SOLVED Manatec Garage door opener - Page 1
Forum section: electronics / repair

author: Carl E
author_rank: Regular Contributor
timestamp: August 18, 2023, 11:12:56 pm
content: Hello,I managed to find a corroded ground on my garage door opener. I have more cleanup to do on the board as there are a few via that are nasty looking. The opener actually works, except the red LED which is supposed to flash when the button is pushed. Apparently someone managed to wipe off a component when attempting to open the case. The attached pix shows the red LED with no connection on one end. There is no circuitry on the wire side. I cant imagine what component would be mounted there ( three pads ) unless they used a transistor as a diode. Anyone want to venture a guess? 'This is a FOB for a 40 Mhz garage opener which is obsolete by todays standards. I really don't want to buy a new opener, just a working spare FOB. Thank you

author: tautech
author_rank: Super Contributor
timestamp: August 18, 2023, 11:39:40 pm
content: One of those pads is for the antenna connection, nothing to do with the LED.Instead concentrate on the corrosion about the via before the transistor that drives the diode.

author: DavidAlfa
author_rank: Super Contributor
timestamp: August 19, 2023, 11:46:19 am
content: Put in white vinegar (food vinegar is ok) brush after 5 minutes and leave for another 5 min, all the corrosion will go away.Rinse with water, ideally distilled water, but tap water will do ok, just rinse later with alcohol and dry with a hair driver or place in the oven at 80°C for 20 min, best with convection fan.

author: Carl E
author_rank: Regular Contributor
timestamp: August 19, 2023, 06:30:21 pm
content: Thank you.The missing part is a SOT 23 with the following marks: Z2P with 1G in smaller letters in the corner. I think this is a zener but have no clue what the value is supposed to be. It is in series with the LED so I would imagine I could use something between 3 and 5V.Any suggestions?

author: Microcheap
author_rank: Frequent Contributor
timestamp: August 19, 2023, 07:44:16 pm
content: This marking code is likely a 5.1V zenerhttps://assets.nexperia.com/documents/data-sheet/BZX84_SER.pdf

author: fzabkar
author_rank: Super Contributor
timestamp: August 19, 2023, 10:27:39 pm
content: http://markingcodes.com/search/c/z2pFWIW, there are some schematics here ...Marantec America Corporation FCC Wireless Applications:https://fccid.io/NKP

author: Carl E
author_rank: Regular Contributor
timestamp: August 20, 2023, 11:15:14 am
content: Thank you to all that replied. Yes, the 5.1V zener works. I now have a FOB for the garage. Querying the FCC website is brilliant.... never thought of it.

author: DavidAlfa
author_rank: Super Contributor
timestamp: August 20, 2023, 11:30:52 am
content: Yeah, the FCC site is a great source of information, almost any electronic device is tested there, often with internalpictures, sometimes even schematics and datasheets.Sometimes the pictures have enough resolution to see the markings, or they make macros of them, so it's a lifesaver when your device blew up and all you have is a crater.Whenever I get a device without readily available docs, that's my first option!