Eggtimer Quantum not arming...

Hi all,
So one of my ET Quantums (or should that be Quanti..?) had a bit of a violent knock a while back. There doesn't seem to be anything visibly wrong, and I get the wifi connection no problem (see pic), but it won't arm when fully hooked up to charges etc. When I try to run a test it runs through the countdown then pauses and bleeps... Has anyone else had this problem?
Is it repairable?
Thanks for any thoughts.

Check your optoisolators, if you got a bad knock one of the leads or a solder joint could be broken. Also check the 472 resistor next to the FET's pads.

cerving said:

Check your optoisolators, if you got a bad knock one of the leads or a solder joint could be broken. Also check the 472 resistor next to the FET's pads.

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Thanks Cris. Will do.

Tim51 said:

Quantums (or should that be Quanti..?)

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Quanta

Just based on the picture, both channels don’t have continuity. I don’t think it will arm if you have “activated” the channels for deployment and you don’t have continuity. Obviously Cris is the expert but my 2 cents. He mentioned the optoisolators which were An issue for me when I put my first quantum together. But I had continuity and they weren’t firing during testing

The optoisolators are involved in both the continuity and the firing circuits, so it may be possible to have one work but not the other depending on which optoisolator isn't connected.

Thanks all for the input. I should say that when I did the arming check I linked up all terminal blocks to my usual light bulb testing rig. When that didn't work, I did a live test with actual ignitors. Both times it didn't fire - count down, then pause, then bleep. I've done a close inspection of the 472 and the Optoisolators. All joints seem secure and there's no sign of damage to the leads or the solder joints. Picture attached.

That 472 resistor by the FET doesn't look like it's making contact with both pads... that would affect continuity. I also see a couple of questionable solder joints to the WiFI module, check them out with a 10x jeweler's loupe.

cerving said:

That 472 resistor by the FET doesn't look like it's making contact with both pads... that would affect continuity. I also see a couple of questionable solder joints to the WiFI module, check them out with a 10x jeweler's loupe.

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Thanks Cris. After I'd posted I reflowed the WiFi connections. I'll have a look at the 472 again tomorrow.

It might just be the photo, but to me, it looks like the middle pin on the FET is suspect.

Also, I don’t think you’ve said specifically- are you getting continuity, but not firing?

Charles_McG said:

It might just be the photo, but to me, it looks like the middle pin on the FET is suspect.

Also, I don’t think you’ve said specifically- are you getting continuity, but not firing?

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Thanks - I think some of that is just shadow on from the angle of the light in the photo, but I will check again. I got round to reflowing some joints but had to stop early. I'll have another look at it, hopefully later this weekend. At the moment the status page shows the Drogue and Main as both red, indicating I don't have continuity on either.

Thanks chaps - checked and reflowed all the connections as you suggested, and screen showed continuity on drogue and main. Following that I did a test this evening with bulbs using the test page and both lit up on cue. All your help much appreciated.