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USB Device not recognized .... another one

#qmx

Rick Williams - VE7TK All Messages By This Member #108218 Well I have completed my 12VDC QMX. I have it connected to a current limited power supply set at about 25 mA at 9VDC (yes I'm paranoid). I have a power meter and dummy load on the BNC output. The LED backlight pot is at about 50% I plugged in the USB cable BEFORE switching on the power supply and immediately Win10 gave my the dreaded USB Device not Recognized. When I switch on the Power supply no current is drawn and there is 9 VDC on the power connector on the PC board. Similarly a long push of the left encoder yields no current drawn. (This is a good thing -- hi!) I have tried 3 USB cables. Two get no reaction from my PC and one gets the USB error message. None of the cables yield ANY reaction on a Linux PC? I'm not sure what's happening? I assume that applying power to the QMX should cause it to enter and or display Update firmware. Is a long press of the left encoder required for that to be displayed? Is is displayed on the LED display or on the computer? The "flaky-ness" of the USB cables has me leaning toward a USB cable problem some have encountered. I have successfully updated the firmware on my QLG2 but it uses a different USB cable. So, am I correct in assuming that - IF I have a faulty USB cable, the USB device will not be found, no bootloader will be installed, the backlight will stay off, and without firmware the QMX will draw no current? Have I misinterpreted something. Some comments on this site suggest that the QMX will turn on (no LED display) and draw current (~150 mA) without a USB cable attached when the left encoder is given a long push?? Finally, the USB-C connector on the main PCB looks a little dicey! (Photo attached) Thoughts appreciated. Thanks! -- 73, Rick VE7TK Website:
Paul - AI7JR All Messages By This Member #108222 开云体育 25 mA is not enough. Hans suggests 250 mA and 7 volts somewhere... I set my current to about 180 mA and it came up. 73, Paul -- AI7JR On 8/23/23 21:18, Rick Williams - VE7TK via groups.io wrote: toggle quoted message Show quoted text Well I have completed my 12VDC QMX. I have it connected to a current limited power supply set at about 25 mA at 9VDC (yes I'm paranoid). I have a power meter and dummy load on the BNC output. The LED backlight pot is at about 50% I plugged in the USB cable BEFORE switching on the power supply and immediately Win10 gave my the dreaded USB Device not Recognized. When I switch on the Power supply no current is drawn and there is 9 VDC on the power connector on the PC board. Similarly a long push of the left encoder yields no current drawn. (This is a good thing -- hi!) I have tried 3 USB cables. Two get no reaction from my PC and one gets the USB error message. None of the cables yield ANY reaction on a Linux PC? I'm not sure what's happening? I assume that applying power to the QMX should cause it to enter and or display Update firmware. Is a long press of the left encoder required for that to be displayed? Is is displayed on the LED display or on the computer? The "flaky-ness" of the USB cables has me leaning toward a USB cable problem some have encountered. I have successfully updated the firmware on my QLG2 but it uses a different USB cable. So, am I correct in assuming that - IF I have a faulty USB cable, the USB device will not be found, no bootloader will be installed, the backlight will stay off, and without firmware the QMX will draw no current? Have I misinterpreted something. Some comments on this site suggest that the QMX will turn on (no LED display) and draw current (~150 mA) without a USB cable attached when the left encoder is given a long push?? Finally, the USB-C connector on the main PCB looks a little dicey! (Photo attached) Thoughts appreciated. Thanks! -- 73, Rick VE7TK Website:
Paul - AI7JR All Messages By This Member #108223 开云体育 Have I misinterpreted something. Some comments on this site suggest that the QMX will turn on (no LED display) and draw current (~150 mA) without a USB cable attached when the left encoder is given a long push? If you haven't loaded the firmware yet, it will come up in Update mode--it won't wait for any key press. ;-)
Rick Williams - VE7TK All Messages By This Member #108224 Thanks for getting back Paul. You are correct! In my case it should then trip the current limited supply. However, the QMX doesn't draw current at any time and never goes over my pre-set limit? To confirm, when I apply power to the 2.1mm connector and long press the left encoder, the QMX should go into into Update mode whether it's connected to the PC via? USB cable or not? -- 73, Rick VE7TK Website:
Rick NF6G All Messages By This Member #108227 On Wed, Aug 23, 2023 at 09:18 PM, Rick Williams - VE7TK wrote: ?The LED backlight pot is at about 50% Turn that backlight pot completely counterclockwise to start. Ideal contrast might be a hair off of full left, but anything beyond that is blank screen territory. 50% is definitely a blank screen. As Paul mentioned, you've got to give it more juice. 25mA is way too low.? I started mine with the 250mA and 7V that Hans recommended. When I saw things were working, I went up to 11V. And soon after that, I just put it on my LiFePO4, no problems for me operating at 13.3V and even more than that, through a properly matched balance line fed antenna.
Paul - AI7JR All Messages By This Member #108315 开云体育 That, I don't know... On 8/23/23 22:34, Rick Williams - VE7TK via groups.io wrote: toggle quoted message Show quoted text Thanks for getting back Paul. You are correct! In my case it should then trip the current limited supply. However, the QMX doesn't draw current at any time and never goes over my pre-set limit? To confirm, when I apply power to the 2.1mm connector and long press the left encoder, the QMX should go into into Update mode whether it's connected to the PC via? USB cable or not? -- 73, Rick VE7TK Website:
Rick Williams - VE7TK All Messages By This Member #108346 Thanks Rick. I set the supply to 25mA wholly expecting it would immediately trip at the excess current demand of the QMX. BUT the power supply did not trip nor did the meters move off of the peg. So that indicates that no electrons are flowing from the 9VDC supply into the QMX. -- 73, Rick VE7TK Website:
Rick Williams - VE7TK All Messages By This Member #108347 I have done some more testing and there is power to pin 5 (V_IN) of the Plug-in PCB #1. However, when a long hold of the left encoder is pushed there is no output on on pin #6 of this board. So for some reason Q103 and Q105 are being turned on. I'll take a look at the PWR_ON line with the scope when I'm back from my birthday lunch -- hi! PS: Somewhere on the group Hans described the power on sequence for the QMX. Can someone please send me the link to that message - thanks! -- 73, Rick VE7TK Website:
Rick Williams - VE7TK All Messages By This Member #108368 On Thu, Aug 24, 2023 at 01:06 PM, Rick Williams - VE7TK wrote: oops ..... So for some reason Q103 and Q105 are NOT being turned on ? -- 73, Rick VE7TK Website:
Kees T All Messages By This Member #108376 Rick, That would make a difference. I assume you also don't have 5V VCC nor 3.3V VDD then But back to the "no USB" : Looking at the USB connector pins in your picture, I would say at least 2 pins need to be re-soldered. Having the pin contact the via barrel and soldered to the barrel is fine but those 2 appear to be really centered in the via barrel hole and the pins are quite small (and short). This will vary from USB connector to USB connector since the locator pins have room to move a little during assy. What I would recommend is use solder flux (flux pen) and carefully touch each pin (maybe use a toothpick) then use a bit of solder. What you want to do is have the surface tension of the solder to the pin/via barrel draw the solder into the via barrel. Use very little solder and check for unwanted shorts between the surface pads. Only?SOME?of the USB pins are actually used so you might assume it's OK......but it depends on the pin. 73 Kees K5BCQ 73 Kees K5BCQ ?
Rick Williams - VE7TK All Messages By This Member #108379 SUCCESS!! I resoldered the encoder switches and I was able to get electrons to flow. About 170 mA at 9 VDC (wired for 12 VDC).? The USB port was still not recognized so I gingerly resoldered it. Still no USB port recognized by Win10. But I'm getting closer.? Finally I tried another USB cable and this time SUCCESS!!! The little QMX booted to 7.074 MHz CW! The QMX is up and running. I'll do some TX and RX tests tomorrow, but today has been a good day. (Even though I got older - hi!) Thanks to all who gave me some help! -- 73, Rick VE7TK Website:
Kees T All Messages By This Member #108384 Rick, Great to hear about your success. However................ Here is a little more about the USB-C connector. The connector is designed around 8 pins and the shields. The connector is designed to accept a USB-C plug which can be plugged in right side up OR?upside down. The connector has 2 rows of 8 pins? on both the top and the bottom of that center insulator. Of course, one goes left to right and one goes right to left ......makes sense. I believe that Hans wired identical pins together between the 2 rows. This would increase the probability of making a connection to the few pins actually used but it does not fix the problem.? I even saw a picture of someone who had added 16 solder balls to his USB-C connector.? However, you can't see how well the solder has wicked to the very short pin, so maybe. A much more solid connection can be had with the "toothpick and flux technique" described in my other note. That way you can SEE to solder wicked from the pin to the via barrel. When I examined my kit USB-C connector the 16 pins are all helter skelter inside the via barrels. Some look like they picked up a small dab of solder out of the plated barrel, some were touching, some were not. Talk about "iffy connections". Manufacturers typicall do not use solder paste screening on PIH parts. No wonder there are multiple? USB-C download tries, may require a new (flipped) USB-C plug, may require a little connector wiggling, etc. The net is that it may have an "iffy" contact and may fail later.? A GOOD, much more solid, connection can be had with the "toothpick and flux technique" described in my other note.? 73 Kees K5BCQ .
Rick Williams - VE7TK All Messages By This Member #108451 Thanks for getting back Kees. I flooded the area with flux and then used a T12 - JL02 tip. It is about the size of a tooth pick - hi! It must have worked since the firmware update was successful! Still having some issues with the control board push buttons and right encoder. BUT at least the QMX is booting up. -- 73, Rick VE7TK Website:
Bruce KG8IW All Messages By This Member #108460 The right encoder / button problems are likely a bad ground - upper left pin on the control board if I remember right.? ?Recheck that one, that six layer? ground takes a lot of heat.??
Rick Williams - VE7TK All Messages By This Member #108478 IT's ALIVE!!! The QMX hears and transmits as well! (Ironically the 1st thing it heard was from the QRP-Labs SigGen!) On transmit without any adjustments at ~12VDC? into my QRPoMeter dummy load I measured: 80m?? 4.1W 60????? 4.0 40????? 4.1 30????? 3.7 20????? 3.5 Now to start setting the rig up!! I may even need to print out the operating manual! -- 73, Rick VE7TK Website:
Kees T All Messages By This Member #108530 Hans has a good picture of the USB-C connector in the video he just posted? and it clearly shows the the solder wicking between the 16 pins and the associated via barrels as discussed in my previous notes. This is mandatory if you don't want "iffy" USB-C connections over the life of this wonderful product. You may find that the 16 pins on your USB-C connector have a whole lot less solder, or none. You need a solid USB-C interface for all the QMC product improvements and additions. Be careful adding flux and a dab of solder. Take your time. By the way, the 16 pin USB-C means it is a Rotationally Symmetrical Connector and the plug can be inserted either way.? 73 Kees K5BCQ??

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