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New Ranger 39VHP—Low RX audio - almost none

Discussion in 'General CB Services Discussion' started by CbRadiosPRONTO, Apr 7, 2019.

  1. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    A new radio came in with low RX audio. Volume cranked, ear to speaker, then I can hear it. Rf gain level is up and signal meter responds as it should so the rf is there. The audio is just almost nonexistent.



    Note: TX and Talkback audio is fine.
     

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  2. 999

    999 Well-Known Member

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    What the hell is going on here? RCI 39 WTF.jpg
    It looks like that regulator was moved over to pass that wire through the board and they did some other "modifications" to make that happen. I would bet that is where your low audio RX issue is.
     
    #2 999, Apr 7, 2019
    Last edited: Apr 7, 2019
  3. Eldorado828

    Eldorado828 From the high plains of Texas

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    Wow there's no way it came that way from the assembly line I was hope! I second 999, that's most likely the issue!
     
  4. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    I did notice that. Strangely, the location where that 1st leg (closest to the front of the radio) normally solders to, still has a full 13+ volts. This radio is brand new out of the box from the factory. The picture was just to show which board it has since most people aren’t familiar with it. I thought it was strange but it has to be stock. However, I have another one in stock. I will open it up on Monday and see what that looks like.
     
    #4 CbRadiosPRONTO, Apr 7, 2019
    Last edited: Apr 8, 2019
  5. Eldorado828

    Eldorado828 From the high plains of Texas

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    Yeah it wouldn't surprise me as I've seen some strange solder pad and trace fixes out of new in the box radios. My favorite is when they throw a big blob of solder to rebuild a trace that was damaged during the component installation. Maybe in your case it's a broken trace and they tried to bypass it by going to the next component in the chain but they didn't nail it right.... No telling anymore coming from an ranger built radio... Sad to see that in time instead of having better qc it's only gotten worse. Maybe that radio was the last one of the day on Friday right before quiting time! Someone's care meter bounced of zero!
     
  6. nomadradio

    nomadradio Analog Retentive

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    First thing I would do is to unsolder the center pin (collector) of Q44, the squelch switch transistor. You don't have to remove the transistor, only enough of the solder to isolate the pin from the copper pad. If this restores the receiver audio it tells you there is an issue with the squelch circuit.

    Won't tell you what that issue is, but this narrows it down at least.

    73
     
    CbRadiosPRONTO and NZ8N like this.
  7. Chevboy0167

    Chevboy0167 Active Member

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    Maybe give that 455 filter a tap on top with a capped pen. Not very common failure point but I have seen it.
     
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  8. nomadradio

    nomadradio Analog Retentive

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    Trouble with the ceramic filter should hold the S-meter reading down.

    Pretty sure he's right about looking in the audio circuits for the trouble.

    A 'scope will let you follow the signal and see where it falls off the cliff.

    If you have one handy.

    But taking the squelch-switch transistors' collector out of circuit will at least point a finger at or away from the squelch circuit.

    Checking for a squelch "pop" in the speaker audio is a quicker way. If you hear the soft transient noise of the squelch opening and closing as the squelch knob is cranked end-to-end that would suggest the squelch circuit is not stuck.

    73
     
    NZ8N likes this.
  9. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    Hopefully, I’ll have time to check it out today (Monday). I’ve got several radios to get out and I’ll get at it.
     
  10. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    *********************************************

    BRAIN FART ALERT

    *********************************************

    When posting this, I retrieved a picture from my phone that was the inside of a Galaxy 98vhp, to which I finished installing nitros. I simply grabbed the wrong photo and cannot edit or delete the post.

    Feeling stupid, I will now post the correct picture. The picture was just to inform anyone (that didn’t know) which board is being used in this relatively new model.

    Prodece with ridicule in 3...2...1...
     

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  11. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    ***Fixed***

    Audio chip. Even after reflowing all the legs, there was still no audio. Then, I resoldered it while it was turned on and it got scratchy as I soldered. I desoldered everything, cleaned all the traces and legs, then resoldered.

    Thanks guys!
     
    NZ8N, TM86, 999 and 1 other person like this.
  12. Eldorado828

    Eldorado828 From the high plains of Texas

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    I had a mx-36hp2 same issue once! Glad you gotter going
     
    NZ8N likes this.
  13. 999

    999 Well-Known Member

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    I looked up a video of an unboxing of a new 39VHP on youtube and I became a bit confused as to where the power plug was in your first picture. Now it makes MUCH more sense.
    Is there a board number on this radio somewhere? Because it's not in this picture anywhere that I can find.
     
    #13 999, Apr 8, 2019
    Last edited: Apr 9, 2019
  14. KD8HMO

    KD8HMO Sr. Member

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    Was the audio chip the problem right out of the box?
     
  15. CbRadiosPRONTO

    CbRadiosPRONTO Performance Ready Radios

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    Poor solder joint at audio chip. Though, even after I reflowed it, the problem still persisted. I didn’t diagnose it until I started reflowing solder while the radio was on so I knew when o was onto something.
     
    NZ8N likes this.

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