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Post by Mike_B on May 26, 2017 10:05:55 GMT -8
Hi guys I bought a great Trafalgar led watch but it had a fault. I figured my other trafalgar that worked module would fit this more exciting case. Sadly not the case. Watch lights up but cycles through zeros on the screen with no chance of setting time. It comes apart easy and looks like the board is quite dirty with some corrosion and crud. I am hoping this may be the reason so worth a try. Can anyone advise a good product to clean boards . This would be really helpful for me. Thanks
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Post by Deleted on May 26, 2017 10:55:15 GMT -8
Since the display seems to be functioning; it is likely that the clock/processor is not. There is a lot of corrosion on the trimmer; try turning that back and forth a few times(mark it's current position so you know roughly where it needs to be).
For the corrosion, you need something to neutralize it. Try a bit of backing soda solution on a Q-Tip.
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Post by Mike_B on May 26, 2017 11:01:51 GMT -8
Since the display seems to be functioning; it is likely that the clock/processor is not. There is a lot of corrosion on the trimmer; try turning that back and forth a few times(mark it's current position so you know roughly where it needs to be). For the corrosion, you need something to neutralize it. Try a bit of backing soda solution on a Q-Tip. Thank you sir. To ask another dumb question as I know so little. What is the trimmer?? (Sorry) Would baking soda /water mix not be too hard to clean off after. Surely it leaves some residue .
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Post by Deleted on May 26, 2017 11:14:53 GMT -8
Not dumb at all. You've asked the question that others may have wondered about The trimmer is that roundish thing with 4 brass tabs at the top/center of your first picture. A trimmer is usually a capacitor that is used to fine adjust the frequency of the quartz crystal. The corrosion there may be preventing any signal from the crystal getting to the processor.
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Post by Mike_B on May 26, 2017 11:44:17 GMT -8
Not dumb at all. You've asked the question that others may have wondered about The trimmer is that roundish thing with 4 brass tabs at the top/center of your first picture. A trimmer is usually a capacitor that is used to fine adjust the frequency of the quartz crystal. The corrosion there may be preventing any signal from the crystal getting to the processor. Thank you. Most helpful. I will investigate the trimmer further . I am surprised this would turn but I will try very gently with some tweezers. On the corrosion, can I confirm at little baking soda mixed with water and dab on? Leave for a minute I guess and try to wipe off and dry. Water goes against anything I know about electronics. I would be so grateful if this watch came back to life due to your advise. So much so that I would make a donation. I so much want it to work. The case , strap and crystal are near perfect condition
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Post by Deleted on May 26, 2017 12:14:37 GMT -8
Not dumb at all. You've asked the question that others may have wondered about The trimmer is that roundish thing with 4 brass tabs at the top/center of your first picture. A trimmer is usually a capacitor that is used to fine adjust the frequency of the quartz crystal. The corrosion there may be preventing any signal from the crystal getting to the processor. Thank you. Most helpful. I will investigate the trimmer further . I am surprised this would turn but I will try very gently with some tweezers. On the corrosion, can I confirm at little baking soda mixed with water and dab on? Leave for a minute I guess and try to wipe off and dry. Water goes against anything I know about electronics. I would be so grateful if this watch came back to life due to your advise. So much so that I would make a donation. I so much want it to work. The case , strap and crystal are near perfect condition The trimmer is normally turned with a crew driver fit in the center of it. If you look closely, you should see that the hole is not round or that deeper inside, is a slot or cross intended for the screw driver. When you turn the trimmer, the 4 brass tabs should not move as they are the contacts to the rest of the circuit. Normally water(particularly if left in place as in a flooded watch) is not good. For cleaning purposes and as a temporary carrier for the alkaline neutralizer, it is perfectly fine. Just make sure it is all cleaned off after dissolving that blue green sulphate material. I used to have to apply this process to my father's stereo; he would water plants sitting on it and inevitably there was some spillage which got inside and onto the circuit board. The trimmer in that unit was directly below one of the air vents that the water dripped through!
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Post by Mike_B on May 26, 2017 13:02:25 GMT -8
Trimmer looks square inside. I am going to try to clean everything first the more I look with my loop the worse it looks.
I can find any decent forums dedicated to led watches , there is one but you can't join it. I would like this working so much.
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Post by Deleted on May 26, 2017 14:56:13 GMT -8
Trimmer looks square inside. I am going to try to clean everything first the more I look with my loop the worse it looks. I can find any decent forums dedicated to led watches , there is one but you can't join it. I would like this working so much. Maybe give 'siralan' here on the forum a PM. He has done actual magic with circuits that looked worse than yours. As for the trimmer, it must move or the module could not be adjusted for good timing
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Post by Mike_B on May 27, 2017 14:12:25 GMT -8
Well i have spent hours cleaning and most of the corrosion has gone. Sadly it has done nothing. May well have got worse . I saw a few flashes of light earlier but less than 1 second. Now I get nothing... tried new batteries, spent hours with my loupe examining but I just have no electronic skill . Very sad now. Unless I have some luck I need to spend more of my life on eBay looking for another module but I will not be sure it's the same or compatible. I've not moved the trimmer as siralan says not to only s last resort. Thinking perhaps power somehow is not working
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Post by rob3rto on May 28, 2017 7:57:56 GMT -8
Get a multimeter and make sure you have unbroken tracks. Corrosion can break them. A little silver paint from the window demister repair kits can help. You might also find replacement modules. This guy junked the Litronix and fitted a National Semiconductor one. www.crazywatches.pl/trafalgar-led-1975
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Post by Mike_B on May 28, 2017 8:00:53 GMT -8
Get a multimeter and make sure you have unbroken tracks. Corrosion can break them. A little silver paint from the window demister repair kits can help. You might also find replacement modules. This guy junked the Litronix and fitted a National Semiconductor one. www.crazywatches.pl/trafalgar-led-1975Thanks , was thinking about a multi meter , not got one or used one... yet. Also was reading at breakfast about silver conductive pens
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Post by Mike_B on May 29, 2017 9:12:55 GMT -8
Hi guys , so I have been testing some of the exposed tracks with a multimeter and getting nice bleeps. When I put pos on left of trimmer and neg on the right I get no tone. Yet pos on the left and neg in the middle of the trimmer I get good tone. Is this a problem?
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Post by Mike_B on May 30, 2017 14:04:27 GMT -8
Hi guys, I have since been researching what could be wrong with this. I now have it firing odd digits on the readout when button is pressed. Googling resulted in classic quartz oscillator fault. Could be other things too but I want to try this. Issue I now have is working out what frequency this oscillator is? Can anyone suggest any ideas. Or is it purely trial and error?
Module is a good one (I believe)
Led module Mostek 03150-04
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