Did you load firmware? --n1bs
We are in a hurricane watch and tropical storm ?watch and tornado watch, so to take my mind off the weather, I am trying to get my QMX, Rev 1 going.
I have set my power supply at 7volts and limited current to 200ma. The unit powers on and the LCD turns on but is blank.Brightness does not change when variable resistor adjusted.
I am unable to turn the unit off with a long press on left encoder. I have to turn off bench supply.
I measured voltage on Q103 with encoder off
Gate 6.93
Source 6.68?
With unit on, the bench power supply drops to 5.2v and 198ma (But I can't turn unit off)
Gate 0.00
Source 4.96
Realizing my first problem is not being able to turn the unit off, I checked and touched up connections on encoder (as usual, the tabs broke off during installation and I used component leads to connect broken tab to appropriate hole).? During assembly I had to remove the 2x4 female header on the main board because it wasn't straight. One pin of the female header remained in the hole. I removed that by hand and slipped it back into the header. I checked for continuity between the top pins on control board and the solder pins of the female header on bottom of main PC board so I assume that the female header is ok.
On the 5V power supply board, I touched up the tabs on the 8 pin female header and checked for any possible shorts between those pins and the source and gate of Q103. I had previously clipped these pins slightly shorter.
With bench supply at 8volts (used a higher voltage to see if that might wake up the board), I measured voltage of the pins on top of the female header of ?5V board. Unable to access four pins underneath the board.? Designating the pin closest to the 1/8" jacks as pin 1, here is what I got:
Pin 1 encoder off 7.92 ?on 5
Pin 2 encoder off 0 ?on 1
Pin 3 encoder off 8.0 ?on 5
Pin 4 encoder off 0 ?on 2.16
At this point I am stumped. There is a short somewhere and/or open connection.?I have little electronics theory knowledge, does anyone have any ideas what I should do or would you like to take a look at my unit? (This is about my 6th QRP-Labs kit.)
Thanks in advance.
Phil, K3UT
