Hi Guys,
Thanks for the replies. The first thing I thought to do was re-seat the
boards and I did. Well, I didn't re-seat the ones that were hidden under
the display board (DR-7). I'll take it apart and re-seat them if I have
to, but, I think I have isolated the problem to the pre-driver board and it
doesn't plug into anything. It is bolted to a heatsink next to the PA.
When it is in a failed condition, I have RF going into, but not out of,
the pre-driver board.
Thanks for the offer, but I already have a set of extender boards.
I will find the problem eventually , I just need a schematic. I will
take another look at Ron's site.
Thanks again,
Bob K6GGO
Hi Bob:
Before jumping right to looking for a flaky component, have you done
the requisite re-seating of the board? Deoxit on the edge connector,
and relay cleaning?
FWIW
Curt
KU8L
On 12/20/2011 3:15 PM, Robert Fish wrote:
Hi Guys,
I have a two part question. I noticed a few weeks ago that, on
occasion, my TR-7 would not transmit when keyed. If I unkey and then
key again, it would transmit.
I noticed when running digital modes, which I do using VOX for keying
the transmitter. Well, the last few days it has become more frequent.
It also happens in cw.
If I key the transmitter 10 times, maybe 3 or 4 times Ill get no RF
out. I traced the problem to the pre-driver board. I always have RF
in, but when it fails there is no RF going to the PA.
Even though I have an early TR-7, I have the later version of the
driver board. Unfortunately, I only have the schematic for the early
version in my service manual.
Where can I get a schematic for the later pre-driver board?
Any idea what is happening here? It shouldn't be too much trouble to
figure out which component is going flakey, if I can get a print for
the newer board.
Thanks in advance,
Bob K6GGO
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