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Galaxy 94hp frequency display issue

Discussion in 'CB and Export Equipment and Accessories' started by Mk121, Aug 9, 2018.

  1. Mk121

    Mk121 Member

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    I have a 94hp that the first 3 digits of the display went out. The last two are still lit up fine. Checked the connections, ebreveryth seemed good. Any ideas? Thanks


     

  2. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    Go here...
    http://www.cbtricks.com/radios/galaxy/dx94hp/index.htm

    Locate PCB Layout and Parts section (scroll down to it)...

    locate Channel and Frequency Display - highlite and go to that page and review...

    More than likely a simple re-heat of solder Possible torn or broken solder joint but it's on the edge connector - so be careful.

    :+> Andy <+:
     
    Shadetree Mechanic likes this.
  3. Mk121

    Mk121 Member

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    Andy,
    Ok thanks I found the PCB layout. Would it be the r30 through r9 section that I should touch up first?
     
  4. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    (...going back and looking myself...)

    [​IMG]

    Bottom side
    [​IMG]

    Display digit board...

    [​IMG]

    Take your time on this - look over all this stuff for this is what I think you have - but is it what you ACTUALLY have?

    You should also look for PHYSICAL damage - dropped case - nicked corner - tapping on the board you hear a twang and see vibrating parts...

    IT those sections you will need to take a closer look...
     
  5. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

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    Do you see it yet?

    Bottom graphic, note the upper and lower sectional of the card, right where the two meet - in the center where upper and lower are - note the wording COM 1,2, 3 and COM 4,5,6 and 2DP?

    That is what I'm thinking...

    Back to the channel board with the "guts" for the frequency counter and display...

    Q 4 and Q5 poll - they rapidly turn the leads on and off....one on, the other off, the other is now on, this one goes off - cycle sort of thing...If you are missing one side and it seems the board connection is ok, these SMD parts may be the problem.

    :+> Andy <+:
     
  6. Mk121

    Mk121 Member

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    Yep I see what you talking about. That should be what I have. I will pop it open again later today and try to locate the area you are referring to. Will let you know what happens. Thanks
     
  7. Martian

    Martian Active Member

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    As a sidenote to this if one of the resistors was at fault the symptom would be the same segment on several digits not working. You might see a 0 instead of an 8 for example on the digits that share that common.

    This is what is referred to as a multiplexed display.

    It's likely what @Handy Andy says. A broken track where the boards meet, the switch (transistor) itself or a support component. Possible but less likely is the microcontroller itself which if I recall correctly is a holtek MCU with a simple counter application.
     

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