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Search: Posts Made By: cb92
Forum: General Electronics Technical Discussion 08-12-2014, 01:59 PM
Replies: 137
Views: 22,280
Posted By cb92
Re: UPS and inverter questions

The Rooskies have schematics, just Google your item.This is an example, I think it's the 500 Smart UPS.
http://elektrotanya.com/apc_bp500i_ups_sch.pdf/download.html
Forum: Troubleshooting Power Supplies and Power Supply Design 01-21-2012, 04:39 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

The chips are in, and that was the problem. I put a power supply in from E-bay, the one I fixed is a spare, good for testing 5v and 12v stuff. From this exercise I now have an optoisolator tester...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 01-15-2012, 10:28 AM
Replies: 3
Views: 2,296
Posted By cb92
Re: Anatek Peak DCA55 semiconductor analyser

I still have the ad I printed from AnaTek Corporation, john@anatek.mv.com selling the ESR 60 for $179, the LC40 for $159 plus extra for the tweezers, clips, and carry case, and $159 for the DCA55,...
Forum: General Capacitor Questions & Issues 01-15-2012, 10:11 AM
Replies: 37
Views: 6,242
Posted By cb92
Re: Reusing caps

I use a white marker to identify used parts. It's handy to mark polarity and to highlight items in photos.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-13-2012, 12:58 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

Just something else to drive me crazy. Apparently optoisolators come in two sizes, normal and wider. The wider ones won't fit into a chip socket, so I'll modify one* for my tester, and have both...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-08-2012, 07:05 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

Thank goodness for E-bay. I'll get the parts to make my optoisolator tester, too. I've been collecting parts as I go.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-08-2012, 11:40 AM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

D902 passed the out of circuit test.
I lifted the leg of r903 to pin 6, and it has about 80 vdc on it disconnected, 8mv connected. Seems like the chip is pulling the circuit down. I pulled the...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-07-2012, 09:01 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

D902 checked out ok. But r902 has 38v in and 28 v out, and r903 has 28v in but only 8mv out....that goes to pin 6 on the chip, so...maybe that resistor is bad, even though it measures the correct...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-07-2012, 01:04 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

I found that thread, too, makes for good reading. I think I searched the forums first, but did not use the correct term. Lots of good information, I'll do all the tests, sooner or later I will find...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 01-06-2012, 08:26 PM
Replies: 3
Views: 2,296
Posted By cb92
Unhappy Anatek Peak DCA55 semiconductor analyser

Finally got my meter from E-bay for about sixty bucks delivered. Much better than the one hundred fifty or so they wanted originally. Sure am glad I got a deal, 'cause it can't recognize a voltage...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-06-2012, 05:39 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

I just put everything away, going to move it all to my workshop in town. The bench power supply did run the monitor, so it's only the power supply that is bad. I ordered one from e-bay for about 20...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-06-2012, 09:40 AM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

There is 8mv between pin 6&7 on the IC. Same across cap c907.
I try to post the optoisolator test.
I checked e-bay for replacement power supplies, there's plenty from $13 to $25 available. If I can...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-05-2012, 05:27 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

The monitor is a Dell 1800FP. The Koreans sold this monitor to a lot of companies, from what I see. The 47uf cap #c907 is directly connected to the negative (-) leg of the rectifier. The solder track...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-04-2012, 08:45 AM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

I got 165 volts DC across the cap,(same reading on either leg to the + on the rectifier) and the diode and resistor read ok on the board. The IC is ICE2a501. I removed the optoisolator and checked...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-02-2012, 07:15 PM
Replies: 28
Views: 6,541
Posted By cb92
Re: Dell monitor

Thanks a lot, Momaka. I think I see the cap you mention on the schematic. I got Paint.net, will see if it helps, changed the pic to jpeg, will re-post just to see if it's any better.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-01-2012, 06:03 PM
Replies: 28
Views: 6,541
Posted By cb92
Dell monitor

This unit is ten years old, just for practice. I have ac and dc on the ac side of the smps. Nothing on the load side of the smps. There seems to be an optoisolator in the circuit. Is the smps bad or...
Forum: Frequently Asked Questions (No Posting) 01-01-2012, 10:04 AM
Replies: 6
Views: 12,095
Posted By cb92
Re: *****This section is NOT where to start threads asking questions*****

Hey, ratdude747, where is the thread to start threads asking questions? My Hadron Collider is making funny noises...:D

Oh, by the way, happy new year.
Forum: General Electronics Technical Discussion 05-22-2011, 09:33 PM
Replies: 137
Views: 22,280
Posted By cb92
Re: UPS and inverter questions

Welcome, Aquaman and Seng, to the site most likely to help you repair your units. I've looked a lot elsewhere, this is the best.
Nontheless, UPS repair is a real tough one. I have gotten lucky a...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-18-2010, 07:37 PM
Replies: 23
Views: 23,710
Posted By cb92
Re: SmartUPS 700 will not turn on

Concentrating on UPSes, I would like to know what is most likely to fail when the battery fails from age. This is the most likely fault to happen, you would think safeties would be built in, but...
Forum: General Electronics Technical Discussion 04-12-2010, 03:47 PM
Replies: 3
Views: 3,656
Posted By cb92
Re: substitute transistors

Yeah, kc8adu, I thought it was goofy. I asked the guy how long he had been in electronics, he said years, learned it in some school.
I only have these guys and Radio Shack here. As long as I know...
Forum: General Electronics Technical Discussion 04-11-2010, 10:22 PM
Replies: 3
Views: 3,656
Posted By cb92
substitute transistors

I have to make do with what I can get here, need a substitution website. I ordered an nte 999 voltage reference transistor to replace a Fairchild tl 431 regulator. When it never came, the counter...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-07-2010, 12:37 AM
Replies: 9
Views: 8,516
Posted By cb92
Re: Which inexpensive soldering iron (not station)

This is a 25 watt job I put fiberglass on to keep from burning my fingers. My 30 watt Radio Shack one has a broken tip, and they don't carry replacements, and replacements for other irons won't...
Forum: General Capacitor Questions & Issues 02-25-2010, 05:55 PM
Replies: 20
Views: 5,092
Posted By cb92
Re: several beginner questions

I use my iron at the 30 watt setting, 20 is too low. I have a huge iron for really big stuff, lke heatsinks. I find my pistol shaped iron to be hateful. Certainly no good for getting into tight...
Forum: General Capacitor Questions & Issues 02-24-2010, 01:47 PM
Replies: 20
Views: 5,092
Posted By cb92
Talking Re: several beginner questions

I'm a noobie too, and I'll tell ya, it's a struggle. I open up this psu in a Compaq that doesn't want to run anymore, and I see a forest of caps! Lord, I start pulling and checking, FINALLY find the...
Forum: Announcements & Related News 01-02-2010, 10:28 PM
Replies: 22,069
Views: 1,307,898
Posted By cb92
Re: New Members - please post your introductions here

Yeah, me too. Sometimes we just aren't paying attention, sorry Topcat. I've been here a while, too, really enjoy the site, good advice here.
Like the others, I'm a jack of all trades, master of...
Showing results 1 to 25 of 29

 
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