Please Help ID this SMD IC - Page 1
Forum section: electronics / repair

author: ReWind James
author_rank: Newbie
timestamp: February 08, 2024, 01:21:15 am
content: I'm repairing a loop switcher pedal for guitar. It's basically an analog patch bay which selects any combination (or just one at a time, depending on settings) of 6 different audio in/out loops between the guitar and amplifier. It's called a "GigRig Quartermaster 6". It has a dead channel. I diagnosed it down to this IC, shown below, which had a leg nearly (and now fully) broken off. It intermittently worked when I poked at it with a chopstick, after which I noticed it had almost nothing left of the top left leg. Must have been damaged during the initial install?Best I have figured, it's a differential amplifier used for switching but I'm not really sure. I usually work with bigger and older gear. I found some ICs with "02WY" in the part name, but they are all 8 pin or more. This one is a 6 pin.I can't find anything on Mouser or Digikey that matches the text on the IC or the text on the board under it. I've tried so far:02WYO2WYQ2WY02HMO2HMIt's probably something common and if I was more familiar with these sort of parts I would know just what to do. Each channel on this switcher has one. I'd hate to loose this whole unit over this little part. The Quartermasters are out of stock everywhere and backordered from the manufacturer and mine is second hand, out of warranty.Any idea what it, or its equivalent, is? It was located at "IC6" on the board. About the size of a half-grain of rice.This is a bit out of my wheelhouse, but I can do it if I can get a replacement.Manufacturer's product infohttps://www.thegigrig.com/quartermasterThanks for any help!

author: amyk
author_rank: Super Contributor
timestamp: February 08, 2024, 01:29:40 am
content: If you are really careful you may be able to grind back the epoxy package enough to get to the leadframe and solder onto that.The marking matches a PIC10F202 microcontroller. Where do the pins lead? Are the two middle pins a power supply?

author: fzabkar
author_rank: Super Contributor
timestamp: February 08, 2024, 02:01:33 am
content: Quote from: amyk on February 08, 2024, 01:29:40 amThe PCB is marked "02HM". That's a PIC10F202-I/OTG, as you say (02nn).https://www.rapidonline.com/microchip-pic10f202-i-otg-microcontroller-73-1954https://ww1.microchip.com/downloads/en/DeviceDoc/40001239F.pdf(marking info on page 75)Capacitor C56 is connected between Vcc and ground.

author: ReWind James
author_rank: Newbie
timestamp: February 08, 2024, 02:31:18 am
content: Excellent! Thank you so much.If I may ask a couple questions, and please forgive my ignorance...I can't find a part available with the G suffix or what that G designates in the data sheet. Is this "PIC10F202-I/OT" a suitable replacement?https://www.microchipdirect.com/product/PIC10F202-I/OT?productLoaded=trueAlso, I see the part contains some internal memory. This is a bit more advanced of a device than I expected. Is this something that needs to be programed before using it or is that memory just for internal use? Basically, do you think this is a drop in part?The product I'm working on is very simple (seemingly). There's no digital connections, screen or interface other than one latching and one momentary push buttons for each channel / loop. I thought it was entirely analog and relay based but this seems a little deeper than that.Thank you again for your help and I apologize if I'm a little over my head on this project. I'm capable, this is just new technology from what I'm generally experienced with.

author: cruff
author_rank: Regular Contributor
timestamp: February 08, 2024, 03:28:13 am
content: I've successfully removed part of the package on a memory IC to expose the lead frame to restore connectivity to a pin. It's definitely doable with some care and a small Dremel bit.

author: fzabkar
author_rank: Super Contributor
timestamp: February 08, 2024, 04:09:06 am
content: The PIC would need to be programmed. :-(

author: amyk
author_rank: Super Contributor
timestamp: February 09, 2024, 12:56:13 am
content: Quote from: ReWind James on February 08, 2024, 02:31:18 amIf you can't fix the existing PIC enough to solder it in place and its only purpose is to make a latching pushbutton, writing a suitable replacement firmware would be trivial. It only has 6 pins, and 2 of them are for power, so where do the other 4 go?