Electronics > Repair
I need help, I got connectors with the wrong Pitch for my board. :(
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HwAoRrDk:

--- Quote from: bassmothership on June 01, 2024, 09:36:47 am ---When you say "AWG maximum of 24", from which number? These wires are AWG 26.

--- End quote ---

As in a wire gauge not physically larger than AWG 24. For AWG, larger number = physically smaller wire. If they're AWG 26 that's fine, because that's one step smaller, but still if solid core it may be problematic.
tooki:

--- Quote from: HwAoRrDk on June 01, 2024, 07:44:52 am ---
--- Quote from: bassmothership on May 31, 2024, 05:17:58 pm ---About crimping PH contacts.
I've found some documentation about JST saying: "As a rule, applicable wires for crimping connector are tin-plated annealed copper stranded wire". Are the wires in my machine applicable for crimping onto?

--- End quote ---

Those wires look like they might be solid core, so not ideal for crimped terminals, but it'll probably work.

--- End quote ---


--- Quote from: wraper on June 01, 2024, 07:51:42 am ---
--- Quote from: pcprogrammer on May 31, 2024, 06:42:28 pm ---But all you had to do was remove the clips pushed onto the base of the connector. The cable would have slipped out no problems what so ever.

And crimping JST style connectors on these cables is not so straight forward. This involves a separate crimp connector per wire and with them close together as is it needs bending the wire which is not good for these solid strands.

You might be able to reuse the old connectors. See if you can clip the top back on the base part with the cable in there and if the connection is still good. If so take them apart again and solder the bases back on the board.

Work on the boards as needed tacking care not to bend the cables to much and when done plug the cables back in with the clips firmly fixing them to the base again.

--- End quote ---
Solid wire cannot be crimped at all with rare exceptions (the only common one is RJ connectors such as RJ-45 used for ethernet, and it's not what you normally think about as crimping). I don't know any connector of this style that allows solid wire crimping.

--- End quote ---


It’s clearly visible in the photo that it’s tinned* stranded wire — you can see the stranding.

With that said, one cannot crimp to tinned* stranded wire, and it’s fiddly to crimp individual contacts to ribbon cable anyway, so I completely agree that if OP does proceed with this plan, they should indeed crimp entirely new harnesses out of individual wires as HwAoRrDk said. But it’s gonna be a lot of fiddly work, and I wouldn’t do it — I’d reinstall the original push-in terminals. (Well, I’d try and find new, identical replacements if possible, to rule out damage caused during desoldering.)


*as in, tinned with solder. This does not refer to individually tin-plated strands, which are often referred to as “tinned” also.
bassmothership:

--- Quote from: HwAoRrDk on June 01, 2024, 10:43:50 am ---
--- Quote from: bassmothership on June 01, 2024, 09:36:47 am ---When you say "AWG maximum of 24", from which number? These wires are AWG 26.

--- End quote ---

As in a wire gauge not physically larger than AWG 24. For AWG, larger number = physically smaller wire. If they're AWG 26 that's fine, because that's one step smaller, but still if solid core it may be problematic.

--- End quote ---

I see. Thank you.
bassmothership:

--- Quote from: tooki on June 01, 2024, 12:49:39 pm ---
--- Quote from: HwAoRrDk on June 01, 2024, 07:44:52 am ---
--- Quote from: bassmothership on May 31, 2024, 05:17:58 pm ---About crimping PH contacts.
I've found some documentation about JST saying: "As a rule, applicable wires for crimping connector are tin-plated annealed copper stranded wire". Are the wires in my machine applicable for crimping onto?

--- End quote ---

Those wires look like they might be solid core, so not ideal for crimped terminals, but it'll probably work.

--- End quote ---


--- Quote from: wraper on June 01, 2024, 07:51:42 am ---
--- Quote from: pcprogrammer on May 31, 2024, 06:42:28 pm ---But all you had to do was remove the clips pushed onto the base of the connector. The cable would have slipped out no problems what so ever.

And crimping JST style connectors on these cables is not so straight forward. This involves a separate crimp connector per wire and with them close together as is it needs bending the wire which is not good for these solid strands.

You might be able to reuse the old connectors. See if you can clip the top back on the base part with the cable in there and if the connection is still good. If so take them apart again and solder the bases back on the board.

Work on the boards as needed tacking care not to bend the cables to much and when done plug the cables back in with the clips firmly fixing them to the base again.

--- End quote ---
Solid wire cannot be crimped at all with rare exceptions (the only common one is RJ connectors such as RJ-45 used for ethernet, and it's not what you normally think about as crimping). I don't know any connector of this style that allows solid wire crimping.

--- End quote ---


It’s clearly visible in the photo that it’s tinned* stranded wire — you can see the stranding.

With that said, one cannot crimp to tinned* stranded wire, and it’s fiddly to crimp individual contacts to ribbon cable anyway, so I completely agree that if OP does proceed with this plan, they should indeed crimp entirely new harnesses out of individual wires as HwAoRrDk said. But it’s gonna be a lot of fiddly work, and I wouldn’t do it — I’d reinstall the original push-in terminals. (Well, I’d try and find new, identical replacements if possible, to rule out damage caused during desoldering.)


*as in, tinned with solder. This does not refer to individually tin-plated strands, which are often referred to as “tinned” also.

--- End quote ---

Once removed from the original headers, the wires can be inserted but only loosely, the headers lost the "locking" system. I guess the process of removing the wires render these headers unusable.
I don't want them anyway, neither I mind how difficult could be to strip and crimp each single cable from the delicate ribbon. I just want to create means to disconnect and separate these two boards so the idea of replacing these board-in headers with the JST'S.

About harnesses, I looked it up and it seems quite confusing to know what I should look for. I don't have the schematics of my machine. What should I use as reference? How can I even buy them? I'm so clueless about this that I don't even know what the questions I should ask.
pcprogrammer:
Keep in mind that JST either XH or PH might have limited mating cycles. There is such a connector in the 1013D for the power connection and during reverse engineering I disconnected it so often that it now has a crappy connection. Especially when you obtain the crimp terminals from cheaper sources.

So if the idea is to have something that you can take a part more often be prepared to redo the connectors every so often.

About the old ones loosing their grip, you could straighten the leads on the flat cable and maybe bend the connectors a bit to give more spring to them.
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