Ah yes, a Molex issue. I knew I had seen that somewhere before but did not think to check Drakelist. Another thing to do is inspect the female connectors looking into the pin holes. If you see a large gap between the springy bit (another technical term) and the inside wall of the connector that pin may not be making good connection. The connector will need to be re-tensioned or replaced. The female connectors are vulnerable to this with the usual way the DR7 is removed and re-installed. A better way is to angle the front panel forward using the method described in the service manual as part of the procedure to access the PTO. Then it is a straight up and down for the DR7.
Another point of concern is the male pins that have circuit connections on the bottom side of the DR7 board. If the vias are not well flowed through with solder to the bottom side this becomes a stress point for the same reason stated above and may go intermittent or open circuit. And as I have stated before a few times, on boards this old I never trust a via! The bottom connections are not hard to get to, you can gently pry the plastic pin retainer up away from the circuit board far enough not to melt it but not so far as to fall off.
If you have to take the VCO or Translator boards out there is another connector check you can make. Components on the boards are packed pretty tightly and it is possible for a component to be bent too close to the back of a female connector and potentially short to the end of the male pin poking through. I don't think I have seen this as a latent defect but it can happen when someone is working on a board. The left rear corner f the DR7 is prone to being pushed down just a little too far and shorting to something. Fortunately it doesn't let out any smoke. I like to put a couple of small flat sticky rubber feet in that spot as bumpers to restrict how far the pins can be pushed in.
On Fri, 27 Dec 2024 18:05:10 -0600
"Tom Evans via groups.io" <Tom.AG9X@...> wrote:
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
--
73
-Jim
NU0C
Jim Shorney