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Optic Power Meter Repair

strahd_von_zarovich

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Hi everyone,

I am trying to repair my optic power meter. However, I couldn't find the exact IC which is damaged. I am %95 sure :LOL: It is a TIA. I coulnd't find it's feedback resistor, so probably the gain resistor is inside the chip. Also, there are digital switching ICs on the board, so I think they use different gains for different optic powers, and they do this using digital signals to choose different feedback resistors. Looks like pin-4 and pin-7 are the power pins, because of the decoupling caps, and pin-1 is the -Input pin because it is connected to the diode connection.

Here is the picture of the IC:

R1.PNG


Thanks in advance.
 

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