OK to jump transformer with 1 bad pin?

[ligera]

I am repairing a 12 year old Stanley T-120 garage door opener that
stopped working after a lightning storm. I am reading 122VAC on the
primary of the 4-pin
transformer(Tamura;120V;24V-2.0VA;360-2105[model#?]),with
20VAC,19.8VAC, and 0V on the other pins. I think the dead pin should
read 122VAC also, because the circuit path goes directly to the
electrical connector, involving no other components on the board, then
through a black wire to the 120V,5A motor; with the 122V being run
through a transformer just to protect the motor from surges like it
got. I am considering: a)connecting a wire from the primary to the
dead pin, b)unsoldering dead pin and soldering wire from primary to
board, OR c)disconnecting black motor wire from electrical
connector/board and running it straight off the 122VAC where it enters
the unit. Would these be suitable for a permanent solution?
To test to make sure everything else works? What kind of fuse should I
use? If I need a new tranformer, could somebody tell me a model#,
where to get it? I have read the repairfaq on counting turns and
rewinding; but I've never been inside a transformer, so I'm hoding off
on that. Thanks

 

[Bill Renfro]

Lightning is more likely to damage the control board.
The Primary of your transformer will have 120VAC on the lead that is
connected to the hot side of the outlet, and 0VAC on the wire that is
connected to neutral.
If you suspect the transformer, check the continuity of the primary
winding, and the secondary winding. Since you have 20VAC on the secondary
side the transfromer is likely not the problem.
None of your solutions would be a good idea. At best it probably wouldn't
work, at worst you could burn the house down.
At 12 years old you might want to just replace it and call your homeowners
insurance company.

Bill
Christian Technology

"ligera" <lyn19219@yahoo.com> wrote in message
news:7192f824.0312260751.1e6b3fb6@posting.google.com...

I am repairing a 12 year old Stanley T-120 garage door opener that
stopped working after a lightning storm. I am reading 122VAC on the
primary of the 4-pin
transformer(Tamura;120V;24V-2.0VA;360-2105[model#?]),with
20VAC,19.8VAC, and 0V on the other pins. I think the dead pin should
read 122VAC also, because the circuit path goes directly to the
electrical connector, involving no other components on the board, then
through a black wire to the 120V,5A motor; with the 122V being run
through a transformer just to protect the motor from surges like it
got. I am considering: a)connecting a wire from the primary to the
dead pin, b)unsoldering dead pin and soldering wire from primary to
board, OR c)disconnecting black motor wire from electrical
connector/board and running it straight off the 122VAC where it enters
the unit. Would these be suitable for a permanent solution?
To test to make sure everything else works? What kind of fuse should I
use? If I need a new tranformer, could somebody tell me a model#,
where to get it? I have read the repairfaq on counting turns and
rewinding; but I've never been inside a transformer, so I'm hoding off
on that. Thanks

 

[Doordoc]

lyn19219@yahoo.com (ligera) wrote in message news:<7192f824.0312260751.1e6b3fb6@posting.google.com>...

I am repairing a 12 year old Stanley T-120 garage door opener that
stopped working after a lightning storm. I am reading 122VAC on the
primary of the 4-pin
transformer(Tamura;120V;24V-2.0VA;360-2105[model#?]),with
20VAC,19.8VAC, and 0V on the other pins. I think the dead pin should
read 122VAC also, because the circuit path goes directly to the
electrical connector, involving no other components on the board, then
through a black wire to the 120V,5A motor; with the 122V being run
through a transformer just to protect the motor from surges like it
got. I am considering: a)connecting a wire from the primary to the
dead pin, b)unsoldering dead pin and soldering wire from primary to
board, OR c)disconnecting black motor wire from electrical
connector/board and running it straight off the 122VAC where it enters
the unit. Would these be suitable for a permanent solution?
To test to make sure everything else works? What kind of fuse should I
use? If I need a new tranformer, could somebody tell me a model#,
where to get it? I have read the repairfaq on counting turns and
rewinding; but I've never been inside a transformer, so I'm hoding off
on that. Thanks

Not to be rude but if someone does not know the purpose of a
transformer & how to measure the voltage properly then in my opinion
that someone should not be attempting to repair an electronic circuit
board.

As Bill stated you could easily start a fire & what you are suggesting
to do makes no sense whatsoever & should not be attempted since it's
not going to fix the garage door opener problem anyways.

Doordoc
www.DoorsAndOpeners.com