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Galaxy DX 88HL can't adjust high power.

Discussion in 'General CB Services Discussion' started by Low_Boy, Jun 3, 2019.

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  1. Low_Boy

    Low_Boy Sr. Member

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    I have been testing parts and can not find anything bad including VR16 and VR13. Both VR 13 and 16 will adjust low power but when I put the button in Hi I get a 20 watt dead key and it will not adjust. Any help is appreciated. I can not figure out jow the circuit works.


     

  2. sonoma

    sonoma Sr. Member

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    try this on it. turn the mic gain all the way down. turn the low power VR all the way down. then adjust the high power 1st. then try to adjust the low power to 1 or 2 watts. see if that will work.

    I had a 88 a few years ago and the low power would keep the high power unadjustable if it was turned up too high.
     
    #2 sonoma, Jun 3, 2019
    Last edited: Jun 3, 2019
  3. Low_Boy

    Low_Boy Sr. Member

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    Hope you are right. That may be the only thing I didn't try. I will start with both at 0 and no mod.
    Thanks
     
  4. Low_Boy

    Low_Boy Sr. Member

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    No luck 20 watts no adjustment as soon ad I hit the button.
    Thanks
     
  5. nomadradio

    nomadradio Analog Retentive

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    If both trimpots work on Low side, someone has d!cked with the switch wiring.

    73
     
  6. sonoma

    sonoma Sr. Member

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    have you made sure the VR is good?
     
  7. Low_Boy

    Low_Boy Sr. Member

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  8. Low_Boy

    Low_Boy Sr. Member

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    Both good.
     
  9. OldTech03

    OldTech03 Sr. Member

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    Make sure R238 is still there and not modified or shorted out or replaced with a diode or wire.
     
    Robb likes this.
  10. Low_Boy

    Low_Boy Sr. Member

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    R238 is in it is the right value and tested good.
    I pulled the front off the radio. No one ever monkeyed with the Hi Lo power switch or it's wiring.
    Wiring is correct and the switch checked good. The switch wires go to where they are supposed to go as to Galaxy 88 wiring diagram. Then I traced the two traces that go to VR 13 and VR16 no blobs, breaks or bad traces. Low power I get 3.4V on VR 13 and VR16. High power I get 9.22V on VR13 and 0V on VR 16 I tested that against my other Galaxy 88

    The good working radio gets the same voltages for low power. On high power I get the same 0 volts on VR16 and I can very the voltage on VR13 by moving the variable resistor. but even cranked all the way open I can only get 7 volts. So possibly something is putting out more power than it should be.

    Could it be a bad mode switch? Does not make sense.
    I hope this can be understood I am going on little sleep.
     
  11. Low_Boy

    Low_Boy Sr. Member

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    Fixed
    Can someone please explain. The leg of vr13 that goes to ground was never soldered. That is how it was when I got the radio. Some VR's only have 2 soldered legs. Why does this need 3 to work?
     

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