Re: 40M QCX problem uponpower up
Alan de G1FXB
Hi nz0tham,toggle quoted messageShow quoted text
Han's voltage table T1 pins 5, 6, 7 & 8 2.36 volts
your check T1 pins 5,6,7,8 all 0.30
Assembly Manual Section 5.5 explains circuit.
R1 & R2 are both 10K Ohms configured as as a voltage divider.
You have approx 5v on the top end of R2?
There SHOULD be approx half voltage junction R1 & R2
0 Ohm continuity from the other end of R1 to 0V rail connection
how does the voltage divider check out?
next possibles, T1 secondary winding continuity 1 & 2 or IC4 internal s/c pin 7/9 to 0V (unlikely)?
On 16/02/2018 00:49, nz0tham@... wrote:
I measured voltages using the internal DVM. I did not measure the LCD because it works fine. Many of these are way off - I hope a better tech than me sees a pattern here! Sorry for the long post.