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Typical voltages for troubleshooting
IC's
Pin 1
2
3
U1
1.3
1.3
0
U2/Rx
0
0
0
Mosfets and transistors
Drain
Gate
Source
Q1/Rx
13
0
0
Q1/Tx
0
3 to 8
0
Q2/Rx
0
0
0
Q2/Tx
0
3 to 8
0
Q3/4/6
0
0
0
Tx
9
~2.3
0
Q5/Rx
0
0
0
Q5/Tx
0
3 to 8
0
20m
4
5
6
7
6.8
6.8
8.2
7.9
0
4.5
4.5
4.5
Collector Base
Q7/Rx 0
0
Q7/Tx 8.9
0.8
Page 13 of 13
8
8.33
9
Emitter
0
0.1
digital_txcvr_assembly_030720.pdf
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