Author Topic: Electrical battery charging question (Read 7048 times)

MötleyRöx · « **Reply #50 on:** January 11, 2010, 08:43:36 AM »

Quote from: 1080 on January 10, 2010, 09:17:13 PM

Need you to remeasure the DC voltage at the yellow & black points of the photo.

9.7 volts dc

MötleyRöx · « **Reply #51 on:** January 11, 2010, 11:00:45 AM »

Astroflight emailed me back very quickly.
They said they could try to fix it, but doubted their success due to its age.
But, if I send my charger to them and a check for 45 bucks, they would send a 115D (just a few years newer, still late 90s model) if they were unable to get mine working.
Not sure how much I want to spend $45 on an old used charger, but at least its an offer and a quick response.

MötleyRöx · « **Reply #52 on:** January 11, 2010, 11:35:30 AM »

Weird thing happened this morning.
I plug the charger in and it starts to make an electrical noise, not sure what it is, but it sounds kind of like its trying to do something.
So, I grab the meter and test output.
I get no reading for amperage, and 2.7 volts DC.
Its not the right voltage, but its a reading!

1080 · « **Reply #53 on:** January 11, 2010, 11:37:17 AM »

That maybe good about Astroflight, but I think the problem is that three legged device circled in blue?
And if it is that part the cost ( if you can solder the part in yourself ), will cost much less.

You did not provide the numbers off of the three legged device, is there any? We're in trouble if not.

If you can measure a few more DC voltages. I think that device maybe a SCR?
Measure DC voltages at Purple
Yellow
Blue
You blocked my post, That is wierd

Meter negative probe on battery negative lead.

MötleyRöx · « **Reply #54 on:** January 11, 2010, 11:46:38 AM »

IRF9234
I*R9033
3N 3Z

Was just getting to that 1080.

That's what it says on there. The * is actually a diode symbol... just not on my keyboard.

1080 · « **Reply #55 on:** January 11, 2010, 11:53:22 AM »

That looks like a FET transistor number. Thanks I will look that up.

MötleyRöx · « **Reply #56 on:** January 11, 2010, 11:56:09 AM »

4.1 vdc at the red dot
9 vdc at yellow
9-10 vdc at green

MötleyRöx · « **Reply #57 on:** January 11, 2010, 12:10:09 PM »

By the way, something screwy with those solder points or something else, but it was hard to get those readings.
I kept getting only about .1 dcv, give or take, then they went up, then down, then they shot up to the actual readings I gave and sort of stabled out.

TwoTired · « **Reply #58 on:** January 11, 2010, 12:14:33 PM »

IRF9234 is a power MOSFET.
I found them for a $1 during an online search. A specific Data sheet I couldn't find, as it looks like International Rectifier improved the process and replaced it with a beter functioning part. See:
http://www.irf.com/whats-new/archive/nr960105.html

I did find data sheets for the older IRF923x series of parts.

1080 · « **Reply #59 on:** January 11, 2010, 12:34:23 PM »

I am also having problems locating info

Maybe you can contact Astroflight Inc. and if they will send you the part or if you can buy it off them.

Will continue search.

MötleyRöx · « **Reply #60 on:** January 11, 2010, 12:37:25 PM »

So, those readings tell you that is the problematic part?

1080 · « **Reply #61 on:** January 11, 2010, 01:44:05 PM »

Yes, because when the device goes bad it can two ways. Short which your DC voltage would read higher than 12volts & lots of current or the device would go high resistive which the voltage would be lower than 12volt and there would be low current output.

You could disconnect the positive leads from the bridge rectifier and verify that the DC voltage goes back up. Unsolder these ( do not know if you have a soldering iron /gun ) and measure that ternimal with the negative lead on black location of photo.

Hopefully we can come up with specs on the Mosfet.

MötleyRöx · « **Reply #62 on:** January 11, 2010, 01:48:16 PM »

So, disconnect the white wires (+) where you have the red arrow?
Then measure w/ negative on the black and positive where?

Sorry, but as you're probably aware, we've reached the realm where I'd be FUBAR'd w/out you guys.

MötleyRöx · « **Reply #63 on:** January 11, 2010, 01:51:28 PM »

Quote from: 1080 on January 11, 2010, 01:44:05 PM

( do not know if you have a soldering iron /gun )

I do... it is the skill that I lack.

TwoTired · « **Reply #64 on:** January 11, 2010, 02:14:50 PM »

Lots of soldering videos on Youtube.

Skill is gained with practice.

1080 · « **Reply #65 on:** January 11, 2010, 03:47:46 PM »

Yes, unsoldered those two white wires. The voltage should be above 12 DC volts if the recitifer is okay. You should get yourself a small roll of Solder-wick ( a copper braided wire at sucks up the solder ), or could heat the terminal and gently pulled the wires off.

1080 · « **Reply #66 on:** January 12, 2010, 10:03:14 PM »

Just got a reply from International Rectifier & they ask me to check the part number on the device. They have no info on IRF9234, but have info on IRF9Z34. Can you re-check with a magnifying glass to see if the Two is a Zee (Zed in Canada)

. Maybe you could take a close up photo.

MötleyRöx · « **Reply #67 on:** January 13, 2010, 08:36:26 AM »

Zed's dead, baby.
And I found his tiny little tombstone! He is now haunting my little charger.

Yep, itsa Z

No, I don't think I could get a picture of that... the writing is so faint.
But I can tell you that I did misread the Z.

1080 · « **Reply #68 on:** January 13, 2010, 10:19:43 AM »

Good I will tell them.

I still would like that voltage ( those two white wires re-moved from the positive terminal of the bridge rectifier ) reading.

1080 · « **Reply #69 on:** January 13, 2010, 10:40:37 PM »

Price for a IRF9Z34NPBF form International Rectifier is $1.18 each, shipping extra.

MötleyRöx · « **Reply #70 on:** January 14, 2010, 10:51:58 AM »

10.2 volts DC

1080 · « **Reply #71 on:** January 14, 2010, 12:50:24 PM »

Sounds low $:-\$ , but does the owners manual say that it also charges the car battery?

I think you need to measure the bridge rectifier to be sure.

Measure forward & reverse directions with your meter ( in resistance mode 2Kohms range ) and record each reading. If you start with your black lead on rectifiers postive and your red lead to the AC terminal ( shown in the photo). Then you repeat it for each diode in the photo.

What you should have is a meter reading one way and not the other way when the meter leads are reversed.

Are you still following?

You should see about ordering the Mosfet.

MötleyRöx · « **Reply #72 on:** January 14, 2010, 01:05:13 PM »

Quote from: 1080 on January 14, 2010, 12:50:24 PM

Sounds low $:-\$ , but does the owners manual say that it also charges the car battery?

Which car battery? the RC or the auto? Auto battery powers the charger, thus charging the RC battery.

I'll get back to you with measurements.
Just got the first set of pix from the wife for our new house, so I'm editing those too at the moment.

1080 · « **Reply #73 on:** January 14, 2010, 02:01:15 PM »

Explain Auto battery. What is type of battery is connected to photo circled in red & labeled # two?
What is it's voltage of the auto battery and is it also supposed to be charged by the charger? What does the owners manual say about the Auto battery?
The Rc battery is connected to red circle 1 which is a 7.2 battery correct?

Sorry for my confusion.

MötleyRöx · « **Reply #74 on:** January 14, 2010, 02:39:35 PM »

Yes, #1 is for the RC battery 7.2volt 6 cell
#2 is for using an automotive battery (in your car, trackside) to power the charger for charging the 7.2 volt RC battery.

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Author Topic: Electrical battery charging question (Read 7048 times)

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