Hi,
PSU has tickling sound problem. I read that changing the regulator IC will solve the problem. So I change the KA3842B Controller IC with UC3842B IC (On Semiconductor). Tickling sound disappears but PSU could not power on the Point of Sales terminal; just managed to flicker on the terminal display only.
Should I use only the original KA3842B Controller IC?
Thanks for your advise.
Seventh Prince
"=?utf-8?B?U2V2ZW50aFByaW5jZeS4g+WwkeeItw==?=" wrote in news: snipped-for-privacy@o13g2000cwo.googlegroups.com:
It's probably bad electrolytic caps,where their ESR increased,a very common failure of switcher power supplies.
-- Jim Yanik jyanik at kua.net
PSU (Portland State University) reports they have many tickling sounds. All the way from grunts, guffaws, and screeches, to high-pitched shrieks and gasps.
See the SMPS repair guide at the sites below.
--- sam | Sci.Electronics.Repair FAQ:
Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.
That was almost funny.. :| ;) probaly funnier if you associate psu with portland state. not power supply like me.
Sam, How do I recognise which caps are bad? Thanks
=?UTF-8?B?5LiD5bCR54i3U2V2ZW50aCBQcmluY2U=?= wrote in news:43520143$1 snipped-for-privacy@news.tm.net.my:
If you don't have an ESR meter like the Dick Smith Electronics meter(very affordable,very good),then you're best bet is to replace all the electrolytics.
Also look for discolored,swollen,or bulging electrolytic caps;indications they are dissipating excessive heat.
-- Jim Yanik jyanik at kua.net
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.