Re: Help identify a Zener?



Red Wire, Your schematics were most helpful. I have a question about replacing the NPN BC847 "1H" on a 14LG372-1B Beam Detector Board. DigiKey offers quite a few choices. I could not match up the sizes you listed on your schemo. Could you tell me which DigiKey transistor to get? D3 and The NPN transistor were shorted on my board. I replaced both diodes D1 and D3 with 1N4003. That's what I had lying around. Now to order the little surface mount NPN. Thanks for your help....

Re: Help identify a Zener?

Hello all, I am replying to myself. I just needed to read all of the involved posts to see that Red Wire and others have answered all of my questions on previous pages. I found the exact print I needed. Thank you all for you help.

Re: Help identify a Zener?

Hi Red Wire, I am looking at a 14LG372-1B Detector brd. Did you have a print for that? One of the two diodes (D3) was shorted. I replaced it with a IN4003. From what I can see one of the surface mount components on the rear of the board is shorted too. It has the letters 1H on the three leg device. I am not sure what it is. The Transmit sensor seems to be working. My daughter just bought a house with a 1994 Craftsman opener (139.53636SRT). All wires that go to the opener wall button and both door sensors were cut and removed. The door Detector sensor had...

Re: New Members - please post your introductions here

Hello out there in Bad Cap land!

My name is John and I have been in the Electronics field since 1989. I still do a lot of bench work. Bad capacitors have kept me employed for quite a few years. I work for WGN-TV in Chicago for the past 20 years. Broadcast tape repair is one of my passions. We still run around 30 or so various tape units. Tape storage is slowly diminishing; servers are taking over the world. Luckily, we have a nice variety of electronic equipment to keep me employed and busy. I look forward to reading...