| Electronics > Repair |
| Looking For Small Barcode Reader ICs |
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| fmashockie:
Hello EEV Blog! I am in the process of attempting to repair a piece of lab equipment at work. It is a PerkinElmer Envision 2104 plate reader. The unit has a ton filters and mirror modules. All these filters and mirror modules are barcoded so the instrument can recognize which ones are installed and in use. However, one of these barcode readers is having an issue. The mirror modules sit on a wheel that rotates (think like a cd changer or something). It uses a small barcode reader IC to both read the barcodes on the mirror modules and to home itself to the zero position. After extensive troubleshooting I am pretty confident the barcode reader is faulty. It is a 4-pin IC. It had no identifying markings until I desoldered it and found 'Shinkoh Elect' on the bottom. I looked up their website and found what is likely the IC. It is called the KR1228 https://www.shinkoh-elecs.jp/en/technology/feature/ According to their website, it is a red 'LED and phototransistor' combined. I have yet to reach out to the company for availability, but I was wondering if anyone is familar with ICs like this. I couldn't find anything like it on Mouser or Digikey (maybe I wasn't using the correct search terms?). It would nice to have alternatives to the KR1228 in the event the manufacturer cannot provide in small quantities. If anyone could help point me in the right direction I would greatly appreciate it! I attached some photos of it as well. The alternative has to be a 4 pin IC LED/phototransistor like this. Thanks! -Frank |
| Whales:
Looks like an LED and phototransistor. AKA a "reflective IR sensor". It probably doesn't have any brains in it, but it's a part that's known to go bad in a lot of things. If you can't find a replacement with the same footprint then you might be able to replace it with a 3mm IR LED and a 3mm IR phototransistor cleverly positioned and bent. |
| fzabkar:
https://www.sensorinstock.it/en/photo-reflector/541-kr1228.html https://www.shinkoh-elecs.jp/wp-content/uploads/2015/07/C_KR1228_1229_20B.pdf (datasheet) |
| tooki:
--- Quote from: Whales on June 08, 2024, 03:52:34 am ---If you can't find a replacement with the same footprint then you might be able to replace it with a 3mm IR LED and a 3mm IR phototransistor cleverly positioned and bent. --- End quote --- You need optics to focus on a single spot, or a slit to accomplish the same (and then, only if it’s in very close contact). Otherwise you’re getting the unfocused result of the entire illumination area, which is useless for reading a bar code. |
| fmashockie:
--- Quote from: fzabkar on June 08, 2024, 04:06:49 am ---https://www.sensorinstock.it/en/photo-reflector/541-kr1228.html https://www.shinkoh-elecs.jp/wp-content/uploads/2015/07/C_KR1228_1229_20B.pdf (datasheet) --- End quote --- You are the king of finding/identifying components. Thank you so much for this! |
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