Does this Bridge Rectifier bottom look bad?

[Bishop]

Does this Bridge Rectifier bottom look bad? It's from a Elite Miracle-One gate opener.

I pull this board from my gate opener this morning after it blew a 3 amp fuse yesterday. The gates refuse to open when I hit the remote.

I checked the board and saw a fuse bad, I replaced the fuse and when I hit the remote button and the fuse blew again. I pulled the board and everything is normal on the top side but on the bottom I found two places the the solder looks rusty.

The first photo group is below the bridge rectifier, the second photos is from the under side near the left side of the board.

Does the rust color say something?

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

I forgot to say, the bridge rectifier is just below the fuse that keeps blowing. there is another 1.5 amp fuse next to the bad fuse but it doesn't blow, only the 3 amp blows when I try to open the gates.

[stj]

Re: Does this Bridge Rectifier bottom look bad?

you need to check it with a meter,
the brown is flux from a previous re-soldering.

[budm]

Re: Does this Bridge Rectifier bottom look bad?

Good clear straight shot pictures of the whole top and bottom side of the board will help troubleshooting.
You do have meter for testing, right?

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

I also forgot to say, When I found the second fuse had blown I found the 24Vac was bad and was outputting only 1.5 Vac. I don't know what happened to it because we have not had any bad weather lately. I did connect the second new fuse without the AC transformer plugged in, but it blew anyway.
A new 24Vac-40va has been ordered and will arrive in 5 days.

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

I have a Fluke digital meter and a small ESR meter

[budm]

Re: Does this Bridge Rectifier bottom look bad?

You have 3 fuses on that board , which one that blow, the 15A or the two 3A fuse?
https://www.badcaps.net/forum/attach...8&d=1493256609
I cannot clearly see how the two 3A are connected in that section due to poor contrast of the picture.
BTW, you can do resistance test between the two outer pins of the bridge, and also between the two inner pins of the bridge see how Ohms it shows.

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

There is a 15A on the left but the two together on the right are smaller.

The bottom right section have two, one is a 3A the other is a 1.5A fuse

The 3A keeps blowing, third time I ran out of 3A fuses.

I just read an older post from another forum and the guys problem was the same as mine. He replaced the surge protection board. An add-on Elite board and that sloved it for him, so I leaning toward that now. If that is the problem I'll know when I remove the surge protection and wire it back to original way.
It will be a few days because it's raining for a few days now.

I'll post the results, but I still hope someone that's has an idea please post it here.

[vinceroger69]

Re: Does this Bridge Rectifier bottom look bad?

maybe do the test as budm suggests in post 7 just too rule out the bridge rectifier.

[stj]

Re: Does this Bridge Rectifier bottom look bad?

could even be a stalled or flooded motor.

[budm]

Re: Does this Bridge Rectifier bottom look bad?

Is this what you have?

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

Yes, I have the dual gate or the Q223 circuit board

[redwire]

Re: Does this Bridge Rectifier bottom look bad?

It's the control board fuse blowing only when the motor gets activated?

The left 15A fuse is for the motor.
The middle 3A fuse is for the control board
The right 1.5A fuse is for the battery charging.

To me, means the short is in the controls for the motor or brake.
The power semi's below the relays, looks like two sets of Schottky diode/mosfet mtp50n06v on plastic rivets. Check/compare readings on them.
I looked again and the one far left mosfet looks like it was replaced, this board may been RMA'd already.


Seems strange to have 6 power relays and dual boost converter? or SSR... must be the brake is mechanically normally on?
I would check the 4 power semi's and the surge suppressor board diodes are easy to check out with a multimeter on diode-test, it's a bunch of gas tubes and a couple TVS diodes.

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

As I was looking through the Miracle one original papers I found the Elite Surge suppression installation manual.

The original Miracle system did not come with the surge protection board. When I had to replace the 1st Miracle board that died, the second board came with the surge board. It's been working great for several years until last week.

While I was reading the original surge protection information today, I realized that there is a surge suppression reset switch. It's a small two wire push button type switch.

I have a new 24V transformer ordered (that I found was dead), which may come in Monday. After I get a new power source installed, I'll push the surge reset switch.

I tried to find some online information about the switch, but all I found was places to buy another one.

My question now is, does any here any knowledge of what the surge suppression switch controls?

Could it be that the switch is stopping the gate to operate properly?

I will not know until the new transformer gets here.

Has anyone had to used the surge switch before?

Thanks

[budm]

Re: Does this Bridge Rectifier bottom look bad?

I just look at the owner manual, that Wallwart Transformer is 34VAC so more likely that the 34VAC is fed to that bridge rectifier and that 3A fuse is part that power supply circuit. If I were you I would check the bridge and other rectifiers as well as I suggested otherwise you may be ending up blow up your new power transformer.

[redwire]

Re: Does this Bridge Rectifier bottom look bad?

Bishop, can you post pics of both sides of the Elite Miracle-One surge suppressor board and the reset switch. It looks like an electronic circuit breaker but not sure. Doubt it's this causing the problem.

To fix this gate opener, it is best to troubleshoot and find the short-circuit.

I agree with budm, the new power transformer will fail because the short-circuit is still there, possibly the reason the old transformer died.

It could be the surge suppressor board, control board, or overload from attached devices such as the radio receiver, burglar alarm outputs, photoelectric eye, siren etc.

Spend 5 minutes with a multimeter on ohms or diode test and check things. We can help.

[Bishop]

Re: Does this Bridge Rectifier bottom look bad?

Redwire,

How did you find so much information about the miracle-one board? Do you have a circuit layout for the board?

I have three Miracle-one bad boards that I've kept since 2000. Each one has a different problem, but I couldn't wait about the gate system since it's used so often
I have look all over the internet and asked several corp locations for information on ID the circuit board. And no help at all. Several things on a board I can change but several item I can't change because I don't have the right equipment to do so.

ID-ing is my biggest problem, no let me correct myself, vision is my biggest problem since I'm going on 70 next year. But I got the bug 10 years ago when I repaired my first flat panel monitor. It was just a few Caps but I was hooked.
Since then I have amazed myself on my success with monitors and computers and cable boxes. I know I've had help from above.
I replaced three caps on a friends TV a few years back. One cap came from Europe, one from China and one from Japan.
It took almost three months to get the caps, but I bought the best caps brand I could find.

Do you have access to the Miracle one circuit layout ID-ing the items? I would like to have it because the Miracle board has been the hardest board for me to repair.

[stj]

Re: Does this Bridge Rectifier bottom look bad?

foto's?

[budm]

Re: Does this Bridge Rectifier bottom look bad?

So when are you are going to start looking for shorted circuit that caused the 3A fuse to keep blowing and also took out the power transformer?
Page 37, 38 for the surge suppressor board if that is what you have.

[Longbow]

Re: Does this Bridge Rectifier bottom look bad?

Well, I'm sure you can find a shorted part if you think about it. Testing the bridge is easy and can be done in-circuit. However, my guess is that the unit is mounted at an outside gate, with AC wiring traveling some unknown distance to get the opener. Think about electrical charges being induced in the power wiring, especially if it is a long run. Think about electronics outdoors in a varying moisture environment, varying hot/cold temps. Add to that the liklihood that the opener gets mechanically slammed each time it works and each time the gate shuts. Winning combination, right? Great news. This can be fixed with a multimeter.