Eduardo,
Do you have any voltage at the emitter of Q11? Is that voltage getting
to U6 pin 5 (measure on the leg of U6 instead of at the socket).
Check U6 pin 5 - it could be bent under the chip or on the outside of
the socket.
If the voltage at Q11 emitter is zero, then check the differential
voltage between pins 2 and 3 of U3. That differential voltage should
result in a small voltage at U3 pin 1.
Check R7 and R8 for good soldering.
73,
Don W3FPR
Eduardo Jacob wrote:
Hi
A friend of mine is having problems with the current detector. When he
presses the display button the voltage is displayed but the current
shows 0.
We have been tracing the circuit which is fairly straight and we are not
able to get the solution. We have changed the LM833 and the PN2222A
transistor. We have checked the current sense resistor and it seems it's
working. Does any body found before this problem?
Regards
Eduardo/EA2BAJ
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