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QMX Kit 76444 ordered Aug 14 has the short at Q103 / Q104.

 

Here is the irony. I knew that this was a problem, and I know I should have checked it first or spent the time setting up my regulated power supply, but in my excitement of finishing the kit, I did not and the smoke came out. I have pre-ordered a replacement power supply board, and now I would like to give a go at hot air reworking, something I have no experience with. In the past I made do with a fine tip iron with lots of paste and wick to get them off. However, I now have a board that I can learn with, so I am shopping for an inexpensive hot air rework station, kapton tape and flux pen on Amazon. I also bought an inexpensive Adonstar AD206 microscope and that is a game changer for my ageing eyes. Very pleased with it, and great for removing slivers from my fingers as well.

?Could some kind soul please provide a link to the suggest replacement part for D101 -?1N4148?on Digikey or Mouser?

Thank you,
Jim
VE3ULC
 

Jim,

Try looking on the new C509 group.? I think somebody listed some of those on there.

73
Jim N6OTQ


On Tue, Sep 5, 2023 at 8:44?AM James May - VE3ULC via <ve3ulc=[email protected]> wrote:

?Could some kind soul please provide a link to the suggest replacement part for D101 -?1N4148?on Digikey or Mouser?

Thank you,
Jim
VE3ULC

 

Mornin' Jim:

How many do you need? Just send me your mail address.

Jack, W8TEE
 

Thank you for your assistance Jim and Jack.
The ham radio community is fantastic. Yes, it can have warts at times, but overall it is great.

Jack,
I very much appreciate your gracious offer, and I am willing to compensate you for your time and expenses, or at the very least try to do something in kind for you.?I have one kit to repair at the moment, but a good friend of mine, Rick VE3ORY may have a similar problem and I volunteered to work on his as well. Would I be asking too much for two 1N4148s?? I sent you an email from the address on your QRZ page.

Again, I very much appreciate the help guys,
Jim
VE3ULC
 

Definitely want to check Q103/Q104. My QMX kit was shipped 8/24, and it had the short. I haven't started building yet, but I did fix the short by using a hot air rework station, and nudging over Q103 (the big one). --n1bs


On Tue, Sep 5, 2023 at 12:09?PM James May - VE3ULC via <ve3ulc=[email protected]> wrote:
Thank you for your assistance Jim and Jack.
The ham radio community is fantastic. Yes, it can have warts at times, but overall it is great.

Jack,
I very much appreciate your gracious offer, and I am willing to compensate you for your time and expenses, or at the very least try to do something in kind for you.?I have one kit to repair at the moment, but a good friend of mine, Rick VE3ORY may have a similar problem and I volunteered to work on his as well. Would I be asking too much for two 1N4148s?? I sent you an email from the address on your QRZ page.

Again, I very much appreciate the help guys,
Jim
VE3ULC

 

I would like to add an update.

I ordered an inexpensive hot air rework station from Amazon, and that combined with the microscope mentioned previously, I was able to closely check the condition of all of my solder joints, look for any solder bridges, and then finally use the hot air gun to remove Q103 and clean up the short at Q103 / Q104. Yes it was there.

I would also like to thank Jack W8TEE for his generosity and I received his package in the mail today of a replacement D101 - 1N4148 and soon had it installed, doubled check and powered up. So far all is working great. So far I have only received CW, so next is checking the filters, and then testing a digital mode. Looking forward to an AGC.



73
Jim
VE3ULC

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