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