开云体育

In 2010 there was a thread regarding the Drake TR-7 display showing 51950.0 on the old retired Drakelist.

The thread is archived at

Please click the link so the owner knows that we find the archive useful.

Hope this helps.

Tom, AG9X

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Below are the posts from Brian Koontz WA3ITE, Jim Shorney NU0C and Garey Barrell K4OAH (SK)?

(just in case Drake TR-7 DR-7 problems outlive the site)

Re: [Drakelist] Almost there: TR-7 display issues -- FIXED!

Brian Koontz Fri, 30 Jul 2010 20:36:54 -0700

Well, the TR-7 from hell is now a fully operational TR-7 from hell!

In preparation for some signal tracing, I decided to extend the DR-7
board using the extenders I have.? To do this, you have to unmount the
two voltage regulators mounted to the chassis, and jumper the
connector farthest to the right. ?(I didn't bother connecting the
up/down band buttons.) ?Lo and behold, the display worked!

Some further investigation revealed that the chassis has warped over
the years, so the two 3-prong connectors on the VCO board were no
longer in a horizontal line.? So I was determined to make sure the
board was fully seated on all the connectors.

To do this, I had to drop the front panel.? Not a major chore, just
one knob to remove (the band knob) and 6 side screws. With that now
out of the way, it was an easy job to determine if all the pins were
where they belonged.? The only snag was that the front panel, when
canted downwards, angles the PTO can upwards.? So you have to hold the
front panel perpendicular and steady with slight downward pressure to
fully seat the board.? Once all the pins were visually confirmed to be
seated, I remounted the front panel, reattached the regulators and all
the connectors, and fired the rig up.? Everything now seems to work!

It turns out the original DR-7 board was indeed defective as well
(possibly because it had been seated incorrectly).? And a visual
confirmation from topside indicates the chassis is, indeed, warped:
The screw hole is misaligned with the mounting hole in the board.

So, for archival purposes in case anyone else decides to search for
this problem: ?If the display if fixed on "51950", one possible cause
is that one or more DR-7 pins, possibly the VCO pins, are not
correctly seated.? The best solution is to drop the front panel and
confirm visually that the pins are fully seated.

Now it's time to get on the air!

? --Brian/WA3ITE

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Jim Shorney Fri, 30 Jul 2010 23:17:58 -0700