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Search: Posts Made By: Longbow
Forum: Other Devices with Bad Capacitors 04-21-2018, 09:46 AM
Replies: 230
Views: 109,806
Posted By Longbow
Re: Dim Clock LCD on Jenn-Air wall oven

While replacing caps on the display board used to be a great idea, keep in mind that even with a working display pcb, the VFD displays wear out and dim with age. There is nothing you can do other...
Forum: General Electronics Technical Discussion 04-21-2018, 09:31 AM
Replies: 17
Views: 370
Posted By Longbow
Arrow Re: LM317 constant current question

Commendable
It is typical to find most technical literature devoted to looking at the world from a voltage perspective. For some reason people have no problem with the idea that the ideal voltage...
Forum: General Electronics Technical Discussion 04-21-2018, 08:50 AM
Replies: 20
Views: 504
Posted By Longbow
Re: Questions about leds in series.

Of course you can run them in a series string. Prove it to yourself by putting them together on a bread board. I don't know why anyone would ask for trouble in this way, but it CAN be done if the...
Forum: General Electronics Technical Discussion 04-21-2018, 08:36 AM
Replies: 55
Views: 1,136
Posted By Longbow
Arrow Re: Help with LED brake lights

Key point: unknown manufacturer, item purchased on auction site.
From personal experience, there is a wide variation in the quality of discreet led's as well as with automotive LED modules. Some...
Forum: General Electronics Technical Discussion 04-18-2018, 07:27 AM
Replies: 55
Views: 1,136
Posted By Longbow
Re: Help with LED brake lights

Reading the schematic (with difficulty), refer to page 3-16. #160 appears to be the brake switch, which then connects to a computer unit, #118. The stop light is #639, appearing on page 3-45. If...
Forum: General Electronics Technical Discussion 04-18-2018, 06:44 AM
Replies: 55
Views: 1,136
Posted By Longbow
Arrow Re: Help with LED brake lights

Sorry if I find this very funny. I've never had any problems like this, but it is very interesting. I'd like to know the brand or the web site that provided the LED unit. I've always had good luck...
Forum: General Electronics Technical Discussion 02-03-2018, 04:29 PM
Replies: 8
Views: 395
Posted By Longbow
Re: Auto engine management ecu

We are positively inconvenienced by a question of such generality as yours. If you have a particular vehicle, or a particular fault your are tracing, perhaps there could be some intelligent...
Forum: Other Devices with Bad Capacitors 01-30-2018, 09:26 AM
Replies: 48
Views: 1,681
Posted By Longbow
Re: Oven broiler stuck on!!!!

The broiler element draws high and constant current. It is likely that the broiler relay needs to be replaced. I imagine that the relay contacts welded themselves together and it will happen again...
Forum: Troubleshooting Audio Equipment 01-30-2018, 09:21 AM
Replies: 7
Views: 414
Posted By Longbow
Re: Sencor SCD 3554 MR - no backlight

The open circuit voltage across the faulty LED will not be the same as when that LED gets replaced. Order a few SMD parts of the proper size, and they will most likely work fine. There are already...
Forum: General Electronics Technical Discussion 01-27-2018, 07:00 PM
Replies: 7
Views: 311
Posted By Longbow
Re: Help me identify this little bugger (schotty diode?)

There are zillions of these BAT54 dual diodes in SMD boards of many types. I will guess that it is simpler to use a package that is identical to most of the other parts, to make it easier for the...
Forum: Other Devices with Bad Capacitors 01-20-2018, 11:49 AM
Replies: 22
Views: 1,047
Posted By Longbow
Re: Netgear R6300v2

The link to the NVRAM chip tells you which pins do what. These things don't have a unique reset pin, but are reset via serial data commands. Don't worry with the chip, unless you have found that...
Forum: Troubleshooting Audio Equipment 01-20-2018, 11:36 AM
Replies: 9
Views: 350
Posted By Longbow
Re: Pioneer XR-A670 cd changer mechanical issue

Replace the rubber mounts as suggested. Spraying them won't do anything.
Forum: Troubleshooting Audio Equipment 01-20-2018, 11:33 AM
Replies: 5
Views: 527
Posted By Longbow
Re: Sony mds JA 30 ES minidisc

Since the symptom can be reproduced, just get out your heat gun and find out what part of the unit is sensitive to heat. Or wait for failure and selectively freeze various things. Better than...
Forum: General Electronics Technical Discussion 01-15-2018, 12:10 PM
Replies: 25
Views: 762
Posted By Longbow
Re: Overvoltage protection design ideas

There IS an ideal solution to your problem, as described. A box of units cobbled together is not going to require high level engineering for you to get into operation. In fact, at this point you...
Forum: Troubleshooting Audio Equipment 01-13-2018, 06:25 PM
Replies: 4
Views: 314
Posted By Longbow
Re: Marantz Tuner issues

Unlikely that you would have power supply hum on one higher station but none on any lower stations. Does your unit have the hum problem with a simple FM dipole? I'd say the next troubleshooting...
Forum: General Electronics Technical Discussion 01-12-2018, 06:31 PM
Replies: 3
Views: 266
Posted By Longbow
Re: Scr / thyristers

That particular spec means that the device has to withstand at least 200v. reverse. But there are other important specs with thyristors, especially the turn-on voltage and turn-on pulse width...
Forum: Troubleshooting Audio Equipment 01-12-2018, 08:02 AM
Replies: 3
Views: 427
Posted By Longbow
Re: YAMAHA RX-V775 Strange Problem

That figures. That's why the symptoms always change from day to day. There is no way to fix it, unless you can get a spare board from another unit.
Forum: General Electronics Technical Discussion 01-12-2018, 07:55 AM
Replies: 50
Views: 1,408
Posted By Longbow
Re: EEPROM function confusion

Freezing the chip is just one method of stressing it in hopes that an internal part or connection will re-connect and start working temporarily. Heating it up, or heating individual pins might also...
Forum: Troubleshooting Audio Equipment 01-09-2018, 08:45 PM
Replies: 3
Views: 427
Posted By Longbow
Re: YAMAHA RX-V775 Strange Problem

After flashing the firmware you should get a message saying that the flash is successful. If so, you don't have a firmware problem and it won't be fixed by doing another update. First, do the...
Forum: General Electronics Technical Discussion 01-09-2018, 08:36 PM
Replies: 14
Views: 491
Posted By Longbow
Re: Furnance Fan Timer Control Board ST9103A1002

One relay operating the coil of another relay doesn't sound like an overload situation. Interesting to check the schematic to see what is going on. On the other hand, the coil of heavy duty 120VAC...
Forum: Other Devices with Bad Capacitors 01-07-2018, 02:15 PM
Replies: 22
Views: 1,047
Posted By Longbow
Re: Netgear R6300v2

Was any testing done after the successful flashes? I would need to know if the unit works fine in place doing routing. If it does work, but does not survive a power-off cycle then you have a couple...
Forum: General Electronics Technical Discussion 01-04-2018, 08:47 AM
Replies: 14
Views: 491
Posted By Longbow
Arrow Re: Furnance Fan Timer Control Board ST9103A1002

I don't see any mention of how the problem was fixed, or at what point the system started working. Can you give us any information? You replaced the relays in your first post, which would be the...
Forum: Troubleshooting Audio Equipment 12-16-2017, 03:54 PM
Replies: 30
Views: 4,350
Posted By Longbow
Re: Aiwa MX-Z3300M receiver repair, no display, capacitors in series

Well, I hardly think this kind of technical fanfare addresses the issue at all. It has already been determined what this circuit is and how it works. Spice models, in my personal opinion, belong in...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-06-2017, 08:22 AM
Replies: 22
Views: 803
Posted By Longbow
Re: Ault Power Supply 3 volts @ 5 amps one second on one off

Technically you are right, but in this simple case the small variation in Vf is irrelevant.not if the light is composed of an array of LED's, which it is according to the descriptions so far.Anything...
Forum: General Electronics Technical Discussion 12-06-2017, 07:56 AM
Replies: 8
Views: 311
Posted By Longbow
Re: Standby regulator Switch on a VCR P.S project?

You will need the Sony schematic. It is possible that you can identify the wakeup line from the system control micro to the supply. If that line is hard wired to be active, the supply should stay...
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