Harrison Labs 6207A DC power supply

[Lenny]

I found this unit at the local landfill and it has an output, however
the panel meter which doubles as a voltage or current indicator
depending upon which front panel switch you push in, does not indicate
anything. Does anyone have a schematic for this power supply or do you
know by chance if anything in particular on the rear terminal strip
needs to be strapped for a on board reading? Thanks very much for any
assistance. Lenny Stein, Barlen Electronics.

 

[Lenny]

I did look for voltage across the meter when the voltage switch was
pushed in and there was none. I also worked the switches but I
suppose they could have bad contacts. I haven't tried cleaning them
though. I just wish I had a schematic to follow the traces. I'm
assuming that the meter when in voltage mode electrically sits across
the output but I can't really tell how the switch switches the meter
to voltage mode. Lenny.
Robert Baer <robertbaer@earthlink.net> wrote in message news:<417372FC.14363FAB@earthlink.net>...

Lenny wrote:

I found this unit at the local landfill and it has an output, however
the panel meter which doubles as a voltage or current indicator
depending upon which front panel switch you push in, does not indicate
anything. Does anyone have a schematic for this power supply or do you
know by chance if anything in particular on the rear terminal strip
needs to be strapped for a on board reading? Thanks very much for any
assistance. Lenny Stein, Barlen Electronics.

I do not know of any commercial PS that requires jumpering to get a
front panel meter to work.
Take the case off and check the wiring and most especially, the switch
(corroded, maybe).
Also it does not hurt to check the meter with a battery and series
resistor (no power = PS unplugged).
Assume 100uAFS and set current to near 50uA; if 1mAFS you will still
see some deflection.

 

[Watson A.Name - \"Watt Su]

"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0410180746.6f51607@posting.google.com...

I did look for voltage across the meter when the voltage switch was
pushed in and there was none. I also worked the switches but I
suppose they could have bad contacts. I haven't tried cleaning them
though. I just wish I had a schematic to follow the traces. I'm
assuming that the meter when in voltage mode electrically sits across
the output but I can't really tell how the switch switches the meter
to voltage mode. Lenny.

I got some HP PS schematics from Ed Matsuda for a very reasonable price.
His email is at earthlink.net, and the part before the at sign is
"ematsuda".

Robert Baer <robertbaer@earthlink.net> wrote in message
news:<417372FC.14363FAB@earthlink.net>...
Lenny wrote:

I found this unit at the local landfill and it has an output,
however
the panel meter which doubles as a voltage or current indicator
depending upon which front panel switch you push in, does not
indicate
anything. Does anyone have a schematic for this power supply or do
you
know by chance if anything in particular on the rear terminal
strip
needs to be strapped for a on board reading? Thanks very much for
any
assistance. Lenny Stein, Barlen Electronics.

I do not know of any commercial PS that requires jumpering to get
a
front panel meter to work.
Take the case off and check the wiring and most especially, the
switch
(corroded, maybe).
Also it does not hurt to check the meter with a battery and series
resistor (no power = PS unplugged).
Assume 100uAFS and set current to near 50uA; if 1mAFS you will
still
see some deflection.