This is from a professional scale RM-50 EL(M5), Gram Precision brand. It always complained out of paper.
There's a small optical sensor at paper path that detects it. It's a reflective sensor consisting of an IR LED plus a phototransistor. It detects anything white at 1mm distance.
First I thought that it was just dirtiness (it's from a butcher shop), but cleaning didn't improve. I made a bridge between phototransistor Emitter and Collector to defeat paper sensing while the replacement gets here.
After a lot of research, I deducted that original sensor was a Panasonic CNB10010xL (CNB10010SL for instance). While this sensor is obsolete, I found that Fairchild QRE1113GR is highly compatible. The only difference is flat corner placement in package.
Today I've changed it and it works OK.
There's a small optical sensor at paper path that detects it. It's a reflective sensor consisting of an IR LED plus a phototransistor. It detects anything white at 1mm distance.
First I thought that it was just dirtiness (it's from a butcher shop), but cleaning didn't improve. I made a bridge between phototransistor Emitter and Collector to defeat paper sensing while the replacement gets here.
After a lot of research, I deducted that original sensor was a Panasonic CNB10010xL (CNB10010SL for instance). While this sensor is obsolete, I found that Fairchild QRE1113GR is highly compatible. The only difference is flat corner placement in package.
Today I've changed it and it works OK.
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