Help on IM-5228 VTVM

[Harvey A. Kader]

Bob wrote:
>
> This unit has decided that the meter shall always be pinned in one
> direction or the other depending on the setting of the function switch
> and independent of any attempt to zero set. The 12AU7 is good. Any
> ideas? I have no schematic, but tons of test equipment.
>
> Bob
>
> Sponsored by the City of Tempe
>
> Listserver Submissions:  heath at listserv.tempe.gov
> Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
> Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"

Hi Bob.

I have a IM-5228 which I built in the very early 80's. The condition
which you describe sounds like a short in the circuitry. I would check
the entire zero control circuit.

Harvey A. Kader - http://www.angelfire.com/on/vacuumtubes

Sponsored by the City of Tempe 

Listserver Submissions:  heath at listserv.tempe.gov
Listserver Subscription: listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"