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Search: Posts Made By: redwire
Forum: Troubleshooting Game Consoles & Other Weird Devices Today, 12:51 PM
Replies: 8
Views: 208
Posted By redwire
Re: Drying Oven - Preset Temp Fail

Mechanical failure - temp sensor beatup up, broke, got water in it, broken wires, corrosion I would also rule out. It might be a thermistor but the resistance could be compared between ovens.

The...
Forum: General Electronics Technical Discussion Today, 12:39 PM
Replies: 6
Views: 160
Posted By redwire
Re: DVM circuits

The PC board is "MX-480D-B" but no hits.
I don't see the usual two-transistor clamp or a PTC thermistor. Low cost DMM's sometimes have missing protection circuits and they easily die.
I would...
Forum: Troubleshooting Game Consoles & Other Weird Devices Yesterday, 09:44 AM
Replies: 8
Views: 208
Posted By redwire
Re: Drying Oven - Preset Temp Fail

Check if the triac on the big heatsink is shorted between MT1 and MT2. Those are the fat wires on it. That would leave heat on all the time until the safety cutouts trip.
Triac is TAG semiconductor...
Forum: General Electronics Technical Discussion 01-20-2021, 01:37 PM
Replies: 6
Views: 160
Posted By redwire
Re: DVM circuits

There's lots of DVM schematics out there, if you have a make/model or pictures of the board it can help figure out the DVM chip used and what parts might be damaged.

Usually a low cost DVM...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 01-20-2021, 01:30 PM
Replies: 40
Views: 6,984
Posted By redwire
Re: KSGER STM32 T12 soldering stations

Check the handle and its wiring. The shake switch can be installed upside down or wired wrong and it picks up noise.

Here is the schematic for your KSGER 24V power supply at post #3....
Forum: Troubleshooting Audio Equipment 01-19-2021, 12:35 AM
Replies: 12
Views: 272
Posted By redwire
Re: Distorted audio and HOT transistor - Denon DCD-610 CD PLAYER

It's likely those are spindle motor drive the transistors are for.
The CXA1182 (http://www.ids-elektronik.de/242.pdf) IC drives many transistors in a bridge. The pairs drive the spindle servo, sled...
Forum: General Electronics Technical Discussion 01-16-2021, 02:59 PM
Replies: 11
Views: 514
Posted By redwire
Re: component help marked "5JRA"

I also find oddball chinese (fab) SMT marking codes searching at Ali, as a last resort.
Forum: Troubleshooting Audio Equipment 01-15-2021, 09:36 PM
Replies: 20
Views: 659
Posted By redwire
Re: A 9010 o n k y o amp , schematics & help please

What does the receiver (MCU) do with the IR remote control volume up/down?
I guess it just commands the potentiometer motor to move up/down.

With the volume board disconnected, I just see the MCU...
Forum: Troubleshooting Audio Equipment 01-15-2021, 02:55 PM
Replies: 20
Views: 659
Posted By redwire
Re: A 9010 o n k y o amp , schematics & help please

The volume control seems to be an analog control voltage 0-3.3V from the motorized potentiometer, then fed to the MCU A/D converter VOLUME_IN. Then the MCU sends digital volume SPI to IC04, IC05.
Forum: General Electronics Technical Discussion 01-15-2021, 02:36 PM
Replies: 18
Views: 4,188
Posted By redwire
Re: Repairing Remotes

OK so that repair did not last long. The problem is no glue really sticks to polyethylene and the pads fell off.

Next, I tried a USD $7 rubber pad kit from fleaBay "keypad repair KIT for IR remote...
Forum: Troubleshooting TVs and Video Sources 01-15-2021, 02:30 PM
Replies: 6
Views: 222
Posted By redwire
Re: Can you revive TV remote controls?

This has been discussed before: https://www.badcaps.net/forum/showthread.php?t=26547
I have the best success using conductive rubber pad kits, I'll update that thread...
Forum: Troubleshooting Computer Displays 01-14-2021, 09:14 PM
Replies: 3
Views: 280
Posted By redwire
Re: Samsung SyncMaster740N ?

Check the replacement capacitors are still OK, they might have died after 5 years, if they were not top brands.

In a dark room, you can see backlight bleed-through and the tubes run across the top...
Forum: General Electronics Technical Discussion 01-13-2021, 11:07 PM
Replies: 9
Views: 263
Posted By redwire
Re: Load Testing Audio PA Amplifiers

My reply seems to have vanished :why:


Yes loudspeakers are inductive, a large woofer has several mH.
But a crossover network has the Boucherot cell...
Forum: Troubleshooting Audio Equipment 01-13-2021, 08:47 PM
Replies: 5
Views: 214
Posted By redwire
Re: onkyo 919 Receiver... hum problem but...

The ribbon cable connectors have a release latch. If you don't undo the latch- you will trash the connector. I thought it's a bar that you poke with a small screwdriver that pushes back the spring on...
Forum: Troubleshooting Audio Equipment 01-13-2021, 08:44 PM
Replies: 24
Views: 518
Posted By redwire
Re: Old Pioneer Amp - Waveform explanation

The transistor pair's beta need to be well matched if you're replacing the 2SC2259's and expecting low offset voltage.
At this age, I would replace the few electrolytic capacitors in the power amp....
Forum: Troubleshooting Computer Displays 01-13-2021, 08:40 PM
Replies: 3
Views: 280
Posted By redwire
Re: Samsung SyncMaster740N ?

It sounds like the CCFL backlight IC is shutting down. They turn on the backlight, if it detects abnormal current, such as open tube, arc, bad connection they shutdown after a few seconds.
See if...
Forum: General Electronics Technical Discussion 01-13-2021, 01:36 PM
Replies: 11
Views: 466
Posted By redwire
Re: 4017 counter reset problem

In your first circuit, I would make some changes, such as adding a driver transistor for the relay because a 4017 has weak output drive a few mA. It would be a circuit that either counts to one or...
Forum: Troubleshooting Audio Equipment 01-12-2021, 02:07 PM
Replies: 24
Views: 518
Posted By redwire
Re: Old Pioneer Amp - Waveform explanation

The STV2H diodes I mentioned in post #4 are well known to fail with age and cause bias problems in vintage Japanese amplifiers.
Forum: General Electronics Technical Discussion 01-12-2021, 02:01 PM
Replies: 9
Views: 263
Posted By redwire
Re: Load Testing Audio PA Amplifiers

You can use mains heaters - ovens, stove elements as low cost load resistors. You must have a fan of course. 500W or 1000W convection cooled is no good.

You can blow amplifiers doing full power...
Forum: Troubleshooting Audio Equipment 01-08-2021, 02:02 PM
Replies: 24
Views: 518
Posted By redwire
Re: Old Pioneer Amp - Waveform explanation

Maybe post a pic of the pc board, the newer version A-5 seems to have parts numbered transistors Q400-up, caps C400-up and the old JFET version was like C16, C17 with a few extra op-amps for servos.
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-08-2021, 01:57 PM
Replies: 50
Views: 4,537
Posted By redwire
Re: LG Washer/Dryer Power Fail

OK good :) just for anyone else who needs to fix an LG combo washer dryer model 1480YDS.
You were really thorough with the repair and have some good data.
So expensive to just toss them out and...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-07-2021, 08:45 PM
Replies: 50
Views: 4,537
Posted By redwire
Re: LG Washer/Dryer Power Fail

Thanks for the update.
The diode D243 is for 22V fan motor it seems. An ES3 (https://www.vishay.com/docs/88589/es3.pdf) is a normal diode 0.9Vf and will run ~20% hotter than Schottky SS36...
Forum: Troubleshooting Audio Equipment 01-07-2021, 08:29 PM
Replies: 24
Views: 518
Posted By redwire
Re: Old Pioneer Amp - Waveform explanation

There's three different Pioneer A-5 service manuals: (https://www.hifiengine.com/manual_library/pioneer/a-5.shtml)
HE, HB - Europe, UK models ART-618 but I found ART-621.
YP, S, KC - Australia,...
Forum: General Capacitor Questions & Issues 01-02-2021, 01:43 PM
Replies: 13
Views: 1,334
Posted By redwire
Re: How high does plunger come up if bad? Cornell Dubilier 23000UF

The "plunger" is not really an indicator of end-of-life, it's just the vent valve and yours look perfectly normal - sticking out above the top cover.
I've had some Mallory parts shrink (in) and...
Forum: Troubleshooting Game Consoles & Other Weird Devices 12-24-2020, 12:13 AM
Replies: 13
Views: 643
Posted By redwire
Re: Matsui 175S microwave fuse replacement

The schematic does show the red wire connections, the white is the filament winding. So the transformer and HV fuse do connect to the cap right terminal like you've got it.

Are you going to test...
Showing results 1 to 25 of 500

 
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