Re: Help identify a Zener?
After measuring some voltages, I found: The 8 pin LM2903 has pins: 1=5v 2=4.8V 3=3.3V 4=0 5=2.24V, 6=0V, 7=1.68V and 8=5.6V - when I scoped the the IC and the Transistor driving the IR LED it had no pulses, the Base was 160mv, Collector is 880mv and emitter is 140mv. I think is not being driven by the IC with enough and no 38K frequency pulse. D106 looks good. I guess the IC got fried. I think my next step is to replace the LM2903. I will try the REMOTE trick (Redwire) to see if the receiver lights up!
After measuring some voltages, I found: The 8 pin LM2903 has pins: 1=5v 2=4.8V 3=3.3V 4=0 5=2.24V, 6=0V, 7=1.68V and 8=5.6V - when I scoped the the IC and the Transistor driving the IR LED it had no pulses, the Base was 160mv, Collector is 880mv and emitter is 140mv. I think is not being driven by the IC with enough and no 38K frequency pulse. D106 looks good. I guess the IC got fried. I think my next step is to replace the LM2903. I will try the REMOTE trick (Redwire) to see if the receiver lights up!
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