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BLI NW 2 Paragon with QSI resets after power shutoff

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  • Member since
    September, 2006
  • 143 posts
BLI NW 2 Paragon with QSI resets after power shutoff
Posted by strider on Monday, February 04, 2019 9:50 AM

I did a search and came up empty, and also posted this in electronics. I have an older BLI NW2 with the QSI decoder and every time I shut the power off and turn it back on the decoder resets. Never did this before. Any help would be appreciated. Thanks

  • Member since
    April, 2003
  • From: Clinton, MO, US
  • 3,919 posts
Posted by Medina1128 on Monday, February 04, 2019 10:13 AM

I had a Santa Fe #3751 4-8-4 Northern with a BLI older decoder. I think it was a Quantum decoder. I ordered a newer locomotive with their Paragon2 or 3 decoders, and have had no issues with it. My layout is DC controlled, and with their DCMaster box, I can reprogram many of the decoder functions.

  • Member since
    August, 2003
  • From: Collinwood, Ohio, USA
  • 7,279 posts
Posted by gmpullman on Monday, February 04, 2019 12:59 PM

strider
I have an older BLI NW2 with the QSI decoder and every time I shut the power off and turn it back on the decoder resets.

It is quite possible that the little glass reed switch is "stuck" closed. You can try passing a strong magnet over it a few times to try to free it up, or cut it out and if you ever need to do a reset you'll have to use a jumper across the pads where the switch was soldered in.

This is a possibility, of course. Maybe it is another problem. But if the reed switch is constantly "closed" it will reset every time track power is applied.

Hope that helps,

Ed

  • Member since
    September, 2006
  • 143 posts
Posted by strider on Monday, February 04, 2019 1:49 PM

Thanks, I believe that worked. I ran a magnet over the top of the hood then powered it on and off a couple times and it stayed programmed. Thank again!

  • Member since
    August, 2003
  • From: Collinwood, Ohio, USA
  • 7,279 posts
Posted by gmpullman on Wednesday, February 06, 2019 10:29 AM

strider
Thanks, I believe that worked.

Glad to hear it.

BLI/QSI (or their supplier) somehow got a ton of poor quality reed switches. Many of them were used for "chuff sensors" on steam locomotives, triggered by a magnet on the flywheel. These would often "freeze up" and stop the exhaust sound.

Cheers, Ed

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