while and fire it back up it will repeat the loud noise, then hum with some crackling, then straight to music. Almost like it is charging up before being able to function.
And once again SuperDuper I appreciate you a bunch with giving me some in depth walk through. I am not familiar with a lot of terminology in this world of things but I am a quick learner and fairly tech savvy so google has been my friend. Still working on what you have suggested but just wanted to give a check list out of things I have done and eliminated
 
Superduper

Superduper

Moderator
Staff member
ImCharming said:
Okay, just to give everyone an update on what I have done so we can somewhat be on the same page.

Have done
  1. Cleaned all boards, ports, plugs,
  2. Checked for any faulty caps / solder / cables
  3. Tested with Record player disconnected
  4. Tested with tape deck disconnected
  5. Tested external speakers in (R/L)
  6. Tested external speakers in Aux in (R/L) and Mix out (R/L) I am getting no play back out of either.
  7. Tested with internal speakers
  8. Tested FM / AM / Phono / Tape (all work and function with music just fine when the audio decides to be nice)
Have not
  1. Test the front headphone jack. Currently waiting on a jack to be able to test.
After doing all this and testing each part to try and isolate the issue it seems now the issue has slightly changed. Now keep in mind I did this every single time when disconnecting a different part of the VZ2000 and it was the same issue for each. It will make the really loud distorted sound really quickly then nothing coming through the speakers besides a low hum. The hum will then go away and audio will kick in from what ever option I have selected and run fine. If I turn it off and turn it back on again it will run just fine, no loud crazy noises, no low hum, just straight to music again. If I turn it off for a little while and fire it back up it will repeat the loud noise, then hum with some crackling, then straight to music. Almost like it is charging up before being able to function.
And once again SuperDuper I appreciate you a bunch with giving me some in depth walk through. I am not familiar with a lot of terminology in this world of things but I am a quick learner and fairly tech savvy so google has been my friend. Still working on what you have suggested but just wanted to give a check list out of things I have done and eliminated
Click to expand...


Have done
  1. Cleaned all boards, ports, plugs, Fair Enough.
  2. Checked for any faulty caps / solder / cables Ok, But what does that mean? How did you check for faulty caps, there are probably 150 to 200 of them. A visual examination only? From experience, most bad capacitors I've found have had zero external indications of damage. You simply can not determine component condition by their appearance.
  3. Tested with Record player disconnected.
  4. Tested with tape deck disconnected
  5. Tested external speakers in (R/L) And what was the result? I'll ask you again, did you determine if the oscillation is present in all 4 speakers or just one side, or just the woofers and not the tweeters, or just the tweeters and not the woofers, or what? When we ask you to check something, we are usually waiting for the results so we can consider the result and maybe offer additional followups.
  6. Tested external speakers in Aux in (R/L) and Mix out (R/L) I am getting no play back out of either. First of all, I'm not understanding what you are doing here. Are you saying you connected external speakers to these jacks and expected sound output? Because there would be no value to such a test. The aux-in jack is for you to playback an external audio source through your VZ. In other words, you use these to import an external line-ouptut audio signal like from a cassette deck, walkman, mp3 player, CD player, tuner, and your VZ should playback that audio if the aux mode is selected. The Aux-in jacks are not intended to be connected to a "load", it is expecting an external audio source signal. As for the Mix-out jacks, adding external speakers to those jacks, (if you had such an rca to speaker cable adapter) will only result in nothing, since it's a high impedance line level signal (i.e., 10,000 ohm), not intended for a low impedance load (i.e. 8 ohms) like external speakers. The best you can probably hope for is a whisper, or likely nothing at all since the preamp level mix-out signal would simply be overloaded. What I and Caution was advising as a test was to port the mix-out jacks into another audio device's (home stereo, another boombox, etc.) line-in jacks and see if you can hear the VZ source signal being played back in the external audio device.
  7. Tested with internal speakers Since you already had output through those speakers, we already know the internal speakers are functioning fine and speakers themselves would not be the source of oscillation.
  8. Tested FM / AM / Phono / Tape (all work and function with music just fine when the audio decides to be nice) Ok, you know that the internal audio sources are fine. Caution gave you good advice. This is the 2nd time that I'd suggest you follow his advice, maybe just change the caps hanging off the amps and see what happens.
 
I

ImCharming

New Member
Superduper said:
Have done
  1. Cleaned all boards, ports, plugs, Fair Enough.
  2. Checked for any faulty caps / solder / cables Ok, But what does that mean? How did you check for faulty caps, there are probably 150 to 200 of them. A visual examination only? From experience, most bad capacitors I've found have had zero external indications of damage. You simply can not determine component condition by their appearance. Yes it was visual, I understand that capacitors can be bad without showing external signs. I have just followed other folks advice from boomboxery's different threads and other help websites to just check visually if anything has become disconnected, bloated, or corroded.
  3. Tested with Record player disconnected.
  4. Tested with tape deck disconnected
  5. Tested external speakers in (R/L) And what was the result? I'll ask you again, did you determine if the oscillation is present in all 4 speakers or just one side, or just the woofers and not the tweeters, or just the tweeters and not the woofers, or what? When we ask you to check something, we are usually waiting for the results so we can consider the result and maybe offer additional followups. It has been all 4 speakers ( including both sides, woofers, and tweeters. I have tested each speaker independently (R/L) with the same results I have spoke about before. Loud surging sounds coming from the tweeters and woofer. This is the same issue I get with the Internal speakers, tested both independently (R/L) also with the same results
  6. Tested external speakers in Aux in (R/L) and Mix out (R/L) I am getting no play back out of either. First of all, I'm not understanding what you are doing here. Are you saying you connected external speakers to these jacks and expected sound output? Because there would be no value to such a test. The aux-in jack is for you to playback an external audio source through your VZ. In other words, you use these to import an external line-ouptut audio signal like from a cassette deck, walkman, mp3 player, CD player, tuner, and your VZ should playback that audio if the aux mode is selected. The Aux-in jacks are not intended to be connected to a "load", it is expecting an external audio source signal. As for the Mix-out jacks, adding external speakers to those jacks, (if you had such an rca to speaker cable adapter) will only result in nothing, since it's a high impedance line level signal (i.e., 10,000 ohm), not intended for a low impedance load (i.e. 8 ohms) like external speakers. The best you can probably hope for is a whisper, or likely nothing at all since the preamp level mix-out signal would simply be overloaded. What I and Caution was advising as a test was to port the mix-out jacks into another audio device's (home stereo, another boombox, etc.) line-in jacks and see if you can hear the VZ source signal being played back in the external audio device. Sorry, I did word this really stupid like, The Aux in will play from an external audio source but whenever firing up the VZ the loud surging noise still happens. I Have also tested with the Headphone jack and it function as it should but still the noise. Mix out jack also does the same thing, I get VZ source signal but the loud noises when powering up the VZ comes through.
  7. Tested with internal speakers Since you already had output through those speakers, we already know the internal speakers are functioning fine and speakers themselves would not be the source of oscillation. Just wanted to list what I have checked.
  8. Tested FM / AM / Phono / Tape (all work and function with music just fine when the audio decides to be nice) Ok, you know that the internal audio sources are fine. Caution gave you good advice. This is the 2nd time that I'd suggest you follow his advice, maybe just change the caps hanging off the amps and see what happens. That is one reason why I did a visual check because when I heard the word "hanging" I figured they discovered a cap that the solder break and was literally hanging on by one pin.
Click to expand...

I have replied next to your replies in the quote. Like I have said, I am trying to eliminate small things before jumping into cap overhaul. It the more things I have tested its looking to be that way. I appreciate Y'all and I understand this is probably frustrating, makes it difficult talking on a forum.
 
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