开云体育

On Wed, Apr 10, 2024 at 11:41 AM, Wayne Greene

<wayne.greene489@...> wrote:

RESOLVED!! and I feel like an idiot. Thanks, Ludwig. After continued troubleshooting, I decided to just resolder the pushbutton pins. That fixed it. I must have had a cold solder joint.

I cannot thank you all for your help. Thank you all so much for your patience and advice.

73,

Wayne KB4DSF

On Wed, Apr 10, 2024 at 10:16?AM <DH8WN@...> wrote:

Hello Wayne,

all the voltages on your image are ok for no button is pressed. I think all the header contacts are connected well to the main PCB.

If pressing one of the small buttons or the right encoder (here called the three buttons) on one pin the voltage must be lower.
So please have a look on the schematic_rev2.pdf page 3.
JP302 is "your" pin header. Contact 7 is GND. So you have the reference to your picture.
Contact 6 is important for the three buttons. On the main PCB it's connected via 2.2 kOhm to VDD (3.3 V).
If no button is pressed you see 3.3 V at the pin.
If one of the buttons is pressed, pin 6 should be connected via one of the resistors R301, R302 and R303 to GND. This forms a voltage divider and the voltage at pin 6 is lower than 3.3 V. The value depends on the value of the switched resistor. (So the controller knows which button is pressed.)
If no button is working, something is wrong between GND and pin 6. I guess either the connection of all buttons to pin 7 (GND) or the connection of the three resistors to pin 6.

You should find it easy using the DMM. For save operation remove the Controls board PCB from the QMX and check resistance of the two mentioned connections.

Hope this will help.

73, Ludwig

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Wayne Greene