Results 1 to 7 of 7

Thread: VISAR Power Fuse

  1. #1
    Join Date
    Nov 28, 2012
    Location
    Great Black Swamp Midwest USA
    Posts
    287
    Thanks
    91
    Thanked 178 Times in 81 Posts
    Country: United States

    Default VISAR Power Fuse

    Does anyone know what value the smt fuse is for a VHF visar.
    The fuse is the one just off of the positive power pin.
    Bob
    Common sense is Uncommon.
    You can't fix stupid, but eventually it takes care of itself.


  2. #2
    Join Date
    Feb 12, 2012
    Location
    Directly above the center of the earth.
    Posts
    2,678
    Thanks
    793
    Thanked 1,343 Times in 664 Posts
    Country: Christmas Island

    Default

    It's most likely 4-5A, that's what earlier portables used. The radio will draw about 1.5-2 under normal use, so they build in a fudge factor.

  3. #3
    Join Date
    Nov 28, 2012
    Location
    Great Black Swamp Midwest USA
    Posts
    287
    Thanks
    91
    Thanked 178 Times in 81 Posts
    Country: United States

    Default

    Thanks Alpha.
    I found one for a MTX8000 that I had in my totes full of old Moto stuff. Radio transmits now, beeps come through the speaker when they should, but no receive audio. I guess I'll save it for a cold winter day.
    Common sense is Uncommon.
    You can't fix stupid, but eventually it takes care of itself.

  4. #4
    Join Date
    Feb 12, 2012
    Location
    Directly above the center of the earth.
    Posts
    2,678
    Thanks
    793
    Thanked 1,343 Times in 664 Posts
    Country: Christmas Island

    Default

    Check the front case where the circuit board is held in place by a metal sliding clip. If the board isn't held very tightly against the flex that goes to the speaker and volume control under the PCB, you'll lose audio. You can also put in some polyurethane foam between the front PCB and the metal RF shields to keep the pressure on the PCB when the radio is closed up. This is a frequent problem, the plastic posts the clip attach to become worn or bent and the clip doesn't provide the pressure it needs to.

    Oops, just noticed you said you're getting beeps but no RX audio. That's not good, that more likely means problems with the RF deck or the flex between the controller and the RF board. Ugh. Get your O'Scope out...

  5. #5
    Join Date
    Nov 28, 2012
    Location
    Great Black Swamp Midwest USA
    Posts
    287
    Thanks
    91
    Thanked 178 Times in 81 Posts
    Country: United States

    Default

    This radio looked like it had been in a mud puddle or something. It does beep when changing channels and on power up. I will check the spots you suggested. I have a bad habit of trying to fix broken radios. My next project is going to be to try to make 1 Minitor 3 from 3 junk box units. I guess I need a new hobby.
    Common sense is Uncommon.
    You can't fix stupid, but eventually it takes care of itself.

  6. #6
    Medic21 No Longer Registered

    Default

    Thanks for the post fellas. great reading.

  7. #7
    Join Date
    Nov 28, 2012
    Location
    Great Black Swamp Midwest USA
    Posts
    287
    Thanks
    91
    Thanked 178 Times in 81 Posts
    Country: United States

    Default

    Does anyone have a service manual for the VHF Visar?
    Common sense is Uncommon.
    You can't fix stupid, but eventually it takes care of itself.