Re: HP41C Card Reader Problem Message #2 Posted by Randy on 14 July 2006, 6:54 p.m., in response to message #1 by Andreas Callsen
The LED is in the bottom half, the sensor is on the small circuit board attached to the removable motor module.
The most common problem is to have accidentally bent the LED so it no longer aligns properly with the sensor when assembled. If they are aligned properly, check for fractured solder connections of the LED.
You'll have to remove circuit board for access - start by gently prying off the cap the covers the 12 contacts that mate with the 41 when plugged in. Once the cap is off, you can lift out the card reader electronics module.
The LED is non-visible infrared.
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