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Search: Posts Made By: redwire
Forum: Troubleshooting Audio Equipment Today, 12:35 AM
Replies: 1
Views: 175
Posted By redwire
Re: ONKYO TX-SR607 ; FL Tube LCD Replacement ?

It is common to have bad solder joints at the tube because the pins are made of Kovar and do not solder easily. Or the power transformer pins have bad solder connections, or at the middle board.
...
Forum: General Electronics Technical Discussion Today, 12:08 AM
Replies: 14
Views: 227
Posted By redwire
Re: Help substituting avalanche diode

I would use P5KE120A (https://www.mccsemi.com/pdf/Products/P5KE5.0-P5KE200A(DO-15).pdf) TVS diode as a replacement.
Forum: General Electronics Technical Discussion 02-24-2021, 03:17 PM
Replies: 4
Views: 172
Posted By redwire
Re: RAB Lighting 30 and 48 White LED 9-12VDC Blinding Light Barsó> Very nice light ba

Thanks for the heads up.
I saw it was $7.95 and just went up? One 4-pack RAB Lighting 30 G24723A strips for $9.95 (Limit 1 Per Order). You can only order one pack.

It's been a long time since I...
Forum: General Electronics Technical Discussion 02-22-2021, 01:57 AM
Replies: 11
Views: 223
Posted By redwire
Re: Whats this ripple?

The ringing I don't think is much of a problem.
It's the low 3.3V drive to the mosfet. IRF510N (https://www.vishay.com/docs/91015/sihf510.pdf) would really like at least 5V gate-drive to turn on to...
Forum: General Electronics Technical Discussion 02-22-2021, 12:32 AM
Replies: 7
Views: 292
Posted By redwire
Re: Testing for short circuit in diode mode

Older digital multimeters had "low power ohms" that apply under 0.4V which keeps diodes and most semiconductors off, allowing you to make ohms measurements in-circuit.

You would use both with...
Forum: General Electronics Technical Discussion 02-20-2021, 01:44 PM
Replies: 11
Views: 193
Posted By redwire
Re: Help Identify this Fuse

Post a picture of the part that is the "fuse LBV160". Without the bblluuurrr.

It seems to be a custom British Standard multimeter made by Caltek HK.
I call a polyfuse a PTC, the big yellow...
Forum: General Electronics Technical Discussion 02-20-2021, 01:17 AM
Replies: 11
Views: 193
Posted By redwire
Re: Help Identify this Fuse

It doesn't have any fuses, only a yellow PTC to protect the 200mA current range.
Forum: General Electronics Technical Discussion 02-20-2021, 01:02 AM
Replies: 11
Views: 223
Posted By redwire
Re: Whats this ripple?

What you are seeing is called "ringing", like when you tap something resonant like a bell, it oscillates at a frequency while the amplitude fades out.
There are many resonances in electronic...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-18-2021, 02:33 PM
Replies: 9
Views: 426
Posted By redwire
Re: Kitchenaid food processor burnt wire

Gently scrape off the melted plastic from the relay terminal and I would put on a new crimp connector, something not from china where the metal is thin-not copper, plating is crap and the spring is...
Forum: General Electronics Technical Discussion 02-17-2021, 07:50 PM
Replies: 43
Views: 2,498
Posted By redwire
Re: Help identify a Zener?

Chamberlain Liftmaster garage door sensor 14LG372-1B I have not seen you'd have to post some pictures.

The black IR receiver module runs to 5.5V max (plus a diode drop) so the zener needs to be...
Forum: General Electronics Technical Discussion 02-16-2021, 01:44 PM
Replies: 18
Views: 262
Posted By redwire
Re: Valliant boiler board

On the second board I see capacitor C708 bent over, hopefully not mashed. It's by the big filter cap/relay at the edge.

Did you clean the flame rod? Common problem here is boiler controller goes...
Forum: General Electronics Technical Discussion 02-15-2021, 11:16 PM
Replies: 18
Views: 262
Posted By redwire
Re: Valliant boiler board

The board shows water damage, rust on the pcb. Something leaked on it.
I would clean it up with isopropyl alcohol and an old toothbrush, gently.
Forum: Troubleshooting & Designing Networks 02-13-2021, 03:12 PM
Replies: 23
Views: 836
Posted By redwire
Re: Packet loss on LAN...

I've had either the 12V wall-wart caps or the switch's internal electrolytic caps go bad. I'd take a look at them.
A new one is cheap but these things run hot they don't last more than a couple...
Forum: General Electronics Technical Discussion 02-13-2021, 03:07 PM
Replies: 9
Views: 445
Posted By redwire
Re: Magneto-resistor Digital Output Potentiometer

The "digital" sensors are a switch, on/off. The "analog" sensors are a continuous voltage output. I think the Japanese manufacturer got confused which type of sensor you are looking for: not...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-13-2021, 02:36 PM
Replies: 16
Views: 597
Posted By redwire
Re: Identifying THT resistor value + other Qs. [Electric blanket controller repair]

I think there is another bad part that cooks this resistor? Is it for a snubber or capacitive-power? Where is the triac I would check it.

There is a wide variance in the size of power resistors, a...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-09-2021, 05:39 PM
Replies: 12
Views: 687
Posted By redwire
Re: Crucial M4 SSD failure?

I wonder if a MLCC capcitor has shorted? The clicking would be one of the buck-converters trying to power up into a short circuit.

I would try to power up the board and you can measure the power...
Forum: General Electronics Technical Discussion 02-08-2021, 05:40 PM
Replies: 6
Views: 237
Posted By redwire
Re: Does anyone have experience with this ic chip silicon touch PS223

To change the output voltage, it's two things to mod. The Supervisor trip points for OVP/UVP, and the voltage regulation loop.

I think the hardest part is the regulation loop, if it uses a TL431...
Forum: General Electronics Technical Discussion 02-08-2021, 04:26 PM
Replies: 6
Views: 237
Posted By redwire
Re: Does anyone have experience with this ic chip silicon touch PS223

The PS223 +12V rail monitor has stock 13.78V over-voltage and 9.05V under-voltage trip points. Max. spec is 14.5V it depends on how accurate the IC is, it's +/-5%.
Adding a series resistor to VS12A...
Forum: General Electronics Technical Discussion 02-08-2021, 02:41 PM
Replies: 6
Views: 237
Posted By redwire
Re: Does anyone have experience with this ic chip silicon touch PS223

I think there's confusion with the TPS223 touch sensor IC, and this PS223 power monitoring IC.
The PS223 monitors 4 voltages for being hi/lo and 4 currents, for 12Va, 12Vb, 5V, 3.3V rails.
It has...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-08-2021, 12:12 AM
Replies: 12
Views: 687
Posted By redwire
Re: Crucial M4 SSD failure?

I have many problems with USB3 cables breaking off the enclosure pc board.
Try a new cable, they are very fragile. Then look at the connector on the USB enclosure board. Not the SSD drive.
Forum: General Electronics Technical Discussion 02-08-2021, 12:09 AM
Replies: 9
Views: 445
Posted By redwire
Re: Magneto-resistor Digital Output Potentiometer

Wow, life rated 100,000,000 shaft rotations. The original is an analog angle sensor, +-45 degrees (sine).
Since the sensor is Japanese, it's likely all the parts are custom from Japan.
If the...
Forum: Troubleshooting Audio Equipment 02-07-2021, 05:30 PM
Replies: 24
Views: 419
Posted By redwire
Re: D718 & B688 Transistors - Substitutes?

The Technics design looks good, worth restoring. New stuff is so cheap and sounds terrible, hard pressed to use five transistors per channel and overheats.
The FET phono preamp is nice, I would put...
Forum: Troubleshooting Audio Equipment 02-07-2021, 01:52 PM
Replies: 24
Views: 419
Posted By redwire
Re: D718 & B688 Transistors - Substitutes?

I was going to say that seems suspiciously low offset V - is the protection relay clicking in? I would expect 5-50mV at the output and what do you measure on the other side of the 1k resistors?
...
Forum: General Electronics Technical Discussion 02-06-2021, 03:19 PM
Replies: 6
Views: 236
Posted By redwire
Re: Battery Charging Peugot Boxer

The fuse was blown?

I've read there is a red button near the ignition switch to disconnect the battery (-) in the event the vehicle is sitting in storage.
Forum: Troubleshooting Audio Equipment 02-06-2021, 03:15 PM
Replies: 24
Views: 419
Posted By redwire
Re: D718 & B688 Transistors - Substitutes?

You have Q507/Q503 on the heatsink label but schematic says the output transistor pair is Q507/Q509. Q503/Q505 is the driver stage.

I would look for side effects from the O/P transistors shorting....
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