|
When trying the PCB in the supplied case I find I cannot fit it.
There is insufficient clearance for IC7 whatever way or case segment I try.
This is the same for the two kits I have.
IC6 opposite does begin to enter the slot.
Clearance may be made by machining but why is this so?
I could do a photo later but it is obvious if tried (carefully!!)
73 Alan G4ZFQ
|
I think a photo will be necessary. I had zero issues on my QDX, which you can see in part 15 of the series linked below. Does yours not look the same as mine? https://youtu.be/GK37eBYvlp4?t=72 -- Ryan Flowers - W7RLF
|
Yep. Same problem with mine but it will fit into one half ok and then other bit becomes the lid as it were. Not built yet but after seeing posts I chec
ked.
73 Roger G4IUP.
|
Alan,
it will not solve your problem, sorry, but at least, that how it looks like, if all is OK
73's de OE1MWW
Wolfgang
|
Same issue with mine... Going to need to file just a bit off of IC7 package to get it to slide into the case or scoot the chip inwards ever so slightly but will likely opt to take a bit of plastic off of IC7. It won't take much....A few thousandth's of an inch... I can get it to slide in if I pull the case apart just a bit but puts alot of pressure on IC7 when I let it go...
EDIT: I filed off just a bit of material on the offending package plastic, and I mean just a bit and it slides right in now. The IC's lead frame is more exposed but I think it is ok. Most of the material removed is off the upper side of the IC. Might Dremel off just a bit of the case rail just in that location on final assembly.
73
-Mike
?
|
it will not solve */your/ *problem, sorry, but at least, that how it looks like, if all is OK
73's de OE1MWW Wolfgang, Right! I have just checked the other PCB, it is the same. The design clearance is minimal, the cuts in the master board are not quite aligned so the components are off-centre. It is only this IC, I guess a small amount of machining (the case not the IC :-) will get round it. I hope the screw thread will survive. Just seen Mike's suggestion, I was thinking the IC was of a ceramic material but I guess I'm wrong, only some. Filing ICs is not a regular test I do. 73 Alan G4ZFQ
|
Alan,
I hope people that have this issue don't force it cuz it could peel the IC right off the board and pads with it.?
All the IC's on this board are packaged in a thermal plastic and file easily with a Jeweler's file. Ceramic is old hat and typically used where a hermetic seal is required. It is also a lot more expensive than plastic packages.? On a micro scale, these plastic packages are actually a tiny bit porous.?
Looking at this fit issue further, I will definitely dremel out a small bit of the case rail where the tip of the lead frame could contact the case. Some of these IC lead frames are grounded or floating or some other signal and I don't know about IC7 so just to be on the safe side....?
73
-Mike
|
Hey Roger Alan and Mike, would it help to shave off some of the other side of the pc board?? Good luck!? Steve KY4GX.
Glory to God in the highest, and on earth peace, good will toward men. Luke 2:14
On Friday, November 5, 2021, 01:16:23 PM EDT, Alan G4ZFQ <alan4alan@...> wrote:
When trying the PCB in the supplied case I find I cannot fit it.
There is insufficient clearance for IC7 whatever way or case segment I try.
This is the same for the two kits I have.
IC6 opposite does begin to enter the slot.
Clearance may be made by machining but why is this so?
I could do a photo later but it is obvious if tried (carefully!!)
73 Alan G4ZFQ
|
On 05/11/2021 20:32, Steve via groups.io wrote: Hey Roger Alan and Mike, would it help to shave off some of the other side of the pc board? Steve, I am thinking that could make the board loose and not leaving much in the opposite groove. IC7 is just about flush with the board edge. 73 Alan G4ZFQ
|
Hi Steve,
It might in some cases but in my case, both IC6 and IC7 are both pushing up against the rails with IC7 actually butting up against the edge of the rail like in Alan's picture completely preventing it from going any further.... In Wolfgang's pictured, the board is upside down in the case shell looking like there is no issue. All the SMT chips face the bottom of the case when installed correctly.?
Won't get the time to build mine till late next week but did get the inventory done so we are all set but I was curious about this issue so I checked it out.?
Have a great weekend!
73
-Mike
|
IC7 is just about flush with the board edge. Attached picture shows my cut. Done with a cheap Dremel-like tool. About 30 minutes of cutting.. QDX now working although like some others I get some strange self-test results. 73 Alan G4ZFQ
|
I also had this issue with sliding the QDX board in the case due to not enough clearance with one of?the ICs. In my case, a few minutes of careful filing? with a small file allowed the board to slide into place.
73, Gregg W7GRM
>? IC7 is just about flush with the board edge.
Attached picture shows my cut. Done with a cheap Dremel-like tool. About
30 minutes of cutting..
QDX now working although like some others I get some strange self-test
results.
73 Alan G4ZFQ
|
I had this problem,but trying the pcb into both housings from both directions I found one ?combination where the pcb just went in perfectly. I have even seen someone on here file down the offending IC !! Not on.
toggle quoted message
Show quoted text
On 13 Nov 2021, at 16:50, Gregg Myers <gregg.w7grm@...> wrote:
? I also had this issue with sliding the QDX board in the case due to not enough clearance with one of?the ICs. In my case, a few minutes of careful filing? with a small file allowed the board to slide into place.
73, Gregg W7GRM
>? IC7 is just about flush with the board edge.
Attached picture shows my cut. Done with a cheap Dremel-like tool. About
30 minutes of cutting..
QDX now working although like some others I get some strange self-test
results.
73 Alan G4ZFQ
|
I wonder if everyone who is experiencing this is trying the board in both directions using both halves of the clamshell.? I find that there is plenty of clearance in 3 of the 4 possibilities, with only one snagging the slightest amount.? I¡¯m guessing this is a discrepancy in the manufacturing of the clamshell, not the PCB. ? Mike WM4B ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Gregg Myers
Sent: Saturday, November 13, 2021 11:50 AM
To: [email protected]
Subject: Re: [QRPLabs] QDX IC7 fouls case #QDX ? I also had this issue with sliding the QDX board in the case due to not enough clearance with one of?the ICs. In my case, a few minutes of careful filing? with a small file allowed the board to slide into place. ? >? IC7 is just about flush with the board edge.
Attached picture shows my cut. Done with a cheap Dremel-like tool. About
30 minutes of cutting..
QDX now working although like some others I get some strange self-test
results.
73 Alan G4ZFQ
|
Fyi, I tried all orientations of both sides of the case and none of them would fit for me. It appeared that the board cut from the panel had more clearance on one side compared to the other. It ended up being an easy few minute fix anyway.
73, Gregg
On Sat, Nov 13, 2021 at 10:02 AM Mike Besemer - WM4B < mwbesemer@...> wrote: I wonder if everyone who is experiencing this is trying the board in both directions using both halves of the clamshell.? I find that there is plenty of clearance in 3 of the 4 possibilities, with only one snagging the slightest amount.? I¡¯m guessing this is a discrepancy in the manufacturing of the clamshell, not the PCB. ? Mike WM4B ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Gregg Myers
Sent: Saturday, November 13, 2021 11:50 AM
To: [email protected]
Subject: Re: [QRPLabs] QDX IC7 fouls case #QDX ? I also had this issue with sliding the QDX board in the case due to not enough clearance with one of?the ICs. In my case, a few minutes of careful filing? with a small file allowed the board to slide into place. ? >? IC7 is just about flush with the board edge.
Attached picture shows my cut. Done with a cheap Dremel-like tool. About
30 minutes of cutting..
QDX now working although like some others I get some strange self-test
results.
73 Alan G4ZFQ
|
Had the same issue, resolved it by filing a bit of the opposite long side of the PCB. Just a fraction of millimeter was enough. I even managed to put a piece of paper (would have used kapton tape if I had any) just in between the IC and the chassis to prevent any possible short.?
|
Mike Besemer - WM4B
Vojislav [YU4HAK]