reversed polarity to Dittel issue

[Sam Zimmerman]

I inadvertently powered up with battery reversed polarity. Seems all
instruments except Dittel FSG 2T survived. Anyone have experience with this?
US repair station?? SZ

[nic]

On Apr 15, 7:45*am, "Sam Zimmerman" > wrote:
> I inadvertently powered up with battery reversed polarity. Seems all
> instruments except Dittel FSG 2T survived. Anyone have experience with this?
> US repair station?? *SZ

I did the same thing on the LS-4 I sold to you years ago. There was a
fuse in the Dittel radio that saved it. The repairman changed the fuse
and all was ok.

Ed Gaddy

[Erik Braun]

> The repairman changed the fuse and all was ok.

Some radios have a thermal fuse on the side. It just has to be pushed
and the radio works again. At least some Becker types have this.

Regards, Erik.

[ContestID67[_2_]]

The MicroAire radios have an internal "pico" fuse that protects the
unit from reversed power. Ask me how I know ;-) Maybe the Becker has
the same thing.

A pico fuse is about the side of a 1/8w resistor (grain of rice) and
is soldered inside the unit. It is not considered user repairable/
replaceable. While I have been able to replace the fuse, it isn't a
task for the uninitiated without a good small wattage, small grounded
tip, soldering iron. Too much heat and you can lift a trace or scorch
the board. Too big of a soldering iron tip and you might unsolder
more than you intend. A bit of a static spark and the device goes
poof. Sorry to scare anyone but you don't want to toast a very nice
radio.

[Dave Nadler]

On Apr 15, 5:14*pm, ContestID67 > wrote:
> The MicroAire radios have an internal "pico" fuse that protects the
> unit from reversed power. *Ask me how I know ;-) *Maybe the Becker has
> the same thing.
>
> A pico fuse is about the side of a 1/8w resistor (grain of rice) and
> is soldered inside the unit. *It is not considered user repairable/
> replaceable. *While I have been able to replace the fuse, it isn't a
> task for the uninitiated without a good small wattage, small grounded
> tip, soldering iron. *Too much heat and you can lift a trace or scorch
> the board. *Too big of a soldering iron tip and you might unsolder
> more than you intend. *A bit of a static spark and the device goes
> poof. *Sorry to scare anyone but you don't want to toast a very nice
> radio.

One time I saw a 1943 Buzzard-Master - someone hooked up
the battery backwards and there was a giant flash from
under the panel ! Maybe look under the panel for one of them
old-style screw fuses and put a penny in there ?

[Dave Nadler]

On Apr 15, 7:45*am, "Sam Zimmerman" > wrote:
> I inadvertently powered up with battery reversed polarity. Seems all
> instruments except Dittel FSG 2T survived. Anyone have experience with this?
> US repair station?? *SZ

Dittel manual says it has an auto-reset fuse.
See: http://www.wingsandwheels.com/FSG2T%20Installation%20Operation%20manual.pdf
Appendix A3

How long did you wait before you tried it again ?
Its a thermal device which has to cool after being abused.

On the bright side, it will be nice and quiet in the cockpit...

Have fun in Perry,
Best Regards, Dave