Re: No output QCX 40 output drains show 1.6 watts in receive


Alan G4ZFQ
 

In transmit nothing on the IC3 changes.
George,

IC3 looks as if it has failed. If pins 1,2 are high then pin 1 should be low.
What are the voltages on Q1,2,3?

Also it looks as if IC1 is not sending a TX signal to IC3 and that Clk2 is not turned on for TX.
Is it going into TX mode? Does IC1 pin 3 go low when the "Key" switch is pressed?

73 Alan G4ZFQ


IC3 Voltages LCD unplugged:
some values rounded off.
1) 5
2) 5
3) 5
4) .02
5) .01
6) 5
7) 0
8) 5
9) 0
10) 0
 11) 0
12) 5
13) 5
14) 5

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