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  #1  
Old 22-01-2021, 09:48 AM
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Merlin66 (Ken)
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SW electronic focus motor controller!!!

Not sure what has happened in my life!


I use many (seven at the last count!) of these motors/ controllers.
All the focusers, the etalon tuning etc.


At Xmas one of the handcontrollers failed. Changed batteries, checked connections etc. but no luck....
It's now the 22 Jan and so far I've had another two failures!!!!
I now have three controllers u/s.


I found the wiring diagram and managed to identify most of the components.
Simplistically I think the push buttons have gone to meet their maker.
(These seem to be "TL2285 OE" push buttons -https://www.digikey.com.au/catalog/en/partgroup/tl2285-and-tl4201-series/9456)


I'm definitely not an electronics guy.....but I assume these are replaceable.
Has any one else experienced similar failures????
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  #2  
Old 22-01-2021, 10:49 AM
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Yes, they are replaceable.
How many failed? Do they work sometimes?
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  #3  
Old 22-01-2021, 11:08 AM
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Merlin66 (Ken)
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Bojan,
On two of them both buttons don't seem to work, on the third one button still works.
I haven't been able to find an aussie source for these buttons.
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  #4  
Old 22-01-2021, 11:19 AM
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How about this one?
https://au.rs-online.com/web/p/push-...tches/3543459/


also ebay:
https://www.ebay.com.au/itm/5-8-7-8-...0AAOSw-phciu0X

Last edited by bojan; 22-01-2021 at 11:34 AM.
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  #5  
Old 22-01-2021, 12:50 PM
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Merlin66 (Ken)
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Bojan,
The 8.5mm eBay version looks like a direct equivalent.
I'll order some, see how we go.
Thanks!
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  #6  
Old 22-01-2021, 01:25 PM
Pepper (Steve)
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I replace these regularly in my pinpointer for metal detecting.
Super easy, just need some solder, iron, and some gootwick
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  #7  
Old 22-01-2021, 01:48 PM
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So they seem to be dodgy quality? They should last couple of hundreds of thousands activations..



Quote:
Originally Posted by Pepper View Post
I replace these regularly in my pinpointer for metal detecting.
Super easy, just need some solder, iron, and some gootwick
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  #8  
Old 22-01-2021, 01:58 PM
Pepper (Steve)
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They probably are ok Bojan. Just the pinpointer gets constantly turned on and off, and being used in dusty/muddy conditions.
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  #9  
Old 22-01-2021, 03:43 PM
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Merlin66 (Ken)
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Bojan,
I think the quality is probably “cost effective” for the controllers.
I haven’t heard that many others are complaining........
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  #10  
Old 22-01-2021, 05:55 PM
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doppler (Rick)
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I have one with the exact same problem, out of warranty time wise but not a lot of use, so yes a quality problem me thinks.
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  #11  
Old 22-01-2021, 07:03 PM
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If the microswitches I’ve ordered work out, I’ll make the “extras” available to the members.
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  #12  
Old 23-01-2021, 02:50 PM
Rerouter (Ryan)
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The switches are rated for a lot of actuations, however they hate getting wet, once you have replaced the old ones, crack one open, top guess would be corrosion on the switch foil,
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  #13  
Old 23-01-2021, 03:15 PM
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Merlin66 (Ken)
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Ryan,
Thanks, but I don’t think my controllers have ever been outside the office.
Certainly not exposed to rain or heavy dust etc.
I’ll definitely pull one apart when the others arrive.
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  #14  
Old 05-03-2021, 01:09 PM
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Update:
I ordered "drop in replacement" switches from eBay, and got some desoldering braid.
The switches arrived yesterday, and within 30 mins today I had all three hand controllers repaired and fully functional!!!
Total cost $12 - that works out at $4 per unit to repair.
Well worth considering.
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  #15  
Old 05-03-2021, 07:41 PM
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iborg (Philip)
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Hi Merlin

An idea to consider, give them spray with silicone lubricant. Might lube the contacts and at least limit corrosion.

Philip
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  #16  
Old 05-03-2021, 08:25 PM
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Merlin66 (Ken)
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Philip,
I don't think the failure were corrosion.
They just basically stopped!
Replacing the switches is the way to go..worked 100%
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  #17  
Old 06-03-2021, 05:45 PM
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iborg (Philip)
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Hi

At least they sound easy to replace.

Good luck with the new ones.

Philip
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  #18  
Old 06-03-2021, 08:12 PM
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Merlin66 (Ken)
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Philip,
So far so good.
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