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Search: Posts Made By: redwire
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 02:29 PM
Replies: 29
Views: 358
Posted By redwire
Re: Powering up a Car Antenna a "different" way

When you connect the battery (nothing on green relay coil wire) , the antenna should (now) move down and then stop, as it goes past the limit switch which disconnects the motor.
Instead, it's not...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-05-2019, 03:06 PM
Replies: 29
Views: 358
Posted By redwire
Re: Powering up a Car Antenna a "different" way

First use a felt pen and put some dots/stripes 1,2,3,4 on the blue wires, so they don't get mixed up.

I think this is right:
Swap the two wires at the motor's terminals. (D2 and B2)
Swap the two...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-04-2019, 02:48 PM
Replies: 29
Views: 358
Posted By redwire
Re: Powering up a Car Antenna a "different" way

With nothing to the relay coil (green), see the diagram- it shows power can flow to the motor until the antenna-down limit-switch upper contact opens and disconnects the motor power.

With the...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-04-2019, 12:53 AM
Replies: 29
Views: 358
Posted By redwire
Re: Powering up a Car Antenna a "different" way

The limit switch is what latches power and keeps the motor running until it reaches an endstop. Not SPDT but it shorts the two ends until an endpoint. No need for diodes then.
Schematic might look...
Forum: Troubleshooting Game Consoles & Other Weird Devices 12-03-2019, 01:35 PM
Replies: 12
Views: 131
Posted By redwire
Re: Help needed identifying a component - AEG Convection Microwave

I see a 12V SMPS with TOP257 IC. Can't see a fuse, is it for this section or the magnetron, the one that is blowing?
That's the SMP transformer, which is custom part for the oven. They don't fail...
Forum: General Capacitor Questions & Issues 12-03-2019, 01:29 PM
Replies: 9
Views: 227
Posted By redwire
Re: What value is this capacitor?

It will not do anything if there is an open light bulb, that charges the cap in series with the 150 ohm resistor I think.
You can't use a timer IC or electronics here because it's a two-prong part....
Forum: Other Devices with Bad Capacitors 12-02-2019, 11:54 PM
Replies: 70
Views: 3,094
Posted By redwire
Re: Whirlpool Refrigerator LED lights flickering

I worry the door switches can handle the inrush currents for a larger SMPS?

It's too bad we don't have one of these boards to sketch a schematic, or know any of the semiconductor part numbers.
Forum: Troubleshooting Power Supplies and Power Supply Design 12-02-2019, 11:36 PM
Replies: 41
Views: 341
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

It's so you can take out the board and put it back in, without screwing up the connectors. Did you notice four are all the same 2-pin connector and can get mixed up!
I use a felt pen and put a...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-01-2019, 12:42 PM
Replies: 238
Views: 8,457
Posted By redwire
Re: Soldering station thoughts and guidelines

It was Hakko's idea, T12 came from the patent, now expired: US 6087631 (https://patents.google.com/patent/US6087631A/enhttps://patents.google.com/patent/US6087631A/en)
It's just a spot weld with a...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-01-2019, 01:47 AM
Replies: 41
Views: 341
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

There's many different ways to troubleshoot something. You can take measurements with power on, you can remove parts and test them.
You can guess the bad parts and change them. Some people start at...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-01-2019, 12:24 AM
Replies: 41
Views: 341
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

There is an electrocution hazard when taking measurements off a live board that is flopping around.
Check if you are OK with your experience level and the dangers of working on mains-powered...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-30-2019, 10:17 PM
Replies: 41
Views: 341
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

For the technical guys, there are hand drawn bits and pieces of the board's schematic on the Web. I did find this "roughly similar" schematic, at least to help understand the basics.

It looks like...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-30-2019, 01:25 PM
Replies: 113
Views: 2,636
Posted By redwire
Re: DPS5020 dual power supply build

It turns out dual-switch contacts are never identical, so one will close last (power-on inrush current) and another will open last (power-off arc). I had a boss yell at me that it would not last any...
Forum: General Capacitor Questions & Issues 11-30-2019, 01:14 PM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

The motor has an open-circuit on the black wire, take it apart.
You might be able to find the break and do surgery to fix it. Or just get a replacement motor. It might be broken from a tug on its...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-30-2019, 01:07 PM
Replies: 2
Views: 86
Posted By redwire
12V 2A battery charger/maintainer

Bought this chinese 12V 2A car/motorcycle battery charger/maintainer $7. It looked OK hardware wise in pics.
But... everything runs quite hot at 2A - IC, transformer, capacitors, output rectifier....
Forum: General Capacitor Questions & Issues 11-30-2019, 06:01 AM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

Redo the ohmmeter test. With three motor wires, there should be continuity between any two wires. No open circuit.
Forum: General Capacitor Questions & Issues 11-29-2019, 08:05 PM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

I read it in a service manual for another Hotpoint Aquarius tumble dryer AQC851. It has an "anti-allergy program" that uses two directions, so the drum must have strange tines. The motor has the same...
Forum: General Capacitor Questions & Issues 11-29-2019, 06:32 PM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

WAIT this motor is reversable? :facepalm:
Forum: General Capacitor Questions & Issues 11-29-2019, 02:18 PM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

You should get continuity, a reading of a few ohms. With the motor unplugged, white-red should be a few ohms and white-black as well. black-red should roughly equal the sum of the two.

If you get...
Forum: General Capacitor Questions & Issues 11-29-2019, 12:51 PM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

Hotpoint TVF770G Aquarius tumble dryer 95687010000, also goes by Indesit, Ariston, Cannon, Creda, Proline etc. I could not find the service manual.
But looking at another model, the motor has two...
Forum: General Capacitor Questions & Issues 11-29-2019, 02:10 AM
Replies: 34
Views: 441
Posted By redwire
Re: Tumble Dryer start capacitor

What make and model is the dryer?
You likely have a run capacitor and a start switch. But that's more than three wires...
Forum: General Electronics Technical Discussion 11-28-2019, 09:56 PM
Replies: 4
Views: 172
Posted By redwire
Re: Capacitor brand ?

I'm bursting with laughter :tongue: Bulging with knowledge
Venting my excitement LOL
Forum: Troubleshooting Power Supplies and Power Supply Design 11-28-2019, 09:53 PM
Replies: 34
Views: 253
Posted By redwire
Re: need some help with resistor values

I found typical part values for CR6855 (http://www.jypower.cn/down/201413133146685.pdf) in a 12V 3A power supply and 5N60 MOSFET, and laptop 19V 2.1A application.

R9 Current-sense I see a "5" and...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-18-2019, 06:04 AM
Replies: 238
Views: 8,457
Posted By redwire
Re: Soldering station thoughts and guidelines

The stray voltage will be enough to damage semiconductors! :eek: I killed a few IC's before realizing I had a bad ground on my workbench mat, so I added LED indicators:...
Forum: General Electronics Technical Discussion 11-17-2019, 02:18 PM
Replies: 15
Views: 422
Posted By redwire
Re: Plasma Height Voltage Divider board

I keep thinking the site has a power problem, if it blows power supplies and fuses on equipment. This is when I look for an open neutral or bad ground at the distribution transformer. Call the...
Showing results 1 to 25 of 500

 
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