HP 3470A / 3472A Multimeter dead

[Boris Mohar]

Hello,

My favorite piece of nostalgia suddenly stopped working. The +5V and other
supplies are ok. The display is blank except for the decimal point. The
clock is working but the IC it passes the signal to does nothing with it. I
assume that it is a divider of some sort. It has proprietary Motorola number
1820 -0567 I know it is a long shot but maybe one of you know.

--

Boris Mohar

 

[Jim Adney]

On Sat, 15 Jan 2005 07:09:36 -0500 Boris Mohar
<borism_-void-_@sympatico.ca> wrote:

My favorite piece of nostalgia suddenly stopped working. The +5V and other
supplies are ok. The display is blank except for the decimal point. The
clock is working but the IC it passes the signal to does nothing with it. I
assume that it is a divider of some sort. It has proprietary Motorola number
1820 -0567 I know it is a long shot but maybe one of you know.

That's the HP part #, and I show a cross for it to a MC4024P, a "dual
voltage controlled FF," which you may or may not be able to track down
or sub.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------

 

[Boris Mohar]

On Sun, 16 Jan 2005 00:33:40 -0600, Jim Adney <jadney@vwtype3.org> wrote:

On Sat, 15 Jan 2005 07:09:36 -0500 Boris Mohar
borism_-void-_@sympatico.ca> wrote:

My favorite piece of nostalgia suddenly stopped working. The +5V and other
supplies are ok. The display is blank except for the decimal point. The
clock is working but the IC it passes the signal to does nothing with it. I
assume that it is a divider of some sort. It has proprietary Motorola number
1820 -0567 I know it is a long shot but maybe one of you know.

That's the HP part #, and I show a cross for it to a MC4024P, a "dual
voltage controlled FF," which you may or may not be able to track down
or sub.

-

Thanks, it is worse than that. I did some more digging and the culprit is

dead 1820-0798. This is a proprietary six decade counter for which there is
no sub. If anyone has one I would like to hear from them.



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

 

[Jim Adney]

On Sun, 16 Jan 2005 08:37:22 -0500 Boris Mohar
<borism_-void-_@sympatico.ca> wrote:

On Sun, 16 Jan 2005 00:33:40 -0600, Jim Adney <jadney@vwtype3.org> wrote:

On Sat, 15 Jan 2005 07:09:36 -0500 Boris Mohar
borism_-void-_@sympatico.ca> wrote:

My favorite piece of nostalgia suddenly stopped working. The +5V and other
supplies are ok. The display is blank except for the decimal point. The
clock is working but the IC it passes the signal to does nothing with it. I
assume that it is a divider of some sort. It has proprietary Motorola number
1820 -0567 I know it is a long shot but maybe one of you know.

That's the HP part #, and I show a cross for it to a MC4024P, a "dual
voltage controlled FF," which you may or may not be able to track down
or sub.

Thanks, it is worse than that. I did some more digging and the culprit is
dead 1820-0798. This is a proprietary six decade counter for which there is
no sub. If anyone has one I would like to hear from them.

I could use some, too. I show no sub for it either.

Have you googled on that number? Also, try

http://www.sphere.bc.ca/test/

He has some of these proprietary HP ICs.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------