# TAZ 5 Z homing issue

**URL:** <https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311>\
**Category:** LulzBot TAZ\
**Created:** [November 17, 2018, 6:48am UTC](https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311 "2018-11-17T06:48:41Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![mr\_tim34](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@mr\_tim34](https://forum.lulzbot.com/u/mr_tim34)\
**Post date:** [November 17, 2018, 6:48am UTC](https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311/1 "2018-11-17T06:48:41Z")

</div>

All of a sudden my Z-Axis won’t home. I’m printing from the SD card, when it goes to home the Z-Axis it makes a buzzing sound and it won’t drive down. I manually drove the z-Axis to it’s home position and I can MOVE AXIS in 1mm steps up and down without any problem, but when I try to home the Z-Axis it buzzes and doesn’t move down. I replaced the two Z-Axis steppers and I still have the same problem. Any suggestions?

Thanks,

TiM

---

<div class="post-metadata">

**Author:** ![kmanley57](https://avatars.discourse-cdn.com/v4/letter/k/13edae/32.png) [@kmanley57](https://forum.lulzbot.com/u/kmanley57)\
**Post date:** [November 17, 2018, 10:58am UTC](https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311/2 "2018-11-17T10:58:54Z")

</div>

If you have recently adjusted your X axis belt tension then you are causing binding on Z. If you have not then your Z driver on the Control board is probably not working well any more. Measure the Z Ref. test point on the control board and see what it reads(Located near the Z driver chip). Should read around 1.2 or more volts.

---

<div class="post-metadata">

**Author:** ![mr\_tim34](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@mr\_tim34](https://forum.lulzbot.com/u/mr_tim34)\
**Post date:** [November 17, 2018, 11:13pm UTC](https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311/3 "2018-11-17T23:13:17Z")

</div>

It’s reading about .85 volts…

---

<div class="post-metadata">

**Author:** ![mr\_tim34](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@mr\_tim34](https://forum.lulzbot.com/u/mr_tim34)\
**Post date:** [November 18, 2018, 12:21am UTC](https://forum.lulzbot.com/t/taz-5-z-homing-issue/6311/4 "2018-11-18T00:21:41Z")

</div>

Solved the issue after a call to Lulzbot support. Reflashed the firmware and all is now good. Wish I’d tried that before I replaced the steppers. So it goes 🕶