# Gripper strange failure **URL:** \ **Category:** Newton Gripper\ **Created:** [September 29, 2021, 8:50pm UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707 "2021-09-29T20:50:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Seb](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Seb](https://discuss.bluerobotics.com/u/Seb)\ **Post date:** [September 29, 2021, 8:50pm UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707/1 "2021-09-29T20:50:46Z")
Hi I mounted on my ROV a gripper that I bought early 2019. I’m not using the gripper very often, but I have a strange failure since yesterday. When i try to open or close, the gripper only works in short pulses, as if it were stalled after a quarter of a second… I believe this is coming from the electronics board that is detecting motor stall. Could you confirm this could be the case? Did you have this problem before on other grippers? Is it possible to only replace the electronic board? I would not want to change the whole gripper unit. ---
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [September 29, 2021, 11:08pm UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707/2 "2021-09-29T23:08:00Z")
Hi @Seb, > [@Seb](#): > > When i try to open or close, the gripper only works in short pulses, as if it were stalled after a quarter of a second… How are you controlling it? Our [recommended control setup](https://www.bluerobotics.com/learn/newton-subsea-gripper-installation/#setup-in-qgroundcontrol) uses momentary presses, which means the opening/closing action only happens while you’re holding down the respective button (e.g. you can open it a small amount with a short press, or completely with a longer hold). > [@Seb](#): > > I believe this is coming from the electronics board that is detecting motor stall. > Could you confirm this could be the case? The gripper does detect and stop on stalls, so if you are holding down the momentary control (or using increment/decrement or min/max control) and it’s still stopping after short pulses then it does sound like your electronics could be damaged, in which case I’d recommend you contact [support@bluerobotics.com](mailto:support@bluerobotics.com) and link them to this thread, preferably also with a video of the unexpected behaviour, and an order number if you have it 🙂 > [@Seb](#): > > Is it possible to only replace the electronic board? I would not want to change the whole gripper unit. I believe it should be possible to replace the gripper electronics if need be, but our support team can give more detail on the available options. ---
**Author:** ![Seb](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Seb](https://discuss.bluerobotics.com/u/Seb)\ **Post date:** [September 30, 2021, 6:33am UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707/3 "2021-09-30T06:33:37Z")
> [@EliotBR](#): > > How are you controlling it? Our [recommended control setup](https://www.bluerobotics.com/learn/newton-subsea-gripper-installation/#setup-in-qgroundcontrol) uses momentary presses, which means the opening/closing action only happens while you’re holding down the respective button (e.g. you can open it a small amount with a short press, or completely with a longer hold). I control it with a Pixhawk and the “servo\_3\_min\_momentary” and “servo\_3\_max\_momentary” functions in QGC. This was working perfectly until 2 days ago. ---
**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\ **Post date:** [September 30, 2021, 6:35am UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707/4 "2021-09-30T06:35:09Z")
Ok. Assuming you haven’t changed your autopilot firmware or QGC since then it seems like the electronics are indeed likely to be damaged, so I’d recommend you contact the support email as outlined above 🙂 ---
**Author:** ![Seb](https://avatars.discourse-cdn.com/v4/letter/s/8edcca/32.png) [@Seb](https://discuss.bluerobotics.com/u/Seb)\ **Post date:** [September 30, 2021, 1:16pm UTC](https://discuss.bluerobotics.com/t/gripper-strange-failure/10707/5 "2021-09-30T13:16:02Z")
Ok thanks, I’ll see what they advice me to do… 🙂