Polar EM 92 won't Calibrate

Discussion in 'Cutters and Trimmers' started by hps2322, Jul 16, 2019.

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  1. hps2322

    hps2322 Member

    Joined:
    Jun 2010
    Messages:
    13
    Location:
    Irvine, CA
    Please help. I have a Polar EM 92. It was working great but all of a sudden the back gauge came all the way forward. If we put a new measurement in it would go back but then again all the way foraward. I shut the machine off thinking it was just a calibration issue but when I turned back on the machine and pushed the handle to Calibrate it just went all the way back and stopped. All that is on the screen is a zero. I checked the battery and it has power, all the fuses seem good. Any help as to what is causing this is highly appreciated.
    Thank you - Hank
     
  2. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    1,736
    Location:
    Managua,Nicaragua
    Hi sir:

    Please test:

    1) Keyboard power supply Display: +9Vdc if you are measuring for example:9.3 Vdc is faulty power supply
    repair or replace.

    2) measure the Power supply Keyboard BR:+5vDC again if you measure 5.3 Vdc is faulty the power supply repair or replace

    3) If everything is o.k in the points 1+2 go the electronib board TAM: look for LED's ; a) LED V1 ON or OFF - flashing when moving backagauge b)LED V2 On or OFF Counting forward. c) LED V3 ;OFF will lit up by o.5 seg when passing Reference point.
     
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