Master keyboard IDC connector

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robert24
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Master keyboard IDC connector

Post by robert24 » Wed Nov 08, 2017 7:38 pm

So got the Master 128 out and powered up. Noticed that the LEDs weren't working and found some cracked PCB tracks. Tried to solder across and eventually had to solder some wire across. Got them to work (very inelegantly) but found that we had broken the IDC connectors from the little PCB. The cable has gone very stiff.

Is this something we can source ? some more 15 wire IDC cable and the end connectors, maybe we can try to open and reuse the existing connectors, anyone got a complete keyboard with cables that they don't need?

Any advice welcome. Otherwise it's probably another job for Mark at RetroClinic (luv his service but it's getting to be an expensive hobby)
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danielj
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Re: Master keyboard IDC connector

Post by danielj » Wed Nov 08, 2017 7:50 pm

What I would do is desolder what's there, clear the holes out, trim the plastic back slightly (2/3mm - enough to get the ends of the wires through the holes and to the pads), and then resolder it. I'll just be brittle at the end where it was flexing against the PCB. It'll be fine inside the sheath. Does that sound like something you'd be OK doing? Take it slow! You'll need a solder sucker and desoldering braid.

d.

crj
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Re: Master keyboard IDC connector

Post by crj » Wed Nov 08, 2017 9:29 pm

If you want a new ribbon cable, they can still be got. That's a 20-way, but I expect it would be trivial to trim down to size.

Alternatively, a less elegant but more straightforward option might be to invest in a pack of these.

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robert24
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Re: Master keyboard IDC connector

Post by robert24 » Fri Nov 10, 2017 10:58 am

Thanks for your responses. Both useful. Will let you know if we succeed.
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Prime
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Re: Master keyboard IDC connector

Post by Prime » Fri Nov 10, 2017 11:47 am

What I tend to use for things like this as I have an absolute metric buttload of old floppy & IDE cables, is a single row pinheader on the keyboard and then an appropreate sized cable plugged into it as long as you use the same side on both ends and align them to the same end of the connector it works absolutely OK.

Much less hassle than soldering wires to the board, especially as I tend to have my machines apart quite frequently so soldered joints would just break again :(

Cheers.

Phill.

crj
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Re: Master keyboard IDC connector

Post by crj » Fri Nov 10, 2017 1:08 pm

I agree that using a 0.05"-pitch ribbon cable with double-row connectors as a substitute for a 0.1"-pitch with single-row is normally fine.

Unfortunately, space is pretty tight for the Master's keyboard ribbon cables...

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robert24
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Re: Master keyboard IDC connector

Post by robert24 » Fri Nov 10, 2017 10:33 pm

Prime wrote:a single row pinheader
could you point me towards a supplier web page for such an item ? We find finding what we want is very different from knowing what we want.

plus... can I too get "an absolute metric buttload" ? is that different from an Imperial buttload (absolute or relative) ?

The more we look at it the more we're thinking about choosing packaging for a trip to haysman land.
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Prime
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Re: Master keyboard IDC connector

Post by Prime » Sat Nov 11, 2017 1:21 am

robert24 wrote:
Prime wrote:a single row pinheader
could you point me towards a supplier web page for such an item ? We find finding what we want is very different from knowing what we want.
Something like these :

https://www.rapidonline.com/truconnect- ... ug-22-0545

Or the right-angle ones :

https://www.rapidonline.com/bkl-1012018 ... ed-50-8030

Note I just buy the 36 way ones and cut them down to the required length, but you can get them in other sizes.

Cheers.

Phill.

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