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Offline GutstringTopic starter
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« on: July 11, 2020, 07:42:04 am »
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Howdy all,
I was out detecting the other day, and my MXT suddenly went dead. I tried turning it back on, and noticed there was a bit more then normal friction in the knob when I tried turning it back on. When I got home, I opened up the case, examined the rheostat.  The point where it turns on and off was "moving around". I also noticed a spark as I tried to turn it off and on, so out came the batteries. The rheostat was marked B100k with 6 pins. This should be a fairly easy swap?? Just replace with the same one, I think? Does anyone have a good source for high quality rheostats? Should I watch for any unseen problems, or is it a straight forward project. Any feedback would greatly be appreciated. Thanks!
Gutstring

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Offline Eugene52
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« Reply #1 on: July 12, 2020, 11:37:05 am »
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Quote:Posted by Gutstring
Howdy all,
I was out detecting the other day, and my MXT suddenly went dead. I tried turning it back on, and noticed there was a bit more then normal friction in the knob when I tried turning it back on. When I got home, I opened up the case, examined the rheostat.  The point where it turns on and off was "moving around". I also noticed a spark as I tried to turn it off and on, so out came the batteries. The rheostat was marked B100k with 6 pins. This should be a fairly easy swap?? Just replace with the same one, I think? Does anyone have a good source for high quality rheostats? Should I watch for any unseen problems, or is it a straight forward project. Any feedback would greatly be appreciated. Thanks!
Gutstring


Hello Gutstring.

I have my broke Whites MXT 300 taken apart and if its the same as yours there are 5 wires to two connectors, the top 2 wires are green [on-off] and bottom 3 other wires are black, brown , red to connector [Gain]. Mouser may have it in stock. Possibly Digikey may have it too. I tried to post a picture from my phone but did not go through here. I have been working out of town so I will post a picture when i get home. Its not a multi turn but a single turn potentiometer . Should be a common and inexpensive part. Check Mouser or Digikey or even Jameco electronics. Since I heard Whites Electronics may be shut down now, you may have to fix it yourself which would be no problem , since you have help here on the Great "Thunting.com"  !!!!

I will post more info in a few days.

Please Stay Safe and Best Regards.............Eugene
 

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Offline nickel_n
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« Reply #2 on: July 12, 2020, 03:41:02 pm »
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find out the value of the pot.
then buy one with an on-off switch,and re-solder the wires to it.
Whites selling one for the classic SL series for $9.95 on there web site.

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https://www.whiteselectronics.com/product-category/parts/page/2/

please post a photo of the broken  part Smiley

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Offline GutstringTopic starter
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« Reply #3 on: July 14, 2020, 03:19:30 am »
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Thanks for the help. I figure I'll do the repair. So it's pretty much a straight forward swap. I'll get a pic tomorrow and post of the part.  Thanks for the quick response. I'm looking forward to learning from all the large amounts of knowledge here and hopefully give a little back ( if possible). I'm going to locate the potentiometer, I'll check those places Eugene.

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Offline Eugene52
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« Reply #4 on: July 14, 2020, 04:31:29 pm »
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Quote:Posted by Gutstring
Thanks for the help. I figure I'll do the repair. So it's pretty much a straight forward swap. I'll get a pic tomorrow and post of the part.  Thanks for the quick response. I'm looking forward to learning from all the large amounts of knowledge here and hopefully give a little back ( if possible). I'm going to locate the potentiometer, I'll check those places Eugene.


Hello Gutstring.
Thank-you for posting on our Great Forum !!!!
Finally got my camera working. All the bells and whistles to adjust , LOL.
B100k is what's in my MXT too .

Here are a couple of photos. Since I need a lot of practice with this Nikon .
I think anyone can out photo me on closeups , outside of the house shots are easy.

Best Regards and Everyone Please Stay Safe .

Eugene

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Offline nickel_n
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« Reply #5 on: July 14, 2020, 05:20:33 pm »
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Quote:Posted by Eugene52
B100k is what's in my MXT too .
Eugene

100K pot with switch.the same as the SL
look at the link i post.$9.95 from White's including cables and possibly the same connector


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