Hi List,
I partially fixed a "lowly" DV411 Dekavider from the
"Electro-Measurements" epoque and wanted to report what worked out and
what still is and have a general question about such devices.
The part in question (just look what the cheapest one on ebay was, one
made a power supply out of it) had a working first and second decade,
but the can with the 3rd switch and last decade potentiometer required
some work.
The switch freewheeled, it didn't lock onto the right on-digit position.
That was due to the slotted wheel slipping on the drive shaft out of
position so it was no longer pressed against the spring-loaded ball. I
was surprised that this wheel was just soldered to the drive shaft, so
it was enough to push it back into the right position and solder it down
with some very agressive flux (Soldeen-1).
http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=locking_cogwheel.jpg
The 4th(5th) decade potentiometer seems to be electrically okay, but it
turns 360° instead of 270°, I consider that it had some delimiters but
these are scraped off. However, careful operation will be possible or
replacement by a potentiometer and a adapter between the thin driveshaft
of the switch to the axle of a new potentiometer. (Hoped to keep it
original.)
http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=potentiometer.jpg
For Pronographic reasons, a overview is available too.
http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=overview.jpg
Besides hints for further repair, does someone know which alloy is used
for wiring by ESI? Seems a bit hard for plain cooper.
Best regards,
Hendrik
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