Test points at VR1, VR2 and VR3 read Zero

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This topic contains 3 replies, has 2 voices, and was last updated by  BrianV 1 year, 3 months ago.

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  • #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?

    #3070

    Keith Groth
    Participant

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

    #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?

    #4945

    BrianV
    Keymaster

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

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