Capacitor ID help requested

[lynp]

I am repairing a Stanley garage door opener that stopped working after
a lightning storm. There are 3 identical greencaps in the
120vAC-transformer-resistor-12vDC relay portion that have no
continuity in circuit. The first line on the cap says: .004 7K ; the
second line: 400NEM. I'm assuming that means .0047uF, 10%; but 400v
doesn't sound right(there IS a space between the 4 and 7 on the top
line). If anyone could tell me the voltage rating,I would be grateful.

 

[Jerry Greenberg]

These rarely go bad. Capacitors will not measure continuity with an
ohm meter. They are reactive devices. You need an ESR meter, and a
capacitor meter to test these. These are for relay noise supression
only. If they were bad, there would be some electrical interferance
noise on radios and TV sets when the door is opening and closing.

First check if the power supply is putting out to the main
electronics, and work from there. If the supply is not working,
replace the supply circuit board. If you have the skills and a way to
analyse the supply you can try to service it yourself.

These devices are normaly not serviced at the component level. If you
contact Stanly, they can supply you replacement boards (modules), or
they may send you directly to their rep. After replacement, you will
have to do some adjustments, and the code settings.

If the main part of the board is not working, the RF section, and
coding sections are fairly complex. You will not be able to service
this with a simple ohm meter yourself, if you wanted to try. There is
the chance you may be lucky and find the bad components, but this is
more of a gamble when working blindly.

It may even be more economical for you to call the Stanly people to
have a service call, and have your system serviced properly. There are
mains voltages used to drive the motor, relays, and some of the
control outputs. This can be lethal to mess with, and must comply to
strict electrical standards for safety.


Jerry Greenberg
http://www.zoom-one.com

--


lyn19219@my-deja.com (lynp) wrote in message news:<f797d81d.0312201045.2974ed5@posting.google.com>...

I am repairing a Stanley garage door opener that stopped working after
a lightning storm. There are 3 identical greencaps in the
120vAC-transformer-resistor-12vDC relay portion that have no
continuity in circuit. The first line on the cap says: .004 7K ; the
second line: 400NEM. I'm assuming that means .0047uF, 10%; but 400v
doesn't sound right(there IS a space between the 4 and 7 on the top
line). If anyone could tell me the voltage rating,I would be grateful.

 

[Doordoc]

jerryg50@hotmail.com (Jerry Greenberg) wrote in message news:<460a833b.0312201424.663038e4@posting.google.com>...

These rarely go bad. Capacitors will not measure continuity with an
ohm meter. They are reactive devices. You need an ESR meter, and a
capacitor meter to test these. These are for relay noise supression
only. If they were bad, there would be some electrical interferance
noise on radios and TV sets when the door is opening and closing.

First check if the power supply is putting out to the main
electronics, and work from there. If the supply is not working,
replace the supply circuit board. If you have the skills and a way to
analyse the supply you can try to service it yourself.

These devices are normaly not serviced at the component level. If you
contact Stanly, they can supply you replacement boards (modules), or
they may send you directly to their rep. After replacement, you will
have to do some adjustments, and the code settings.

If the main part of the board is not working, the RF section, and
coding sections are fairly complex. You will not be able to service
this with a simple ohm meter yourself, if you wanted to try. There is
the chance you may be lucky and find the bad components, but this is
more of a gamble when working blindly.

It may even be more economical for you to call the Stanly people to
have a service call, and have your system serviced properly. There are
mains voltages used to drive the motor, relays, and some of the
control outputs. This can be lethal to mess with, and must comply to
strict electrical standards for safety.


Jerry Greenberg
http://www.zoom-one.com

--

Stanley garage door openers are no longer in existence so there is no
"Stanley" people to call. The openers have not been made for a few
years now & most of the parts are very difficult, if not impossible,
to find.

Doordoc
www.DoorsAndOpeners.com