Test points at VR1, VR2 and VR3 read Zero HomePage › Forums › HobbyCNC EZ Board Assembly › Test points at VR1, VR2 and VR3 read Zero This topic has 3 replies, 2 voices, and was last updated 5 years, 7 months ago by BrianV. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts January 25, 2017 at 10:52 am #3069 Keith GrothParticipant 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 GrothParticipant 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 BrianVKeymaster 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 BrianVKeymaster Following up on some older questions – did you have an update? BrianV Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Type in the text displayed above Log In Log in / Register