Brian Koontz wrote:
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.
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.
Brian -
Congratulations!! It's always nice when one 'comes together'.
Just as an aside, someone suggested earlier (and correctly) that the
"51950" problem may indicate a loss of the 500 kHz reference signal.
You might find it interesting that the left-most three pin connector on
the VCO board is the 500 kHz reference signal!
Those pins on the bottom of the DR-7 are ALWAYS a problem, ya' just
can't see 'em!!
Your 'trials' have been an interesting 'trip' for others, thanks for
documenting it for us all.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
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