Conway,
Do you have the heat sink in place? If so, the most probable failure is
a short due either misplaced thermal pads or a bit of metal entrapped in
the pad.
If the heat sink is removed, then you are correct in your assumptions.
Try first removing T3 - then check again. If still present
>What is the most likely souce of my problem? Should I take out T3 and/or
>T4 before rechecking the resistances?
Problem fixed.
I reflowed all the solder joints in the suspect area. When I got to T4,
the problem went away.
tnx.
Conway Yee
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I have just finished the basic construction of the RF board.
Both the base and collector of Q7 fail resistance checks, being near
shorted out (0.1-0.2 ohm). I must have a solder bridge SOMEWHERE,
otherwise unidentified. No obvious bridges noted.
Logically, it should somehow be associated with T3
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