Kustom Talon 35.5 Troubleshooting

Discussion in 'Testing Group Discussion' started by InsipidMonkey, Mar 25, 2018.

  1. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    I recently picked up a used Kustom Talon in non-working condition to mess around with. I troubleshooted some power issues and repaired some loose connections within the unit, and got it to power up. It passes the self-test and is transmitting at 35.5, but I am not getting any speeds displayed (either vehicles or tuning fork). Un-squelcing the audio just sounds like white noise/static.

    Any ideas?
     
  2. Choose Life

    Choose Life 35.5 hater R3 Day One User Advanced User Premium Member

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    Bad receiver?
    Sounds like its not calculating the doppler shift waves once they bounce back
     
  3. radarrob

    radarrob Newcumber Advanced User Premium Member

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    Bad microwave fried.
     
  4. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    The microwave source is fine, and I can pick it up with an RD. It seems to be something on the receive side, either the detector diode or something in the DSP signal path.

    The schematics are in the FCC filing. I'll see if I can figure out where the problem is.
    fccid.io: TAL Schematics Kustom Signals Inc
     
  5. Choose Life

    Choose Life 35.5 hater R3 Day One User Advanced User Premium Member

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    Keep at it
    My PL2 would power up but quit locking speeds
    Took it apart lined it up tightened it down
    Works better than before

    Was worried when i found a high class 3 laser inside and if a part needed replaced i wouldnt of known which

    Complex machines to troubleshoot to say the least
    Simple to repair once you know whats wrong and have the materials
     
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  6. radarrob

    radarrob Newcumber Advanced User Premium Member

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    Of course it will alert to a detector with out speed. It’s a bad diode/microwave that needs replacing. My Stalker II microwave long time ago had same experience very loud static,would not read speed and also not read a fork. Stalker put a new microwave on it and till this day works amazing.
    --- Double Post Merged, Mar 26, 2018, Original Post Date: Mar 26, 2018 ---
    I have a couple units that won’t power on. Care to share what might need to be fixed/replacement or trouble shoot.
     
  7. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    That's the odd thing, it looked like this unit had a brand new microwave unit, and the Gunn oscillator half wasn't even properly connected. It looks like the Schottky diode is in the bottom half of the unit, maybe it isn't properly connected to the PCB? When I have time I'll open it up again and check.

    As far as power issues, I just traced the power path into the gun with a multimeter until I found breaks.

    Is the handle providing the correct amount of power (~7.8V I think)? The pinout is in the circuit diagram linked above.

    The handle slides into a PCB at the bottom of the gun. I cleaned the contacts with an eraser. This PCB is connected to the main circuit board via a ribbon cable that is accessed when the main circuit board is slid out. Make sure it is properly connected and not damaged. I found some pins bent in the connector the cable plugs into on mine. Straightening them out allowed the ribbon cable to seat properly and make a good connection.

    Another ribbon cable attaches the screen to the main circuit board, and the small connector next to it powers the speaker. Make sure these are properly connected and not damaged.

    I'll take pictures of the above parts when I have the unit open again.
     
  8. GTO_04

    GTO_04 Premium Member Advanced User Premium Member

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    On the Talon, the conductive rubber power on switch is a weak spot. The conductive rubber wears down and doesn't make good contact.

    GTO_04
     
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  9. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    So I had some more time to work on this. Turns out the receive side diode wasn't attached to the PCB either!

    Here are some pictures of the teardown:

    Battery handle connector. I cleaned these contacts with an eraser. There are some on top too, but I didn't bother removing those screws to get at them.
    0329181322a.jpg

    As you slide the radar assembly out of the case, you expose this ribbon cable under the main PCB. Gently remove it being careful not to damage the ribbon cable.
    0329181322.jpg

    When I received this unit, some of these pins were bent and the connector was not properly seated.
    0329181324.jpg

    View of the entire assembly with daughter PCBs detached.
    0329181324a.jpg

    The black cylinder in the middle of this picture I believe to be the Schottky diode from the receive circuitry. (Edit: Just a normal diode. Schottky diode is in the waveguide (gold box)). It should be attached to that hole labeled "DET +", but is just hanging free.
    0329181339.jpg

    So I soldered it back into place.
    0329181350.jpg


    Success!
    0329181358.jpg
     
    Last edited: Mar 29, 2018
  10. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Ok I'm IMPRESSED !!

    Great job.

    The sinister side in me thinks that might have been "purposefully decommissioned ". Especially the Final i can use it but not obtain speed readings !!

    I know a certain 3 Letter Govt agency that would do that on smartcard readers .. or so I read about.

    Great job !!! +1 for us "sheep".




    Posted from my iPhone using the RDF Mobile App!
     
  11. Tallyho

    Tallyho Premium Member Advanced User Premium Member

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    Congrats on getting it working!

    Of course you know this means we will be sending our non working units to you for refurb.
     
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  12. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    I actually think it was in the process of being repaired when it was sold. The radar unit (Gunn oscillator and receiver) are new, they just were never properly attached to the PCB. I noticed the oscillator wasn't attached the first time I took it apart and connected that to get it to transmit, but I didn't realize the receive side was disconnected as well.

    Glad I got it working!
    --- Double Post Merged, Mar 29, 2018, Original Post Date: Mar 29, 2018 ---
    Thanks! I actually have another unit on my bench awaiting parts. Luckily both of them have relatively minor issues and were easy to troubleshoot.

    I'd be happy to take a look at non-functioning units if you want, with the proviso that electronics are just a hobby for me so there is no guarantee I won't make things worse when trying to fix it :)
    --- Double Post Merged, Mar 29, 2018 ---
    Anyone have any idea what these DIP switches do?

    upload_2018-3-29_15-15-49.png
     
    Last edited: Sep 28, 2018
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  13. benzr

    benzr Been there done that !! Original V1 user !! Advanced User

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    Ok i put "paranoid" benzr in the Time out room L0L

    My alter ego has seen much and tends to distrust "strange" occurrences ... such as "not finished" repairs etc.

    So you're the one to send our electronics to ..... KewL.


    Posted from my iPhone using the RDF Mobile App!
     
  14. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    @DBMW30 Would you be willing to partially disassemble your moving mode Falcon HR to peek in and see what these DIP switches are set to? Just need to loosen the 4 Phillips head screws on the front. I'm wondering if these control things like moving/stationary and MPH/KPH?
     
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  15. DBMW30

    DBMW30 . Intermediate User Premium Member

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    Last edited: Oct 9, 2018
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  16. DBMW30

    DBMW30 . Intermediate User Premium Member

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    Last edited: Oct 9, 2018
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  17. InsipidMonkey

    InsipidMonkey Premium Monkey Advanced User Acceptus Premium Member

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    Cool! Thanks for the pictures.

    You're right, it looks like an updated circuit board design compared to the original Talon, and the DSP version is newer. I believe the Falcon HR uses a linearly polarized patch antenna, vs the conventional Gunn oscillator and microwave horn in the Talon.

    I appreciate you taking the time to check! I guess it's time to open mine up again and flip some switches...
     
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  18. Eaguar

    Eaguar PSL +5 Intermediate User

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    Have you tried contacting Kustom Signals about the switches? Or asked @radarrob if he maybe knows?
     
  19. JustinP

    JustinP PSL +PSL Advanced User

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    What's the fun in that? Just start flipping switches and try to figure out what it changed.
     
    Last edited: Apr 19, 2018
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  20. Allan Mx

    Allan Mx Learning to Drive General User

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    Pin 5, OFF=MPH, ON=KPH
    --- Double Post Merged, Nov 28, 2018 ---
    Pin 5, OFF=MPH, ON=KPH
     
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