Determine hot and ground leads

[Chuck Duchon]

I am repairing a garage door remote that had the battery leads cut.
Unfortunately the wire stubs were remove from the circuit board and I'm not
sure which is hot and which is ground.

There's one circuit that is controlled by a small switch. I'm assuming that
it is the hot. Is it logical that the hot lead would be switched or is there
any other way to determine the correct polarity?

 

[Patch]

"Chuck Duchon" <cduchon@yahoo.com> wrote in message
news:vX2Gb.47583$031.15979@fe3.columbus.rr.com...

I am repairing a garage door remote that had the battery leads cut.
Unfortunately the wire stubs were remove from the circuit board and I'm
not
sure which is hot and which is ground.

There's one circuit that is controlled by a small switch. I'm assuming
that
it is the hot. Is it logical that the hot lead would be switched or is
there
any other way to determine the correct polarity?

The hot lead is probably switched.

 

[Sofie]

Chuck:
Follow the circuitry after the switch....... if it leads to a diode or
electrolyltic capacitor.... you will have valuable clues to the polarity.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"Chuck Duchon" <cduchon@yahoo.com> wrote in message
news:vX2Gb.47583$031.15979@fe3.columbus.rr.com...

I am repairing a garage door remote that had the battery leads cut.
Unfortunately the wire stubs were remove from the circuit board and I'm
not
sure which is hot and which is ground.

There's one circuit that is controlled by a small switch. I'm assuming
that
it is the hot. Is it logical that the hot lead would be switched or is
there
any other way to determine the correct polarity?

 

[mike]

Chuck Duchon wrote:

I am repairing a garage door remote that had the battery leads cut.
Unfortunately the wire stubs were remove from the circuit board and I'm not
sure which is hot and which is ground.

There's one circuit that is controlled by a small switch. I'm assuming that
it is the hot. Is it logical that the hot lead would be switched or is there
any other way to determine the correct polarity?

Take an ohm meter and measure to ground. The - lead is "often" ground.
If the "other" wire goes to the switch, you're likely in business.
Sometimes there's a polarized component like a diode or cap
that can be used as a reference.
mike

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http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Sam Goldwasser]

"Chuck Duchon" <cduchon@yahoo.com> writes:

I am repairing a garage door remote that had the battery leads cut.
Unfortunately the wire stubs were remove from the circuit board and I'm not
sure which is hot and which is ground.

There's one circuit that is controlled by a small switch. I'm
assuming that it is the hot. Is it logical that the hot lead would
be switched or is there any other way to determine the correct
polarity?

You would need to either get the schematic (probably impossible) or trace the
circuit enough to find a component with obvious polarity like an electrolytic
capacitor or transistor.

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