06-19-2015, 05:17 PM
I have never seen one of these up close, but I have manufactured some parts that resemble the damaged junk.
Just a guess, but the parts marked with "2700" are probably surface mount resistors. Check with a ohmmeter for a value of 2700 ohms.
The array to the left looks like the bases of IRLEDs (infra-red light-emitting diodes), or the matching phototransistors. Under a microscope, you should be able to see where a small chip (about .010" sq) was mounted with conductive epoxy. The other pad is where a fine wire attached to the top of the chip. It was probably originally encased in plastic. This kind of damage usually occurs when the device sees an over voltage, like when current limiting resistors are shorted like with a liquid, (coffee, Coke, tea).
If you have a friend who is a "ham" (amateur radio operator), he may be able to help you work the problem. If you are near Newcastle, there used to be some engineers at Honeywell who might help.
Just a guess, but the parts marked with "2700" are probably surface mount resistors. Check with a ohmmeter for a value of 2700 ohms.
The array to the left looks like the bases of IRLEDs (infra-red light-emitting diodes), or the matching phototransistors. Under a microscope, you should be able to see where a small chip (about .010" sq) was mounted with conductive epoxy. The other pad is where a fine wire attached to the top of the chip. It was probably originally encased in plastic. This kind of damage usually occurs when the device sees an over voltage, like when current limiting resistors are shorted like with a liquid, (coffee, Coke, tea).
If you have a friend who is a "ham" (amateur radio operator), he may be able to help you work the problem. If you are near Newcastle, there used to be some engineers at Honeywell who might help.