# Q2686 not responding

**URL:** <https://forum.sierrawireless.com/t/q2686-not-responding/6696>\
**Category:** Legacy AirPrime modules\
**Created:** [August 27, 2013, 4:49am UTC](https://forum.sierrawireless.com/t/q2686-not-responding/6696 "2013-08-27T04:49:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vamsi547](https://avatars.discourse-cdn.com/v4/letter/v/ed655f/32.png) [@vamsi547](https://forum.sierrawireless.com/u/vamsi547)\
**Post date:** [August 27, 2013, 4:49am UTC](https://forum.sierrawireless.com/t/q2686-not-responding/6696/1 "2013-08-27T04:49:17Z")

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In Some of the power ONs Q2686 is not responding. It is not giving any wind responses. It is not respoding to even AT commads also.

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**Author:** ![davidc](https://avatars.discourse-cdn.com/v4/letter/d/a183cd/32.png) [@davidc](https://forum.sierrawireless.com/u/davidc)\
**Post date:** [August 27, 2013, 5:26am UTC](https://forum.sierrawireless.com/t/q2686-not-responding/6696/2 "2013-08-27T05:26:07Z")

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Hiya,

A couple of thoughts/things to check:

- Your power supply (VBatt) is within tolerance (3V3 to 4V2) and you have grounded the shield pins properly?
- Your power supply can supply enough current at start-up/Power on? (see the start-up current waveform in the PTS\*)
- The ON/OFF signal is HIGH (greater than 0.8 \* VBatt) for more than 1500mS when you are trying to start the module?
- The RESET pin is not stuck LOW? According to the PTS, you shouldn’t be relying on the Reset signal anyway - it’s for emergency use only. The module will be held in reset (i.e. not respond to ANYTHING) as long as the RESET pin is held low.
- Ensure the BOOT pin is OPEN - otherwise the module will start the internal bootloader firmware and be waiting for commands from the DWLWin PC package.

Note that the Boot, Reset and On/Off pins are very close together, so it might also be worth doing a VERY close inspection of your hardware to make sure that there are no manufacturing faults such as solder whiskers between the pads…

\*PTS = Product Technical Specifications

Hope this gives you some pointers to try and track down what’s happening on your modules.

ciao, Dave