Test points at VR1, VR2 and VR3 read Zero

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  • January 25, 2017 at 10:52 am #3069
    Keith Groth
    Participant

    The first voltage check for 5VDC passed. Soldered controller chips and VDC test at VR1, VR2 and VR3 all read 0.0 through full range of the pots. 24VDC applied at TB5.

    Any ideas?

    January 25, 2017 at 3:17 pm #3070
    Keith Groth
    Participant

    A bit of additional info: TB6- to U5 was 22.5 vDC
    and TB6- to U4 was 5 VDC

    January 29, 2017 at 11:20 pm #3157
    BrianV
    Keymaster

    The pot is in a simple voltage-divider circuit.

    • Potential that U8 and/or U9 are upside down
    • resistor missing/not installed

    Do you still have 5V at the test point?

    June 12, 2017 at 8:35 am #4945
    BrianV
    Keymaster

    Following up on some older questions – did you have an update?
    BrianV

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