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ribbon cable repair

 

When I was reinstalling the MAIN board, I noticed that some of the conductors had lifted from the ribbon cables.? I squeezed them down, flattened them out and got them into the sockets anyway.? The TX adjustment did not go well (see thread about interpreting adjustment instructions).? Today I pulled them out of J2004 and J2005 and found that two conductors may have contacted each other.? That's very consistent with Andrew's comment that I have a ribbon cable fault.?
One one cable, some of the conductors have delaminated only in the first 2 mm from the end of the cable.? Is there enough contact area in the connector mechanism that I could just cut the first mm of the cable and its stiffener off so that the delaminated conductor doesn't fold back or sideways and cause a problem and then plug it in?
Elsewhere I've found advice to superglue the conductors back down.? So I'll try that on the ones that have a longer delamination region.?
If this fails, are these cables something I would have to order from Icom?? Or are there standard conductor pitches on such cables, in which case I could order some material from DK or Mouser, cut the length and width I need, scrape the paint of the conductors at the end, and possibly glue a stiffener to the end, too?
This is probably the most modern radio I've tried to repair.? I don't yet know much about these flexible ribbon cables.? I'm used to the ones made from individual, insulated, stranded wire with 0.5 inch pitch.
Halden VE7UTS
 

I ordered some from ICOM for a friend less than a year ago. As you can see, you need a spare.
Bob W4JFA?

On Sat, Apr 12, 2025, 3:40 PM HF via <incorridge=[email protected]> wrote:
When I was reinstalling the MAIN board, I noticed that some of the conductors had lifted from the ribbon cables.? I squeezed them down, flattened them out and got them into the sockets anyway.? The TX adjustment did not go well (see thread about interpreting adjustment instructions).? Today I pulled them out of J2004 and J2005 and found that two conductors may have contacted each other.? That's very consistent with Andrew's comment that I have a ribbon cable fault.?
One one cable, some of the conductors have delaminated only in the first 2 mm from the end of the cable.? Is there enough contact area in the connector mechanism that I could just cut the first mm of the cable and its stiffener off so that the delaminated conductor doesn't fold back or sideways and cause a problem and then plug it in?
Elsewhere I've found advice to superglue the conductors back down.? So I'll try that on the ones that have a longer delamination region.?
If this fails, are these cables something I would have to order from Icom?? Or are there standard conductor pitches on such cables, in which case I could order some material from DK or Mouser, cut the length and width I need, scrape the paint of the conductors at the end, and possibly glue a stiffener to the end, too?
This is probably the most modern radio I've tried to repair.? I don't yet know much about these flexible ribbon cables.? I'm used to the ones made from individual, insulated, stranded wire with 0.5 inch pitch.
Halden VE7UTS
 

Hi switch on select VHF and measure the voltsge on the gate, if the bias is set low there should be low volts on the gate. Check the spec of the transistor, and check where it is, most RF Fet's turn on between 3 and 4 bolts.

KR

Andrew

Get
On 12 Apr 2025, at 21:57, "Bob via " <gmail.com@groups.io target=_blank>[email protected]> wrote:

I ordered some from ICOM for a friend less than a year ago. As you can see, you need a spare.
Bob W4JFA?

On Sat, Apr 12, 2025, 3:40 PM HF via <incorridge=[email protected]> wrote:
When I was reinstalling the MAIN board, I noticed that some of the conductors had lifted from the ribbon cables.? I squeezed them down, flattened them out and got them into the sockets anyway.? The TX adjustment did not go well (see thread about interpreting adjustment instructions).? Today I pulled them out of J2004 and J2005 and found that two conductors may have contacted each other.? That's very consistent with Andrew's comment that I have a ribbon cable fault.?
One one cable, some of the conductors have delaminated only in the first 2 mm from the end of the cable.? Is there enough contact area in the connector mechanism that I could just cut the first mm of the cable and its stiffener off so that the delaminated conductor doesn't fold back or sideways and cause a problem and then plug it in?
Elsewhere I've found advice to superglue the conductors back down.? So I'll try that on the ones that have a longer delamination region.?
If this fails, are these cables something I would have to order from Icom?? Or are there standard conductor pitches on such cables, in which case I could order some material from DK or Mouser, cut the length and width I need, scrape the paint of the conductors at the end, and possibly glue a stiffener to the end, too?
This is probably the most modern radio I've tried to repair.? I don't yet know much about these flexible ribbon cables.? I'm used to the ones made from individual, insulated, stranded wire with 0.5 inch pitch.
Halden VE7UTS

 

Oops, I should have written 0.05 inch pitch.
Well, my attempt to repair that cable only made it worse.? I glued the strips down, scraped off the extra glue, reassembled, and the radio wouldn't even turn on.? Verified 3V at PWRK so the 14V was getting through.? Took another look at the flat cables and found that they still had some glue residue.? While scraping that off, the cable came out of the socket on the PA board down below.? Glue removal caused conductor removal, so I tried scraping off that white stuff and shortening the cable, having noted that the cable is probably about 1 cm longer than it needs to be.? I learned of a few techniques that didn't work and now the cable is too short to fit anyway.? Time to search it up.? It turns out that this stuff is called "flat flexible cable" and is available in various standard pitches and lengths.? This one and the one next to it each have 28 conductors, are 58 mm long, and conductor pitch is 0.5 mm.? It turns out to be available at Tayda, Aliexpress, Amazon, and Newark, but not Digikey.? I ordered some 10-cm 60-conductor pieces on AE.? Cutting it down to 28 conductors should be easy.? If I don't come across a reliable technique for shortening the cable, I'll stuff the extra 4 cm in somewhere or curl it up above the connector.? That should be about 3 weeks from now.? Thanks, Bob and Andrew, for your comments!
Cheers,
Halden
 

I just order new cables from Icom, they were less than a ?1 each, I now have stock for the next IC7000 that comes my way

KR

Andrew

Get
On 13 Apr 2025, at 19:20, "HF via " <yahoo.com@groups.io target=_blank>[email protected]> wrote:

Oops, I should have written 0.05 inch pitch.
Well, my attempt to repair that cable only made it worse.? I glued the strips down, scraped off the extra glue, reassembled, and the radio wouldn't even turn on.? Verified 3V at PWRK so the 14V was getting through.? Took another look at the flat cables and found that they still had some glue residue.? While scraping that off, the cable came out of the socket on the PA board down below.? Glue removal caused conductor removal, so I tried scraping off that white stuff and shortening the cable, having noted that the cable is probably about 1 cm longer than it needs to be.? I learned of a few techniques that didn't work and now the cable is too short to fit anyway.? Time to search it up.? It turns out that this stuff is called "flat flexible cable" and is available in various standard pitches and lengths.? This one and the one next to it each have 28 conductors, are 58 mm long, and conductor pitch is 0.5 mm.? It turns out to be available at Tayda, Aliexpress, Amazon, and Newark, but not Digikey.? I ordered some 10-cm 60-conductor pieces on AE.? Cutting it down to 28 conductors should be easy.? If I don't come across a reliable technique for shortening the cable, I'll stuff the extra 4 cm in somewhere or curl it up above the connector.? That should be about 3 weeks from now.? Thanks, Bob and Andrew, for your comments!
Cheers,
Halden

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